Entrance channel effects in the fusion-fission time scales from studies of prescission neutron multiplicities

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.49.932· OSTI ID:5260750

Saxena, A; Chatterjee, A; Choudhury, R K; Kapoor, S S; Nadkarni, D M ^[1]

---

1. Nuclear Physics Division, Bhabha Atomic Research Centre, Bombay 400085 (India)

Prescission neutron multiplicities in fusion-fission reactions of [sup 11]B+[sup 237]Np, [sup 11]B+[sup 232]Th, [sup 12]C+[sup 232]Th, and [sup 16]O+[sup 232]Th, lying on either side of the Businaro-Gallone mass asymmetry ([alpha][sub BG]), have been measured. The present data along with those available in literature for compound systems spanning the fissility range from 0.70 to 0.84 were analyzed in a consistent manner to deduce fusion-fission time scales for all systems. From the systematic behavior of all the data, the three components of total dynamical fusion-fission delay, namely, transient delay, saddle-to-scission delay, and formation delay, have been deduced. It is found that the formation delay depends on the entrance channel mass asymmetry relative to Businaro-Gallone point. The variations of the fusion-fission time scales with fissility, ratio of fission barrier to temperature, and entrance channel mass asymmetry have been studied.

• OSTI ID: 5260750
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 49:2; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663590 -- Nuclear Mass Ranges-- A=220 & Above-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
BARYONS
BORON 11 REACTIONS
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
ELEMENTARY PARTICLES
FERMIONS
FISSION
FISSION BARRIER
FISSION NEUTRONS
HADRONS
HEAVY ION FUSION REACTIONS
HEAVY ION REACTIONS
MULTIPLICITY
NEPTUNIUM 237 TARGET
NEUTRONS
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEONS
POTENTIALS
TARGETS
THORIUM 232 TARGET