Spin-Dependent Triaxial Deformation in Neutron-Rich Mo Isotopes
A. G. SmithDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomJohn DurellDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomW. R. PhillipsDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomM.A. JonesDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomM. J. LeddyDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomW. UrbanDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomB. J. VarleyDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomI. AhmadDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomLester R. MorssDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomM. BentalebDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomA. GuessousDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomE. LubkiewiczDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomN. SchulzDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomR. WyssDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United Kingdom
ABI
Аннотация
The Eurogam-2 array has been used to study $\ensuremath{\gamma}$ rays emitted following the spontaneous fission of a $^{248}\mathrm{Cm}$ source. Analysis of Doppler-broadened line shapes corresponding to decays from excited rotational states in neutron-rich Sr, Zr, and Mo fission fragments has enabled the first measurements of state lifetimes in these nuclei at around $I=10$. The results are consistent with a predicted rotation-induced change in the triaxiality of the yrast states of the Mo isotopes that contrasts with the more stable behavior observed in the Zr and Sr nuclei.
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