The population of deformed bands in ${}^{48}$Cr by emission of ${}^8$Be from the ${}^{32}$S + ${}^{24}$Mg reaction

Abstract

Using particle-$\gamma$ coincidences we have studied the population of final states after the emission of 2 $\alpha$-particles and of ${}^8$Be in nuclei formed in ${}^{32}$S+${}^{24}$Mg reactions at an energy of ${\text{E}}_{\mathrm{L}}{(}^{32}\text{S})=130\mathrm{MeV}$. The data were obtained in a setup consisting of the GASP $\gamma$-ray detection array and the multidetector array ISIS. Particle identification is obtained from the $\Delta$E and E signals of the ISIS silicon detector telescopes, the ${}^8$Be being identified by the instantaneous pile up of the $\Delta$E and E pulses. $\gamma$-ray decays of the ${}^{48}$Cr nucleus are identified with coincidences set on 2 $\alpha$-particles and on ${}^8$Be. Some transitions of the side-band with $K^{\pi }=4^{-}$ show stronger population for ${}^8$Be emission relative to that of 2 $\alpha$-particles (by a factor $1.5-1.8$). This observation is interpreted as due to an enhanced emission of ${}^8$Be into a more deformed nucleus. Calculations based on the extended Hauser-Feshbach compound decay formalism confirm this observation quantitatively.

17 pages, 9 figures accepted for publication in J. Phys. G

References in corpus (7)

• Intrinsic vs. laboratory frame description of the deformed nucleus 48Cr
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• Extended Hauser-Feshbach Method for Statistical Binary-Decay of Light-Mass Systems
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• Highly deformed ${}^{40}$Ca configurations in ${}^{28}$Si + ${}^{12}$C
• Alpha-cluster Condensations in Nuclei and Experimental Approaches for their Studies
• Evidence of large nuclear deformation of ${}^{32}$S${}^{\ast }$ formed in ${}^{20}$Ne + ${}^{12}$C reaction
• Nuclear alpha-clustering, superdeformation, and molecular resonances
• On the role of different Skyrme forces and surface corrections in exotic cluster-decay