bluuebunny/crossref_metadata_2025 huggingface dataset:
The Role of Epigenetics in the Regulation of Hemostatic Balance
Authors: Danese Elisa , Montagnana Martina , Gelati Matteo , Lippi Giuseppe
Published: December 2020

Epigenetics, a term conventionally used to explain the intricate interplay between genes and the environment, is now regarded as the fundament of developmental biology. Several lines of evidence garnered over the past decades suggest that epigenetic alterations, mostly encompassing DNA methylation, histone tail modifications, and generation of microRNAs, play an important, though still incompletely explored, role in both primary and secondary hemostasis. Epigenetic variations may interplay with platelet functions and their responsiveness to antiplatelet drugs, and they may also exert a substantial contribution in modulating the production and release into the bloodstream of proteins involved in blood coagulation and fibrinolysis. This emerging evidence may have substantial biological and clinical implications. An enhanced understanding of posttranscriptional mechanisms would help to clarify some remaining enigmatic issues in primary and secondary hemostasis, which cannot be thoughtfully explained by genetics or biochemistry alone. Increased understanding would also pave the way to developing innovative tests for better assessment of individual risk of bleeding or thrombosis. The accurate recognition of key epigenetic mechanisms in hemostasis would then contribute to identify new putative therapeutic targets, and develop innovative agents that could be helpful for preventing or managing a vast array of hemostasis disturbances.
Differential Diagnosis of Central Neurocytoma: Two Cases
Authors: Steinsiepe V.K , Frick H , Jochum W , Fournier J.Y
Published: December 2020

Central neurocytoma are rare primary brain tumors of the young and middle-aged adult, typically located in the lateral ventricles. Diagnosis has historically been difficult due to histomorphologic similarities to oligodendroglioma and ependymal tumors and remains a challenge even today. We present two cases of intraventricular central neurocytoma in which careful consideration of the clinical and radiological findings led to reevaluation of the preliminary histological interpretation, highlighting the importance of a meticulous differential diagnosis.
Band alignment of β-(AlxGa1−x)2O3 alloys via atomic solid-state energy scale approach
Authors: Ota Yuichi
Published: December 2020

We presented a simple estimation method for band alignment of semiconductor alloys based on the atomic solid-state energy (SSE) scale. Our method has the advantage that natural band alignment can be determined using the SSE and energy gap of materials. We investigated several examples of the valence band offset and conduction band offset for β-(AlxGa1−x)2O3 related heterostructures, and our results were in good agreement with previous experimental data. These results indicated that simple and practical prediction of the band offset and alignment of ionic bonded semiconductors can be attained.
Mammalian molar complexity follows simple, predictable patterns
Authors: Selig Keegan R. , Khalid Waqqas , Silcox Mary T.
Published: December 2020

Significance

Recent studies have sought simple developmental models to explain variation in complex structures like mammalian teeth. The inhibitory cascade model (ICM) provides an explanation for the “morphogenetic gradient” of molar size, where a balance between signaling molecules in developing teeth produces predictable, linear proportions across the molars. However, it is unknown if molar form (specifically complexity) can be explained by the ICM. We demonstrate that molar complexity follows a linear, predictable gradient along the molar row. Moreover, whether the pattern is of increasing or decreasing complexity moving from front to back is dependent on the animal’s diet. This study provides a developmental framework for explaining patterns of morphological complexity in molars and for testing developmental and ecological hypotheses in mammals.
Structural and molecular basis of cross-seeding barriers in amyloids
Authors: Daskalov Asen , Martinez Denis , Coustou Virginie , El Mammeri Nadia , Berbon Mélanie , Andreas Loren B. , Bardiaux Benjamin , Stanek Jan , Noubhani Abdelmajid , Kauffmann Brice , Wall Joseph S. , Pintacuda Guido , Saupe Sven J. , Habenstein Birgit , Loquet Antoine
Published: December 2020

Significance

Amyloid folds, while performing functional roles in most domains of life, remain a key factor in the emergence and development of multiple neurodegenerative disorders in humans. The significance of our study is twofold: first, by structurally characterizing highly divergent natural prion amyloids, we uncovered that functional amyloids can evolve in a regime of fold conservation, withstanding extreme sequence diversification. Second, we found that virtually identical amyloid backbone structures might not be sufficient for cross-seeding and that key side-chain positions could determine the seeding specificity of an amyloid fold. This work thus sheds light on the fundamental properties of a major category of pathogenic agents.
Oldenlandia corymbosa (flat-top mille graines).
Authors: Rojas-Sandoval Julissa
Published: December 2020

Oldenlandia corymbosa is a widespread polymorphic weed with a pantropical distribution. It is fast-growing and can rapidly colonize disturbed areas, open sites, gardens, farmlands, forest edges, grasslands, roadsides and riverbanks. O. corymbosa also produces large volumes of tiny seeds that can be easily dispersed by water, animals and vehicles, or as a contaminant in soil and agricultural produce. Its weedy habit, preference for disturbed sites and tiny seeds all facilitate its spread and colonization of new habitats.
Gmelina arborea (candahar).
Authors: Rojas-Sandoval Julissa
Published: December 2020

