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Nuclear Theory·nucl-th

Monday·February 2, 2026

10 papers—3 primary·7 cross-listed

All10Primary3Cross-lists7
  1. 01

    Low-energy 17O(n,g)18O reaction within the microscopic potential model and its role for the weak r-process

    Nguyen Le Anh · Jasmine Sarahi Andrews · Bui Minh Loc · Andre Sieverding

    The neutron radiative capture reaction O(n,)18O plays a pivotal role in both nuclear structure studies and astrophysical nucleosynthesis, particularly in the formation of elements during hydrostatic and explosive stellar environments. We calculated the O(n,)O cross section within the Skyrme Hartree-Fock potential model and analyzed electric dipole E1 transitions to both positive and negative-parity states below the alpha-decay threshold in O. Our cross sections are significantly different from the data available in commonly used libraries. We further investigate the impact of the new calculated cross section on weak r-process nucleosynthesis using large-scale reaction network calculations across a wide range of electron fractions and entropies. Our results show that the O(n, )O reaction rate significantly influences the production of first r-process peak elements, such as strontium, under specific astrophysical conditions. This study highlights the importance of accurate nuclear dat$ for light isotopes in modeling heavy-element synthesis and provides updated reaction rates for future nucleosynthesis simulations.

    nucl-thPRC(2026)·0 citations
  2. 02

    Enhanced Yield Rate of \textsuperscript{229m}Th via Cascade Decay in Storage Rings and Electron Beam Ion Traps

    Yumiao Wang · Yi Yang · Yixin Li · Ding Yue · Kai Zhao · Youjing Wang · Changbo Fu · Yugang Ma

    The low-energy nuclear isomeric state of \textsuperscript{229m}Th provides a unique bridge between nuclear and atomic physics, enabling applications such as nuclear clocks and precision metrology. However, efficient and controllable production of \textsuperscript{229m}Th remains a major experimental challenge. We propose an efficient scheme to produce the Th in storage rings (SRs) and electron beam ion traps (EBITs), using a cascade decay pathway. Highly charged ions are excited to higher nuclear states via nuclear excitation by inelastic electron scattering (NEIES) and nuclear excitation by electron capture (NEEC), followed by radiative or internal conversion cascades that populate the isomer. Our calculations demonstrate that, under typical SRs and EBITs conditions, optimized indirect excitation pathways significantly enhance \textsuperscript{229m}Th production rate. In particular, NEIES can provide an enhancement of up to four orders of magnitude through cascade de-excitation at high energies, while NEEC can contribute an additional enhancement of up to several tens of times. Such a significant increase in the \textsuperscript{229m}Th yield rate would facilitate its application in various nuclear photonics fields, especially in the development of atomic nuclear clocks.

    nucl-thphysics.atom-phPRC(2026)·2 citations
  3. 03

    as a probe of spin and vorticity in heavy-ion collisions

    In Woo Park🇰🇷 · Beomkyu Kim🇰🇷 · Giorgio Torrieri🇧🇷 · Kayman J. Gonçalves🇧🇷 · Sanghoon Lim🇰🇷 · Su Houng Lee🇰🇷

    The correlation between vorticity and spin alignment in heavy-ion collisions can be probed through polarization measurements of hadrons, whose total spin originates from both constituent-quark spins and orbital angular momentum in the quark-model framework. To motivate such experimental studies, we calculate the general angular distribution of produced pion in using interaction Lagrangian and helicity formalism and check that both methods yield the same result. The distribution is given as a function of angle between pion and initial quantization axis of and the spin density matrix element of . Its diagonal entries and component were computed assuming local thermal equilibrium and blast wave model for different centrality classes, hence given as a function of azimuthal angle with respect to the impact parameter.

    nucl-thnucl-ex0 citations

Affiliations

first authorsco-authorsvia INSPIRE