New information on the T1/2 = 47 s isomer in the 136I nucleus

W. Urban, M. Saha Sarkar, S. Sarkar, T. Rzaca-Urban, J. L. Durell, A. G. Smith, J. A. Genevey, J. A. Pinston, G. S. Simpson, I. Ahmad

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The 136I nucleus, populated in the spontaneous fission of 248Cm, was studied by means of prompt γ-ray spectroscopy using the EUROGAM2 array. The observation in this work of the 42.6keV prompt-γ, M1 + E2 transition de-exciting the 7- level in 136I indicates that this level, interpreted as the (π g7/2 3ν f7/2)7- configuration, does not correspond to the T = 47s, β-decaying isomer in 136I. The isomer is placed 42.6keV below the 7- level. It has spin 6- and is interpreted as the (π g7/22d5/2νf 7/2)6- configuration. This and other members of both multiplets can be reproduced properly only if one assumes that the πd 5/2 orbital in 136I is located 400keV lower than in 133Sb. Possible mechanisms causing this effect are discussed.
    Original languageEnglish
    Pages (from-to)257-262
    Number of pages5
    JournalEuropean Physical Journal A
    Volume27
    Issue number3
    DOIs
    Publication statusPublished - Mar 2006

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