A high spin isomer in 153Eu
J.M. Chatterjee1 - Somapriya Basu-Roy1 - S.S. Ghugre3 - S. Chattopadhyay1 - R.P. Singh4 - G.O. Rodrigues4 - R.K. Chattopadhyay2 - R.K. Bhowmik4
1 Saha Institute of Nuclear Physics. 1/AF Bidhannagar, Calcutta
2 A. M. College, 102/1 Amherst Street, Calcutta-700009, India.
IUC-DAEF, LB Block, Bidhannagar, Calcutta 700091, India.
3 Nuclear Science Centre, Aruna Asaf Ali Marg, New Delhi 110067, India.
Received: 22 April 1997 / Revised version: 26 September 1997
A search for new isomers of nanosecond lifetimes were carried out in 153Eu via the 150Nd(7Li,xn) reaction. The single particle angular momentum alignment and dynamical moment of inertia estimated from the experimental data indicate a configuration change at rotational energy 0.30 MeV. A decrease of B(E2) values is also observed at the same frequency. An isomeric level is identified at an excitation energy of 3100 keV (J=35/2-) which corresponds to this frequency. The lifetime of the level is found to be 8.6 1.3 nanosecond.
23.20.Lv Gamma transitions and level energies - 21.10.Tg Lifetimes - 27.70.+q