bluuebunny/crossref_metadata_2025 huggingface dataset:
Plantar Flexor Function in Adults with and without Prader–Willi Syndrome
Authors: PAMUKOFF DEREK N. , HOLMES SKYLAR C. , SHUMSKI ERIC J. , GARCIA STEVEN A. , RUBIN DANIELA A.
Published: April 2020

Purpose

Prader–Willi Syndrome (PWS) is a form of congenital obesity characterized by excessive body fat, hypotonia, muscle weakness, and physical/cognitive disability. However, the sources of muscle dysfunction and their contribution to mobility are unclear. The purposes of this study were to 1) compare plantar flexor function between adults with and without PWS; and 2) to examine the relationship between plantar flexor function and gait speed in adults with PWS.

Methods

Participants included 10 adults with PWS, 10 adults without PWS and with obesity, and 10 adults without PWS and without obesity (matched on age and sex). Plantar flexor function was assessed using isokinetic dynamometry (peak torque [PT], early/late rate of torque development [RTD]), Hoffman reflex (H/M ratio), ultrasound imaging (cross-sectional area [CSA], echo intensity, pennation angle, and fascicle length), and peak propulsive force and plantar flexor moment during gait. Outcomes were compared between groups using one-way MANOVA. Associations between plantar flexor outcomes and gait speed were assessed using Pearson correlation in the PWS group.

Results

Adults with PWS had lower absolute and normalized early RTD, and lower H/M ratio than controls with and without obesity; lower absolute PT and late RTD than controls with obesity (all P < 0.05). Cross-sectional area, propulsive force, and plantarflexor moment were lower, and echo intensity was higher, in adults with PWS compared with controls without obesity (all P < 0.05). Greater absolute PT (r = 0.64), absolute early RTD (r = 0.62), absolute late RTD (r = 0.64), gastrocnemii CSA (r = 0.55), and propulsive force (r = 0.58) were associated with faster gait speed (all P < 0.05).

Conclusions

Adults with PWS have impaired plantar flexor function likely attributable to reduced neuromuscular function and altered muscle morphology, which are associated with slower gait speeds.
Fatigue-related Feedback from Calf Muscles Impairs Knee Extensor Voluntary Activation
Authors: FINN HARRISON T. , KENNEDY DAVID S. , GREEN SIMON , TAYLOR JANET L.
Published: April 2020

Introduction

Fatigue-related group III/IV muscle afferent firing from agonist, antagonist or distal muscles impairs the ability to drive the elbow flexors maximally, that is, reduces voluntary activation. In the lower limb, the effect of feedback from distal muscles on the proximal knee extensors is unknown. Here, we test whether maintained group III/IV afferent feedback from the plantarflexor muscles reduces voluntary activation of the knee extensors.

Methods

On 2 d, voluntary activation of the knee extensors during maximal voluntary contractions (MVCs) was assessed in 12 participants before and after a 3-min fatiguing task of the plantarflexors. On 1 d, an inflatable cuff around the calf occluded blood flow for 2 min immediately postexercise (cuff day). The other day had no occlusion (no-cuff day). Supramaximal stimulation of the femoral nerve elicited superimposed twitches during MVC of the knee extensors and resting twitches 2 to 3 s after relaxation. Pain (0–10 point scale) was reported throughout.

Results

In the 2 min after the 3-min fatiguing plantarflexor task, voluntary activation was 5.3% (SD, 7%) lower on the cuff day than on the no-cuff day (P = 0.045), and MVC force was reduced by 13% (SD, 16%) (P = 0.021). The resting twitch was similar on both days (P = 0.98). Pain rated 4.9 points higher with the cuff inflated (P = 0.001).

Conclusions

Maintained group III/IV afferent feedback from the fatigued plantarflexor muscles reduced maximal force and voluntary activation of the unfatigued knee extensors, suggesting that afferents from the calf act centrally to inhibit the ability to drive the motoneurones of the knee extensors.
Sequential butylphthalide therapy combined with dual antiplatelet therapy in the treatment of acute cerebral infarction
Authors: Wo Xuewen , Han Jinyan , Wang Jiajia , Wang Xinmin , Liu Xiaoying , Wang Zhonggong
Published: April 2020

Objective: To observe the clinical efficacy of sequential butylphthalide therapy combined with dual antiplatelet therapy in the treatment of elderly patients with acute cerebral infarction (ACI).

Methods: One hundred and twenty-two elderly patients with ACI who were admitted to the department of neurology of our hospital at May 2016-August 2018 were selected grouped into a control group and an observation group by random number table method, 61 in each group. On the basis of conventional treatment, the patients in the control group were given dual antiplatelet therapy (aspirin enteric-coated tablets + clopidogrel bisulfate tablets), while the patients in the observation group were given sequential butylphthalide therapy on the basis of the control group. The clinical effects of the two groups were compared after four weeks of treatment, and the changes of National Institutes of Health Stroke Scale (NIHSS), ADL score, plasma 3-mercaptopyruvate sulphurtransferase (3-MST) and Amyloid β42 (Aβ42) levels and the occurrence of adverse reactions during treatment were recorded.

Results: The clinical efficacy of the observation group was better than that of the control group (P<0.05). There was no significant difference in NIHSS and ADL scores between the two groups before treatment (P>0.05). After treatment, the NIHSS and ADL scores of the observation group were better than those of the control group (P<0.05). There was no significant difference in plasma levels of 3-MST and AB42 between the two groups before treatment (P>0.05). The level of plasma 3-MST in the observation group was higher than that in the control group, and the level of plasma Aβ42 was lower than that in the control group (P<0.05). No serious adverse reactions occurred during the treatment period in both groups.

