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- W2046875750 abstract "Medium-spin, yrast excitations in the 138Cs nucleus, populated in the spontaneous fission of 248Cm, were observed for the first time. 138Cs was studied by means of prompt γ-ray spectroscopy using the EUROGAM2 array. The newly observed yrast cascade, built on the known 6- isomer at 80 keV, was successfully described by shell model calculations. Analogously to the 136I isotone, the 6- isomer in 138Cs has the $ensuremath{(pi g_{7/2} ^4 d_{5/2} nu f_{7/2})_{6^-}}$ dominating configuration and the 7- excitation, located 175 keV above, corresponds to the $ensuremath{(pi g_{7/2} ^3 d_{5/2}^2 nu f_{7/2})_{7^-}}$ as dominating configuration. Similarly as in 136I, changing the position of the d 5/2 proton orbital improves the reproduction of the data. However, in 138Cs the energy of this orbital should be increased compared to its energy in 133Sb, to get the best description, in contrast to 136I and 135Sb, where it had to be decreased. The best reproduction of excitation energies in 138Cs is obtained assuming that the πd 5/2 orbital in 138Cs is located about 100 keV higher than in 133Sb. These observations suggest that the lowering of the d 5/2 s.p. energy in 135Sb is not a physical effect due to the appearance of a neutron skin, as proposed by other authors, but rather an artifact due to some deficiency of the input data used in the shell model calculations in the region of the doubly magic 132Sn core." @default.
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- W2046875750 date "2007-04-01" @default.
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- W2046875750 title "First observation of medium-spin excitations in the 138Cs nucleus" @default.
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