bluuebunny/crossref_metadata_2025_split huggingface dataset:
A New Approach to Determine the 120(α,γ)16O Reaction Rate at Astrophysical Energies
Authors: Friščić Ivica , William Donnelly T. , Milner Richard G. 
Published: December 2020

Abstract
The ∼100% uncertainty in the measured rate of the 12C(α,γ)16O reaction at low energies (

E
α

c
m

⩽
1
MeV

) is the largest source of uncertainty in any stellar evolution model. With development of new, high-current, energy-recovery linear accelerators (ERLs) and high density gas targets, measurement of the 16O(e, e′α)12C reaction close to threshold using detailed balance opens up a new approach to determine the 12C(α,γ)16O reaction rate with increased precision (< 20%). We have considered the optimal design of an experiment where systematic uncertainties are minimized. Once the new ERLs commence operation near their design specifications, an experiment to validate the new approach we propose should be carried out. Our method has broad applicability to radiative capture reactions in astrophysics.
Radiative neutron capture rate of 19N(n, γ)20N
Authors: Singh G. , Shubhchintak  , Dan M. , Chatterjee R. 
Published: December 2020

Abstract
Low and medium mass neutron rich nuclei have been thought of as important constituents in the final abundance patterns resulting from the r-process reaction network calculations. However, a direct study of these nuclei is extremely difficult and indirect methods like Coulomb dissociation are used for their investigation. We calculate the reaction rate of the 19N(n,γ)20N radiative capture reaction using Coulomb dissociation of the medium mass exotic nucleus 20N, under the aegis of finite range distorted wave Born approximation theory and compare our results with those from the experiment. The reaction rate, when included in the full reaction network, is thought to be crucial to the final abundance of Fluorine isotopes.
Significance of lower energy density region of neutron star and universalities among neutron star properties
Authors: Husain Wasif , Thomas Anthony W. 
Published: December 2020

Abstract
We have constructed and compared models of rotating neutron stars and strange stars, within the Hartle framework. The significance of the low energy density region and crust region inside the neutron star has been studied, along with how much the existence of strange matter above the energy density 300 MeV/fm3 can affect the neutron star properties. We have confirmed several universalities among the neutron star properties such as, dimensionless moment of inertia vs dimensionless quadrupole moment, dimensionless tidal deformability vs dimensionless moment of inertia and moment of inertia parameters vs R/2M.
Experiments on astrophysical reactions with low-energy unstable nuclei beams at CRIB
Authors: Yamaguchi G. , Hayakawa S. , Ma N.R. , Shimizu H. , Yang L. , Kahl D. , Abe K. , Suhara T. , Iwasa N. , Kim A. , Kim D.H. , Cha S.M. , Kwag M.S. , Lee J.H. , Lee E.J. , Chae K.Y. , Wakabayashi Y. , Imai N. , Kitamura N. , Lee P. , Moon J.Y. , Lee K.B. , Akers C. , Jung H.S. , Duy N.N. , Khiem L.H. , Lee C.S. , Cherubini S. , Gulino M. , Spitaleri C. , Rapisarda G.G. , Cognata La , Lamia L. , Romano S. , Coc A. , de Sereville N. , Hammache F. , Kiss G. , Bishop S. , Teranishi T. , Kawabata T. , Kwon Y.K. , Binh D.N. 
Published: December 2020

Abstract
Studies on nuclear astrophysics, nuclear structure, and other interests have been performed using the radioactive-isotope (RI) beams at the low-energy RI beam separator CRIB, operated by Center for Nuclear Study (CNS), the University of Tokyo. The elastic resonant scattering is a striking tool to study astrophysical reactions and nuclear clusters. In particular, when it is coupled with a thick target and inverse kinematics, the measurement can be very efficient and even feasible with RI beams. By measuring resonant scattering, we can study the properties of resonant states which could play an important role in the astrophysical reaction, or have an exotic nuclear structure. The 10Be+α elastic scattering has been measured at CRIB, and three resonances which are in agreement with the prediction of a linear-chain structure by Suhara-En’yo were observed, giving a strong indication of the existence of such an exotic structure. Measurements based on the indirect technique of the reaction measurement, such as the Trojan horse method, have also been performed at CRIB.
Investigating the relation between heavy ion double charge exchange nuclear reactions and double beta decays
Authors: Bellone J I , Burrello S , Colonna M , Lay J A , Lenske H 
Published: December 2020