Conclusion: Butylphthalide sequential therapy combined with dual antiplatelet therapy is effective in the treatment of elderly ACI. It can effectively improve the plasma level of 3-MST and decrease the plasma level of Aβ42, which is conducive to improving the living ability and neurological function of patients and has high safety.

doi: https://doi.org/10.12669/pjms.36.4.1831

How to cite this:Wo X, Han J, Wang J, Wang X, Liu X, Wang Z. Sequential butylphthalide therapy combined with dual antiplatelet therapy in the treatment of acute cerebral infarction. Pak J Med Sci. 2020;36(4):615-620. doi: https://doi.org/10.12669/pjms.36.4.1831

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Investigating the structure of the low-lying states in 140Ba
Authors: Khaliel Ahmed , Mertzimekis T. J. , Bracco A. , Crespi F. C.L. , Florea N. , Papaioannou D. , Zagoraios G. , Stan L. , Turturica A. , Marginean N.
Published: April 2020

The neutron-rich 144,146Ba isotopes have been studied recently in terms of their experimental B(E3) values [1,2]. Although featuring large uncertainties, the results were found to be significantly larger than any theoretical calculation. Similar questions exist for the slightly lighter isotope 140Ba, which is particularly interesting since it is located at the onset of octupole correlations. The lifetimes of the lower-lying states are completely unknown, with the sole exception of the first 2+ state [3].In this work, we report on the outcome of a short test run, attempting to populate the states of interest using the 138Ba(18O,16O)140Ba reaction. The experiment was carried out at IFIN-HH using a specially manufactured natBa target sandwiched between two Au layers. This was considered imperative due to Barium's quick oxidation in air. Four beam energies (61,63,65,67 MeV) below the Coulomb barrier have been tested. The subsequent decay was measured using the Bucharest ROSPHERE array, consisting of 15 Ge detectors and 10 LaBr­3(Ce) scintillators.The preliminary results from the test run report on the level population strengths and the limits in lifetime measurements, which are expected to provide new information on the structural effects in neutron-rich barium isotopes, especially regarding quadrupole and octupole degrees of freedom. The _ndings are also expected to act as stringent tests to theoretical modeling in this mass regime.
Investigation of Photon Attenuation Properties of CR-39 Lens
Authors: Eke Canel , Yildirim A.
Published: April 2020

The purpose of this study is to investigate photon attenuation parameters of Colombia Resin-39 (CR-39) lens, which are linear attenuation coefficient (LAC), mass attenuation coefficient (MAC), half value layer (HVL), tenth value layer (TVL), mean free path (MFP), effective atomic number (Zeff) and effective electron density (Neff). MACs were determined theoretically and with simulation in the energy range from 0.01 to 105 MeV. Also, obtained MACs of CR-39 lens were compared with MACs of pure aluminum and lead. Theoretically obtained Zeff values were compared with Zeff results obtained by the computer software.The results of this study are; a) the theoretically obtained MACs values are in agreement with MACs  obtained results from simulation software, b) the theoretically obtained Zeff values are in agreement with Zeff obtained by the computer software c) the MACs of CR-39 lens are much lower than MACs of pure lead whereas there is not too much differences between MACs of CR-39 and pure aluminium d) the HVLs, TVLs and MFPs rise with increasing photon energy while the LACs and  MACs reduce with increasing photon energy.
Production Cross–Section Calculations of 62Cu via Charged Particles Induced Reactions
Authors: Sekerci Mert , Özdoğan H.
Published: April 2020

The utilization of radioisotopes has been increasing proportionally with the scientific and industrial developments. Among many known and used examples of them, 62Cu has a wide usage due to its suitability for many specific requirements such as in medical applications. By considering the importance of radioisotopes and especially 62Cu, in this study, the theoretical calculations of cross–section values for 62Cu via 59Co(α,n)62Cu, 61Ni(d,n)62Cu, 62Ni(d,2n)62Cu and 62Ni(p,n)62Cu reactions were carried out by employing three phenomenological level density models via TALYS 1.9 code. Obtained results were compared with the available experimental data from Experimental Nuclear Reaction Data (EXFOR) Library by graphically and mathematically.
An upgrade of the UoA nuclear electromagnetic moments database
Authors: Pelonis Stefanos , Mertzimekis Theo J
Published: April 2020

A web–based database of nuclear electromagnetic moments data has been created and hosted online at the University of Athens since 2012. In this work, we report on an update which has focused on syncing spectroscopic information, electric quadrupole and magnetic dipole moments with the ENSDF database and literature values. A new feature is the incorporation of nuclear charge radii values obtained after 2015. Additionally, instructions of how to use the database, alongside with annonations and abbreviations, are presented.
ON A RESPONSE FUNCTION AND TWO-BODY DENSITY MATRIX OF NUCLEAR MATTER
Authors: Mavrommatis E. , Petraki M. , Clark J. W. , Kwong N. H.
Published: April 2020

