Viscosity of saddle-to-scission motion in hot [sup 240]Cf from giant dipole resonance [gamma] yield

Journal Article · Mon Jan 24 04:00:00 UTC 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.470· OSTI ID:5261688

Hofman, D J; Back, B B; Dioszegi, I; Montoya, C P; Schadmand, S; Varma, R; Paul, P ^[1]

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1. Department of Physics, State University of New York at Stony Brook, Stony Brook, New York 11794 (United States)

The giant dipole resonance [gamma] decay of [sup 240]Cf excited to 67 and 93 MeV was measured from the fusion of [sup 32]S+[sup 208]Pb. The [gamma] spectrum and [gamma]-fission angular correlation are analyzed in terms of prefission and postfission [gamma]-ray yields using a stattistical model with nuclear viscosity in the fission process. The results show a strong increase in the prescission [gamma] yield from 67 to 93 MeV. A saddle to scission time [tau][sub ssc=]30[times]10[sup [minus]21] s is extracted from this [gamma] yield, equivalent to a normalized viscosity [gamma][approx]5 and full one-body dissipation.

• DOE Contract Number: FG02-93ER40780
• OSTI ID: 5261688
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:4; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

663300 -- Nuclear Reactions & Scattering
General-- (1992-)
663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663590 -- Nuclear Mass Ranges-- A=220 & Above-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
ANGULAR CORRELATION
CALIFORNIUM 240
CALIFORNIUM ISOTOPES
CHARGED-PARTICLE REACTIONS
CORRELATIONS
DECAY
EVEN-EVEN NUCLEI
FISSION YIELD
GAMMA DECAY
GIANT RESONANCE
HEAVY ION REACTIONS
HEAVY NUCLEI
ISOTOPES
LEAD 208 TARGET
MINUTES LIVING RADIOISOTOPES
NUCLEAR DECAY
NUCLEAR REACTION YIELD
NUCLEAR REACTIONS
NUCLEI
RADIOISOTOPES
RESONANCE
SULFUR 32 REACTIONS
TARGETS
VISCOSITY
YIELDS