Proton radii of (12-17)B define a thick neutron surface in ¹⁷B

A Estradé; R Kanungo; W Horiuchi; F Ameil; J Atkinson; Y Ayyad; D Cortina-Gil; I Dillmann; A Evdokimov; F Farinon; H Geissel; G Guastalla; R Janik; M Kimura; 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; Y Suzuki; M Takechi; J Tanaka; I Tanihata; S Terashima; J Vargas; H Weick; J S Winfield

doi:10.1103/PhysRevLett.113.132501

Proton radii of (12-17)B define a thick neutron surface in ¹⁷B

Phys Rev Lett. 2014 Sep 26;113(13):132501. doi: 10.1103/PhysRevLett.113.132501. Epub 2014 Sep 23.

Authors

A Estradé¹, R Kanungo², W Horiuchi³, F Ameil⁴, J Atkinson², Y Ayyad⁵, D Cortina-Gil⁵, I Dillmann⁴, A Evdokimov⁴, F Farinon⁴, H Geissel⁶, G Guastalla⁴, R Janik⁷, M Kimura³, R Knöbel⁴, J Kurcewicz⁴, Yu A Litvinov⁴, M Marta⁴, M Mostazo⁵, I Mukha⁴, C Nociforo⁴, H J Ong⁸, S Pietri⁴, A Prochazka⁴, C Scheidenberger⁶, B Sitar⁷, P Strmen⁷, Y Suzuki⁹, M Takechi⁴, J Tanaka⁸, I Tanihata¹⁰, S Terashima¹¹, J Vargas⁵, H Weick⁴, J S Winfield⁴

Affiliations

¹ Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3 H 3C3, Canada and GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany.
² Astronomy and Physics Department, Saint Mary's University, Halifax, Nova Scotia B3 H 3C3, Canada.
³ Department of Physics, Hokkaido University, Sapporo 060-0810, Japan.
⁴ GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany.
⁵ Universidad de Santiago de Compostela, E-15706 Santiago de Compostella, Spain.
⁶ GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany and Justus-Liebig University, 35392 Giessen, Germany.
⁷ Faculty of Mathematics and Physics, Comenius University, 84215 Bratislava, Slovakia.
⁸ RCNP, Osaka University, Mihogaoka, Ibaraki, Osaka 567 0047, Japan.
⁹ Department of Physics, Niigata University, Niigata 950-2181, Japan and RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
¹⁰ RCNP, Osaka University, Mihogaoka, Ibaraki, Osaka 567 0047, Japan and School of Physics and Nuclear Energy Engineering and IRCNPC, Beihang University, Beijing 100191, People's Republic of China.
¹¹ School of Physics and Nuclear Energy Engineering and IRCNPC, Beihang University, Beijing 100191, People's Republic of China.

PMID: 25302882
DOI: 10.1103/PhysRevLett.113.132501

Abstract

The first determination of radii of point proton distribution (proton radii) of (12-17)B from charge-changing cross sections (σ(CC)) measurements at the FRS, GSI, Darmstadt is reported. The proton radii are deduced from a finite-range Glauber model analysis of the σ(CC). The radii show an increase from ¹³B to ¹⁷B and are consistent with predictions from the antisymmetrized molecular dynamics model for the neutron-rich nuclei. The measurements show the existence of a thick neutron surface with neutron-proton radius difference of 0.51(0.11) fm in ¹⁷B.