We present a summary of on-going calculations that address the static and dynamic structure of nuclear matter. Specific projects include (i) evaluation of the density-density response function and corresponding dynamic structure factor, based on the correlated random-phase approximation (CRPA_I) and generalizations of this method, and (ii) low-order variational calculation of the reduced two-body density matrix and corresponding generalized momentum distribution. The numerical applications involve the model interaction V2.
SYMMETRIES IN ODD-MASS NUCLEI
Authors: Van Isacker P.
Published: April 2020

A general review is given of applications  of algebraic techniques to odd-mass nuclei in the framework of the interacting boson-fermion model. The discussion focuses on the symmetry aspect of the model: the concepts of symmetry and dynamical symmetry are illustrated by way of elementary examples. The unified treatment of even-even and odd-mass nuclei (supersym- metry) is introduced by inspecting the action of 'super'generators creating a boson and annihilating a fermion (or vice versa). These ideas are illustrated with some examples. The talk is concludes with a brief summary.
QUANTUM ALGEBRAIC SYMMETRIES IN NUCLEAR AND MOLECULAR PHYSICS
Authors: Bonatsos Dennis , Argyres E. N. , Drenska S. B. , Raychev P. P. , Roussev R. P. , Smirnov Yu. F. , Faessler Amand
Published: April 2020

The first realizations of quanttun algebraic symmetries in nuclear and molecular spectra are presented. Rotational spectra of even-even nuclei are described by the quantum algebra SUq(2). The two parameter formula given by the algebra is equivalent to an expan- sion in terms of powers of j(j + 1), similar to the expansion given by the Variable Moment of Inertia (VMI) model. The moment of inertia parameter in the two models, as well as the small parameter of the expansion, are found to have very similar numerical values. The same formalism is found to give very good results for superdeformed nuclear bands, which are closer to the classical SU(2) limit, as well as for rotational bands of diatomic molecules, in which a partial summation of the Dunham expansion for rotation-vibration spectra is achieved. Vibrational spectra of diatomic molecules can be described by the q-deformed anhannonic oscillator, having the symmetry Uq(2)>Oq(2). An alternative de- scription is obtained in terms of the quantum algebra SUq(1,1). In both cases the energy  formula obtained is equivalent to an expansion in terms of powers of (v+½) , where ν is the vibrational quantum number, while in the classical ST(1,1) case only the first two powers appear. In all cases the improved description of the empirical data is obtained with q being a phase (and not a real number). Further applications of quantum algebraic symmetries in nuclei and molecules are discussed.
RUTHERFORD BACK SCATTERING USING HEAVY ION BEAMS
Authors: Aslanoglou X. , Pilakouta M. , Aloupogiannis P. , Travlos A.
Published: April 2020

N/A
A STUDY OF THE EFFECTS OF 15N ION BEAM ON ORGANIC COMPOUNDS
Authors: Pilakouta M. , Aslanoglou X. , Savidou A. , Paradellis T. , Sideris E.
Published: April 2020

Organic compounds EDTA. EDTA-Na and biological samples Bovine Liver and DNA, were irradiated with 15N ions at the energy of 8.5 MeV and the hydrogen lost during bombarding was monitored via the H(15N,aγ)12C resonance reaction. The hydrogen loss curves were fited using a multi­ple exponential function which indicates different mechanisms with which hydrogen is lost.
COMPETITION BETWEEN LIGHT CLUSTER AND CONSTITUENT MULTINUCLEON EMISSION IN HEAVY-ION REACTIONS
Authors: Xenoulis A. C.
Published: April 2020

Isoproduct competition. i.e. competition between cluster and multlnucleon emission leading to the same residual nucleus, emerges as a general, interesting and useful characteristic of nuclear reactions. Common properties and factors underlying the competition between pn and d as well as between p2n. dn and t evaporation are recognized and discussed. The application of the isoproduct-competition method in the delineation of the mechanisms involved in 7Li-lnduced reactions suggests that an additional mechanism, breakup-fusion, is involved even at very low energies. Finally, the competition associated with alpha emission In the 12C+16O reaction demonstrates a strong contribution from composite 4He emission which cannot be accounted far by either the systematica or standard statistical calculations.
FERMION-BOSON CLASSIFICATION IN MICROCLUSTERS
Authors: Anagnostatos G. S.
Published: April 2020

Mlcroclusters composed of atoms with non delocallzed odd number of valence electrons possess the usual magic numbers for fermions in a central potential and those with an even number of valence electrons possess the magic numbers for bosons coming from the packing of atoms in nested icosahedral or octahedral or tetrahedral shells. On the other hand, mlcroclusters composed of atoms with delocallzed valence electrons, either with an odd or with an even number of electrons, exhibit electronic magic numbers (according to the jelllum model) but also magic numbers coming from the (same, as above) packings of their bosonlc ion cores. Finally, through the present work, an alternative approach to study atomic nuclei as quantum clusters appears possible and promising.
PTOLEMEOS: Α 4π γ-detection system for Nuclear Astrophysics
Authors: Harissopulos S. , Kossionides S. , Galios G. , Paradellis T.
Published: April 2020

A new 4π detector system, called PTOLEMEOS, especially designed for the study of (p,γ) and (α,γ) reactions of astrophysical interest is presented. Technical data of the target system designed for PTOLEMEOS are also given.
Total Cross Section of the n+11B Reaction
Authors: Galios G. , Doukelis G. , Kossionides S. , Paradellis T.
Published: April 2020

