Physics Letters B (Mar 2019)
Neutron skin and signature of the N = 14 shell gap found from measured proton radii of 17−22N
- 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
Affiliations
- S. Bagchi
- Astronomy and Physics Department, Saint Mary's University, Halifax, NS B3H 3C3, Canada; GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany; Justus-Liebig University, 35392 Giessen, Germany
- R. Kanungo
- Astronomy and Physics Department, Saint Mary's University, Halifax, NS B3H 3C3, Canada; TRIUMF, Vancouver, BC V6T 4A3, Canada; Corresponding author.
- W. Horiuchi
- Department of Physics, Hokkaido University, Sapporo 060-0810, Japan
- G. Hagen
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
- T.D. Morris
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA; Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA
- S.R. Stroberg
- TRIUMF, Vancouver, BC V6T 4A3, Canada
- T. Suzuki
- Department of Physics, Nihon University, Setagaya-ku, Tokyo 156-8550, Japan
- F. Ameil
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- J. Atkinson
- Astronomy and Physics Department, Saint Mary's University, Halifax, NS B3H 3C3, Canada
- Y. Ayyad
- Universidad de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
- D. Cortina-Gil
- Universidad de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
- I. Dillmann
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- A. Estradé
- Astronomy and Physics Department, Saint Mary's University, Halifax, NS B3H 3C3, Canada; GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- A. Evdokimov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- F. Farinon
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- H. Geissel
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany; Justus-Liebig University, 35392 Giessen, Germany
- G. Guastalla
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- R. Janik
- Faculty of Mathematics and Physics, Comenius University, 84215 Bratislava, Slovakia
- S. Kaur
- Astronomy and Physics Department, Saint Mary's University, Halifax, NS B3H 3C3, Canada; Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS B3H 4R2, Canada
- R. Knöbel
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- J. Kurcewicz
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- Yu.A. Litvinov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- M. Marta
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- M. Mostazo
- Universidad de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
- I. Mukha
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- C. Nociforo
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- H.J. Ong
- RCNP, Osaka University, Mihogaoka, Ibaraki, Osaka 567 0047, Japan
- S. Pietri
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- A. Prochazka
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- C. Scheidenberger
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany; Justus-Liebig University, 35392 Giessen, Germany
- B. Sitar
- Faculty of Mathematics and Physics, Comenius University, 84215 Bratislava, Slovakia
- P. Strmen
- Faculty of Mathematics and Physics, Comenius University, 84215 Bratislava, Slovakia
- M. Takechi
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- J. Tanaka
- RCNP, Osaka University, Mihogaoka, Ibaraki, Osaka 567 0047, Japan
- Y. Tanaka
- Astronomy and Physics Department, Saint Mary's University, Halifax, NS B3H 3C3, Canada; GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany; Justus-Liebig University, 35392 Giessen, Germany
- I. Tanihata
- RCNP, Osaka University, Mihogaoka, Ibaraki, Osaka 567 0047, Japan; School of Physics and Nuclear Energy Engineering and IRCNPC, Beihang University, Beijing 100191, China
- S. Terashima
- School of Physics and Nuclear Energy Engineering and IRCNPC, Beihang University, Beijing 100191, China
- J. Vargas
- Universidad de Santiago de Compostela, E-15706 Santiago de Compostela, Spain
- H. Weick
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- J.S. Winfield
- GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
- Journal volume & issue
-
Vol. 790
pp. 251 – 256
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. Keywords: Proton and matter radii, Neutron skin, Magic number, Shell model, Ab initio theory, Radioactive beams
