Mean lifetimes of levels inCu59

Abstract

The mean lifetimes of levels in $^{59}\mathrm{Cu}$ below 3.6 MeV have been investigated with the Doppler-shift attenuation method and the $^{58}\mathrm{Ni}(^{3}\mathrm{He},d)^{59}\mathrm{Cu}$ reaction at 11.6 MeV. Scattered particles were detected in two $E\ensuremath{-}\ensuremath{\Delta}E$ telescopes at \ifmmode\pm\else\textpm\fi{} 55\ifmmode^\circ\else\textdegree\fi{} with respect to the beam axis, in coincidence with $\ensuremath{\gamma}$ rays observed at 90\ifmmode^\circ\else\textdegree\fi{} in a 50-${\mathrm{cm}}^{3}$ Ge(Li) detector. New levels were observed at 3114 and 3615 keV. Mean lifetimes are reported for the following levels (energy in keV, lifetime in fs): 491 (830 \ifmmode\pm\else\textpm\fi{} 300), 914 (g 1600), 1399 (570 \ifmmode\pm\else\textpm\fi{}240), 2266 (310 \ifmmode\pm\else\textpm\fi{} 140), 2324 (36 \ifmmode\pm\else\textpm\fi{}5), 3043 (1150 \ifmmode\pm\else\textpm\fi{} 500), 3114 (20 \ifmmode\pm\else\textpm\fi{} 11), 3130 (10 \ifmmode\pm\else\textpm\fi{} 4), 3551 ( 15), 3580 (2400 \ifmmode\pm\else\textpm\fi{} 1400), and 3615 ( 35). The experimental results are compared with the predictions of a core-particle coupling calculation.