Fine structure in proton emission from 141gsHo and 141mHo

Fine structure in proton emission from the 7/2-[523] ground state and from 1/2+[411] isomeric state in the deformed nucleus $^{141}$Ho was discovered at the HRIBF, Oak Ridge. Proton transitions to the 0$^{+}$ ground state and to the 202 keV 2$^{+}$ state in $^{140}$Dy were observed. The branching ratios of I$_{gs}^{2^{+}}$= 0.9(1)\% and I$_{m}^{2^{gs}2^{+}}$=1.7(4)\% were measured by means of fusion-evaporation reactions, Recoil Mass Separator and digital processing of the Double-sided Silicon Strip Detector recoil implantation and decay signals. The structure of the deformed wave functions of the 7/2-[523] and 1/2+[411] states will be discussed. The decay properties of $^{141gs}$Ho can be explained by postulating a small triaxial deformation, while the same model fails to explain observed decay properties of $^{141m}$Ho. The measured isomeric halflife and I$_{m}^{2^{+}}$ value suggest that the contribution of the $\pi$s$_{1/2} \otimes 0^{+}$ component in the 1/2+[411] wave function is reduced to about 3\% only.