6533b837fe1ef96bd12a30ef
RESEARCH PRODUCT
Decay of the 4.2-min152Pm into levels of152Sm
G. WirthGünter HerrmannK. E. SeybK. ChayawattanangkurN. Kaffrellsubject
PhysicsNuclear and High Energy PhysicsScintillationSpectrometerbusiness.industryFissionAnalytical chemistrychemistry.chemical_elementPromethiumSemiconductorchemistryNuclear fusionNeutronAtomic physicsbusinessGround statedescription
After bombardments of enriched152Sm with 14-MeV neutrons, three isomers of125Pm reaction, have been observed with half-lives of 4.2±0.2 min, 7.5±0.2 min and 15.0±1.0 min. Sources of pure 4.2-min152Pm were obtained by separating the promethium from its parent 11-min152Nd produced by thermal-neutron induced fission of235U. The beta and gamma radiations of the 4.2-min152Pm have been investigated using semiconductor and scintillation spectrometers. Most of theγ-ray transitions could be placed in a level scheme for 152Sm. Especially interesting is a level at 1083 keV for which the assignmentI π=0+ is proposed. In a 4πβγ experiment, the ground state feeding of152Sm in theβ −-decay of the 4.2-min152Pm has been measured to be 61% of allβ-ray transitions. AQ β-value of 3.4±0.2 MeV has been obtained.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1975-09-01 | Zeitschrift f�r Physik A Atoms and Nuclei |