Abstract
Heavy ion double charge exchange reactions (DCE) are discussed, within DWBA, in synergy with the main goal of the NUMEN project, i. e. to extract information on the 0νββ decay nuclear matrix element from DCE cross section measurements. The first step to reach this goal is to assess the analogy between the DCE nuclear matrix element and that describing 0νββ decay; then it is necessary to single out a term related to the desired double beta decay nuclear matrix element from the DCE cross-section expression (cross section factorization).
Heavy ion DCE processes, are depicted in terms of sequence of two correlated or uncorrelated Single Charge Exchange (SCE) reactions, resembling in this way 0νββ and 2νββ decay, respectively. Here, the formalism for describing DCE reactions within the latter scenario is described.
Once provided the formalism leading both to SCE and DCE cross section factorization, together with its limitations, a preliminary comparison with experimental DCE data is shown.
Recent results on heavy-ion induced reactions of interest for neutrinoless double beta decay at INFN-LNS
Authors: Cappuzzello F. , Agodi C. , Acosta L. , Altana C. , Amador-Valenzuela P. , Auerbach N. , Barea J. , Bellone J. , Bijker R. , Bonanno D. , Borello-Lewin T. , Boztosun I. , Branchina V. , Brasolin S. , Brischetto G. , Brunasso O. , Burrello S. , Calabrese S. , Calabretta L. , Calvo D. , Capirossi V. , Carbone D. , Cavallaro M. , Garcia L.E. Charon , Chávez Lomelí E.R. , Chen R. , Ciraldo I. , Colonna M. , D’Agostino G. , Delaunay F. , Deshmukh N. , Djapo H. , Geronimo G. De , Los Rios K. De , Ferraresi C. , Ferreira J.L. , Ferretti J. , Finocchiaro P. , Firat S. , Fisichella M. , Foti A. , Gallo G. , Garcia-Tecocoatzi H. , Hacisalihoglu A. , Huerta-Hernandez A. , Kotila Z.J. , Kucuk Y. , Iazzi F. , Lanzalone G. , Lay J.A. , Fauci L. La , Via F. La , Lenske H. , Linares R. , Presti D. Lo , Lubian J. , Ma J. , Marín-Lámbarri D. , Ruiz J. Mas , Medina N.H. , Mendes D. R. , Mereu P. , Moralles M. , Neri L. , Oliveira J.R.B. , Pakou A. , Pandola L. , Petrascu H. , Pietralla N. , Pinna F. , Reito S. , Ries P. , Rodrigues M.R.D. , Russo A. D. , Russo G. , Santopinto E. , Santos R.B.B. , Serbina L. , Sgouros O. , da Silveira M.A.G. , Solakci S.O. , Souliotis G. , Soukeras V. , Spatafora A. , Torresi D. , Tudisco S. , Hernandez H. Vargas , Vsevolodovna R.I.M. , Wang J.S. , Werner V. , Yang Y.Y. , Yildirin A. , Zagatto V.A.B. 
Published: December 2020

Abstract
The NUMEN project aims at accessing experimentally driven information on Nuclear Matrix Elements (NME) involved in the half-life of the neutrinoless double beta decay (0νββ). In this view measurements of Heavy Ion (HI) induced Double Charge Exchange (DCE) reaction cross sections are performed with high-accuracy. In particular, the (18O,18Ne) and (20Ne,20O) reactions are used as tools for β+β+ and β-β- decays, respectively. In the experiments, performed at INFN - Laboratory Nazionali del Sud (LNS) in Catania, the beams are accelerated by the Superconducting Cyclotron (CS) and the reaction ejectiles are detected the MAGNEX magnetic spectrometer. The measured cross sections are challengingly low (a few nb), being the total reaction cross section much larger (a few b), thus a high sensitivity and a large rejection capability are demanded to the experimental set-up. This limits the present exploration to few selected isotopes of interest in the context of typically low-yield experimental runs. A major upgrade of the LNS facility is under way in order to increase the experimental dataset of more than two orders of magnitude, still preserving the high sensitivity of the present set-up. When accomplished this effort will make the INFN-LNS as the state-of-the-art research infrastructure for the systematic study of all the cases of interest for 0νββ. In this view, frontiers technologies are going to be adopted for the accelerator and the detection systems. In parallel, advanced theoretical models are being developed in order to extract the nuclear structure information from the measured cross sections.
New features of the INCL model for spallation reactions
Authors: David J.-C. , Boudard A. , Cugnon J. , Hirtz J. , Leray S. , Mancusi D. , Rodriguez-Sanchez J. L. 
Published: December 2020

