2018 Impact factor 2.481
Hadrons and Nuclei


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

Inelastic scattering on $\chem{^{12}Be}$ and disappearance of the $\mth{N=8}$ 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. Mengoni3, 5, T. Minemura2, T. Nakamura6, M. Notani7, S. Ozawa2, H. Sagawa8, H. Sakurai1, S. Shimoura7, S. Takeuchi2, T. Teranishi7, Y. Yanagisawa3 and M. Ishihara3

1  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 $\gamma$-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 $\gamma$-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 - $6\leq A\leq 19$ .

© Società Italiana di Fisica, Springer-Verlag 2002