Structure of N=81 nuclei: Levels of $sup 141$Nd and $sup 139$Ce populated in beta decay
The nuclear level structure of $sup 141$Nd and $sup 139$Ce has been investigated by studying the decay of 20.9-min $sup 141$Pm produced via the $sup 141$Pr($sup 3$He, 3n) reaction and the decay of 4.5-h $sup 139$Pr produced by the $sup 140$Pr($gamma$, n)$sup 139$Pr reaction. For the $sup 141$Pm decay, singles and anti-Compton $gamma$-ray spectra and $gamma$$-$$gamma$ coincidence measurements were used to deduce a decay scheme that includes nine previously unreported levels in $sup 141$Nd and incorporates 67 of the 70 $gamma$ rays attributed to the decay of $sup 141$Pm. Singles and anti-Compton spectra were taken as a function of time in order to confirm assignment of the $sup 139$Pr $gamma$ rays. The level structures of $sup 141$Nd and $sup 139$Ce are compared to recent measurements in other N=81 isotones. The results of this work are in good agreement with theoretical predictions based on the hole-vibrational coupling model for levels below 1.3 MeV. There exists more levels between 1.3 and 2.0 MeV than are predicted by this model, but these excess levels can be explained qualitatively within a weak coupling framework. (AIP)
- Research Organization:
- Department of Chemistry, Washington University, St. Louis, Missouri 63130
- NSA Number:
- NSA-33-031820
- OSTI ID:
- 4011963
- Journal Information:
- Phys. Rev., C, v. 13, no. 4, pp. 1590-1600, Journal Name: Phys. Rev., C, v. 13, no. 4, pp. 1590-1600; ISSN PRVCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
*NEODYMIUM 141-- ENERGY LEVELS
*PRASEODYMIUM 139-- BETA-PLUS DECAY
*PRASEODYMIUM 140 TARGET-- PHOTONUCLEAR REACTIONS
*PRASEODYMIUM 140-- PHOTONUCLEAR REACTIONS
*PRASEODYMIUM 141 TARGET-- HELIUM 3 REACTIONS
*PRASEODYMIUM 141-- HELIUM 3 REACTIONS
*PROMETHIUM 141-- BETA-PLUS DECAY
642803*
GAMMA RADIATION
N68721* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
90 <= A <= 149--Radioactive Decay
WEAK-COUPLING MODEL