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Nuclear Theory·nucl-th

Thursday·September 5, 2024

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    Structure of odd-mass Ne, Na, and Mg nuclei

    Z. H. Sun · T. R. Djärv · G. Hagen · G. R. Jansen · T. Papenbrock

    The island of inversion is a region of neutron-rich nuclei that are deformed in their ground states. In this region, less is known about the energy levels of odd-mass nuclei, how they evolve with increasing neutron numbers, and how they can be organized into rotational bands. We perform {\it ab initio} coupled-cluster calculations of spectra in odd-mass Ne, Na, and Mg nuclei based on an interaction of chiral effective field theory. Our results confirm some tentative spin and parity assignments, predict the structure of nuclei near the neutron dripline, and inform us about rotational bands in this region of the nuclear table.

    nucl-thPRC(2025)·12 citations
  2. 02

    Deformation probes for light nuclei in their collisions at relativistic energies

    Hai-Cheng Wang🇨🇳 · Song-Jie Li🇨🇳 · Lu-Meng Liu🇨🇳 · Jun Xu🇨🇳 · Zhong-Zhou Ren🇨🇳

    We have investigated the performance of anisotropic flows , transverse momentum fluctuations , and their correlations in central collisions at relativistic energies as probes of deformation parameters of colliding nuclei, if these nuclei are light nuclei with large and different configurations of clusters. The effects from higher-order terms are illustrated by derived relations based on the overlap of two nuclei with uniform density distributions and by dynamic simulations of collisions of heavy nuclei whose density distributions are of a deformed Woods-Saxon (WS) form. While the linear relations between , , and and that between and can be violated for extremely large , they are mostly valid for realistic values of , as long as the density distribution of colliding nuclei can be described by a deformed WS form. However, these linear relations are generally not valid with more realistic density distributions of light nuclei with clusters, and the amount of deviation depends on the detailed -cluster configurations. Care must be taken when one tries to extract the deformation of light nuclei, and specific probes for -cluster structures in these nuclei are very much needed.

    nucl-thhep-exnucl-exPRC(2024)·14 citations
  3. 03

    Calculation of The Abundance of Re-Os Nuclear Clock Nuclides in S-process and Sensitivity Analysis of Maxwellian-Averaged Neutron Capture Cross Sections

    Xinyu Dong · Yixuan Qiu · Kaisu Wu

    In this paper, the network equations calculation of Re-Os clock-related nuclide abundance in s-process is studied, and the sensitivities of Maxwellian-Averaged neutron capture cross sections for each nuclide are analyzed in detail. Firstly, basing nuclear physical parameters, we give the branching s-process reaction network from W to Os, and establish the corresponding network equations. Using a single path s-process approximation, we obtain an analytical expression of the seed nuclide W abundance of our branching network. Because of the stiffness of the system of network equations, we use the semi-implicit Runge-Kutta method to give the numerical solution of the network equations, and thus obtain the abundance of each nuclide related to the Re-Os nuclear clock in the s-process. Finally, with the numerical solution, the sensitivity analysis of the Maxwellian-Averaged neutron capture cross sections of the nuclear reaction involved in the Re-Os nuclear clock network equations is carried out. Therefore, we find that in s-process, the neutron capture reaction W + n W has the greatest influence on the Re-Os nuclear clock reaction network, and the neutron capture reaction W + n W has the greatest effect on the particular nuclides Re and Os. So the measurements of these two Maxwellian-Averaged neutron capture cross sections deserve the attention of experimental nuclear physicists.

    nucl-thEPJA(2025)·0 citations
  4. 04

    Fission of Hg and Fm: a comparative study

    Bernard Remi🇫🇷 · Simenel Cedric🇦🇺 · Blanchon Guillaume🇫🇷 · Lau Ngee-Wein🇦🇺 · McGlynn Patrick🇦🇺

    Hg is experimentally found to fission asymmetrically. This result was not expected as a naive fragment shell effects study would support the symmetric mode to be the most probable. In the present study we investigate both symmetric and asymmetric Hg fission modes at the mean field level using various multipole moment constraints. Potential energy surfaces are analysed in terms of shell effects that shape their topographies and connections to fragment shell effects are made. The non-occurrence of low energy symmetric fission is interpreted in terms of Zr fragment properties. Throughout this study a comparison with Fm and its symmetric doubly magic Sn fission fragments is done.

    nucl-thEPJA(2024)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE