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The European Physical Journal A
ISSN: 1434-6001 (printed version)
ISSN: 1434-601X (electronic version)
Abstract Volume 1 Issue 1 (1998) pp 55-59
A high spin isomer in 153Eu
J.M. Chatterjee (1), S. Basu-Roy (1), S.S. Ghugre (3), S. Chattopadhyay (1), R.P. Singh (4), G.O. Rodrigues (4), R.K. Chattopadhyay (2), R.K. Bhowmik (4)
(1) Saha Institute of Nuclear Physics. 1/AF Bidhannagar, Calcutta 700064, India
(2) A. M. College, 102/1 Amherst Street, Calcutta-700009, India
(3) IUC-DAEF, LB Block, Bidhannagar, Calcutta 700091, India
(4) Nuclear Science Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
Received: 22 April 1997 / Revised version: 26 September 1997
Abstract. A search for new isomers of nanosecond lifetimes were carried out in 153Eu via the 150Nd(7Li,xn<Gamma>) reaction. The single particle angular momentum alignment and dynamical moment of inertia estimated from the experimental data indicate a configuration change at rotational energy {\hslash}<omega> \sim 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<pi>=35/2-) which corresponds to this frequency. The lifetime of the level is found to be 8.6 ± 1.3 nanosecond.
PACS: 23.20.Lv Gamma transitions and level energies - 21.10.Tg Lifetimes - 27.70.+q 150 \leq A \leq 189
Communicated by B. Herskind
Online publication: January 23, 1998
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