Due to its rapid growth rate, G. arborea is a tree which has been widely used in reforestation programs in tropical and subtropical regions of the world and as a source of commercial timber and cellulose (Dvorak, 2004; Rojas-Rodríguez et al., 2004; Silva et al., 2005; USDA-ARS, 2016). This species produces large numbers of fertile fruits that are easily dispersed by birds and bats, spreading seedlings quite far from the parent tree (Orwa et al., 2009). In this way, G. arborea has escaped from plantations and entered wild habitats where it is now replacing native trees and becoming invasive (IUCN, 2013). Currently, it is listed as invasive in Costa Rica, the Dominican Republic, Ghana, Australia and the Cook Islands (Chacón and Saborío, 2012; Mir, 2012; IUCN, 2013; PIER, 2016; Weeds of Australia, 2016). It is also separately reported as invasive in Malawi, Tanzania and Zambia.
Over a century of novel conceptual insights: The beginning of JEM’s 125th anniversary year
Authors:   JEM Editorial Team
Published: December 2020

Celebration of JEM’s 125th Anniversary
Current status of neutron electric dipole moment experiments
Authors: Martin J.W.
Published: December 2020

New precise measurements of the neutron electric dipole moment (nEDM) are strongly motivated by the tight constraints they will place on new sources of CP violation. A number of experiments are commencing in the next few years that aim to reduce the experimental uncertainty on the nEDM by more than an order of magnitude. The experiments pursue a variety of complementary techniques. The TUCAN (TRIUMF Ultra-Cold Advanced Neutron) EDM experiment is one such experiment which combines a spallation-driven superthermal He-II source of ultracold neutrons with a room-temperature nEDM spectrometer.
The surprising heavy hadrons production in pp and AA collisions: hadronization within coalescence and fragmentation
Authors: Minissale Vincenzo , Plumari Salvatore , Coci Gabriele , Galesi Giuseppe , Greco Vincenzo
Published: December 2020

The hadronization process of heavy hadrons with bottom and charm quarks, especially for baryons Λ
c
and Λ
b
, in a dense QGP medium is largely not understood. We present within a coalescence plus fragmentation model the predictions for D
0, Ds, Λ
c
, B and Λ
b
spectra and the related baryon to meson ratios at RHIC and LHC in a wide range of transverse momentum region up to 10 GeV, moreover we show the effect of the hadronization mechanism which plays a fundamental role to describe simultaneously the experimental data for the nuclear suppression factor RAA
and the elliptic flow υ
2(pT) of heavy hadrons from RHIC to LHC energies. In particular, we show the considerable change of the Nuclear modification factor of D mesons due to the large Ac production, explaining the RAA
(pT) < 1 observed by STAR at low momenta. We will discuss how our model can naturally predict values of the order of O(1) for Λ
c
/D
0 as recently measured at both RHIC and LHC, and we present the novel predictions for Λ
b
/B not yet measured, which are much larger than the expectations from fragmentation. Moreover assuming that ar the LHC top energies there can be the formation of QGP, we show that in the same scheme due to considerable volume effect a still large Λ
c
/D
0 ≈ 0.5 is predicted as seen by ALICE in pp and pA collisions Furthermore in the same scheme can be predicted a baryon to meson ratio Λ
c
/D
0 in pp collisions assuming that at the LHC top energies there can be the formation of QGP matter. The results show a considerable volume effects that significantly reduce the ratios, but still predict quite larger values with respect to fragmentation, in agreement with recent data from ALICE in pp collisions.
Neutrino-nucleus reactions and their role in supernova nucleosynthesis
Authors: Langanke K. , Martínez-Pinedo G. , Sieverding A.
Published: December 2020

Neutrino reactions on nuclei play important roles for the dynamics of supernovae and their associated nucleosynthesis. This manuscript summarizes the current status in deriving the relevant cross sections for supernova neutrinos and discusses the importance of neutrino-nucleus reactions for supernova nucleosynthesis. In particular we report on the first study of neutrino nucleosynthesis which consistently considers time-dependent spectra for all neutrino flavors as predicted by supernova simulations.
Experimental programme with high-brilliance gamma beams at ELI-NP
Authors: Balabanski Dimiter L.
Published: December 2020

The emerging experimental program with brilliant gamma beams at the Extreme Light Infrastructure – Nuclear Physics (ELI-NP) facility is presented with emphasis on the day-one experiments which are under preparation. Experiments at ELI-NP will cover nuclear resonance fluorescence (NRF) measurements, studies of large-amplitude motions in nuclei, photo-fission and photonuclear reactions of astrophysics interest, and measurements of photonuclear reaction cross-sections. The physics cases of the flagship experiments at ELI-NP and the performance of the related instruments, which are under construction for their realization, are discussed.
Development of a photoionisation spectrometer for detection of atmospheric 85Kr
Authors: Perrett H A , Cooper B S , Edwards G E , Flanagan K T , Ricketts C M , Alsufyani S , Dowd N , Shah A-A
Published: December 2020

A higher than baseline atmospheric concentration of the radioactive fission product 85Kr is considered to be the best indicator of clandestine plutonium separation. Additionally, its high volatility makes it suitable for detecting leaks in nuclear waste containers and damaged fuel cladding. A spectrometer for ultra-trace analysis is currently under development and will be optimised for atmospheric monitoring of 85Kr. This device is based on an adapted form of collinear resonance ionisation spectroscopy, a technique developed at ISOLDE-CERN for performing precision measurements on exotic nuclei. The motivation for this device is explored, along with an overview of progress and future developments.
Considerations on the composition and spectra of the secondary radiation fields inside the E1 experimental area at ELI-NP
Authors: Popovici Maria – Ana , Vasilache Radu A.
Published: December 2020

