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Title: Peeling Off Neutron Skins from Neutron-Rich Nuclei: Constraints on the Symmetry Energy from Neutron-Removal Cross Sections

Abstract

An experimentally constrained equation of state of neutron-rich matter is fundamental for the physics of nuclei and the astrophysics of neutron stars, mergers, core-collapse supernova explosions, and the synthesis of heavy elements. To this end, we investigate the potential of constraining the density dependence of the symmetry energy close to saturation density through measurements of neutron-removal cross sections in high-energy nuclear collisions of 0.4 to 1 GeV / nucleon. We show that the sensitivity of the total neutron-removal cross section is high enough so that the required accuracy can be reached experimentally with the recent developments of new detection techniques. Because of this, we quantify two crucial points to minimize the model dependence of the approach and to reach the required accuracy: the contribution to the cross section from inelastic scattering has to be measured separately in order to allow a direct comparison of experimental cross sections to theoretical cross sections based on density functional theory and eikonal theory. The accuracy of the reaction model should be investigated and quantified by the energy and target dependence of various nucleon-removal cross sections. Our calculations explore the dependence of neutron-removal cross sections on the neutron skin of medium-heavy neutron-rich nuclei, and wemore » demonstrate that the slope parameter L of the symmetry energy could be constrained down to ± 10 MeV by such a measurement, with a 2% accuracy of the measured and calculated cross sections.« less

Authors:
 [1];  [2];  [3];  [1]
  1. Technische Univ. Darmstadt, Darmstadt, (Germany). Inst. fur Kernphysik; GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  2. Texas A & M Univ., College Station, TX (United States); Univ. Darmstadt, Darmstadt, (Germany). Inst. fur Kernphysik
  3. Technische Univ. Darmstadt, Darmstadt, (Germany). Inst. fur Kernphysik
Publication Date:
Research Org.:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1415054
Alternate Identifier(s):
OSTI ID: 1498992
Grant/Contract Number:  
FG02-08ER41533
Resource Type:
Journal Article: Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 119; Journal Issue: 26; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Aumann, T., Bertulani, C. A., Schindler, F., and Typel, S. Peeling Off Neutron Skins from Neutron-Rich Nuclei: Constraints on the Symmetry Energy from Neutron-Removal Cross Sections. United States: N. p., 2017. Web. doi:10.1103/physrevlett.119.262501.
Aumann, T., Bertulani, C. A., Schindler, F., & Typel, S. Peeling Off Neutron Skins from Neutron-Rich Nuclei: Constraints on the Symmetry Energy from Neutron-Removal Cross Sections. United States. doi:10.1103/physrevlett.119.262501.
Aumann, T., Bertulani, C. A., Schindler, F., and Typel, S. Thu . "Peeling Off Neutron Skins from Neutron-Rich Nuclei: Constraints on the Symmetry Energy from Neutron-Removal Cross Sections". United States. doi:10.1103/physrevlett.119.262501.
@article{osti_1415054,
title = {Peeling Off Neutron Skins from Neutron-Rich Nuclei: Constraints on the Symmetry Energy from Neutron-Removal Cross Sections},
author = {Aumann, T. and Bertulani, C. A. and Schindler, F. and Typel, S.},
abstractNote = {An experimentally constrained equation of state of neutron-rich matter is fundamental for the physics of nuclei and the astrophysics of neutron stars, mergers, core-collapse supernova explosions, and the synthesis of heavy elements. To this end, we investigate the potential of constraining the density dependence of the symmetry energy close to saturation density through measurements of neutron-removal cross sections in high-energy nuclear collisions of 0.4 to 1 GeV / nucleon. We show that the sensitivity of the total neutron-removal cross section is high enough so that the required accuracy can be reached experimentally with the recent developments of new detection techniques. Because of this, we quantify two crucial points to minimize the model dependence of the approach and to reach the required accuracy: the contribution to the cross section from inelastic scattering has to be measured separately in order to allow a direct comparison of experimental cross sections to theoretical cross sections based on density functional theory and eikonal theory. The accuracy of the reaction model should be investigated and quantified by the energy and target dependence of various nucleon-removal cross sections. Our calculations explore the dependence of neutron-removal cross sections on the neutron skin of medium-heavy neutron-rich nuclei, and we demonstrate that the slope parameter L of the symmetry energy could be constrained down to ± 10 MeV by such a measurement, with a 2% accuracy of the measured and calculated cross sections.},
doi = {10.1103/physrevlett.119.262501},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 26,
volume = 119,
place = {United States},
year = {2017},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/physrevlett.119.262501

Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

Figures / Tables:

Figure 1 Figure 1: Nucleon-nucleon (top) and total reaction cross sections for 12C on 12C (bottom) as a function of beam energy. The blue points display data from Refs. [26] (100 to 400 MeV=nucleon), [27] (790 MeV=nucleon), and [28] (950 MeV=nucleon). Black triangles display the result from a parameter-free eikonal calculation inmore » the optical limit, while the red diamonds include the effect of Pauli blocking [29].« less

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Works referenced in this record:

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    Works referencing / citing this record:

    Strange quark matter and compact stars
    journal, March 2005


    The Skyrme interaction in finite nuclei and nuclear matter
    journal, April 2007


    The Physics of Neutron Stars
    journal, April 2004


    The Nuclear Equation of State and Neutron Star Masses
    journal, November 2012


    Glauber Modeling in High-Energy Nuclear Collisions
    journal, November 2007


      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.