bluuebunny/crossref_metadata_2025_split huggingface dataset:
Impact of error analysis on the composition the outer crust of a neutron star
Authors: Neill D , Medler K , Pastore A , Barton C 
Published: December 2020

Abstract
By means of bootstrap technique, we perform a full error analysis on the Duflo-Zucker mass model. We illustrate the impact of such study on the predicted chemical composition of the outer crust of a non-accreting neutron star. We define an existence probability for each nuclear species as a function of the depth of the crust. We observe that, due to statistical uncertainties, instead of having a well defined transition between two successive layers, we have a mixture of two species.
RIB studies for explosive scenarios and future opportunities at FRIB
Authors: Wrede C. 
Published: December 2020

Abstract
An accreting compact star in a binary system can generate periodic thermonuclear runaways on its surface. In the case of a white dwarf star, the result is a classical nova, which enriches the interstellar medium with newly synthesized nuclides. In the case of a neutron star, a detectable burst of X-rays is emitted. Nucleosynthesis and energy generation in these events depends on resonant thermonuclear reaction rates, which are especially challenging to measure directly in the laboratory when they involve radioactive reactants. Fortunately, the resonances can be discovered and their relevant properties can be constructed using nuclear structure experiments. We will describe a program of beta decay experiments the National Superconducting Cyclotron Laboratory to this end. In particular, the Gaseous Detector with Germanium Tagging (GADGET) system, developed to measure very weak low-energy beta delayed proton emission branches and gamma rays, is now operational. Recent results and future opportunities at the Facility for Rare Isotope Beams will be discussed.
High energy alpha particle emission as a challenging mechanism for synthesis of very heavy nuclei
Authors: Borcea C. , Penionzhkevich Yu. E. , Lukyanov S. 
Published: December 2020

Abstract
Two experiments made with the MSP144 stepped pole magnetic spectrometer of FLNR-JINR Dubna measured the energy spectra of α particles emitted at zero degree (collinear kinematic) in the reactions 40Ar(220 MeV) + 232Th and 48Ca(270 MeV) + 238U. The study was pursued up to the maximum energy the alpha particles may have in a two-body reaction, without excitation of the reaction partners, the so-called kinematic limit. The observed cross sections in the vicinity of the kinematic limits were of the order of μb. In the indicated reactions, the heavy partners of the recorded alpha particles in the exit channel were respectively 268Sg and 282Db. At the kinematic limit, the heavy partners have excitation energies close to zero, therefore a high probability to survive.
Influence of the curvature correction to the surface tension on nuclear fragmentation at intermediate energy head-on heavy ion collisions
Authors: Cherevko K. V. , Bulavin L. A. , Sysoev V. M. 
Published: December 2020

Abstract
Hydrodynamic model of the ”doughnut”-like structures formation in the head-on heavy ion collisions at intermediate energies is analyzed. Modification of the model is suggested to include the curvature correction to the surface tension coefficient. It is shown that accounting for the curvature correction changes the overall reaction time, maximum size of the system and the number of fragments. The results obtained show good correspondence with the results of the transport theory calculations and experimental data for the number of fragments and spreading size. The conducted analysis suggests that accounting for the curvature correction to the surface tension coefficient is essential when studying the dynamics of the system in the heavy ion collisions.
Sensitivity of one-neutron knockout of halo nuclei to their nuclear structure
Authors: Hebborn Chloê , Capel Pierre 
Published: December 2020

Abstract
Halo nuclei are located far from stability and exhibit a very peculiar structure. Due to their very short lifetime, they are often studied through reactions. Breakup reactions are of particular interest since their cross sections are large for these loosely-bound nuclei. Inclusive measurements of breakup–also called knockout reactions-have even higher statistics. In this proceeding, we study which nuclear-structure information can be inferred from the parallel-momentum distribution of the core of one-neutron halo nuclei after the knockout of its halo neutron. In particular, we analyse the influence of the ground-state wavefunction, the presence of excited states within the halo-nucleus spectrum and resonances in the core-neutron continuum. Our analysis shows that such observables are sensitive to the tail of the ground-state wavefunction. The presence of excited state decreases the breakup strength, and this flux is transferred to the inelastic-scattering channel. This indicates a conservation of the flux within each partial wave. We also show that the parallel-momentum distributions are insensitive to the existence of resonances within the continuum, they can thus be ignored in practice. This independence of the continuum argues that the parallel-momentum distributions are ideal observables to extract very precisely the ANCs of halo nuclei.
Alpha-particle production in the 6He+120Sn collision
Authors: Lichtenthäler R. , Appannababu S. , Alvarez M. A. G. , Rodríguez-Gallardo M. , Lépine-Szily A. , Pires K.C.C. , Santos O.C.B. , Umbelino U. , de Faria P.N. , Guimarães V. , Zevallos E.O.N. , Scarduelli V. , Assunção M. , Shorto J.M.B. , Barioni A. , Alcántara-Núñez J. , Morcelle V. , Serra A. 
Published: December 2020

