Eur. Phys. J. A 13, 277-280 (2002)

Note

New yrast excited states of the nucleus observed in deep inelastic reactions

Z. 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. Sugawara<sup>3

1</sup>  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)

Abstract
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.

PACS
21.60.Cs - Shell model.
23.20.Lv - Gamma transitions and level energies.
27.60.+j - .

© Società Italiana di Fisica, Springer-Verlag 2002