Neutron skin and signature of the $N$ = 14 shell gap found from measured proton radii of $^{17-22}$N
| Autor: | A. Evdokimov, J. Atkinson, Hooi Jin Ong, Gaute Hagen, S. Pietri, F. Farinon, Yu. A. Litvinov, S. Bagchi, M. Marta, Branislav Sitar, A. Prochazka, Satbir Kaur, M. Mostazo, M. Takechi, Hans Geissel, Satoru Terashima, I. Dillmann, I. G. Mukha, C. Scheidenberger, R. Kanungo, J. Kurcewicz, R. Janik, G. Guastalla, A. Estrade, Y.K. Tanaka, J. Vargas, D. Cortina-Gil, J. S. Winfield, T. D. Morris, Isao Tanihata, S. R. Stroberg, Helmut Weick, T. Suzuki, Peter Strmen, Junki Tanaka, F. Ameil, Wataru Horiuchi, R. Knöbel, C. Nociforo, Yassid Ayyad |
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| Přispěvatelé: | Geesaman, D. F. |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Nuclear and High Energy Physics
Proton Nuclear Theory Ab initio Shell (structure) FOS: Physical sciences 01 natural sciences Nuclear Theory (nucl-th) Nuclear physics Root mean square 0103 physical sciences ddc:530 Neutron Nuclear Experiment (nucl-ex) 010306 general physics Nuclear Experiment Magic number (physics) Physics Isotope 010308 nuclear & particles physics lcsh:QC1-999 Physics::Accelerator Physics Halo lcsh:Physics |
| Zdroj: | Physics Letters B, Vol 790, Iss, Pp 251-256 (2019) Physics letters / B B 790, 251-256 (2019). doi:10.1016/j.physletb.2019.01.024 |
| Popis: | A thick neutron skin emerges from the first determination of root mean square radii of the proton distributions for $^{17-22}$N from charge changing cross section measurements around 900$A$ MeV at GSI. Neutron halo effects are signaled for $^{22}$N 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. 18 pages, 3 figures |
| Databáze: | OpenAIRE |
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