Isotope and element distributions of the evaporation residues from fusion of 160 MeV /sup 32/S with /sup 24/ /sup 25/ /sup 26/Mg and /sup 27/Al

Journal Article · Thu Sep 01 00:00:00 EDT 1977 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.16.1010· OSTI ID:7209699

Puehlhofer, F; Schneider, W F.W.; Busch, F; Barrette, J; Braun-Munzinger, P; Gelbke, C K; Wegner, H E

Evaporation residues from fusion reactions induced by 160 MeV /sup 32/S on targets of /sup 24/ /sup 25/ /sup 26/Mg and /sup 27/Al were identified by means of a time-of-flight ..delta..E-E detector telescope. Angular distributions were measured in the range from 3/sup 0/ to 16/sup 0/ and total yields were determined as a function of A and Z of the products. The mass distributions of the evaporation residues (summed over Z) show the typical structure arising from the competition between nucleon and ..cap alpha.. evaporation in the decay of the highly excited (83 to 90 MeV) compound nuclei, with only little variation between the four systems. It is concluded that the deexcitation mechanism is to a large extent independent of the individual structure of the nuclei in the decay chains. This is also demonstrated by the yield distributions for the individual nuclides, in particular by the similarity of the yield patterns obtained in the N-Z plane for the compound nuclei /sup 59/Cu and /sup 57/Ni. The data are reproduced very well by evaporation calculations based on the statistical theory. Effects of nuclear deformations due to the high angular momentum on the shape of the yrast line and on the transmission coefficients for the emitted light particles were included. The influence of shell effects in the level densities at high excitation was studied and found to be negligible above 15 MeV excitation.

• Research Organization: Gesellschaft fuer Schwerionenforschung GSI, Darmstadt, Germany
• OSTI ID: 7209699
• Journal Information: Phys. Rev., C; (United States), Vol. 16:3
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 TARGET
SULFUR 32 REACTIONS
MAGNESIUM 24 TARGET
MAGNESIUM 25 TARGET
MAGNESIUM 26 TARGET
FUSION REACTIONS
ALPHA PARTICLES
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
COMPOUND-NUCLEUS REACTIONS
DECAY
DIFFERENTIAL CROSS SECTIONS
ENERGY LEVELS
EVAPORATION MODEL
MEV RANGE 100-1000
SHELL MODELS
TIME-OF-FLIGHT METHOD
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DISTRIBUTION
ENERGY RANGE
HEAVY ION REACTIONS
MATHEMATICAL MODELS
MEV RANGE
NUCLEAR MODELS
NUCLEAR REACTIONS
TARGETS
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