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The European Physical Journal A
ISSN: 1434-6001 (printed version)
ISSN: 1434-601X (electronic version)
Abstract Volume 1 Issue 4 (1998) pp 391-397
nuclear structure: New isomeric states in 152,154,156Nd produced by spontaneous fission of 252Cf
C. Gautherin (1), M. Houry (1), W. Korten (1), Y. Le Coz (1), R. Lucas (1), X.H. Phan (1), C. Theisen (1), C. Badimon (2), G. Barreau (2), T.P. Doan (2), G. Pedemay (2), G. Bélier (3), M. Girod (3), V. Méot (3), S. Peru (3), A. Astier (4), L. Ducroux (4), M. Meyer (4), N. Redon (4)
(1) Commissariat à l'Energie Atomique de Saclay, DSM/DAPNIA/SPhN, F-91191 Gif sur Yvette Cedex, France
(2) Centre d'Etudes Nucléaires de Bordeaux-Gradignan, Domaine du Haut Vigneau, F-33175 Gradignan, France
(3) Commissariat à l'Energie Atomique de Bruyères-le-Châtel, DAM/SPN, BP12, F-91680 Bruyères-le-Châtel, France
(4) Institut de Physique Nucléaire de Lyon, F-69622 Villeurbanne Cedex, France
Received: 3 November 1997 / Revised version: 15 December 1997
Abstract: Isomeric states have been observed in fission-fragments produced by spontaneous fission of 252Cf. These states are found in neutron rich nuclei of different structure and deformations. About 50 isomeric nuclei have been observed using coincidences between <Gamma>-rays identified in EUROGAM II and fission fragments detected in photovoltaic cells (SAPhIR). Lifetimes in the range from 20 ns to 2µs have been measured. Presented calculations based on HFB +D1S force on new measured isomeric states in the 152,154,156Nd show evidence for K-isomers.
PACS: 25.85.-w Fission reactions - 21.10.-k Properties of nuclei; nuclear energy levels - 21.60.-n Nuclear-structure models and methods - 23.20.-g Electromagnetic transitions - 84.60.-h Direct energy conversion and storage
Communicated by B. Povh
Online publication: April 21, 1998
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