2018 Impact factor 2.481
Hadrons and Nuclei
Eur. Phys. J. A 1, 391-397

New isomeric states in 152,154,156Nd produced by spontaneous fission of 252Cf

C. Gautherin1 - M. Houry1 - W. Korten1 - Y. Le Coz1 - R. Lucas1 - X.H. Phan1 - Ch. Theisen1 - Ch. Badimon2 - G. Barreau2 - T.P. Doan2 - G. Pedemay2 - G. Bélier3 - M. Girod3 - V. Méot3 - S. Peru3 - A. Astier4 - L. Ducroux4 - M. Meyer4 - N. Redon4

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 Communicated by B. Povh

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 2$\mu$s 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


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