Neutron skins as laboratory constraints on properties of neutron stars and on what we can learn from heavy ion fragmentation reactions

Bertulani, C. A.; Valencia, J.

doi:10.1103/physrevc.100.015802

Neutron skins as laboratory constraints on properties of neutron stars and on what we can learn from heavy ion fragmentation reactions

Journal Article · Mon Jul 15 00:00:00 EDT 2019 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.100.015802· OSTI ID:1609970

Bertulani, C. A. ^[1]; Valencia, J. ^[2]

Texas A & M Univ., Commerce, TX (United States); Technische Univ. Darmstadt (Germany); DOE/OSTI
Texas A & M Univ., Commerce, TX (United States)

The equation of state (EOS) of infinite nuclear matter with a small proton or neutron fraction is a crucial input to determine the properties of neutron stars and compare model predictions to astronomical observations. The so-called symmetry energy is the part of the EOS accounting for the difference in the number of neutrons and protons. Numerous experiments have been devised to assess the symmetry energy and constrain its functional dependence with the nucleon density. Further constraints follow from a stellar modeling using the EOS to reproduce astronomical observations such as neutron star masses and radii. Here, the recent detection of gravitational waves emitted from neutron star mergers and the nucleosynthesis ensuing from these events caused a surge of interest for such studies. Several types of nuclear reactions have been proposed to study the symmetry energy part of the EOS. Some of them consist in determining the neutron skin in nuclei and exploit its correlation with the slope parameter of the symmetry energy. In this article, we explore a particular set of reactions using high-energy (E_lab ~ 1 GeV/nucleon) neutron-rich projectiles. We explore measurements of all reaction fragments (a) in the same isotopic chain, i.e., only by removal of neutrons, (b) in all charge-changing channels, and (c) total interaction cross sections. Using Hartree-Fock-Bogoliubov (HBF) predictions for neutron and proton densities with Skyrme interactions, we explore the sensitivity of these cross sections with the neutron skin in nuclei.

View Accepted Manuscript (DOE)

Research Organization:: Texas A & M Univ., Commerce, TX (United States)

Sponsoring Organization:: U.S. National Science Foundation; USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-08ER41533

OSTI ID:: 1609970

Alternate ID(s):: OSTI ID: 1546441

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 100; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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