Abstract
Alpha particle energy distributions in the 6He+120Sn collision have been measured at 7 bombarding energies above the Coulomb barrier. A phenomenological analysis of the centroids of the experimental distributions was performed and compared with the expected alpha-particle energies from breakup and neutron transfer reactions. Q-optimum conditions were determined using the Brinks formula for the di-neutron transfer reaction. A comparison of the measured alpha-particle production cross-sections with Continuum Discretized Coupled Channels (CDCC) calculations for breakup is presented.
Study of the scattering of 15C at energies around the Coulomb barrier
Authors: Ovejas J D , Knyazev A , Martel I , Tengblad O , Borge M J G , Cederkall J , Keeley N , Rusek K , García-Ramos C , Pérez T , Acosta L A , Arokiaraj A A , Babo M , Cap T , Ceylan N , Angelis G De , Pietro A Di , Fernández J P , Figuera P , Fraile L , Fynbo H , Galaviz D , Jensen J H , Jonson B , Kotak R , Kurtukian T , Madurga M , Marquínez-Durán G , Munch M , Orduz A K , Honório R , Pakou A , Peralta L , Perea A , Raabe R , Renaud M , Riisager K , Sánchez-Benítez A M , Sánchez-Segovia J , Sgouros O , Soukeras V , Teubig P , Viñals S , Wolinska-Cichocka M , Wolski R , Yang J 
Published: December 2020

Abstract
The neutron rich carbon isotope 15C is the only known case of an almost “pure” 2s1/2 single-neutron halo ground state configuration. At collision energies around the Coulomb barrier the reaction dynamics is expected to be dominated by single neutron transfer and breakup. To investigate these effects, we have measured the scattering of 15C with a 208Pb target at 65 MeV at the HIE-ISOLDE facility in CERN (Geneva, Switzerland). The preliminary data demonstrates the presence of a strong long-range absorption pattern in the angular distribution of the elastic cross section. The results are discussed in the framework of Optical Model calculations.
Direct processes for the systems 7Be,8B + 208Pb at Coulomb barrier energies
Authors: Mazzocco M , Keeley N , Boiano A , Boiano C , Commara M La , Lagni A , Manea C , Parascandolo C , Pierroutsakou D , Signorini C , Strano E , Torresi D , Yamaguchi H , Kahl D , Acosta L , Meo Di , Fernandez-Garcia J P , Glodariu T , Grebosz J , Guglielmetti A , Hirayama Y , Imai N , Ishiyama H , Iwasa N , Jeong S C , Jia H M , Kim Y H , Kimura S , Kubono S , Rana G La , Lin C J , Lotti P , Marquínez-Duran G , Martel I , Miyatake H , Mukai M , Nakao T , Nicoletto M , Pakou A , Rusek K , Sakaguchi Y , Sánchez-Benítez A M , Sava T , Sgouros O , Soukeras V , Soramel F , Stiliaris E , Stroe L , Teranishi T , Toniolo N , Wakabayashi Y , Watanabe Y X , Yang L , Yang Y Y , Zhang H Q 
Published: December 2020

Abstract
The elastic scattering process for the nuclear reactions induced by the Radioactive Ion Beams 7Be and 8B on a 208Pb target was measured for the first time in the energy range around the Coulomb barrier. Extensive theoretical calculations within the framework of the optical model were performed. An excellent agreement between experimental data and theoretical predictions was achieved for the reaction 7Be + 208Pb, while a comprehensive understanding of the reaction dynamics induced by the more exotic projectile 8B is still far to be reached. Predictions of the cross section for the breakup for both systems will also be given.
Reaction Theory and Advanced CDCC
Authors: Moro A.M. , Casal J. , Lei Jin , Gómez-Ramos M. 
Published: December 2020

Abstract
The Continuum-Discretized Coupled-Channels (CDCC) has been successfully employed to describe elastic and breakup of nuclear reactions induced by weakly bound projectiles. In this contribution, we review some other, less widespread applications of the CDCC wavefunction, some of them in combination with other reaction formalisms, which are being currently employed in the analysis of reactions involving three or more fragments in the initial or final state.
A clear signature of the breakup modes for 9Be on a proton target at 5.6 MeV/nucleon
Authors: Pakou A , Sgouros O , Soukeras V , Cappuzzello F , Acosta L , Agodi C , Boiano A , Calabrese S , Carbone D , Cavallaro M , Deshmukh N N , Foti A , Hacisalihoglou A , Keeley N , Commara M La , Martel I , Mazzocco M , Muoio A , Parascandolo C , Pierroutsakou D , Rusek K , Sanchez-Benítez A M , Santagati G , Souliotis G , Spatafora A , Strano E , Torresi D , Trzcinska A 
Published: December 2020

Abstract
The breakup of 9Be is studied via an inelastic scattering experiment on a proton target at 5.6 A MeV in inverse kinematics. Two of the three cluster constituents (α and α) as well as the proton target recoil were recorded in a triple coincidence mode allowing a full kinematics approach analysis. In this respect relative α - α and α - n, Q-value and 9Be excitation spectra, energy spectra for all fragments as well as the energy spectrum of the recoil proton were reconstructed. A clear signature of the two breakup sequential modes (5He + 4He and 8Be + n) was identified via the recoiling proton reconstructed spectra together with the direct breakup decay. A strong 5He + 4He mode was observed compatible with previous beta decay experiments.
An application of chiral forces with the semi-local regularization in momentum space to the deuteron photodisintegration process
Authors: Urbanevych V. , Golak J. , Skibiński R. , Witała H. 
Published: December 2020

Abstract
A recent paper by P. Reinert et al. [Eur. Phys. J. A54, 86 (2018)] showed a possibility of improving chiral nucleon-nucleon potential models by employing a semi-local regularization in momentum space. The authors derived nucleon-nucleon potentials with this kind of regularization completely up to the fifth order of the chiral expansion and considered additionally some contact interactions which appear at the sixth order. Such a chiral interaction has never been applied to study electromagnetic processes in two- or three-nucleon systems. Here we continue our research of photodisintegration processes, now using the improved chiral force. In particular, we discuss our predictions for the deuteron photodisintegration reaction in the photon energy range up to 100 MeV. The results of our calculations reveal that the new potential yields predictions characterized by a weaker dependence on the regularization parameter and faster convergence with respect to the chiral expansion order compared to the older chiral potentials.
Interplay between single particle and collective excitation in 49V
Authors: Bisoi Abhijit , Sapkota Y. , Adhikari A. , Gupta A. , Das A. , Ghosh H. , Rahaman R. , Sarkar S. , Pramanik D. , Das S. , Sharma S. , Ray S. , Dar S. , Nandi S. , Bhattacharya S. , Bhattacharjee T. , Mukherjee G. , Bhattacharyya S. , Samanta S. , Das S. , Chatterjee S. , Raut R. , Ghugre S. S. 
Published: December 2020

Abstract
High spin states of 49V populated through 48Ti(4He, 2np)49V reaction with 48 MeV 4He beam, have been studied using the Indian National Gamma Array (INGA) facility. The relative intensities, RDCO and polarization measurements have been carried out for a few transitions in 49V. The level lifetimes have been extracted for a few negative parity yrast levels using Doppler shift attenuation method. Large basis shell model calculations have been performed to understand the microscopic structure of these levels.
Mirror energy differences as a probe into neutron skin evolution
Authors: Boso A. , Lenzi S. M. , Recchia F. , Bonnard J. , Zuker A. P. 
Published: December 2020

Abstract
Experimental information on charge nuclear radii is limited to ground or isomeric states in stable nuclei; the measurement of neutron radii is even more challenging. In this contribution we present an innovative approach which gives direct insight into the nuclear radii of excited states from the study of Mirror energy differences (MED). MED are a direct consequence of isospin symmetry breaking and their study has proved to give precious information on different nuclear structure features. We report the results of an experiment performed in GANIL to study the MED in rotational bands in mirror nuclei 23Mg–23Na. State-of-the-art shell model calculations have been performed to interpret the data. This allowed to extract information on the evolution of the nuclear skin along excited states and its correlation with the difference between neutron and proton occupation numbers of the s1/2
orbital.
Experimental study of lifetimes of excited states in the Kπ = 0− octupole band and γ-vibrational band in 228Th
Authors: Chishti M.M.R. , O’Donnell D. , Battaglia G. , Bowry M. , Jaroszynski D.A. , Singh B.S. Nara , Scheck M. , Spagnoletti P. , Smith J. F. 
Published: December 2020