Abstract
The recent developments of the Liège intranuclear cascade model INCL are reviewed. The INCL4.6 version of this model was able when coupled with the ABLA07 de-excitation code, to describe rather well a huge set of experimental data in an incident energy range spanning between 200 MeV and 3 GeV, as it has been testified by an intercomparison of spallation codes organized by the IAEA. Since that time, the model has been implemented in several nuclear particle transport codes. Therefore, the possible applications of INCL have been enlarged to focus on diverse fields, and in the recent years, the model has been further developed to be applicable to these new issues and also to cope with remaining deficiencies. The new features include: i) a sophisticated dynamical model for light cluster emission (up to O ions), ii) the accommodation of light nuclei as projectiles, iii) a new procedure to take account of the fuzziness of the Fermi surface, and iv) an extension of the model to higher energy. The aim of this contribution is to present for the first time and to discuss the physics of the added features, and to give a hint about the performances of the new model.
Nuclear “diffuseness” probed by proton-nucleus diffraction
Authors: Horiuchi W. , Hatakeyama S. , Kohama A. 
Published: December 2020

Abstract
In this contribution, we propose a way to probe nuclear density profile, especially, nuclear surface diffuseness. We discuss the relationship between the nuclear surface diffuseness and the elastic scattering differential cross section at the first diffraction peak of high-energy nucleon-nucleus scattering as an efficient tool for extracting the nuclear surface information from limited experimental data involving short-lived unstable nuclei. The high-energy reaction is described by a reliable reaction theory, the Glauber model. Extending the idea of the black sphere diffraction model, we find that the nuclear radius and surface diffuseness are reflected in the proton-nucleus elastic scattering diffraction at the first peak position, that is, one can extract both the nuclear radius and diffuseness simultaneously, using the position of the first diffraction peak and its magnitude of the elastic scattering differential cross section. The reliability of this approach is confirmed by using realistic density distributions obtained by a microscopic mean-field model. The possibility of separating neutron and proton surfaces is also discussed.
Studying the Pygmy Dipole Resonances with isoscalar and isovector probes
Authors: Lanza E G , Vitturi A , Andrès M V 
Published: December 2020

Abstract
We present a short review of the properties of the so-called Pygmy Dipole Resonance (PDR) which can be studied with both isovector and isoscalar probes. This is possible due to the particular property of this new mode where the isoscalar and isovector characters are mixed. The use of both probes unveils new features which otherwise will remain hidden. It is of paramount importance the use of a proper description of these modes, taking into account their main features, in order to have a good description of the experimental data.
Scaling with deformation in probable p-wave halo 34Na
Authors: Manju  , Singh Jagjit , Shubhchintak  , Chatterjee R. 
Published: December 2020

Abstract
We investigate the electric dipole response of 34Na, a probable p-wave one-neutron halo nucleus, lying in the “island of inversion” and having a deformed structure. We use a semi-analytic approach to probe the dipole response and further compare the results obtained from a post form finite-range distorted wave Born approximation theory of Coulomb breakup. The effects of deformation are figured out on the peak positions of the electric dipole strength distribution which further constraint the one-neutron separation energy of the deformed projectile and it leads to a two-dimensional scaling of total B(E1) strength with parameters: separation energy and deformation.
Isospin equilibration phenomenon and mid-rapidity IMF emission in the
48Ca +27
Al 40 MeV/nucleon collision
Authors: Papa M , Acosta L , Cardella G , Filippo E De , Favela F , Geraci E , Gnoffo B , Lanzalone G , Maiolino C , Martorana N S , Pagano A , Pagano E V , Pirrone S , Politi G , Quattrocchi L , Rizzo F , Russotto P , Trifiro’ A , Trimarchi M 
Published: December 2020

Abstract
It is discussed the dynamics of Isospin equilibration in reactions involving the production of Intermediate Mass Fragment (IMF) in the mid-rapidity region. The investigation proceeds through the measurements of the reduced value of the total dipolar signal obtained from the measured velocities and charges of all fragments produced in the collision 48
Ca +27
Al at 40 MeV/nucleon. Preliminary experimental results, along with the comparison with CoMD-III model calculations for different density functionals related to the symmetry energy, are presented.
Fusion Hindrance and Pauli Blocking in 58Ni + 64Ni
Authors: Stefanini A.M. , Montagnoli G. , Fabbro M. Del , Colucci G. , Čolović P. , Corradi L. , Fioretto E. , Galtarossa F. , Goasduff A. , Grebosz J. , Heine M. , Jaworski G. , Mazzocco M. , Mijatovic T. , Szilner S. , Bajzek M. , Brugnara D. , Siciliano M. , Zanon I. 
Published: December 2020

