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

C. Gautherin; M. Houry; W. Korten; Y. Le Coz; R. Lucas; X.H. Phan; Ch. Theisen; Ch. Badimon; G. Barreau; T.P. Doan; G. Pedemay; G. Bélier; M. Girod; V. Méot; S. Peru; A. Astier; L. Ducroux; M. Meyer; N. Redon

doi:doi:10.1007/s100500050074

2021 Impact factor 3.131

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