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

doi:10.1016/j.physletb.2019.01.024

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. KnöbelJ. 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

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43 Scopus citations

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.

Original language	English
Pages (from-to)	251-256
Number of pages	6
Journal	Physics Letters B
Volume	790
DOIs	https://doi.org/10.1016/j.physletb.2019.01.024
State	Published - Mar 10 2019

Funding

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.

Keywords

Ab initio theory
Magic number
Neutron skin
Proton and matter radii
Radioactive beams
Shell model

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10.1016/j.physletb.2019.01.024

Cite this

Bagchi, S., Kanungo, R., Horiuchi, W., Hagen, G., Morris, T. D., Stroberg, S. R., Suzuki, T., Ameil, F., Atkinson, J., Ayyad, Y., Cortina-Gil, D., Dillmann, I., Estradé, A., Evdokimov, A., Farinon, F., Geissel, H., Guastalla, G., Janik, R., Kaur, S., ... Winfield, J. S. (2019). Neutron skin and signature of the N = 14 shell gap found from measured proton radii of ¹⁷⁻²²N. Physics Letters B, 790, 251-256. https://doi.org/10.1016/j.physletb.2019.01.024

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title = "Neutron skin and signature of the N = 14 shell gap found from measured proton radii of 17−22N",

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 = "Ab initio theory, Magic number, Neutron skin, Proton and matter radii, Radioactive beams, Shell model",

author = "S. Bagchi and R. Kanungo and W. Horiuchi and G. Hagen and Morris, \{T. D.\} and Stroberg, \{S. R.\} and T. Suzuki and F. Ameil and J. Atkinson and Y. Ayyad and D. Cortina-Gil and I. Dillmann and A. Estrad{\'e} and A. Evdokimov and F. Farinon and H. Geissel and G. Guastalla and R. Janik and S. Kaur and R. Kn{\"o}bel and J. Kurcewicz and Litvinov, \{Yu A.\} and M. Marta and M. Mostazo and I. Mukha and C. Nociforo and Ong, \{H. J.\} and S. Pietri and A. Prochazka and C. Scheidenberger and B. Sitar and P. Strmen and M. Takechi and J. Tanaka and Y. Tanaka and I. Tanihata and S. Terashima and J. Vargas and H. Weick and Winfield, \{J. S.\}",

note = "Publisher Copyright: {\textcopyright} 2019 The Authors",

year = "2019",

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doi = "10.1016/j.physletb.2019.01.024",

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Bagchi, S, Kanungo, R, Horiuchi, W, Hagen, G , Morris, TD, Stroberg, SR, Suzuki, T, Ameil, F, Atkinson, J, Ayyad, Y, Cortina-Gil, D, Dillmann, I, Estradé, A, Evdokimov, A, Farinon, F, Geissel, H, Guastalla, G, Janik, R, Kaur, S, Knöbel, R, Kurcewicz, J, Litvinov, YA, Marta, M, Mostazo, M, Mukha, I, Nociforo, C, Ong, HJ, Pietri, S, Prochazka, A, Scheidenberger, C, Sitar, B, Strmen, P, Takechi, M, Tanaka, J, Tanaka, Y, Tanihata, I, Terashima, S, Vargas, J, Weick, H & Winfield, JS 2019, 'Neutron skin and signature of the N = 14 shell gap found from measured proton radii of ¹⁷⁻²²N', Physics Letters B, vol. 790, pp. 251-256. https://doi.org/10.1016/j.physletb.2019.01.024

TY - JOUR

T1 - Neutron skin and signature of the N = 14 shell gap found from measured proton radii of 17−22N

AU - Bagchi, S.

AU - Kanungo, R.

AU - Horiuchi, W.

AU - Hagen, G.

AU - Morris, T. D.

AU - Stroberg, S. R.

AU - Suzuki, T.

AU - Ameil, F.

AU - Atkinson, J.

AU - Ayyad, Y.

AU - Cortina-Gil, D.

AU - Dillmann, I.

AU - Estradé, A.

AU - Evdokimov, A.

AU - Farinon, F.

AU - Geissel, H.

AU - Guastalla, G.

AU - Janik, R.

AU - Kaur, S.

AU - Knöbel, R.

AU - Kurcewicz, J.

AU - Litvinov, Yu A.

AU - Marta, M.

AU - Mostazo, M.

AU - Mukha, I.

AU - Nociforo, C.

AU - Ong, H. J.

AU - Pietri, S.

AU - Prochazka, A.

AU - Scheidenberger, C.

AU - Sitar, B.

AU - Strmen, P.

AU - Takechi, M.

AU - Tanaka, J.

AU - Tanaka, Y.

AU - Tanihata, I.

AU - Terashima, S.

AU - Vargas, J.

AU - Weick, H.

AU - Winfield, J. S.

PY - 2019/3/10

Y1 - 2019/3/10

N2 - 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.

AB - 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.

KW - Ab initio theory

KW - Magic number

KW - Neutron skin

KW - Proton and matter radii

KW - Radioactive beams

KW - Shell model

UR - https://www.scopus.com/pages/publications/85060447278

U2 - 10.1016/j.physletb.2019.01.024

DO - 10.1016/j.physletb.2019.01.024

M3 - Article

AN - SCOPUS:85060447278

SN - 0370-2693

VL - 790

SP - 251

EP - 256

JO - Physics Letters B

JF - Physics Letters B

ER -