The total neutron cross section of 11Β has been measured from 7.2 to 8.4 MeV. The analysis of all data from the 8Li(α,n0)11Β reaction in combination with the total cross section data can determine an upper limit on the stellar reaction rate of the 8Li(a,n)11Β reaction.
On some interesting aspects of heavy-ion reactions studied with 7Li+11B and 9Be+9Be
Authors: Adamides E. , Papadopoulos C. T. , Vlastou R. , Gazis E. N. , Pakou A. A. , Assimakopoulos P. A. , Doukelis G. , Kalfas C. A. , Xenoulis A. C.
Published: April 2020

N/A
The dependence of the nuclear charge form factor on short range correlations and surface fluctuation effects
Authors: Massen S. E. , Garistov V. P. , Grypeos M. E.
Published: April 2020

An investigation is carried out in order to study effects, originating from fluctuations of the nuclear surface, to the elastic charge form factor of light nuclei in which the two-body part of the short range correlation factor is also included through a Jastrow-type correlation function. It is found that if these effects are taken into account in the uncorrected (harmonic oscillator) part of such a form-factor for the 4He, l6O and 40Ca nuclei, the quality of the fitting is improved. In addition, they lead to a drastic change in the asymptotic behaviour of the point-proton form factor which now drops off for large values of the momentum transfer q quite slowly that is as const.•q^-4.
Application of the hypervirial theorem scheme to the potential -D/cosh^2(r/R)
Authors: Liolios T. , Grypeos M.
Published: April 2020

The well known potential -D/cosh^2(r/R)is studied with the aim of obtaining approximate analytic expressions mainly for the energies of the excited states with l≠0. Use is made of the Hypervirial Theorems (HVT) in conjunction with the Hellmann-Feynman Theorem (HFT) which provide a very powerful scheme especially for the treatment of 'Oscillator-like' potentials,as previous studies have shown. The energy eigenvalues are calculated in the form of an expansion, the first terms of which, in many cases, yield very satisfactory results.
Phenomenological nuclear density distributions
Authors: Lalazissis G. A. , Panos C. P.
Published: April 2020

A recently proposed semiphenomenological density distribution for neutrons and protons in nuclei is discussed. This density was derived using the separation energies of the last neutron or proton. A com­parison is made with the symmetrised Fermi density distribution with parameters determined by fitting electron scattering experimental data and with a Fermi density with parameters coming from a recent anal­ysis of pionic atoms. Theoretical expressions for rms radii for neutron, proton and matter distributions are proposed, which give the average trend of the variation of these quantities as functions of Ν, Ζ and A respectively. To facilitate the use of the new density all the parameters needed in a practical application are tabulated for a series of nuclei. Some applications of the new density are also discussed.
The nucleon momentum distribution in light nuclei
Authors: Ypsilantis K. N. , Grypeos M. E.
Published: April 2020

The nucléon momentum distribution in light nuclei is studied by means of a single particle potential model which consists of an attractive harmonic oscillator potential Va=½mω²r² and also of a repulsive one of the form Vr=B/r², Β > 0. The latter simulates to some extend effects which would result if short range correlations were included (e.g. by a Jastrow factor) in a nuclear wave function, having as uncorrelated part a Slater determinant of harmonic oscillator orbitals. The main advantage of this model is that it leads to fairly simple analytic expressions for the momentum distribution of light nuclei and also for the density distributions and the elastic form factors. These expressions are quite useful in obtaining, for example, the asymptotic form of η(k) for large k from which it is seen that the steep decrease of the nucléon momentum distribution observed with the harmonic oscillator model in this region is improved. Numerical results using various least squares fittings are obtained and discussed for a number of nuclei of the 1s, 1p shell.
Vibrational molecular and nuclear spectra in terms of quantum algebras
Authors: Bonatsos Dennis , Daskaloyannis C.
Published: April 2020

A generalized deformed oscillator giving the same spectrum as the Morse potential is con­ structed through the use of quantum algebraic techniques. The model of n coupled anharmonic oscillators of Iachello and Oss, suitable for the description of vibrational spectra of polyatomic molecules, is subsequently written in terms of such generalized deformed oscilla­tors. In addition to clarifying the relation of the model of Iachello and Oss to other models using coupled oscillators for the description of vibrational molecular spectra, the present formalism allows for the construction of a large class of exactly soluble models with no extra computational effort. As an example, the way of including a coupling of the Darling-Dennison type is shown. Nuclear models giving good descriptions of vibrational spectra are reviewed and the need of modifying the SUq(2) model in order to extend its region of applicability towards the vibrational limit is discussed.
Cluster Approach to Atomic Nuclei: Alpha-Chain States in 12C
Authors: Anagnostatos G. S.
Published: April 2020

N/A
Relativistic Expressions for the r.m.s. Radii of the λ-Particle Orbits in Hypernuclei and of the Corresponding Potential Energies
Authors: Papadopoulos G. J. , Koutroulos C. G. , Grypeos M. E.
Published: April 2020

The root mean square radii of the Λ-particle orbits in hypemuclei are calculated semi-analytically for every bound state, using the Dirac equation with a scalar potential Us{r) and the fourth component of a vector potential Uv{f) in the case of rectangular shapes of these potentials with the same radius R.ln addition an analytic expression of the expectation value of the corresponding potential energy operator is derived. For the above quantities, expressions of the energy eigenvalues in terms of the potential parameters are needed and approximate formulae may be used, in certain cases. The variation of these quantities with the mass number is also investigated and numerical calculations are performed.
The influence of state dependent short range correlations on the depletion of the nuclear Fermi sea
Authors: Lalazissis G. A. , Massen S. E. , Panos C. P.
Published: April 2020

