Acta Physica Polonica B

Vol. 32, No. 3, March 2001, page 1005

Recoil Isomer Tagging on Proton-Rich Odd--Odd N=77 Isotones 142Tb and 144Ho

C. Scholey, D.M. Cullen, E.S. Paul, M.A. Bentley, A.J. Boston, A.M. Bruce, P.A. Butler, M. Caamano, O. Dorvaux, T. Enqvist, C. Fox, J. Garces Narro, P.T. Greenlees, K. Helariutta, P.M. Jones, D.T. Joss, R. Julin, S. Juutinen, H. Kankaanpaeae, H. Kettunen, P. Kuusiniemi, M. Leino, M. Muikku, P. Nieminen, P. Rahkila, H.C. Scraggs, S.L. Shepherd, O. Stezowski, J. Uusitalo, P.M. Walker

The isomeric structure of the N=77 isotones   14265Tb and 14467Ho have been studied with the 92Mo(54Fe, xpn) fusion evaporation reaction at the University of Jyvaeskylae. The Jurospehere II germanium array was employed in conjunction with the RITU gas filled recoil separator. The feeding and decay of a 500(20) {n}s isomeric state in 144Ho has been established for the first time together with states built upon the known 15 \mu s isomer in 142Tb. The behavior of these new structures above the isomers suggest that they are low deformation configurations which display signs of triaxiality.

PACS numbers: 21.10.Re, 23.20.--g, 23.20.Lv, 27.60.+j

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