Abstract

58Ni +64Ni is the first case where the influence of positive Q-value transfer channels on sub-barrier fusion was evidenced, in a very well known experiment by Beckerman et al., by comparing with the two systems 58Ni +58Ni and 64Ni +64Ni. Subsequent measurements on 64Ni +64Ni showed that fusion hindrance is clearly present in this case. On the other hand, no indication of hindrance can be observed for 58Ni +64Ni down to the measured level of 0.1 mb. In the present experiment the excitation function has been extended by two orders of magnitude downward. The cross sections for 58Ni + 64Ni continue decreasing very smoothly below the barrier, down to ≃1 μb. The logarithmic slope of the excitation function increases slowly, showing a tendency to saturate at the lowest energies. No maximum of the astrophysical S-factor is observed. Coupled-channels (CC) calculations using a Woods-Saxon potential and including inelastic excitations only, underestimate the sub-barrier cross sections by a large amount. Good agreement is found by adding two-neutron transfer couplings to a schematical level. This behaviour is quite different from what already observed for 64Ni+64Ni (no positive Q-value transfer channels available), where a clear low-energy maximum of the S-factor appears, and whose excitation function is overestimated by a standard Woods-Saxon CC calculation. No hindrance effect is observed in 58Ni+64Ni in the measured energy range. This trend at deep sub-barrier energies reinforces the recent suggestion that the availability of several states following transfer with Q >0, effectively counterbalances the Pauli repulsion that, in general, is predicted to reduce tunneling probability inside the Coulomb barrier.
Transfer to the continuum of 11Be with the application of ab-initio S-matrix
Authors: Carbone D , Bonaccorso A , Cappuzzello F , Cavallaro M , Hupin G , Navrátil P , Quaglioni S 
Published: December 2020

Abstract
The 9Be(18O,16O)11Be two-neutron transfer reaction at 84 MeV is measured at forward angles to explore the continuum of 11Be nucleus. Transfer-to-the-continuum (TC) reaction calculations are applied using for the first time an ab-initio S-matrix. It is derived from the ab-initio no-core shell model with continuum (NCSMC) method, recently used to describe the bound and continuum spectrum of 11Be. Previously known levels are confirmed and theoretical and experimental evidence for a 9/2+ state at Ex = 5.8 MeV is given, whose configuration is thought to be 10Be(2+) + n(d5/2).
The experiments to determine the electron capture and β-decay of 8B into the highly excited states of 8Be
Authors: Viñals S , Borge M J G , Tengblad O , Nácher E , Benito J , Figuera P , Fraile L M , Fynbo H O U , Gad A , Jensen J , Jonson B , Lica R , Marroquín I , Munch M , Nilsson T , Ovejas J D , Perea A , Riisager K , Smain S , Sotty C 
Published: December 2020

Abstract
The main goal of this work is to study the structure of the highest energy states in 8Be populated following the β+-decay and the electron capture (EC) of 8B. With this aim, two experiments were performed at ISOLDE-CERN in 2017 and 2018. The first experiment had the aim to resolve the 2+ doublet at 16.6 and 16.9 MeV, in order to study their isospin mixing. The second experiment aimed to determine a value or give an experimental upper limit to the branching ratio of the exotic EC-p decay.
In this paper, we present the experimental setups and we discuss the analysis and present the preliminary results obtained so far.
Effective mass and pairing gap in neutron matter
Authors: Palkanoglou G , Ismail N , Buraczynski M , Gezerlis A 
Published: December 2020

Abstract
Microscopic simulations of strongly correlated systems, such as neutron matter (NM), is restricted to a small number of particles due to various complexities. Thus, to understand the physics of infinite systems one has to consider the finite size effects (FSE) arising from these limitations on system size. These conference proceedings are centered around different ways of treating FSE in order to study NM. Specifically, we first present a preliminary study, at the mean field level and beyond, of FSE in the pairing gap of neutron superfluids. We also present a systematic model-independent extraction of the effective mass at various densities in NM using Quantum Monte Carlo (QMC) techniques.
High spin states in the heavy nucleus 208Pb and the coupling of one-particle one-hole states to platonic shapes
Authors: Heusler A 
Published: December 2020

Abstract
Structure, spin, and parity of states in 208Pb at 9 < Ex
< 17 MeV are explained by the weak coupling of the 3−, 4+, 6+ yrast, and the 12+ yrare states to one-particle one-hole yrast and yrare states. The spins of the particle and the hole are coupled in the stretched or nearly stretched mode. The ns-isomerism of three states is shown to derive from the exchange of an intruder hole and the p
1/2 hole.
Thouless-Valatin moment of inertia and removal of the spurious mode in the linear response theory
Authors: Kortelainen Markus 
Published: December 2020

