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 \((\ensuremath \pi g_{7/2}^3 \nu f_{7/2})_{7^-}\) 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 \(\ensuremath(\pi g_{7/2}^2 d_{5/2} \nu f_{7/2})_{6^-}\) configuration. This and other members of both multiplets can be reproduced properly only if one assumes that the πd5/2 orbital in 136I is located 400keV lower than in 133Sb. Possible mechanisms causing this effect are discussed.
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D. Schwalm
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Urban, W., Saha Sarkar, M., Sarkar, S. et al. New information on the T1/2 = 47 s isomer in the 136I nucleus. Eur. Phys. J. A 27, 257–262 (2006). https://doi.org/10.1140/epja/i2005-10273-1
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DOI: https://doi.org/10.1140/epja/i2005-10273-1