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New microsecond isomers in 189, 190Bi |
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| Authors: | AN Andreyev D Ackermann P Cagarda J Gerl FP Heßberger S Hofmann M Huyse A Keenan H Kettunen A Kleinböhl A Lavrentiev M Leino B Lommel M Matos G Münzenberg CJ Moore CD O'Leary RD Page S Reshitko S Saro C Schlegel H Schaffner MJ Taylor P Van Duppen L Weissman R Wyss |
| Institution: | (1) Institute of Experimental Physics, Warsaw University, ul.Hoża 69, 00-681 Warszawa, Poland, PL;(2) Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, B-3001 Heverlee, Belgium, BE;(3) Schuster Laboratory, Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK, GB;(4) Institut de Recherches Subatomiques UMR7500, CNRS-IN2P3 and Université Louis Pasteur, 67037 Strasbourg, France, FR;(5) Argonne National Laboratory, Argonne, IL 60439, USA, US |
| Abstract: | The 137I nucleus, populated in the spontaneous fission of 248Cm has been studied by means of prompt γ-ray spectroscopy using the EUROGAM2 array. Medium-spin yrast excitations in 137I were observed for the first time. The experimental level scheme is compared to the shell model calculation with modified Kuo-Herling interaction. The theoretical predictions differ significantly from the experimental results, indicating that the excitation pattern in 137I deviates significantly from the shell model scheme. Received: 6 June 2001 / Accepted: 4 October 2001 |
| Keywords: | PACS 23 20 Lv Gamma transitions and level energies – 21 60 Cs Shell model – 25 85 Ca Spontaneous fission – 27 60 +j 90 ?A? 149 |
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