Abstract
Symmetry breaking at the mean-field level leads to an appearance of a symmetry restoring Nambu-Goldstone (NG) mode in the linear response theory. These modes represent a special kind of collective motion of the system. However, they can interfere with the calculated intrinsic physical excitations and, hence, they are often called as spurious modes. I discuss translational and rotational NG mode and the inertia parameter associated with these modes, by using the finite amplitude method formalism. I will also discuss how to remove spurious mode from the calculated transition strength function.
Finite-range separable pairing interaction in Cartesian coordinates
Authors: Romero A. M. , Dobaczewski J. , Pastore A. 
Published: December 2020

Abstract
Within a simple SO(8) algebraic model, the coexistence between isoscalar and isovector pairing modes can be successfully described using a mean-field method plus restoration of broken symmetries. In order to port this methodology to real nuclei, we need to employ realistic density functionals in the pairing channel. In this article, we present an analytical derivation of matrix elements of a separable pairing interaction in Cartesian coordinates and we correct errors of derivations available in the literature. After implementing this interaction in the code HFODD, we study evolution of pairing gaps in the chain of deformed Erbium isotopes, and we compare the results with a standard density-dependent contact pairing interaction.
Structure of Krypton Isotopes using the Generalised Bohr Hamiltonian Method
Authors: Muir David , Próchniak Leszek , Pastore Alessandro , Dobaczewski Jacek 
Published: December 2020

Abstract
We investigate the properties of the excited spectra of the even-even isotopes of krypton using a Generalised Bohr Hamiltonian with three different Skyrme functionals. In particular, we investigate the evolution of the low-lying

2
1
+

and

4
1
+

states and their associated electromagnetic transitions. The model reproduces quite nicely the energy trends apart from 88Kr, where none of the interactions used here are able to grasp a sudden change in the energy spectrum. Additionally, we explore the neutron deficient region 72–76Kr which is a proposed region for shape coexistence. We observe that the model can reproduce the structure of the experimental spectrum of 72Kr exceedingly well.
Role of pair-vibrational correlations in forming the odd-even mass difference
Authors: Neergård Kai , Bentley Ian 
Published: December 2020

Abstract
In the random phase approximation (RPA)-amended Nilsson-Strutinskij method of calculating nuclear binding energies [1, 2], the conventional shell correction terms derived from the independent-nucleon model and the Bardeen-Cooper-Schrieffer pairing theory are supplemented by a term which accounts for the pair-vibrational correlation energy. This term is derived by means of the RPA from a pairing Hamiltonian which includes a neutron-proton pairing interaction. The method was used previously in studies of the pattern of binding energies of nuclei with approximately equal numbers N and Z of neutrons and protons and even mass number A = N + Z. Here it is applied to odd-A nuclei. Three sets of such nuclei are considered: (i) The sequence of nuclei with Z = N – 1 and 25 ⩽ A ⩽ 99. (ii) The odd-A isotopes of In, Sn, and Sb with 46 ⩽ N ⩽ 92. (iii) The odd-A isotopes of Sr, Y, Zr, Nb, and Mo with 60 ⩽ N ⩽ 64. The RPA correction is found to contribute significantly to the calculated odd-even mass differences, particularly in the light nuclei. In the upper sd shell this correction accounts for almost the entire odd-even mass difference for odd Z and about half of it for odd N. The size and sign of the RPA contribution varies, which is explained qualitatively in terms of a closed expression for a smooth RPA counter term.
Relativistic nuclear energy density functional approach to magnetic-dipole excitation
Authors: Oishi Tomohiro , Kružić Goran , Paar Nils 
Published: December 2020

Abstract
Magnetic-dipole (M1) excitations of 18O and 42Ca nuclei are investigated within a relativistic nuclear energy density functional framework. In our last work [1], these nuclei are found to have unique M1 excitation and its sum rule, because of their characteristic structure: the system consists of the shell-closure core plus two neutrons. For a more systematic investigation of the M1 mode, we have implemented a framework based on the relativistic nuclear energy density functional (RNEDF). For benchmark, we have performed the RNEDF calculations combined with the random-phase approximation (RPA). We evaluate the M1 excitation of 18O and 42Ca, whose sum-rule value (SRV) of the M1 transitions can be useful to test the computational implementation [1]. We also apply this RNEDF method to 208Pb, whose M1 property has been precisely measured [2, 3, 4, 5]. Up to the level of the M1 sum rule, our result is in agreement with the experiments, except the discrepancy related with the quenching factors for g coefficients.