Fission decay of N=Z nuclei at high angular momentum: {sup 60}Zn

Journal Article · Wed Oct 15 00:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.78.044615· OSTI ID:21192326

Oertzen, W von ^[1]; Zherebchevsky, V ^[1]; Gebauer, B; Schulz, Ch; Thummerer, S; Wilpert, Th ^[1]; Kamanin, D ^[2]; Royer, G ^[3]

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1. Hahn Meitner Institut GmbH, Glienicker Strasse 100, D-14109 Berlin (Germany)
2. FLNR, JINR, Dubna (Russian Federation)
3. Laboratoire Subatech, Universite-IN2P3/CNRS-Ecole des Mines, F-44307 Nantes (France)

Using a unique two-arm detector system for heavy ions (the BRS, binary reaction spectrometer), coincident fission events have been measured from the decay of {sup 60}Zn compound nuclei formed at 88 MeV excitation energy in the reactions with {sup 36}Ar beams on a {sup 24}Mg target at E{sub lab}({sup 36}Ar)=195 MeV. The detectors consisted of two large-area position-sensitive (x,y) gas telescopes with Bragg-ionization chambers. From the binary coincidences in the two detectors, inclusive and exclusive cross sections for fission channels with differing losses of charge were obtained. Narrow out-of-plane correlations corresponding to coplanar decay are observed for two fragments emitted in binary events, and in the data for ternary decay with missing charges from 4 up to 8. After subtraction of broad components, these narrow correlations are interpreted as a ternary fission process at high angular momentum through an elongated shape. The lighter mass in the neck region consists dominantly of two or three {alpha} particles. Differential cross sections for the different mass splits for binary and ternary fission are presented. The relative yields of the binary and ternary events are explained using the statistical model based on the extended Hauser-Feshbach formalism for compound nucleus decay. The ternary fission process can be described by the decay of hyper-deformed states with angular momenta around 4552({Dirac_h}/2{pi})

• OSTI ID: 21192326
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 78, Issue 4; Other Information: DOI: 10.1103/PhysRevC.78.044615; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ANGULAR MOMENTUM
ARGON 36
BEAMS
COMPOUND NUCLEI
CORRELATIONS
DECAY
DIFFERENTIAL CROSS SECTIONS
EXCITATION
HAUSER-FESHBACH THEORY
HEAVY IONS
IONIZATION CHAMBERS
MAGNESIUM 24 TARGET
MASS
MEV RANGE
SPECTROMETERS
STATISTICAL MODELS
TELESCOPES
TERNARY FISSION
ZINC 60