High-spin gamma -ray spectroscopy of <sup>165</sup>W and <sup>166</sup>W
J Simpson; F Hanna; M A Riley; A Alderson; M A Bentley; A M Bruce; D M Cullen; P Fallon; L Walker; J Simpson; SERC Daresbury Lab., Warrington, WA, UK; F Hanna; SERC Daresbury Lab., Warrington, WA, UK; M A Riley; SERC Daresbury Lab., Warrington, WA, UK; A Alderson; SERC Daresbury Lab., Warrington, WA, UK; M A Bentley; SERC Daresbury Lab., Warrington, WA, UK; A M Bruce; SERC Daresbury Lab., Warrington, WA, UK; D M Cullen; SERC Daresbury Lab., Warrington, WA, UK; P Fallon; SERC Daresbury Lab., Warrington, WA, UK; L Walker; SERC Daresbury Lab., Warrington, WA, UK
Журнал:
Journal of Physics G: Nuclear and Particle Physics
Дата:
1992-07-01
Аннотация:
High-spin states of <sup>165</sup>W and <sup>166</sup>W were studied using the <sup>106</sup>Pd(<sup>63</sup>Cu, p3n) and <sup>106</sup>Pd(<sup>63</sup>Cu, p2n) reactions, respectively. Gamma rays in <sup>165</sup>W were identified for the first time using the gamma -ray detector array POLYTESSA and the Daresbury recoil separator. Level schemes for <sup>165</sup>W and <sup>166</sup>W were constructed from the gamma - gamma coincidence data and angular correlation data from the POLYTESSA and TESSA3 arrays. In <sup>166</sup>W the yrast band is established up to 30<sup>+</sup> (32<sup>+</sup>), as well as two side bands up to 22<sup>-</sup> (28<sup>-</sup>) and 23<sup>-</sup> (29<sup>-</sup>). In <sup>165</sup>W the yrast band is established up to 45/2<sup>+</sup> and two side bands up to 55/2<sup>-</sup> (59/2<sup>-</sup>) and 53/2<sup>-</sup>. 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 i<sub>13/2</sub> neutron alignment in the N=91 and 92 isotones are discussed.
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