Статья

Triaxiality and the aligned<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>h</mml:mi><mml:mrow><mml:mn>11</mml:mn><mml:mo>∕</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>neutron orbitals in neutron-rich Zr and Mo isotopes

H. HuaNuclear Structure Research Laboratory, Department of Physics, University of Rochester, Rochester, New York 14627, USAC. Y. WuNuclear Structure Research Laboratory, Department of Physics, University of Rochester, Rochester, New York 14627, USAD. ClineNuclear Structure Research Laboratory, Department of Physics, University of Rochester, Rochester, New York 14627, USAA. B. HayesNuclear Structure Research Laboratory, Department of Physics, University of Rochester, Rochester, New York 14627, USAR. TengNuclear Structure Research Laboratory, Department of Physics, University of Rochester, Rochester, New York 14627, USAR. M. ClarkNuclear Structure Research Laboratory, Department of Physics, University of Rochester, Rochester, New York 14627, USAP. FallonNuclear Structure Research Laboratory, Department of Physics, University of Rochester, Rochester, New York 14627, USAA. GoergenNuclear Structure Research Laboratory, Department of Physics, University of Rochester, Rochester, New York 14627, USAA. O. MacchiavelliNuclear Structure Research Laboratory, Department of Physics, University of Rochester, Rochester, New York 14627, USAK. VetterNuclear Structure Research Laboratory, Department of Physics, University of Rochester, Rochester, New York 14627, USA

2004lv

ABI

Аннотация

Neutron-rich Zr and Mo isotopes were populated as fission fragments produced by the $^{238}\mathrm{U}(\ensuremath{\alpha},\mathit{f})$ fusion-fission reaction. The level schemes of these nuclei have been extended beyond the first band crossing region, which can be ascribed to the ${h}_{11∕2}$ neutron pair alignment. The spin alignment and signature splitting for the $\ensuremath{\nu}{h}_{11∕2}$ orbitals in term of triaxiality is addressed. The crossing frequency of the aligned bands in even Zr and Mo isotopes can be reproduced well by calculations using the cranked shell model. Compared to the Zr isotopes, band crossings in Mo isotopes shift to a lower rotational frequency due to the emerging importance of the $\ensuremath{\gamma}$ degree of freedom. Within the framework of particle-rotor model, the difference in the signature splitting observed for the $\ensuremath{\nu}{h}_{11∕2}$ bands between the odd Zr and Mo isotopes can be attributed to the triaxial degree of freedom in the Mo isotopes. The surprising shift of the band crossing to a higher rotational frequency in $^{106}\mathrm{Mo}$ is interpreted as a manifestation of the deformed subshell closure at $N=64$.

Перевод пока недоступен

Идентификаторы

DOI: 10.1103/physrevc.69.014317

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar