High-spin gamma -ray spectroscopy of¹⁶⁵W and¹⁶⁶W

High-spin states of 165W and 166W were studied using the 106Pd(63Cu, p3n) and 106Pd(63Cu, p2n) reactions, respectively. Gamma rays in 165W were identified for the first time using the gamma -ray detector array POLYTESSA and the Daresbury recoil separator. Level schemes for 165W and 166W were constructed from the gamma - gamma coincidence data and angular correlation data from the POLYTESSA and TESSA3 arrays. In 166W the yrast band is established up to 30+ (32+), as well as two side bands up to 22- (28-) and 23- (29-). In 165W the yrast band is established up to 45/2+ and two side bands up to 55/2- (59/2-) and 53/2-. The rotational structures and band crossings observed are interpreted within the framework of the cranked shell model in terms of quasiparticle excitations. The systematics of the second i13/2 neutron alignment in the N=91 and 92 isotones are discussed.

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