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Title: Neutron and weak-charge distributions of the 48Ca nucleus

Abstract

What is the size of the atomic nucleus? This deceivably simple question is difficult to answer. Although the electric charge distributions in atomic nuclei were measured accurately already half a century ago, our knowledge of the distribution of neutrons is still deficient. In addition to constraining the size of atomic nuclei, the neutron distribution also impacts the number of nuclei that can exist and the size of neutron stars. We present an ab initio calculation of the neutron distribution of the neutron-rich nucleus 48Ca. We show that the neutron skin (difference between the radii of the neutron and proton distributions) is significantly smaller than previously thought. We also make predictions for the electric dipole polarizability and the weak form factor; both quantities that are at present targeted by precision measurements. Here, based on ab initio results for 48Ca, we provide a constraint on the size of a neutron star.

Authors:
 [1];  [1]; ORCiD logo [2];  [1];  [3];  [1];  [1];  [4];  [5];  [6];  [7];  [7];  [8];  [9];  [10];  [7];  [7]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Physics Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Physics Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy; Chalmers Univ. of Technology, Göteborg (Sweden). Dept. of Fundamental Physics
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Physics Division; Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy and NSCL/FRIB; Univ. of Warsaw, Pasteura, Warsaw (Poland). Faculty of Physics
  4. TRIUMF, Vancouver, British Columbia (Canada); Univ. of Manitoba, Winnipeg, Manitoba (Canada). Dept. of Physics and Astronomy
  5. Hebrew Univ., Jerusalem (Israel). Racah Inst. of Physics
  6. Chalmers Univ. of Technology, Göteborg (Sweden). Dept. of Fundamental Physics
  7. Technische Univ. Darmstadt, Darmstadt, (Germany). Inst. für Kernphysik; GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt (Germany). ExtreMe Matter Institute (EMMI)
  8. Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy and NSCL/FRIB; Univ. of Oslo, Oslo (Norway). Dept. of Physics
  9. TRIUMF, Vancouver, British Columbia (Canada); Univ. of British Columbia, Vancouver, British Columbia (Canada). Dept. of Physics and Astronomy
  10. Univ. degli Studi di Trento, Trento (Italy). Dipartimento di Fisica; Trento Inst. for Fundamental Physics and Applications (TIFPA), Trento (Italy). Inst. Nazionale di Fisica Nucleare,
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1242672
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 12; Journal Issue: 2; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; computational astrophysics; nuclear physics; theoretical nuclear physics

Citation Formats

Hagen, G., Ekström, A., Forssén, C., Jansen, G. R., Nazarewicz, W., Papenbrock, T., Wendt, K. A., Bacca, S., Barnea, N., Carlsson, B., Drischler, C., Hebeler, K., Hjorth-Jensen, M., Miorelli, M., Orlandini, G., Schwenk, A., and Simonis, J. Neutron and weak-charge distributions of the 48Ca nucleus. United States: N. p., 2015. Web. doi:10.1038/nphys3529.
Hagen, G., Ekström, A., Forssén, C., Jansen, G. R., Nazarewicz, W., Papenbrock, T., Wendt, K. A., Bacca, S., Barnea, N., Carlsson, B., Drischler, C., Hebeler, K., Hjorth-Jensen, M., Miorelli, M., Orlandini, G., Schwenk, A., & Simonis, J. Neutron and weak-charge distributions of the 48Ca nucleus. United States. doi:10.1038/nphys3529.
Hagen, G., Ekström, A., Forssén, C., Jansen, G. R., Nazarewicz, W., Papenbrock, T., Wendt, K. A., Bacca, S., Barnea, N., Carlsson, B., Drischler, C., Hebeler, K., Hjorth-Jensen, M., Miorelli, M., Orlandini, G., Schwenk, A., and Simonis, J. Mon . "Neutron and weak-charge distributions of the 48Ca nucleus". United States. doi:10.1038/nphys3529. https://www.osti.gov/servlets/purl/1242672.
@article{osti_1242672,
title = {Neutron and weak-charge distributions of the 48Ca nucleus},
author = {Hagen, G. and Ekström, A. and Forssén, C. and Jansen, G. R. and Nazarewicz, W. and Papenbrock, T. and Wendt, K. A. and Bacca, S. and Barnea, N. and Carlsson, B. and Drischler, C. and Hebeler, K. and Hjorth-Jensen, M. and Miorelli, M. and Orlandini, G. and Schwenk, A. and Simonis, J.},
abstractNote = {What is the size of the atomic nucleus? This deceivably simple question is difficult to answer. Although the electric charge distributions in atomic nuclei were measured accurately already half a century ago, our knowledge of the distribution of neutrons is still deficient. In addition to constraining the size of atomic nuclei, the neutron distribution also impacts the number of nuclei that can exist and the size of neutron stars. We present an ab initio calculation of the neutron distribution of the neutron-rich nucleus 48Ca. We show that the neutron skin (difference between the radii of the neutron and proton distributions) is significantly smaller than previously thought. We also make predictions for the electric dipole polarizability and the weak form factor; both quantities that are at present targeted by precision measurements. Here, based on ab initio results for 48Ca, we provide a constraint on the size of a neutron star.},
doi = {10.1038/nphys3529},
journal = {Nature Physics},
number = 2,
volume = 12,
place = {United States},
year = {2015},
month = {11}
}

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