At the new ultrahigh power laser facility ELI NP, experiments on the interaction of high power lasers and matter will be conducted. These experiments are expected to produce beams of highly energetic particles resulting in secondary radiation fields which will be highly complex and rather difficult to measure given their specifics (extremely short bursts, with time widths in the range of nanoseconds). The ELIFLUKA project was started to assess the doses in the areas surrounding the experimental halls, to evaluate the efficiency of the existing shielding solutions, to propose, if necessary, their optimization, and give optimal ways to monitor the radiation fields that might affect the facility personnel. The present paper is focused on the results concerning the composition and the spectra of the secondary radiation fields inside the E’ experimental hall. A complex FLUKA geometry of the El area was built according to the real design of the experimental hall. With FLUKA we calculated the particle fluencies, the spatial distribution and spectra of each component of the radiation field, corresponding to two limit source terms, characterised by a thermal energy distribution with 40 MeV average and 250 MeV cut-off, and a second one with a flat energy distribution with 500 MeV average and 50 MeV FWHM. The FLUKA code was used to calculate all particle fluence spatial distribution inside the experimental hall, as well as the fluences and spectra for the main components of secondary radiation fields. These results can be used to design various experimental setups at E1 in such a way that the instruments would be positioned without risking significant activation and/or radiation damage and they provide a source term for the shielding calculations using the classical methods, as usually requested by the regulatory authorities.
A Prototype Detector Array for Measurements in Laser Accelerated Charged Particle Beams
Authors: Vasilache Radu A. , Popovici Maria–Ana , Straticiuc Mihai , Matei Consuela Elena , Stroe Daniela , Crăciun Liviu , Radu Mihai , Maria Niță Laura Ana
Published: December 2020

In all the future applications of the laser accelerated beams (as generated in the ELI and CETAL projects) in-beam dose measurements will be needed. The gold standard in dose measurement remain the ion chambers, but for the beams we intend to measure they do present some limitations given be the large number of corrections to be applied in order to calculate a correct dose from the measured charge. The ELIDOSE project is addressing these problems by proposing an array detector that would allow the simultaneous measurement of the recombination and polarity corrections, as well as of the dose – the QUADRO-fm (Quad Detector for RecOmbination factor measurement). The prototype detector consists of 4 identical ion chambers mounted together in a PMMA frame and the project analyses its response to various charged particle beams and the reciprocal influences of the chambers on each other. This reciprocal influences of the four chambers have been studied in well characterised therapy electron beams and conclusions regarding further developments have been drawn. The paper presents the characterisation of the proton and electron beams used in the experiment, as well as the dose measurements in the 5 MeV electron beams generated by a Siemens radiotherapy LINAC and the comparison with the FLUKA based simulations.
Measuring the half-life of n-rich 100Rb with the TITAN MR-TOF-MS
Authors: Mukul I. , Andreoiu C. , Brodeur M. , Brunner T. , Dietrich K. , Dickel T. , Dillmann I. , Dunling E. , Fusco D. , Gwinner G. , Izzo C. , Jacobs A. , Kootte B. , Lan Y. , Leistenschneider E. , Lykiardopoulou M. , Paul S. F. , Reiter M. P. , Tracy J. L. , Dilling J. , Kwiatkowski A. A.
Published: December 2020

Multiple-reflection time-of-flight mass spectrometers (MR-TOF-MS) have been demonstrated to have a mass resolving power in the range of few hundreds of thousand. The TITAN MR-TOF-MS has been used to separate isobaric impurities and measure masses of many rare isotopes. Recently we have measured the mass and half-lives of neutron-rich Rubidium isotopes with the MR-TOF-MS. This technique is capable of measuring the half-life of rare isotopes in the range of few tens of millisecond. In this proceeding, we present the measurement of half-life of 100Rb that was found to be 50±5 ms, in good agreement with literature value of 48±3 ms.
Systematic study of pasta nuclei in neutron stars with families of the empirical nuclear equations of state
Authors: Oyamatsu Kazuhiro , Iida Kei , Sotani Hajime
Published: December 2020

The structures of pasta nuclei in the crust of a neutron star are investigated systematically by using a family of the equations of state (EOSs) of nuclear matter within the framework of the Thomas-Fermi theory. This EOS family is given as a function of the incompressibility K
0 of symmetric nuclear matter and the parameter L that characterizes the density dependence of the symmetry energy. The remaining saturation parameters are chosen so that the masses and radii of stable nuclei calculated within the framework are consistent with the empirical values. The structure of a neutron-rich nucleus is determined by the local pressure balance of asymmetric nuclear matter, which is mainly controlled by L and K
0. With this EOS family, we calculate the structure of pasta nuclei in the crust of a neutron star, and examine its (K
0, L) dependence. It is found that the existence of pasta nuclei is mainly determined by L. For sufficiently small L, as the matter density increases, the shape of the nuclei changes from sphere to cylinder, slab, cylindrical hole and spherical hole successively. For larger L, this sequence of the shape change may end before reaching spherical hole. All the pasta shape can exist for L ≤ 70 MeV, while no pasta shape appears for L ≥ 110 MeV. The density width of each pasta phase, the energy and volume fraction at the onset of each pasta phase have a clear correlation with L while the onset density also has an appreciable Ko dependence.
Change of 7Be decay rate under compression
Authors: Sikdar A. K. , Ray A. , Das P. , Pathak S. , Datta J.
Published: December 2020

