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Nuclear Theory·nucl-th

Monday·August 15, 2022

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 05

    Constraints on neutron skin thickness and nuclear deformations using relativistic heavy-ion collisions from STAR

    Haojie Xu (for the STAR Collaboration)🇨🇳

    In these proceedings, we present the measurements of neutron skin thickness and nuclear deformation using isobar Ru+Ru and Zr+Zr collisions at GeV by the STAR detector. The significant deviations from unity of the isobar ratios of elliptic flow , triangular flow , mean fluctuations , and asymmetric cumulant indicate large differences in their quadrupole and octuple deformations. The significant deviations of the isobar ratios of produced hadron multiplicity , mean transverse momentum , and net charge number indicate a halo-type neutron skin for the Zr nucleus, much thicker than for the Ru nucleus, consistent with nuclear structure calculations. We discuss how we extract the neutron skin thickness, the symmetry energy slope parameter, and deformation parameters from data.

    ↳ nucl-exnucl-thActa Phys.Polon.Supp.(2023)·15 citations
  2. 06

    The Influence of Beta Decay Rates on r-Process Observables

    Kelsey A. Lund · J. Engel · G.C. McLaughlin · M.R. Mumpower · E.M. Ney · R. Surman

    The rapid neutron capture process (r-process) is one of the main mechanisms whereby elements heavier than iron are synthesized, and is entirely responsible for the natural production of the actinides. Kilonova emissions are modeled as being largely powered by the radioactive decay of species synthesized via the r -process. Given that the r -process occurs far from nuclear stability, unmeasured beta decay rates play an essential role in setting the time scale for the r -process. In an effort to better understand the sensitivity of kilonova modeling to different theoretical global beta-decay descriptions, we incorporate these into nucleosynthesis calculations. We compare the results of these calculations and highlight differences in kilonova nuclear energy generation and light curve predictions, as well as final abundances and their implications for nuclear cosmochronometry. We investigate scenarios where differences in beta decay rates are responsible for increased nuclear heating on time scales of days that propagates into a significantly increased average bolometric luminosity between 1-10 days post-merger. We identify key nuclei, both measured and unmeasured, whose decay rates are directly impact nuclear heating generation on timescales responsible for light curve evolution. We also find that uncertainties in beta decay rates significantly impact ages estimates from cosmochronometry.

    ↳ astro-ph.HEastro-ph.SRnucl-exnucl-thApJ(2023)·31 citations

Affiliations

first authorsco-authorsvia INSPIRE