Systematic study of near-yrast band structures in odd-mass <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Pr</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>125</mml:mn><mml:mo>−</mml:mo><mml:mn>137</mml:mn></mml:mrow></mml:mmultiscripts></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Pm</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>127</mml:mn><mml:mo>−</mml:mo><mml:mn>139</mml:mn></mml:mrow></mml:mmultiscripts></mml:math> isotopes
S. Jehangir, G. H. Bhat, N. Rather, J. A. Sheikh, R. Palit
Abstract
In the present work, the basis space in the triaxial projected shell-model approach is expanded to include three and five quasiparticle configurations for odd-proton systems. This extension allows us to investigate the high-spin band structures observed in odd-proton systems up to and including the second band-crossing region and, as a first major application of this development, the high-spin properties are investigated for odd-mass $^{125\ensuremath{-}137}\mathrm{Pr}$ and $^{127\ensuremath{-}139}\mathrm{Pm}$ isotopes. It is shown that band crossings in the studied isotopes have mixed structures with the first crossing dominated by one-proton coupled to two-neutron configuration for the lighter isotopes which then changes to three-proton configuration with increasing neutron number. Furthermore, $\ensuremath{\gamma}$ bands based on quasiparticle states are also delineated in the present work, and it is predicted that these band structures built on three-quasiparticle configurations become favored in energy for heavier systems in the high-spin region.