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

Physics

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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.

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

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

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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, Section B: Nuclear, Elementary Particle and High-Energy Physics, 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",

month = mar,

day = "10",

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

language = "English",

volume = "790",

pages = "251--256",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

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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, Section B: Nuclear, Elementary Particle and High-Energy Physics, 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 - http://www.scopus.com/inward/record.url?scp=85060447278&partnerID=8YFLogxK

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, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

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

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Keywords

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