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Nuclear Theory·nucl-th

Wednesday·November 24, 2021

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 01

    [Submitted on 22 Nov 2021]

    Decision Theory for the Mass Measurements at the Facility for Rare Isotope Beams

    Jesse N. Farr · Zach Meisel · Andrew W. Steiner

    Nuclear physics facilities, like the Facility for Rare Isotope Beams (FRIB), can potentially perform many nuclear mass measurements of exotic isotopes. Each measurement comes with a particular cost, both in time and money, and thus it is important to establish which mass measurements are the most informative. In this article, we show that one can use the Kullback-Leibler divergence to determine the information gained by a mass measurement. We model the information gain obtained by nuclear mass measurements from two perspectives: first from the perspective of theoretical nuclear mass models, and the second from the perspective of r-process nucleosynthesis. While this work specifically analyzes the abilities of FRIB, other facilities worldwide could benefit from a similar use of information gain in order to decide which experiments are optimal.

    Comments:
    7 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2111.11536 [pdf]
    4 citations
  2. 02

    [Submitted on 23 Nov 2021]

    Variational and parquet-diagram calculations for neutron matter. IV. Spin-orbit interactions and linear response

    E. Krotscheck · J. Wang

    We develop the parquet-diagram summation method for neutron matter interacting via potentials that include spin, tensor, and spin-orbit components. For that purpose, we derive an exact expression for the sum of all ring-diagrams in terms effective local particle-hole interactions involving the above four operators. The parquet equations are closed by deriving the spin-orbit contribution to that particle-hole interaction. We show that many-body correlations screen the bare spin-orbit potential considerably, and the corrections of that screened spin-orbit potential to the other three interaction channels are quite small. We apply our method to the calculation of the response of neutron matter to density and both longitudinal and transverse spin-dependent external fields.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2111.12051 [pdf]
    PRC(2022)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE