Abstract
An isomeric state at 3,523 keV excitation energy in97Y with a half-life of 144(10) ms has been discovered with the fission-product separator JOSEF. This isomer is depopulated through aγ transition of 162 keV. AnE3 multipolarity for this transition is consistent with the measured conversion coefficients ofα K =0.98(20) andα T =1.00(19). Subsequent electromagnetic transitions populate several new97Y levels which have high spins. For the isomer the three-quasiparticle configuration [πg 9/2⊗ν(h 11/2,g 7/2)]27/2− is proposed. TheE3 transition with a strength about 2 single-particle units is supposed to be of the typeh 2/+111 →d 2/−15 . These findings provide evidence for the rapid shape transition atA≃100 since they indicate shell-model character of 9739 Y58 even at high excitation energies while the immediate neighbour 9839 Y59 contains a rotational band based on a level at 495 keV.
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The authors acknowledge with pleasure fruitful discussions with Profs. J. Blomqvist, O.W.B. Schult and with Drs. P. Kleinheinz and L.K. Peker. They appreciate the support in the course of the measurements by Drs. H. Lawin, G. Menzen and Messrs. W. Borgs, A Jeglorz and R. Seidemann. Thanks are due to Mrs. H. Paffen for carefully writing the manuscript.