The influence of state dependent short range correlations on the occupation numbers of the single particle shell model orbits of the doubly closed shell nuclei 16O and 40Ca is examined. The study shows that the effect of the state dependence of the short range correlations is rather small. The total depletion of the nuclear Fermi sea changes slightly compared with the one calculated by considering state independent short range correlations.
The form factor and the density distribution of the 4He nucleus using the Morse potential
Authors: Ypsilantis K. , Dimitrova S. , Koutroulos C. G. , Grypeos M. E. , Antonov A.
Published: April 2020

The form factor and the density distribution of the He nucleus are calculated approximately using the Morse single-particle potential. The parameters are determined by fitting the theoretical charge form factor to the corresponding experimental data of the elastic electron scattering by 4He, which are extended to large values of the momentum transfer. The corrections due to the center of mass motion (in the fixed center of mass approach) and of the finite proton size have been taken into account. The calculations can be performed partly analytically and the results show a considerable im- provement with respect to those obtained with the oscillator shell model.
Power Deposition Profile and Suprathermal Energy Spectra From Modulated ECRH
Authors: Hartfuss H. J. , Erckmann V. , Kechriniotis A. , Maassberg H. , Romé M. , W7-AS-Team And the
Published: April 2020

N/A
Binding energies of hypernuclei and hypernuclear interactions
Authors: Bodmer A. R. , Murall S. , Usmanis Q. N.
Published: April 2020

In part 1 the effect of nuclear core dynamics cm the binding energies of Λ hy­ pernuclei is discussed in the framework of variational correlated wave functions. In particular, we discuss a new rearrangement energy contribution and its effect on the core polarization. In part 2 we consider the interpretation of the Λ single-particle energy in terms of basic Λ-nuclear interactions using a local density approximation based on a fermi hypernetted chain calculation of the Λ binding to nuclear matter. To account for the data strongly repulsive 3-body AN Ν forces are required. Also in this framework we discuss core polarization for medium and heavier hypernuclei.
Effects of short range correlations on the Ca and O isotopes
Authors: Massen S. E.
Published: April 2020

The effect of short range correlations on the Ca and 0 isotopes has been studied by using an isospin dependence of the harmonic oscillator spacing, hω and of the correlation parameter. The analysis indicates that short range correlations as well as the isospin dependence of the parameters are important to explain the behavior of the differences of the MS charge radii and the differences of the charge densities between the Ca and the Ο isotopes.
The nucleon momentum and density distribution of the 4He nucleus using the Morse potential
Authors: Ypsilantis K. , Dimitrova S. , Koutroulos C. , Grypeos M. , Antonov A.
Published: April 2020

The nucleon momentum and density distribution of the 4He nucleus are calculated by using the Morse single-particle potential. The parameters for the momentum distribution n(fc) are determined by fitting either the charge form factor to the available experimental data of the elastic electron scattering by 4He or the momentum distribution to the corresponding "experimental" values. The calculations can be performed partly analytically and the results show a considerable overall improvement with respect to those obtained with the oscillator shell model. The r.m.s radius of the charge density distribution determined by fitting the charge form factor is in very good agreement with the vaiues obtained by means of model independent analysis.
High spin levels in 119Te
Authors: Papadopoulos C. T. , Et al. -
Published: April 2020

High spin levels in 119Te have been populated following the 96Zr(30Si,α3n)119Te reaction at a beam energy of 135 MeV. The subsequent deexcitation was studied using γ-ray spectroscopic methods. New levels and several spin and parity assignments up to Jπ=55/2- were established. The decay scheme is characterized by single particle excitations. For the 39/2- level the fully aligned v(h11/2)^3 π(g7/2)^2 configuration is proposed, while the 55/2- level could be associated with the π(d5/2)^2 ν(h11/2)^5(g7/2)^-2  configuration.
High Spin Structure of 122Xe
Authors: Serris M. , Et al. -
Published: April 2020

High spin states in the isotope 122Xe  were populated using the reaction 96Zn(30Si,2n)122Xe at a beam energy of 135 MeV. The subsequent γ-ray deexcitation was studied using γ-ray spectroscopic methods. The analysis of γ-γ coincidences has revealed two new structures of competing dipole and quadrupole transitions. The highest states of a positive parity band provide characteristics consistent with an approach to band termination.
Calibration and Monte-Carlo Simulation of the Detection System PTOLEMEOS
Authors: Spyrou K. , Chronidou C. , Harissopulos S. , Kossionides E. , Paradellis T.
Published: April 2020

Monte-Carlo simulation and efficiency calibration of the 4π Nal γ-ray detection system PTOLEMEOS is presented. This system is dedicated to the study of nuclear reactions of astrophysical interest. The simulation is evaluated with experimental data.
19F(p,αγ)16O: Test Reaction for the Detection System PTOLEMEOS
Authors: Chronidou C. , Spyrou K. , Harissopulos S. , Kossionides E. , Paradellis T.
Published: April 2020

The reaction 19F(p,αγ)16O has been studied over the energy range Ep=850-916 keV. The excitation function has been measured and the total cross section for the resonance at Ep = 872.11 keV has been deduced. By comparison of the deduced value of σR with previous ones, a test and/or a calibration of the results of simulation programs for the efficiency of our detection system can be extracted.
Double-, energy-, angle- differential and total yield cross section data of 58Ni(n,a)55Fe reaction
Authors: Tsabaris C. , Vlastou R. , Papadopoulos C. T. , Kalfas C. A. , Wattecamps E. , Rollin G.
Published: April 2020

