Helium-ion-induced fission excitation functions of terbium and ytterbium
Journal Article
·
· Physical Review, C (Nuclear Physics); (United States)
- Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Bombay en400 085 (India)
[sup 4]He-ion-induced fission excitation functions of terbium ([ital Z]=65) and ytterbium ([ital Z]=70) were obtained by measuring fission cross sections in the energy range of 40--65 MeV using lexan polycarbonate plastic as the fission fragment track detector. The present measurements extend the range of low-[ital Z] elements in the deformed region for which [sup 4]He-ion-induced fission excitation functions were obtained at moderate energies. The analysis of the ratio of [Gamma][sub [ital f]]/[Gamma][sub [ital n]][approx][sigma][sub [ital f]]/[sigma][sub [ital R]], which is a measure of the competition between fission and neutron emission widths, in terms of the statistical model expression, indicates the fission thresholds for [sup 163]Ho and [sup 177.1]Hf to be 31.5[plus minus]3.5 and 26.7[plus minus]3.0 MeV, respectively. The corresponding value for the fission level density parameter [ital a][sub [ital f]] was found to be [ital A]/12 MeV[sup [minus]1] for both the compound nuclei. [sub 67][sup 163]Ho represents the lightest compound nucleus for which fission barrier has been determined experimentally. The measured fission barriers compare very well with the theoretical fission barriers obtained by liquid-drop-based models. The present data have been used along with similar data available in the literature to bring out some systematics in the fission properties of low-[ital Z] elements.
- OSTI ID:
- 6326138
- Journal Information:
- Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 48:1; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
663440* -- D-
T-
& He-induced Reactions & Scattering-- (1992-)
663470 -- Fission-- (1992-)
663570 -- Nuclear Mass Ranges-- A=150-189-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
EMISSION
ENERGY RANGE
FISSION
FISSION FRAGMENTS
FISSION TRACKS
INTEGRAL CROSS SECTIONS
LINE WIDTHS
MEV RANGE
MEV RANGE 10-100
NEUTRON EMISSION
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
PARTICLE TRACKS
TARGETS
TERBIUM 159 TARGET
YTTERBIUM 174 TARGET
T-
& He-induced Reactions & Scattering-- (1992-)
663470 -- Fission-- (1992-)
663570 -- Nuclear Mass Ranges-- A=150-189-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
EMISSION
ENERGY RANGE
FISSION
FISSION FRAGMENTS
FISSION TRACKS
INTEGRAL CROSS SECTIONS
LINE WIDTHS
MEV RANGE
MEV RANGE 10-100
NEUTRON EMISSION
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
PARTICLE TRACKS
TARGETS
TERBIUM 159 TARGET
YTTERBIUM 174 TARGET