We have studied the change of decay rate of 7Be implanted in the small Pd lattice versus large Pb lattice. Since the electron affinities of Pd and Pb are very low and similar, any observed increase of the decay rate of 7Be could be attributed to the compressional effect in the smaller confinement of Pd lattice. It has been found that the decay rate of 7Be is faster in Pd lattice compared to that in Pb lattice by (0.82± 0.16)%. Similar results were observed by applying high external pressure on 7BeO lattice. Density functional calculations underpredict the increase of 7Be decay rate under compression by a large factor. It is important to understand this result because of its significance in calculating 7Be decay rate in the solar core and corresponding 8B neutrino flux.
Exploring continuum structures in reactions with three-body nuclei
Authors: Casal J. , Gómez-Ramos M. , Moro A. M. , Corsi A.
Published: December 2020

The Transfer to the Continuum method has been applied to describe the 11Li(p, pn) and 14Be(p, pn) reactions in inverse kinematics, using structure overlaps computed within a full three-body model for the projectile. Calculations agree with the available experimental data on the unbound 10Li and 13Be nuclei.
Combining nuclear reactions and structure with the dispersive optical model
Authors: Dickhoff W. H. , Atkinson M. C.
Published: December 2020

A review of recent applications of the nonlocal dispersive optical model (DOM) is presented that allows a simultaneous description of nuclear structure and nuclear reactions. An assessment of the quality of the resulting potentials for 40Ca and 48Ca is discussed for the description of the (e, e′p) reaction to valence hole states and the possibility of interpreting the data in terms of absolute spectroscopic factors. The relevance of these results in the context of conflicting interpretations between transfer and knockout reactions is pointed out as well as the importance of proton reaction cross sections for isotopes with neutron excess. Application of the nonlocal DOM to 48Ca incorporates the effect of the 8 additional neutrons and allows for an excellent description of elastic scattering data of both protons and neutrons. The corresponding neutron distribution constrained by all available data generates a prediction for the neutron skin that is larger than most mean-field and available ab initio results. Results are presented for the most recent nonlocal DOM analysis of 208Pb.
Isospin Effect on fragment productions and reaction mechanisms for Ni+Ca systems at 25 AMeV
Authors: Geraci E , Cardella G , Colonna M , De Filippo E , Gnoffo B , Lanzalone G , Lo Monaco L , Maiolino C , Martorana N S , Pagano A , Pagano E V , Papa M , Pirrone S , Politi G , Russotto P , Rizzo F , Trifiró A , Trimarchi M , Barlini S , Bougault R , Bruno M , Casini G , D’Agostino M , Gramegna F , Neindre N Le , Morelli L , Piantelli S
Published: December 2020

Main features of fragments produced in 58Ni+40Ca and 58Ni+48Ca systems at 25 AMeV, collected by Chimera multidetector at INFN Laboratori Nazionali del Sud (Italy), are analysed in order to study properties of moderately excited systems (Ex=2-5 AMeV) formed in central collisions. By means of correlations between specific global variables, sensitive to the centrality of the collision, a stringent selection of Fusion-Evaporation residues, Multifragmentation sources and their decay products has been performed. The influence of the isospin contents of the systems on the reaction mechanism is carefully investigated and relevant observables such as isospin asymmetry N/Z or charge and mass of fragments, are discussed in order to probe the fragmentation path, characterised by short living ( ∼ 100fm/c) low density states of nuclear matter out of equilibrium. Preliminary comparisons with predictions of the BLOB model, in a semi-classical mean field framework, are presented, investigating cluster production emerging from the occurrence of low-density instabilities in central collisions.
Role of higher order deformations in fission fragment mass distribution of Astatine isotopes within collective clusterization approach
Authors: Kaur Amandeep , Sharma Manoj K.
Published: December 2020

The fission fragment mass distribution is used as an investigation tool which assists to disentangle between different modes of fission (symmetric fission and asymmetric fission). In the present work, the fission dynamics of various ‘At*’ isotopes with mass number A=191 to 220 formed in 19F-induced reactions at common centre-of-mass energy Ec.m
.=78.5 MeV is explored. The calculations are made within the dynamical cluster-decay model (DCM) using three type of fragmentation such as spherical, (β
2-deformed and (β
2 – β
2-deformed with hot compact optimized orientations. The structural effects come into picture when deformation effects are included in the fragmentation potential. The mass distributions of ‘At*’ isotopes gets significantly modified after inclusion of deformation effects of decaying fragments. The preformation yield shows a drift from symmetric to asymmetric fission with increase in mass of compound nuclei from ACN
=191 to 220. The clear signature of fine-structure effects is evident in view of single humped to double humped preformation structure in the fissioning region. However, the mass division of At isotopes is symmetric for spherical choice of fragments. Finally, the analysis of hot (compact) and cold (elongated) configurations of β
2-deformed and

θ
i

o
p
t

oriented fragments is also carried out.
Study of fusion hindrance in the system 12C+24Mg
Authors: Montagnoli G. , Stefanini A.M. , Jiang C.L. , Colucci G. , Goasduff A. , Brugnara D. , Mazzocco M. , Siciliano M. , Scarlassara F. , Corradi L. , Fioretto E. , Galtarossa F. , Heine M. , Patten T. Van , Szilner S. , Ćolović P. , Mijatović T. , Bottoni S. , Jaworski G. , Zanon I.
Published: December 2020

