Eur. Phys. J. A 13, 277-280 (2002)
New yrast excited states of the nucleus observed in deep inelastic reactionsZ. Liu1, Y.H. Zhang1, X.H. Zhou1, M.L. Liu1, W.J. Luo1, Q.Y. Pan1, Z.G. Gan1, T. Hayakawa2, M. Oshima2, Y. Toh2, T. Shizima2, Y. Hatsukawa2, A. Osa2, T. Ishii2 and M. Sugawara3
1 Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, PRC
2 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
3 Chiba Institute of Technology, Narashino, Chiba 275-0023, Japan
(Received: 2 November 2001 / Revised version: 15 January 2002 Communicated by J. Äystö)
Excited states of 142Ce, populated in deep inelastic reactions of 82 Se projectiles bombarding 139La target, have been studied up to medium spins using in-beam spectroscopy techniques. Three new levels have been identified at 2625, 2995, 3834 keV, and assigned as 8 + , 9 (-) and 11 (-), respectively. These new yrast states follow closely the level systematics of the even mass N=84 isotones. Their strctures have been discussed with the help of empirical shell model calculations.
21.60.Cs - Shell model.
23.20.Lv - Gamma transitions and level energies.
27.60.+j - .
© Società Italiana di Fisica, Springer-Verlag 2002