Neutron skin and signature of the N = 14 shell gap found from measured proton radii of 17−22N
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ISSN: 0370-2693
E-ISSN: 1873-2445
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Abstract
A thick neutron skin emerges from the first determination of root mean square radii of the proton distributions for 17−22N from charge changing cross section measurements around 900A MeV at GSI. Neutron halo effects are signalled for 22N from an increase in the proton and matter radii. The radii suggest an unconventional shell gap at N = 14 arising from the attractive proton–neutron tensor interaction, in good agreement with shell model calculations. Ab initio, in-medium similarity re-normalization group, calculations with a state-of-the-art chiral nucleon–nucleon and three-nucleon interaction reproduce well the data approaching the neutron drip-line isotopes but are challenged in explaining the complete isotopic trend of the radii.
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S. Bagchi, R. Kanungo, W. Horiuchi, G. Hagen, T.D. Morris, S.R. Stroberg, T. Suzuki, F. Ameil, J. Atkinson, Y. Ayyad, D. Cortina-Gil, I. Dillmann, A. Estradé, A. Evdokimov, F. Farinon, H. Geissel, G. Guastalla, R. Janik, S. Kaur, R. Knöbel, J. Kurcewicz, Yu.A. Litvinov, M. Marta, M. Mostazo, I. Mukha, C. Nociforo, H.J. Ong, S. Pietri, A. Prochazka, C. Scheidenberger, B. Sitar, P. Strmen, M. Takechi, J. Tanaka, Y. Tanaka, I. Tanihata, S. Terashima, J. Vargas, H. Weick, J.S. Winfield, Neutron skin and signature of the N = 14 shell gap found from measured proton radii of 17−22N, Physics Letters B, Volume 790, 2019, Pages 251-256, ISSN 0370-2693, https://doi.org/10.1016/j.physletb.2019.01.024.
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https://doi.org/10.1016/j.physletb.2019.01.024Sponsors
The authors are thankful for the support of the GSI accelerator staff and the FRS technical staff for an efficient running of the experiment. The support from NSERC, Canada for this work is gratefully acknowledged. The support of the PR China government and Beihang University under the Thousand Talent program is gratefully acknowledged. The experiment work is partly supported by the grant-in-aid program of the Japanese government under the contract number 23224008. This work is partly supported by Grants-in-Aid for Scientific Research (JP15K05090) of the JSPS of Japan. It is supported by the Office of Nuclear Physics, U.S. Department of Energy (Oak Ridge National Laboratory), DE-SC0008499 (NUCLEI SciDAC collaboration), NERRSC Grant No. 491045-2011, and the Field Work Proposal ERKBP57 at Oak Ridge National Laboratory. Computer time was provided by the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) program. TRIUMF receives funding via a contribution through the National Research Council Canada. This research used resources of the Oak Ridge Leadership Computing Facility located in the Oak Ridge National Laboratory, which is supported by the Office of Science of the Department of Energy under Contract No. DE-AC05-00OR22725, and used computational resources of the National Center for Computational Sciences and the National Institute for Computational Sciences. The authors thank B. Davids for a careful reading of the manuscript.
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