The phenomenon of fusion hindrance may have important consequences on the nuclear processes occurring in astrophysical scenarios, if it is a general behaviour of heavy-ion fusion at extreme sub-barrier energies, including reactions involving lighter systems, e.g. reactions in the carbon and oxygen burning stages of heavy stars. The hindrance is generally identified by the observation of a maximum of the S-factor vs. energy. Whether there is an S-factor maximum at very low energies for systems with a positive fusion Q-value is an experimentally challenging question. Our aim has been to search evidence for fusion hindrance in 12C + 24Mg which is a medium-light systems with positive Q-value for fusion, besides the heavier cases where hindrance is recognised to be a general phenomenon. The experiment has been performed at the XTU Tandem accelerator of LNL by directly detecting the fusion evaporation residues at very forward angles. The excitation function has been extended down to ≃10μb, i.e. 4 orders of magnitude lower than previous measurements and we observe that the S-factor develops a clear maximum vs. energy. Coupled-Channels calculations using a Woods-Saxon potential give a good account of the data near and above the barrier but over predict the cross sections at very low energies. Therefore the hindrance phenomenon is clearly recognised in 12 C + 24 Mg with an energy threshold that nicely fits the systematics in several medium-light systems. The fusion cross sections at the hindrance threshold show that the highest value (as=1.6mb) is indeed found for this system. It may be possible to extend the measurements further down in energy.
Regularized pseudopotential for mean-field calculations
Authors: Bennaceur K , Dobaczewski J , Haverinen T , Kortelainen M
Published: December 2020

We present preliminary results obtained with a finite-range two-body pseudopotential complemented with zero-range spin-orbit and density-dependent terms. After discussing the penalty function used to adjust parameters, we discuss predictions for binding energies of spherical nuclei calculated at the mean-field level, and we compare them with those obtained using the standard Gogny D1S finite-range effective interaction.
Triangular symmetry in cluster nuclei
Authors: Bijker R. , Santana-Valdés A.H.
Published: December 2020

In this contribution, we present evidence for the occurrence of triangular symmetry in cluster nuclei. We discuss the structure of rotational bands for 3α and 3α +1 configurations with triangular D
3h
symmetry by exploiting the double group

D

3
h

′

and study the application to 12 C and 13C. The structure of rotational bands can be used as a fingerprint of the underlying geometric configuration of α particles.
Reaction Channel selection techniques and γ – γ fast-timing spectroscopy using the ν-Ball Spectrometer
Authors: Canavan R.L. , Rudigier M. , Regan P.H. , Lebois M. , Wilson J.N. , Jovancevic N. , Söderström P.-A. , Thisse D. , Benito J. , Bottoni S. , Brunet M. , Cieplicka-Oryńczak N. , Collins S.M. , Courtin S. , Doherty D.T. , Fraile L.M. , Hadyńska-Klęk K. , Heine M. , Iskra Ł.W. , Karayonchev V. , Kennington A. , Koseoglou P. , Lotay G. , Lorusso G. , Nakhostin M. , Niţă C.R. , Oberstedt S. , Podolyák Zs. , Qi L. , Régis J.-M. , Shearman R. , Vedia V. , Witt W.
Published: December 2020

The reaction of a pulsed 18O beam on a self-supporting and gold-backed isotopically-enriched 164Dy target of thickness 6.3 mg/cm2 at separate primary beam energies of 71, 76 and 80 MeV was studied at the accelerator at the ALTO facility of the IPN Orsay. The γ rays produced were detected using the newly-constructed ν-Ball spectrometer which comprised of HPGe and LaBr3(Ce) detectors. This conference paper describes the methodology and effectiveness of multiplicity/sum-energy gating, for channel selection between fusion evaporation events and lower multiplicity/energy events from inelastic nuclear scattering and Coulomb excitation of the target, and from two-neutron transfer reactions to 166Dy.
Spectroscopic Tools Applied to Flerovium Decay Chains
Authors: Cox D. M. , Såmark-Roth A. , Rudolph D. , Sarmiento L.G. , Fahlander C. , Forsberg U. , Golubev P. , Heery J.A.M. , Yakushev A. , Albers H. M. , Block M. , Brand H. , Clark R.M. , Düllmann Ch.E. , Eberth J. , Gates J.M. , Giacoppo F. , Götz M. , Götz S. , Herzberg R.-D. , Jäger E. , Kindler B. , Khuyagbaatar J. , Kojouharov I. , Kratz J.V. , Krier J. , Kurz N. , Lens L. , Lommel B. , Mistry A. , Meyer C.-C. , Mokry C. , Papadakis P. , Pore J.L. , Runke J. , Thörle-Pospiech P. , Trautmann N. , Schaffner H , Schausten B. , Uusitalo J.
Published: December 2020

An upgraded TASISpec setup, with the addition of a veto DSSD and the new Compex detector-germanium array, has been employed with the gas-filled recoil separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung Darmstadt, to study flerovium (element 114) decay chains. The detector upgrades along with development of new analytical techniques have improved the sensitivity of the TASISpec setup for measuring α-photon coincidences. These improvements have been assessed with test reactions. The reaction 48Ca+206,207Pb was used for verification of experimental parameters such as transmission to implantation DSSD and target-segment to α-decay correlations. The reaction 48Ca+
nat
Hf was used to produce several short-lived nuclei with multiple-α decay chains to investigate pile-up event deconvolution.
Halo-like structure in 7He nucleus
Authors: Demyanova A S , Ogloblin A A , Chernishev B A , Goncharov S A , Gurov Yu B , Lapushkin S V , Belyaeva T L , Danilov A N , Starastsin V I , Trzaska W H
Published: December 2020

A study of the neutron structure of the ground state of 7He has been performed by means of registration and analysis of the decay channels of the residual nuclei following absorption of stopped pions. In particular, the reaction 9Be (

