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Author Randrup, J. ♦ Tsang, C. F. ♦ Möller, P. ♦ Larsson, S. E.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher Elsevier
Language English
Subject Keyword NUCLEAR PHYSICS AND RADIATION PHYSICS ♦ AMERICIUM ISOTOPES- SPONTANEOUS FISSION ♦ BERKELIUM ISOTOPES- SPONTANEOUS FISSION ♦ CALIFORNIUM ISOTOPES- SPONTANEOUS FISSION ♦ CURIUM ISOTOPES- SPONTANEOUS FISSION ♦ EINSTEINIUM ISOTOPES- SPONTANEOUS FISSION ♦ ELEMENT 104- SPONTANEOUS FISSION ♦ ELEMENT 105- SPONTANEOUS FISSION ♦ ELEMENT 106- SPONTANEOUS FISSION ♦ FERMIUM ISOTOPES- SPONTANEOUS FISSION ♦ LAWRENCIUM ISOTOPES- SPONTANEOUS FISSION ♦ MENDELEVIUM ISOTOPES- SPONTANEOUS FISSION ♦ NOBELIUM ISOTOPES- SPONTANEOUS FISSION ♦ PLUTONIUM ISOTOPES- SPONTANEOUS FISSION ♦ URANIUM ISOTOPES- SPONTANEOUS FISSION ♦ ASYMMETRY ♦ GROUND STATES ♦ HALF- LIFE ♦ ISOMERIC NUCLEI ♦ LIQUID DROP MOD
Abstract Ground-state and isomeric fission half-lives are studied for nuclei with Z between 92 and 106. Realistic fission-barrier potentials are established on the basis of a modified liquid-drop model and the modified-oscillator single- particle model, including the effects of reflection asymmetry and axial asymmetry. These barriers, in combination with available experimental half lives, are used to determine a smooth fission inertial-mass function with only one adjustable parameter. This semi-empirical inertia reproduces the normal fission half-lives in this region to within a factor of 25 on the average. Calculations suggest that the longest-lived doubly even isotope of the element 106 occurs for N = 152 with a half-life of around 100 mu sec. Furthermore, the hindrance associated with fission of odd-A nuclei is studied for a few selected cases. A particularly large hindrance factor is obtained for N = 157 for Pm, No and Z = 104 and attributed to the STA 615 9/2<sup>+</sup> neutron orbital. The abrupt drop in half- lives from <sup>256</sup>Fm to <sup>258</sup>Fm is also discussed and interpreted as the decline of the second-barrier peak below the ground-state level.
ISSN 03759474
Educational Use Research
Learning Resource Type Article
Publisher Date 1973-12-01
Journal Nuclear Physics. A
Volume Number 217
Issue Number 2
Organization Univ. of California, Berkeley


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