Lifetimes of rotational states in $sup 232$Th

Journal Article · Mon Dec 01 04:00:00 EST 1975 · Phys. Rev., C, v. 12, no. 6, pp. 1927-1936

OSTI ID:4091483

Johnson, N R; Sturm, R J; Eichler, E; Guidry, M W; O'Kelley, G D; Sayer, R O; Hensley, D C; Singhal, N C; Hamilton, J H

Lifetimes of the 4$sup +$ through 10$sup +$ member of the ground-state rotational band in $sup 232$Th have been measured by the Doppler-shift recoil- distance technique. These states were Coulomb excited by 152-MeV $sup 40$Ar ions, and measurements were carried out in coincidence with the backscattered projectiles. The half-lives for the 4$sup +$ through 10$sup +$ states are 164 plus-or-minus 9, 66.2 plus-or-minus 3.6, 25.1 plus-or-minus 1.0, and 11.2 plus-or- minus 1.7 ps, respectively. The B (E2) values deduced for these states are systematically about 10% smaller than rigid-rotor values; however, the constancy of the transition quadrupole moments is interpreted as an indication of rotational behavior. (AIP)

• Research Organization: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• NSA Number: NSA-33-019126
• OSTI ID: 4091483
• Journal Information: Phys. Rev., C, v. 12, no. 6, pp. 1927-1936, Journal Name: Phys. Rev., C, v. 12, no. 6, pp. 1927-1936; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

*THORIUM 232 TARGET-- ARGON 40 REACTIONS
*THORIUM 232-- ROTATIONAL STATES
643403*
ENERGY-LEVEL TRANSITIONS
INELASTIC SCATTERING
LIFETIME
MATRIX ELEMENTS
MEV RANGE 100-1000
N69131* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
A >= 220--Energy Levels & Transitions
N69151 --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
A >= 220--Nuclear Reactions & Scattering
NUCLEAR RADII