π

−

,
d

)X have been investigated where X denotes any system with five neutrons and two protons – the constituencies of a 7He nucleus. It was shown that the structure of 7He is determined by correlations of two neutrons in the states 6He (0+), 6He (2+) and one neutron in the shell p3/2. The 4He+3n structure is not manifested in the ground state of 7He. The obtained results are consistent with the known data on considerable mixture of configurations “6He in its ground and first excited states plus a neutron” in the ground state of 7He. Comparison of the diffraction components of the differential cross-sections of the charge-exchange reactions (t, 3He) measured on 6Li and 7Li allowed extracting the radius of particle-unstable nucleus 7He. The latter occurred to be approximately equal to those of 6He and 8He. The obtained result indicates to existence of the halo-like structure in 7He.
Nuclear incompressibility from spherical and deformed nuclei
Authors: Gambacurta Danilo , Colò Gianluca , Pastore Alessandro
Published: December 2020

We present an analysis based on the deformed Quasi Particle Random Phase Approximation, on top of a deformed Hartree-Fock-Bogoliubov description of the ground state, aimed at studying the isoscalar monopole and quadrupole response in a deformed nucleus. This analysis is motivated by the need of understanding the coupling between the two modes and how it might affect the extraction of the nuclear incompressibility from the monopole distribution. After discussing this motivation, we present the main ingredients of our theoretical framework, and we show some results obtained with the SLy4 and SkM* interactions for the nucleus 24Mg.
Multiple Shape Coexistence in 110,112Cd and Beyond Mean Field Calculations
Authors: Garrett P.E. , Rodríguez T.R. , Varela A. Diaz , Green K.L. , Bangay J. , Finlay A. , Austin R.A.E. , Ball G.C. , Bandyopadhyay D.S. , Bildstein V. , Colosimo S. , Cross D.S. , Demand G.A. , Finlay P. , Garnsworthy A.B. , Grinyer G.F. , Hackman G. , Jigmeddorj B. , Jolie J. , Kulp W.D. , Leach K.G. , Morten A.C. , Orce J.N. , Person C.J. , Phillips A.A. , Radich A.J. , Rand E.T. , Schumaker M.A. , Svensson C.E. , Sumithrarachchi C. , Triambak S. , Warr N. , Wong J. , Wood J.L. , Yates S.W.
Published: December 2020

Detailed spectroscopy employing the β
+/EC decay of 110,112In and the β
− decay of 112Ag has been used to study the excited states of 110,112Cd. Low-energy decay branches from highly excited states have been observed and, combined with level lifetimes from the (

n
,

n

’

γ

) reaction, permit B(E2) values to be determined thus revealing rotational-like bands built on excited 0+ states and γ bands built on the ground and the shape-coexisting intruder states. The excitation energies of the

0
4
+

states appear incompatible with that expected for a pure π(4p6h) configuration. The experimental results for the 0+ excited states are compared with beyond-mean-field calculations that suggest they possess different shapes, including prolate, oblate, and triaxial.
The γ decay of the Hoyle and higher excitation energy states of 12C
Authors: Cardella G. , Favela F. , Martorana N.S. , Acosta L. , Auditore L. , Camaiani A. , Filippo E. De , Gelli N. , Geraci E. , Gnoffo B. , Guazzoni C. , Marìn-Làmbarri J. , Lanzalone G. , Maiolino C. , Monaco L. Lo , Nannini A. , Pagano A. , Pagano E.V. , Papa M. , Pirrone S. , Politi G. , Pollacco E. , Quattrocchi L. , Rizzo F. , Russotto P. , Santonocito D. , Sicari V. , Trifiró A. , Trimarchi M.
Published: December 2020

The

0
2
+

Hoyle state and few other excited levels of 12C are fundamental for the production of carbon in the universe. In particular, the γ decay branching ratio is of utmost importance, being the only way to produce a carbon at the ground state. For the purpose to precisely investigate the decay mechanism of such states we conducted an experiment, at Laboratori Nazionali del Sud-Istituto Nazionale di Fisica Nucleare (INFN-LNS), using the reaction α + 12 C at 64 MeV. We used the 4π CHIMERA detector to detect both α and γ
12 C decay channels. Details of the experiment and preliminary results are discussed in the paper.
Dealing with contaminants in Coulomb excitation of radioactive beams
Authors: Morrison L , Hadyńska-Klęk K , Podolyák Zs , Gaffney L P , Kaya L , Berry T , Boukhari A , Brunet M , Canavan R , Catherall R , Colosimo S J , Cubiss J G , Witte H De , Doherty D T , Fransen Ch , Giannopoulos E , Grawe H , Hess H , Kröll T , Lalović N , Marsh B , Martinez Palenzuela Y , O’Neill G , Pakarinen J , Ramos J P , Reiter P , Rodriguez J A , Rosiak D , Rothe S , Rudigier M , Siciliano M , Simpson E C , Spagnoletti P , Thiel S , Warr N , Wenander F , Zidarova R , Zielińska M
Published: December 2020

Data analysis of the Coulomb excitation experiment of the exotic 206Hg nucleus, recently performed at CERN’s HIE-ISOLDE facility, needs to account for the contribution to target excitation due to the strongly-present beam contaminant 130Xe. In this paper, the contamination subtraction procedure is presented.
Investigation of the Pygmy Dipole Resonance in photon scattering experiments
Authors: Müscher Miriam , Isaak Johann , Savran Deniz , Schwengner Ronald , Wilhelmy Julius , Zilges Andreas
Published: December 2020