Abstract
Lifetimes of excited states in the Kπ
= 0− octupole band and γ-vibrational of 228Th have been measured using the fast timing setup at the University of the West of Scotland (UWS). The setup consists of two cerium doped LaBr3 fast scintillators placed equidistant from the radioactive source 232Th. The states of interest have been analysed by doing the triple γ – γ – time coincidence analysis and using the fast-timing technique, mirror-symmetric centroid difference method. Octupole collectivity in 228Th nucleus is also investigated by calculating the enhanced electric dipole moments and transition rates in excited states followed by lifetime measurements in octupole band.
Short-range correlations for 0νββ decay and low-momentum NN potentials
Authors: Coraggio L , Itaco N , Mancino R 
Published: December 2020

Abstract
We approach the calculation of the nuclear matrix element of the neutrinoless double-β decay process, considering the light-neutrino-exchange channel, by way of the realistic shell-model. In particular the focus of our work is spotted on the role of the short-range correlations, which should be taken into account because of the short-range repulsion of the realistic potentials. Our shell-model wave functions are calculated using an effective Hamiltonian derived from the high-precision CD-Bonn nucleon-nucleon potential, the latter renormalized by way of the so-called Vlow-k approach. The renormalization procedure decouples the repulsive high-momentum component of the potential from the low-momentum ones by the introduction of a cutoff Λ, and is employed to renormalize consistently the two-body neutrino potentials to calculate the nuclear matrix elements of candidates to this decay process in mass interval ranging from A = 76 up to A = 136. We study the dependence of the decay operator on the choice of the cutoff, and compare our results with other approaches that can be found in present literature.
Disentangling decaying isomers and searching for signatures of collective excitations in β decay
Authors: Guadilla V. , Fallot M. , Algora A. , Tain J. L. , Agramunt J. , Äystö J. , Briz J. A. , Cucoanes A. , Eronen T. , Estienne M. , Fraile L. M. , Ganioğlu E. , Gelletly W. , Gorelov D. , Hakala J. , Jokinen A. , Jordan D. , Kankainen A. , Kolhinen V. , Koponen J. , Lebois M. , Meur L. Le , Martinez T. , Monserrate M. , Montaner-Pizá A. , Moore I. , Nácher E. , Orrigo S. E. A. , Penttilä H. , Pohjalainen I. , Porta A. , Reinikainen J. , Reponen M. , Rinta-Antila S. , Rubio B. , Rytkönen K. , Shiba T. , Sonnenschein V. , Sonzogni A. A. , Valencia E. , Vedia V. , Voss A. , Wilson J. N. , Zakari-Issoufou A.-A. 
Published: December 2020

Abstract
In this contribution we summarize the recent study of the β decay of neutron-rich nuclei with isomeric states close in energy to the ground states. The disentanglement of each pair of β-decaying states was achieved by applying different strategies and using the purification capabilities of the JYFLTRAP double Penning trap system at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. The Total Absorption γ-ray Spectroscopy technique was employed to determine the β intensity probabilities populating the excited states in the daughter nuclei. Previously undetected β intensity was found and we have already evaluated the impact of part of these results on reactor summation calculations. The possibility to populate states associated with the Pygmy Dipole Resonance in the β decay of 96gsY has also been investigated thanks to the sensitivity of our technique to high-lying strength in the daughter nuclei.
Tetrahedral intrinsic structure of Oxygen-16 revisited
Authors: Halcrow C J , Manton N S 
Published: December 2020

Abstract
A model for vibrational and rotational excitations of an intrinsic tetrahedral structure of the Oxygen-16 nucleus has been investigated, building on classic work of Wheeler, Dennison and Robson. Tetrahedral A- and F-phonons are treated harmonically, but the E-phonon dynamics is extended to dynamics on an E-manifold of configurations of four α-particles. This allows for tunnelling between the tetrahedral configuration and its dual, through a square configuration, and lifts the parity doubling that would otherwise occur. Unlike in earlier models, including the algebraic cluster model, the E-phonon frequency is taken to be about half the F-phonon frequency, which in turn is about half the A-phonon frequency. As a result, the first-excited 0+ state is a 2-phonon, E-manifold excitation, whereas the lowest 2+ and 2− states are 1-phonon, E-manifold excitations. Coriolis contributions to the rotational energy of states with F-phonons are significant. Altogether, rotational bands are constructed based on vibrational states with up to four phonons, and with spin/parity up to 9−. Nearly all the observed states of Oxygen-16 are accommodated, up to 20 MeV and partly beyond. Predictions for some so far unobserved states, especially those of unnatural parity, are made.
Momentum Distributions and Short-Range Correlations in Few-Nucleon Systems Using Realistic Interactions
Authors: Marcucci Laura Elisa , Viviani Michele 
Published: December 2020

