Shape coexistence in <sup>119</sup>I at high spin
E S Paul; J Simpson; H Timmers; I Ali; M A Bentley; A M Bruce; D M Cullen; P Fallon; F Hanna; E S Paul; Oliver Lodge Lab., Liverpool Univ., UK; J Simpson; Oliver Lodge Lab., Liverpool Univ., UK; H Timmers; Oliver Lodge Lab., Liverpool Univ., UK; I Ali; Oliver Lodge Lab., Liverpool Univ., UK; M A Bentley; Oliver Lodge Lab., Liverpool Univ., UK; A M Bruce; Oliver Lodge Lab., Liverpool Univ., UK; D M Cullen; Oliver Lodge Lab., Liverpool Univ., UK; P Fallon; Oliver Lodge Lab., Liverpool Univ., UK; F Hanna; Oliver Lodge Lab., Liverpool Univ., UK
Журнал:
Journal of Physics G: Nuclear and Particle Physics
Дата:
1992-05-01
Аннотация:
Competition between single-particle and collective modes of excitation is observed in <sup>119</sup>I at high spin. Whereas rotational states, associated with a prolate pi h<sub>11/2</sub> orbital, are yrast for spins I<or=39/2, a noncollective oblate state is yrast at I<sup>pi </sup>=43/2<sup>-</sup>. This state is interpreted as the fully-aligned pi (h<sub>11/2</sub> (X) g<sub>7/2</sub><sup>2</sup>)<sub>23/2-</sub> (X) nu (h<sub>11/2</sub><sup>2</sup>)<sub>10+</sub> configuration outside a <sub>50</sub><sup>114</sup>Sn<sub>64</sub> core. Several other noncollective states are observed above this state. At the highest spins, the collective states again become yrast when a pair of h<sub>11/2</sub> neutrons align. The rotational pi h<sub>11/2</sub> (X)( nu h<sub>11/2</sub><sup>2</sup>) structure could be followed up to I<sup>pi </sup>=63/2<sup>-</sup>.
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