The Pygmy Dipole Resonance (PDR) is the dominating electric dipole excitation below and around the particle separation threshold and exhausts only a few percent of the energy-weighted sum rule. Nevertheless, it may have some impact on reaction rates in nucleosynthesis processes. Therefore, investigations to get more insights in this excitation mode are crucial. A common approach to study the PDR of atomic nuclei is the Nuclear Resonance Fluorescence method (NRF) which bases on real-photon scattering. Absolute cross sections, spin and parity quantum numbers are determined in a model-independent way if suited experimental setups are used. In general, there are two complementary NRF experiments which are presented in this paper.
Lifetime determination via the particle-γ coincidence Doppler-shift attenuation method
Authors: Prill S , Bohn A , Everwyn V , Färber M , Hennig A , Kluwig F , Petkov P , Scholz P , Spieker M , Weinert M , Wilhelmy J , Zilges A
Published: December 2020

This paper illustrates the principle of the Doppler-shift attenuation method (DSAM) using particle-γ coincidences, a method for determining lifetimes of excited nuclear levels in the range of few femtoseconds up to one picosecond. The coincident detection holds several advantages towards conventional DSAM experiments, such as the elimination of background and feeding transitions. Using the experimental data on 94Zr, the concept of the (p,p’γ) DSAM analysis is presented. Additional experimental results are highlighted.
Sensitivity of core+n potential on configuration mixing in ground state of neutron-rich exotic nuclei
Authors: Singh Jagjit , Horiuchi W.
Published: December 2020

We study the configuration mixing in the ground state of the neutron-rich exotic nuclei. The results for weakly-bound two-neutron halo nuclei 11Li and 22C, and the two-neutron unbound nucleus 26O are reported. For the present study, we use a three-body (core + n + n) structure model developed for describing the two-neutron halo system by explicit coupling of unbound continuum states of the subsystem (core + n). We use a density-dependent contact-delta interaction to describe the neutron-neutron interaction and its strength is varied to fix the binding energy. We report the two-neutron correlations in the ground state of these systems.
Exploring the latest quark-meson coupling model for finite nuclei
Authors: Martinez K L , Thomas A W , Stone J R , Guichon PAM
Published: December 2020

The quark-meson coupling (QMC) model describes atomic nuclei on the basis of the quark structure of nucleons and their self-consistent change as they interact with each other in the nuclear medium. The model has been successfully applied to even-even nuclei across the entire nuclear chart and results were comparable to other existing models despite having fewer adjustable parameters. Nuclear matter properties derived from the model are also within the widely used range of values. In this paper, we explore the latest version of the model, QMCπ-II. We put some emphasis on QMC predictions for neutron skin thickness which will be the subject for experiments in the near future. QMCπ-II predicts a value of around 0.15 and 0.16 fm for 48Ca and 208Pb, respectively, with the slope of symmetry energy at around 40 MeV.
Spectroscopy of 16B from quasi-free (p,pn) reaction with 17B
Authors: Yang Z. H. , Kubota Y. , Corsi A. , Authelet G. , Baba H. , Caesar C. , Calvet D. , Delbart A. , Dozono M. , Feng J. , Flavigny F. , Gheller J.-M. , Gibelin J. , Giganon A. , Gillibert A. , Hasegawa K. , Isobe T. , Kanaya Y. , Kawakami S. , Kim D. , Kiyokawa Y. , Kobayashi M. , Kobayashi N. , Kobayashi T. , Kondo Y. , Korkulu Z. , Koyama S. , Lapoux V. , Maeda Y. , Marqués F. M. , Motobayashi T. , Miyazaki T. , Nakamura T. , Nakatsuka N. , Nishio Y. , Obertelli A. , Ohkura A. , Orr N. A. , Ota S. , Otsu H. , Ozaki T. , Panin V. , Paschalis S. , Pollacco E. C. , Reichert S. , Roussé J.-Y. , Saito A. T. , Sakaguchi S. , Sako M. , Santamaria C. , Sasano M. , Sato H. , Shikata M. , Shimizu Y. , Shindo Y. , Stuhl L. , Sumikama T. , Sun Y. , Tabata M. , Togano Y. , Tsubota J. , Uesaka T. , Yasuda J. , Yoneda K. , Zenihiro J.
Published: December 2020

Spectroscopy of 16B plays an essential role in understanding the halo structure in 17B, but very limited knowledge has so far been obtained. We have carried out a kinematically complete measurement on the spectroscopy of 16B by using quasi-free (p,pn) reaction on 17B. The level scheme of 16B up to 5 MeV was made clear for the first time.
The 3D Nuclide Chart
Authors: Simpson E. C.
Published: December 2020

We present an overview of The 3D Nuclide Chart, a new online nuclide chart designed for producing high quality 3D nuclide chart images for use in publications, presentations, education and outreach. An historical overview of the design of nuclide charts is given, followed by a description of The 3D Nuclide Chart itself.
Theragnostics - Alternative production of terbium isotopes at the University of Birmingham using an MC40 cyclotron
Authors: Trinder R. R. , Kokalova Tz. , Parker D. J. , Wheldon C. , Phoenix B. , Ivanov P. , Russel B. , Webster B. , Regan P. , Robinson A. , Cullen D. , Pells S. , Allen R. , Pirrie S. , Turner A. , Santa Rita P.
Published: December 2020

