Eur. Phys. J. A 13, 55-58 (2002)

Inelastic scattering on and disappearance of the magic number

H. Iwasaki¹, T. Motobayashi², H. Akiyoshi³, Y. Ando², N. Fukuda¹, H. Fujiwara², Zs. Fülöp³, K. I. Hahn³, Y. Higurashi², M. Hirai¹, I. Hisanaga², N. Iwasa⁴, T. Kijima², A. Mengoni^{3, 5}, T. Minemura², T. Nakamura⁶, M. Notani⁷, S. Ozawa², H. Sagawa⁸, H. Sakurai¹, S. Shimoura⁷, S. Takeuchi², T. Teranishi⁷, Y. Yanagisawa³ and M. Ishihara<sup>3

1</sup>  Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
²  Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima, Tokyo 171-8501, Japan
³  The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
⁴  Department of Physics, Tohoku University, Aza-Aoba, Aramaki, Aoba, Sendai, Miyagi 980-8578, Japan
⁵  ENEA, Applied Physics Division, Via Don Fiammelli 2, I-40129 Bologna, Italy
⁶  Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan
⁷  Center for Nuclear Study (CNS), University of Tokyo, RIKEN Campus, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
⁸  Center for Mathematical Sciences, the University of Aizu, Aizu-Wakamatsu, Fukushima 965-8580, Japan

iwasaki@rarfaxp.riken.go.jp

(Received: 1 May 2001 / Revised version: 26 June 2001)

Abstract
Experimental studies on in-beam -ray spectroscopy using a ¹²Be radioactive beam are presented. Inelastic scattering of the neutron-rich ¹²Be nucleus on ²⁰⁸Pb, ¹²C, and (CH ₂) _n targets has been studied by measuring de-excitation -rays in coincidence with scattered particles. The level schemes and transition probabilities are determined for low-lying excited states in ¹²Be. The present paper presents a brief review of the spectroscopic results, which may be associated with the N=8 shell quenching near the drip line.

PACS
21.10.Re - Collective levels.
23.20.-g - Electromagnetic transitions.
25.60.-t - Reactions induced by unstable nuclei.
27.20.+n - .

© Società Italiana di Fisica, Springer-Verlag 2002