Transition Probabilities of Excited Nuclear States in¹³³Cs

Abstract

The lifetimes of the excited states in 133Cs have been measured by the delayed coincidence technique. The results are:The 81.0 keV level: T½ = 6.27 ± 0.04 nsThe 160.5 keV level: T½ = 190 ± 15 psThe 384 keV level: T½ = 40 ± 20 psThe 437 keV level: T½ ⩽ 150 psA comparison is made between experimental and theoretical transition probabilities. The 160 keV state is interpreted as a three quasi particle state.

Measurements of subnanosecond nuclear lifetimes

“…1). The half-life is found to be 180+10 psec which agrees with the value measured by Valivaara et al [5]. agnetic moment of «d [10,11] has been reca- [13], the 830 -184 keV cascade passes through the 264 keV level of T, && =114 psec [13],and the 198 -816 keV cascade passes through the 896 keV level.…”

“…(i) The half-life of the 161 keV level has been measured earlier and values from 85 to 249 psec have been reported (Table I). The accepted one is T,&2=190+15 psec [3,4], measured by Valivaara et al [5] Holmberg et al. [8] using a y-y coincidence setup with two plastic scintillators at a time resolution (1.1 nsec) much greater than the half-life measured (490+15 psec).…”

Timing characteristics of the R13089-100 photomultiplier tube coupled with 1.5" × 1.5" CeBr3 scintillators and its application in lifetime measurements

“…The corresponding literature values of the lifetimes are also mentioned in table 1. The adopted lifetime of 383 keV level of 133 Cs is 63( 16) ps [28], which is the weighted average of two fast timing measurements with conversion electrons [29]. Another lifetime value of this state of 36 (6) ps has also been reported, obtained from the measurements of Coulomb excitation [28].…”