Deformation-driven p-wave halos at the drip line: 31Ne

T Nakamura; N Kobayashi; Y Kondo; Y Satou; J A Tostevin; Y Utsuno; N Aoi; H Baba; N Fukuda; J Gibelin; N Inabe; M Ishihara; D Kameda; T Kubo; T Motobayashi; T Ohnishi; N A Orr; H Otsu; T Otsuka; H Sakurai; T Sumikama; H Takeda; E Takeshita; M Takechi; S Takeuchi; Y Togano; K Yoneda

doi:10.1103/PhysRevLett.112.142501

Deformation-driven p-wave halos at the drip line: 31Ne

Phys Rev Lett. 2014 Apr 11;112(14):142501. doi: 10.1103/PhysRevLett.112.142501. Epub 2014 Apr 7.

Authors

T Nakamura¹, N Kobayashi¹, Y Kondo¹, Y Satou², J A Tostevin³, Y Utsuno⁴, N Aoi⁵, H Baba⁵, N Fukuda⁵, J Gibelin⁶, N Inabe⁵, M Ishihara⁵, D Kameda⁵, T Kubo⁵, T Motobayashi⁵, T Ohnishi⁵, N A Orr⁶, H Otsu⁵, T Otsuka⁷, H Sakurai⁵, T Sumikama⁸, H Takeda⁵, E Takeshita⁵, M Takechi⁵, S Takeuchi⁵, Y Togano⁹, K Yoneda⁵

Affiliations

¹ Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan.
² Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan and Department of Physics and Astronomy, Seoul National University, 599 Gwanak, Seoul 151-742, Republic of Korea.
³ Department of Physics, University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
⁴ Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan.
⁵ RIKEN Nishina Center, Hirosawa 2-1, Wako, Saitama 351-0198, Japan.
⁶ LPC-ENSICAEN, IN2P3-CNRS et Université de Caen, F-14050, Caen Cedex, France.
⁷ Center for Nuclear Study (CNS), the University of Tokyo, Hongo, Tokyo 113-0033, Japan.
⁸ Department of Physics, Tokyo University of Science, Chiba 278-8510, Japan.
⁹ Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551, Japan and RIKEN Nishina Center, Hirosawa 2-1, Wako, Saitama 351-0198, Japan.

PMID: 24765946
DOI: 10.1103/PhysRevLett.112.142501

Abstract

The halo structure of 31Ne is studied using 1n-removal reactions on C and Pb targets at 230 MeV/nucleon. A combined analysis of the cross sections of these nuclear and Coulomb dominated reactions that feed directly the 30Ne ground-state reveals 31Ne to have a small neutron separation energy, 0.15(-0.10)(+0.16) MeV, and spin-parity 3/2-. Consistency of the data with reaction and large-scale shell-model calculations identifies 31Ne as deformed and having a significant p-wave halo component, suggesting that halos are more frequent occurrences at the neutron drip line.