Novel decay modes of high-<i>K</i>isomers: Tunneling in a triaxial landscape
B. CrowellA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511P. ChowdhuryA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511S. J. FreemanA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511C. J. ListerA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511M. P. CarpenterA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511R.G. HenryA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511R. V. F. JanssensA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511T. L. KhooA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511T. LauritsenA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511Liang YuA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511F. SoramelA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511I. G. BeardenA. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06511
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The nucleus $^{176}\mathrm{W}$ has been studied using the reaction $^{150}\mathrm{Nd}$${(}^{30}$Si,4n), with prompt and delayed \ensuremath{\gamma}-\ensuremath{\gamma} coincidence techniques. A K=14 isomer (${\mathit{t}}_{1/2}$\ensuremath{\approxeq}70 ns) is found to exhibit a unique decay pattern, primarily decaying to K=0 states, in contrast to all previously studied high-K isomers. Calculations have been perfomed of both Coriolis mixing and tunneling through a potential barrier in the triaxial degree of freedom to understand these unusual decays. While Coriolis mixing models do not reproduce the variations in the decay patterns in neighboring nuclei, the tunneling calculations are remarkably successful.
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