Abstract
We present predictions for the single-nucleon and spin-isospin projected two-nucleon momentum distributions in 3H and 3He, obtained using phenomenological potentials, as well as the most recent high-quality chiral nucleon-nucleon potentials, with and without three-nucleon force. Three-nucleon interaction contributions as well as chiral order-by-order convergence are briefly discussed. An outlook for further studies is also presented.
How to Improve Functionals in Density Functional Theory? —Formalism and Benchmark Calculation—
Authors: Naito Tomoya , Ohashi Daisuke , Liang Haozhao 
Published: December 2020

Abstract
We proposed in Ref. [J. Phys. B 39, 13120 (2019)] a way to improve energy density functionals in the density functional theory based on the combination of the inverse Kohn-Sham method and the density functional perturbation theory. In this proceeding, we mainly focus on the results for the Ar and Kr atoms.
Signatures of octupole shape phase transitions in radioactive nuclei
Authors: Nomura Kosuke 
Published: December 2020

Abstract
We analyze the octupole deformations and the related collective excitations in medium-heavy and heavy nuclei based on the microscopic framework of the nuclear energy density functional theory. Constrained self-consistent mean-field calculation with a given energy density functional is performed to provide for each nucleus a potential energy surface with axial quadrupole and octupole shape degrees of freedom. Spectroscopic properties are computed by means of the interacting-boson Hamiltonian, which is determined by mapping the fermionic potential energy surface onto the bosonic counterpart. The overall systematics of the calculated spectroscopic observables exhibit phase transitional behaviors between stable octupole deformation and octupole vibration characteristic of the octupole-soft potential within the set of nuclei in light actinide and rare-earth regions, Th, Ra, Sm, Gd, and Ba isotopes, where octupole shapes are most likely to occur.
Collectivity of the electromagnetic transitions in near-threshold resonances
Authors: Płoszajczak M. , Okołowicz J. 
Published: December 2020

Abstract
Mixing of the shell model (SM) eigenstates due to the coupling via the common decay channel influences leads in many cases to the formation of a collective eigenstate which carries many features of the nearby decay channel. This generic mechanism in open quantum systems explains the phenomenological Ikeda diagram and generalizes it for various clusters/correlations in the vicinity of the respective cluster decay thresholds. The near-threshold collectivization of the SM states may also influence their electromagnetic decays. We discuss this phenomenon on the example of B(Eλ) decays of near-threshold 2+ states in 14C.
Exploring the tension between nature and the Standard Model: the muon g-2
Authors: Marinković M Krstić , Cardoso N 
Published: December 2020

Abstract
Anomalous magnetic moment of the muon (muon g-2) is one of the most precisely measured quantities in particle physics. At the same time, it can be evaluated in the Standard Model with an unprecedented accuracy. The Muon g-2 experiment at Fermilab has started the major data collection and the aimed four-fold increase in precision will shed light on the current discrepancy between the theory prediction and the measured value. This renders a comparable improvement of the precision in the SM theory an essential ingredient in order to fully exploit the expected increase of precision in experimental results. For all these reasons, the muon g-2 is considered to be a great testing ground for new physics.
Hadronic contributions are the dominant sources of uncertainty in the theoretical prediction of the muon g-2. A reciprocal effort to a precise determination of the leading hadronic contribution to the muon g-2 using lattice gauge theories is a direct measurement of the hadronic contributions to the running of the fine structure constant recently proposed by the MUonE experiment. A hybrid strategy including both experimental and lattice data sets is expected to give an independent check of the dispersive results from e+e-annihilation, which dominate the current world average.
Process-independent effective coupling and the pion structure function
Authors: Rodríguez-Quintero José , Chang Lei , Raya Khépani , Roberts Craig D. 
Published: December 2020

Resumen
We sketch the calculation of the pion structure functions within the DSE framework, following two alternative albeit consistent approaches, and discuss then their QCD evolution, the running driven by an effective charge, from a hadronic scale up to any larger one accessible to experiment.