Fission decay of N = Z nuclei at high angular momentum: $^{60}$Zn - Nuclear ExperimentReport as inadecuate

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Abstract: Using a unique two-arm detector system for heavy ions the BRS, binaryreaction spectrometer coincident fission events have been measured from thedecay of $^{60}$Zn compound nuclei formed at 88MeV excitation energy in thereactions with $^{36}$Ar beams on a $^{24}$Mg target at $E {lab}^{36}$Ar =195 MeV. The detectors consisted of two large area position sensitive x,y gastelescopes with Bragg-ionization chambers. From the binary coincidences in thetwo detectors inclusive and exclusive cross sections for fission channels withdiffering losses of charge were obtained. Narrow out-of-plane correlationscorresponding to coplanar decay are observed for two fragments emitted inbinary events, and in the data for ternary decay with missing charges from 4 upto 8. After subtraction of broad components these narrow correlations areinterpreted as a ternary fission process at high angular momentum through anelongated shape. The lighter mass in the neck region consists dominantly of twoor three-particles. Differential cross sections for the different mass splitsfor binary and ternary fission are presented. The relative yields of the binaryand ternary events are explained using the statistical model based on theextended Hauser-Feshbach formalism for compound nucleus decay. The ternaryfission process can be described by the decay of hyper-deformed states withangular momentum around 45-52 $hbar$.

Author: W. Von Oertzen Hahn-Meitner-Institut-GmbH, Fachbereich Physik, Free University of Berlin, V. Zherebchevsky Hahn-Meitner-Institut-


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