The double-, energy-, angle- differential cross section data, and the total yield of 58Ni(n,α)55Fe reaction is investigated in the neutron energy range between 2 and 9 MeV. The measurements were performed with the prompt detection method, detecting the alpha particles of the reaction with a multitelescope consisted of five ΔΕ-ΔΕ-Ε telescopes, placed at angles 14, 51, 79, 109 and 141 degrees relative to the neutron beam direction. The normalisation to the absolute units was made using the known total yield of the reference reactions 27Al(n,α)24Na and 58N(n,p)58Co. The cross section measurements were compared with previous measurements and with theoretical calculations performed with the STAPRE-H [1-4] code.
Quasi-Exactly Soluble Potentials and Deformed Oscillators
Authors: Bonatsos Dennis , Daskaloyannis C. , Mavrommatis H. A.
Published: April 2020

It is proved that quasi-exactly soluble potentials corresponding to an oscillator with harmonic, quartic and sextic terms, for which the n+1 lowest levels of a given parity can be determined exactly, may be approximated by WKB equivalent poten- tials corresponding to deformed anharmonic oscillators of SUq(1,1) symmetry, which have been used for the description of vibrational spectra of diatomic molecules. This connection allows for the immediate approximate determination of the levels of the same parity lying above the fewest n+1 known levels, as well as of all levels of the opposite parity. Such connections are not possible in the cases of the q-deformed oscillator, the Q-deformed oscillator, and the modified Pöschl-Teller potential with SU(1,1) symmetry.
The oscillator spacing of nuclei as function of Ν and Ζ
Authors: Lalazissis G. A. , Panos C. P.
Published: April 2020

New improved expressions for the harmonic oscillator energy level spacing Κω as function of Ν and Ζ are derived. The isospin dependence is introduced by using new expressions for the mean square radius of nuclei, which fit the experimental mean square radii and the isotopie shifts of even-even nuclei much better than other frequently used relations. The effect of the neutron excess an hω is studied. Very accurate approximate asymptotic formulae for Ηω are also derived, which are suitable for practical use.
Radiation damage of thin films of YBa2Cu3O7 superconductors
Authors: Vlastou R. , Gazis E. N. , Papadopoulos C. T. , Liarokapis E. , Palles D. , Kossionides S. , Pilakouta M. , Assmann W. , Huber H.
Published: April 2020

The effect of ion-beam irradiation of YBa2Cu3O7 superconductors has been studied by Raman spectroscopy. The ion beams 4He, 16O and 127I have been used eat energies 4, 25 and 200 MeV, respectively, in an attempt to investigate the radi- ation damage with respect to the mass of the bombarding ions, further, different doses of irradiation have been tried for each ion beam in order to investigate at which critical dose the phase transition from crystalline to amorphous and the loss of superconductivity occur.
Polarized electrons at NIKHEF
Authors: Papadakis N. H. , Et al. -
Published: April 2020

A design for producing a beam of longitudinally polarized electrons stored in the AmPS ring has been made by a collaboration between NIKHEF, the Budker Institute for Nuclear Physics (BINP) and the Institute of Semiconductor Physics (ISP) from Novosibirsk. The polarized electrons are produced by illuminating a photoemissive cathode with circularly polarized light. A 100 keV electron beam with a peak current up to 40 mA and a pulse length up to 4 μσ is extracted from the cathode at a maximum repetition rate of 2 Hz.
Is "friction" responsible for the reduction of fusion rates far below the Coulomb barrier?
Authors: Karataglidis S. , Amos K. , Giraud B. G. , Robson B. A.
Published: April 2020

Observed rates of the fusion of interacting heavy ions well below the Coulomb barrier are considerably lower than estimates obtained from penetration factors. An interpretation of this discrepancy has been in terms of tunnelling in semiclassical models, with the observed depletion being taken as evidence of a "friction" under the barrier. An extension of that approach is to consider tunnellin in fully quantal models. We consider tunnelling in one-dimensional models to investigate possible sources for such a friction. Under certain conditions, we find that tunnelling may be enhanced or diminished by up to 50%, which finds analogy with observation, without the invocation of a friction under the barrier.
Appied Nuclear Physics-Advanced Ion Beam Materials Analysis at small Accelerators
Authors: Grötzschel R. , Kreissig U. , Neelmeijer Ch.
Published: April 2020

