New high spin states and band termination in {sup 83}Y and {sup 84}Zr

摘要: The gamma decay of high spin yrast states in {sup 83}Y up to I{sup {pi}}=59/2{sup +} and 53/2{sup {minus}} have been observed using the reaction 58}Ni({sup 29}Si,3p) at 110 MeV Gammasphere Early Implementation Array. level scheme has substantially extended due observations several new transitions all bands. A sequence feeding into positive parity band above {pi}}=47/2{sup seems be consistent with a noncollective oblate structure expected these spins. similar cascade is found data for 84}Zr. forking favored negative which may neutron alignment polarizing core different shape. This suggests that {open_quotes}isomeric{close_quote}{close_quote} 83}Y, one more connecting transition was found, nature other high-K bands this region. Lifetime measurements unfavored are cranking calculations predict nearly shape deformation parameter {beta}{sub 2}{approx}0.2. qualitative analysis line shapes very spins persistence collectivity highest excitationsmore » seen. {copyright} {ital 1997} American Physical Society}« less