In this work alternative methods for the production of terbium isotopes, and in particular 152Tb and 155Tb, have been investigated. These isotopes, which could be used for theragnostics, have been produced using an alpha and a proton beam incident on europium and gadolinium targets, respectively. The experimental results have been compared with the predicted cross-sections, calculated using TALYS and PACE4 code.
The influence of the cross-sectional shape of the body on the parameters of flexural-gravity waves during under-ice motion
Authors: Zemlyak V L , Kozin V M , Vasilyev A S , Rogozhnikova E G
Published: December 2020

When solving the problem of a submarine movement near the lower surface of the ice cover, the hull of the submarine, which has a complex geometry, is usually changed to a body of rotation, having a simplified form while maintaining basic characteristics. In turn, the cross-sectional shape of the hull can have a significant effect on the parameters of flexural-gravity waves generated by the movement of the submarine. The paper describes an experimental study of the influence of the cross-sectional shape of the models of submerged bodies having the same elongation, displacement and cross-sectional area, and a different ratio of the hull height to their width on the ice-breaking ability of flexural-gravity waves. It is analysed how the poorly hydrodynamic form of a submerged body affects the parameters of flexural-gravity waves. The nature of ice failure during the movement of submerged bodies of different forms is defined.
Some pioneering research in laboratory simulation of scaled astrophysical phenomena by Russian physicists
Authors: Baranov P F , Zatonov I A
Published: December 2020

The review about the problems of astrophysical phenomena pioneering researching by Russian recognized physicists – S.Anisimov, I.V.Minin, O.V.Minin, V.F.Minin and A.Velikovich - is carried out. For the first time, a mode of hypercumulative collapse of a conical cavity was proposed for the formation of an ultra-high-speed plasma jet. The description of “cumulative plasma jets” is presented. The main parameters of the cumulative plasma jet and the results of laboratory studies on the creation of a hyper cumulative plasma jet are described. It was shown that the proposed mechanism allows one to obtain record characteristics of such a jet, which have not been surpassed so far. Test data description of the numerical simulation of the inter action between plungers and a conic cavity on the explosive initiation of the D-D reaction with the aid of aluminum plungers is discussed. The mechanisms of the plunger surface acceleration are described. The generation of the Mach configuration of shock waves in the target was also used for the explosive production of wurtzite with a record yield of the mass of the synthesized material and to focusing of the shock waves in water using plane diffractive optics.
The study of pressing mechanically activated niobium and silicon powder mixtures
Authors: Shkoda O A
Published: December 2020

The paper presents the results obtained in the study of the pressing process of mechanically activated powder mixtures of the niobium – silicon system. Pressing often precedes the process of self-propagating high-temperature synthesis and the initial density of the compressed samples can have a significant impact on the regime of subsequent high-temperature combustion, on the composition and properties of the final product (niobium silicide). The obtained dependences of porosity on the time of mechanical activation showed the features of pressing, which are associated with the formation of layered agglomerates in the process of mechanical activation. It was found that the compression curves of mechanoactivated powders differ qualitatively from the standard compression curves of fine powders. The paper considers the influence of mechanical activation time on the density of the compressed samples obtained by varying the pressing pressure and the time spent under the press. The relationship between the density of compresses and layered agglomerates, which are formed during mechanical activation, is considered.
Calculation of gas flow through the flow of axial turbocompressors
Authors: Lubysheva A I , Potashev A V , Potasheva E V
Published: December 2020

When designing centrifugal compressors, much attention is paid to increasing the efficiency of the compression process with a wide range of changes in the operating modes of the stages. In this regard, the role of methods that make it possible to calculate the characteristics taking into account the compressibility of the gas flow through the elements of the flow path increases. In this work, the development of the method for solving the second two-dimensional problem is given, which makes it possible to calculate the subsonic gas flow. In this case, impellers with both single-row and multi-row blade elements are considered.
Investigation of the turbulent structure in a flame and the effect of small infrasonic exposure on it using IR thermography methods
Authors: Loboda E L , Agafontsev M V , Klimentiev A S , Kasymov D P , Loboda Y A , Martynov P S , Reyno V V
Published: December 2020

The paper presents the results of studies of gasoline and diesel fuel diffusion combustion using IR thermography methods. Experimental results of the effect of small amplitude pressure pulsations with various frequencies on the spectra of temperature changes in the flame and other characteristics are obtained. It is shown that the effect of pressure pulsations with certain frequencies leads to a change in the flame height, fuel burning-up rate and the appearance of characteristic frequency maximum in the spectra of temperature changes in the flame.
Modification of the fictitious absorption method for solving integral equations of mixed problems for arbitrary simply connected regions
Authors: Telyatnikov I S , Pavlova A V , Kapustin M S
Published: December 2020

We presented a modification of the fictitious absorption method (FAM), which is used to solve integral equations (IE) of mixed dynamic problems. The method was generalized for the case of the defector stamp occupying a non-convex in plane area. For regions of complex configuration, we assumed the possibility of their representation as a union of convex bounded closed regions, possibly with common boundary sets. We proposed to modify the method in terms of the selection of basis functions that are present in the solution only under the signs of integral operators. The derivatives of Dirac delta functions with supports in the boundary sets of the considered regions were chosen as such. A more complex form of the functions used provided a more convenient form of the solution. As an illustration of the modified MFA use in the basis functions we present solutions of integral equations of the first kind for an axisymmetric problem of steady-state vibrations of an elastic layer with a clamped bottom edge under the action of a surface load and a horizontally oriented internal source.