Investigation of high-spin states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Fe</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>53</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>
Abstract
The fusion-evaporation reactions $^{28}\mathrm{Si}(^{32}\mathrm{S},1\ensuremath{\alpha}2p1n)^{53}\mathrm{Fe}$ at 125 MeV and $^{24}\mathrm{Mg}(^{32}\mathrm{S},2p1n)^{53}\mathrm{Fe}$ at a 95-MeV beam energy were used to investigate excited states in $^{53}\mathrm{Fe}$. The combination of the Gammasphere Ge detector array and ancillary devices led to the construction of an extensive level scheme comprising some 90 transitions connecting 40 states. The lifetime of the yrast $25/{2}^{\ensuremath{-}}$ state and upper limits for the lifetimes of a number of additional states were determined using the Cologne plunger device coupled to the GASP \ensuremath{\gamma}-ray spectrometer. The experimental results are compared to large-scale shell-model calculations using different sets of two-body matrix elements. In particular, predictions on electromagnetic decay properties such as lifetimes, branching ratios, and mixing ratios are studied in detail.