The ossendorf Ion Beam Laboratory has been developed to an international large scale user facility in the field of ion beam physics and ion beam materials research. The laboratory operates a large number of modern experimental equipment at three MeV accelerators, three implanters, an ECR source and a FIB which together pro- vide almost all ions species in a wide energy range from a few hundred eV to a few ten MeV. Also IBAD and PHI devices were installed for various purposes. The re- search stations at the accelerators are supplemented by complementary techniques like TEM, SEM, AUGER, AFM etc., all contributing useful information to thin film investigations. In this paper a short overview of the laboratory is given and a few recent experiments and their results are shown. Rutherford Backscattering Spec- trometry ( RBS) and Elastic Recoil Detection Analysis (ERDA) are well established techniques for quantitative thin film. The advantage of these methods consists in the simple physics they are basing on, namely the stopping of energetic ions in matter and the binary scattering of at the Coulomb potential of atomic nuclei. The increasing importance of ultra-thin layers for novel technologies demands quantita- tive analysis techniques with a depth resolution of atomic monolayers, which can be obtained for RBS and ERDA by magnetic spectrometers only. The magnetic spec- trometers we have installed at the 3 MV Tandetron and at the 5 MV tandem are described , recent applications are shown and a few problems to achieve high depth resolution will be discussed. Heavy ion detectors as Bragg IC, dE-Erest-telescopes and ToF spectrometers, developed for nuclear physics experiments, are now applied for ERDA, providing an efficient analysis of thin films containing light elements. The lateral position resolution of such detectors enables kinematic corrections and allows large solid angles. Thus by ERDA in situ studies during surface modification processes are possible like in the case of the nitridation of aluminum and stainless steel. At the external beam mainly objects of fine arts or of historical value are analysed. It will be shown, how the complementary application of PIXE, RBS and PIGE can help to detect the beginning corrosion of mediaeval glass objects.
Study of 6Li exclusive breakup on 28Si target at 13 MeV
Authors: Patronis N. , Et al. -
Published: April 2020

We have undertaken the study of the 6Li breakup on a 28Si target near the Coulomb barrier through an angular distribution measurement, a's were recorded in coincidence with deuterons in order to determine exclusively the breakup of lithium. Preliminary results are analysed and are discussed, in a discretized coupled channel framework (CDCC).
Screened alpha decay in Dense Astrophysical Plasmas and Superstrong Magnetic Fields
Authors: Liolios Th. E.
Published: April 2020

This paper shows that ultrastrong magnetic fields (such as those of magnetars) and dense astrophysical plasmas can reduce the half life of alpha decaying nuclei by many orders of magnitude. In such environments the conventional Geiger-Nuttall law is modifed so that all relevant half lives are shifted to dramatically lower values.
Measurement of the 241Am(n,2n) Reaction Cross Section, by the Activation Method
Authors: Perdikakis G. , Et al. -
Published: April 2020

The measurement of the cross section of the reaction 241Am(n,2n)240Am, has been performed, for the first time at neutron energies of 8.8, 9.6, 10.6 and 11.4 MeV, by the activation method. The monoenergetic neutron beam was produced at the 5.5MV TANDEM accelerator of NCSR "Demokritos", using the H{d,n) He reaction. During the 5-day long irradiation, the neutron flux was monitored by a BF3, counter. The neutron yield as well as the beam current, were recorded in 100 sec intervals by two multiscaling units. The radioactive target consisted of a 37GBq 241Am source enclosed in a Pb container. A natural Au foil, 27Al foil and a 93Nb foil were used as reference materials for the neutron flux determination. The activity of the irradiated targets, was measured off-line by a 56% relative efficiency, HPGe detector. The first preliminary results are presented and compared with evaluated libraries and existing data.
Searching for a Global alpha-nucleus Potential for Astrophysical Applications
Authors: Spyrou A. , Lagoyannis A. , Zarkadas Ch. , Harissopulos S. , Becker H.-W. , Rolfs C. , Demetriou P.
Published: April 2020

This contribution reports on a systematic investigation of in-beam cross-section measurements of (α,γ) reactions, carried out using a 4π calorimeter. The results are compared to the predictions of the Hauser-Feshbach (HF) theory. This com­ parison puts some constraints on the relevant nuclear properties entering the HF calculations.
Radioactive Contamination due to 241Am Lightning Rod Failure
Authors: Karfopoulos K. L. , Papadakos G. N. , Karangelos D. J. , Rouni P. K. , Petropoulos N. P. , Anagnostakis M. J. , Hinis E. P. , Simopoulos S. E.
Published: April 2020

It is estimated that until 1978 about 200000 lightning conductor rods with -a emitting sources attached to their end were installed worldwide. The sources were supposed to increase the lighting collection efficiency of these rods through the ionization of the surrounding air. Nevertheless, this improvement has never been established conclusively. Such devices are, in most cases, not accessible by the pub- lic; therefore, the dose to the population is considered insignificant. However, the possibility of radioactive material leakage, due to the source attachment failure, and the subsequent contamination of the surroundings that could lead to possible health risk of the public cannot be excluded. In this work, the case of 241Am contamination due to a lightning rod conductor failure is investigated. This contamination was accidentally detected on the surface soil around a laboratory building in the National Technical University of Athens Campus, during a routine in-situ gamma-ray measurement campaign that took place in 2003. A detailed survey revealed that this 241Am contamination was due to the leakage from two lightning rods on the building roof. Consequently the rods were removed from the building and the contamination pattern on the roof and on the surface soil around the building was examined in detail. From the results obtained so far it may be concluded that there exists well localized contamination on the roof and also around the building. It was established that the pathway through which contamination reached the ground was  the rainwater drainage system of the building. The gamma ray dose rate due to 241Am contamination found on the roof and on the surface soil is low compared to that due to its natural radioactivity and does not seem to pose any health risk to the people working in the building or to the public.
Realistic Calculations for Cold Dark Matter Detection Rates
Authors: Kosmas T. S. , Kortelainen M. , Suhonen J. , Toivanen J.
Published: April 2020

