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Lifetimes in Neutron-Rich Nd Isotopes Measured by a Doppler Profile Method

A. G. SmithDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomW. R. PhillipsDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomJ. L. DurellDepartment 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 KingdomC. J. PearsonDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomJ. A. ShannonDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomI. AhmadDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomC. J. ListerDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomLester R. MorssDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomK.L. NashDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomC. W. WilliamsDepartment of Physics and Astronomy, University of Manchester, M13 9PL, United KingdomM. BentalebDepartment 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 Kingdom

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Annotatsiya

The Eurogam-1 array has been used to study $\ensuremath{\gamma}$ rays emitted following the spontaneous fission of a $^{248}\mathrm{Cm}$ source. Yrast level schemes for the neutron-rich nuclei $^{152,154,156}\mathrm{Nd}$ have been constructed. The stopping of the Nd fragments in the source material leads to Doppler-broadened line shapes for those states that have lifetimes comparable to the stopping time. This paper describes the first measurements of lifetimes of medium-spin states in very neutron-rich nuclei obtained from the analysis of these line shapes. The transition quadrupole moments for the yrast states in the spin range $(10\ensuremath{-}16)\ensuremath{\hbar}$ have been deduced to be 5.88 \ifmmode\pm\else\textpm\fi{} 0.08 e b ($^{152}\mathrm{Nd}$), 5.75 \ifmmode\pm\else\textpm\fi{} 0.10 e b ($^{154}\mathrm{Nd}$), and 5.33 \ifmmode\pm\else\textpm\fi{} 0.16 e b ($^{156}\mathrm{Nd}$).

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DOI: 10.1103/physrevlett.73.2540

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