Theoretical predictions of fission half-lives of elements with Z between 92 and 106

Journal Article · Fri Nov 30 23:00:00 EST 1973 · Nuclear Physics. A

DOI:https://doi.org/10.1016/0375-9474(73)90192-9· OSTI ID:4380765

Randrup, J.; Tsang, C. F.; Möller, P.; Nilsson, S. G.; Larsson, S. E.

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⁺ neutron orbital. The abrupt drop in half- lives from ²⁵⁶Fm to ²⁵⁸Fm is also discussed and interpreted as the decline of the second-barrier peak below the ground-state level.

• Research Organization: Univ. of California, Berkeley
• Sponsoring Organization: USDOE
• NSA Number: NSA-29-011551
• OSTI ID: 4380765
• Journal Information: Nuclear Physics. A, Journal Name: Nuclear Physics. A Journal Issue: 2 Vol. 217; ISSN 0375-9474
• Publisher: Elsevier
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*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
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
GROUND STATES
HALF- LIFE
ISOMERIC NUCLEI
LIQUID DROP MOD