The scattering of the cold dark matter (CDM) candidate LSP (Lightest Supersymmetric Particle) off nuclei is investigated. We focus on the nuclear-structure aspects of the LSP-nucleus scattering problem and computed the associated event rates as well as the annual modulation signals for the 23Na, 71Ga, 73Ge and 127I CDM detectors by using the nuclear shell model in realistic model spaces and exploiting microscopic effective two-body interactions. Large-scale computations had to be performed in order to achieve convergence of the results. The relevance of the spin-dependent and coherent channels for the event rates is discussed, from both the nuclear structure and the SUSY-model viewpoints.
Charge Distributions in Nucleons Able to Create the Nuclear Structure
Authors: Kaliambos L. A.
Published: April 2020

Considerable charge distributions in nucléons as multiples of the fractional charges 2e/3 and -e/3 are determined after a careful analysis of the magnetic moments and the results of the deep inelastic scattering. In fact nucleons have fairly large magnetic moments which imply charge distributions of 8e/3 and -8e/3 along the peripheries of proton and neutron respectively. According to the deep inelastic scattering the corresponding charges of -5e/3 and 8e/3 are limited at the centers of the above nucleons. Basic equations derived from such distributed charges lead to the orientation of spins of nucleons and give strong and short ranged forces like the dipole-dipole interactions leading also to the well known binding energy of the deuteron which operates in radial direction with S=1. This operation due to the basic electromagnetic interaction of the opposite charges along the peripheries is in contrast to the Pauli principle. According to these fundamental interactions, p-p and n-n systems repel and only the p-n bonds form rectangles and closely packed parallelepipeds for the structure of nuclei providing an excellent description of nuclear properties.
One and Two Proton Separation Energies from Nuclear Mass Systematics using Neural Networks
Authors: Athanassopoulos S. , Mavrommatis E. , Gernoth K. A. , Clark J. W.
Published: April 2020

We deal with the systematics of one and two proton separation energies as predicted by our latest global model for the masses of nuclides developed with the use of neural networks. Among others, such systematics is useful as input to the astrophysical rp-process and to the one and two proton radioactive studies. Our results are compared with the experimental separation energies referred to in the 2003 Atomic Mass Evaluation and with those evaluated from theoretical models for the masses of nuclides, like the FRDM of Möller et al. and the HFB2 of Pearson et al. We focus in particular on the proton separation energies for nuclides that are involved in the rp-process (29<Z<40) but they have not yet been studied experimentally.
Nuclear Symmetry Energy Effects on the Bulk Properties of Neutron-rich Finite Nuclei
Authors: Divaris Manolis , Moustakidis Charalampos
Published: April 2020

We systematically study the effect of the nuclear symmetry energy in the basic properties of finite, neutron-rich, heavy nuclei where symmetry energy plays a dominant role. We employ a variational method, in the framework of the Thomas-Fermi approximation, to study the effect of the symmetry energy on the neutron skin thickness and symmetry energy coefficients of various nuclei. The isospin asymmetry function a(r) is directly related to the symmetry energy as a consequence of the variational principle. In addition to this, the Coulomb interaction is included in a self-consistent way. The energy density of the asymmetric nuclear matter that is used, has its origins in a momentum-dependent interaction.
Characterization of the Canberra BE5030 Broad Energy High Purity Germanium Detector by means of the GEANT4 Monte Carlo simulation package
Authors: Georgali Efstathia , Et al. ...
Published: April 2020

The accurate determination of the efficiency of HPGe detectors is a challenging procedure due to possible self-attenuation phenomenaand/or coincidence summing effects. Both of these phenomena become important when close detection geometries and extended samples are considered. To deal with these features the simulation of HPGe detectors is used so as to calculate the corresponding correction factors, especially for those cases where low energy γ-ray are considered. Through the present work the Canberra BE5030 Broad Energy HPGe detector of the Enviromental Radioactivity Monitoring Department of Greek Atomic Energy Comission was simulated through the GEANT4 toolkit. Experimental efficiency and counting rate data were compared with the simulation results for different geometries of the detector so as to idetify the one for which the experimental data are better reproduced.
Proton irradiation and resistivity recovery in stages I & II of pure and carbon-doped Fe
Authors: Theodorou Andreas , Syskaki M. , Kotsina Z. , Axiotis M. , Apostolopoulos G.
Published: April 2020

Pure and C-doped Fe specimens were irradiated with 5 MeV protons at cryogenic temperature at the NCSR-"Demokritos" TANDEM accelerator in order to investigate the interactions between carbon atoms and radiation defects. During the subsequent post-irradiation isochronal annealing up to 180 K the defects start to migrate and interact either mutually or with the C impurities. The defect evolution is observed by in-situ electrical resistivity recovery measurements. Comparison of results from pure and C-doped Fe specimens reveals the effect of C solute atoms on the defect kinetics.
natMg(p,p0) differential cross-section measurement relevant to the EBS technique
Authors: Alvanou Eleni , Lagoyannis Anastasios , Axiotis Michael , Bligoura Natalia , Harissopulos Sotirios , Kokkoris Michael - , Maragkos Fotis , Ntemou Eleni , Preketes-Sigalas Kostas
Published: April 2020

In the present work the  natMg(p,p0)natMg reaction was investigated in the energy range Ep,lab ~ 2700–4250 keV, at six backward detection angles (120o-170o) suitable for analytical purposes. The measurements were performed using the 5.5 MV TN11 HV Tandem Accelerator of N.C.S.R. ‘‘Demokritos”, Athens, Greece and a high-precision goniometer. The experimental data are compared to data from the literature, when available, and similarities and discrepancies are presented and analyzed.