Energy levels of /sup 250/Cf populated in the. beta. /sup -/ decay of /sup 250/Bk

Journal Article · Mon Jan 01 04:00:00 EST 1979 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.19.188· OSTI ID:6193098

Reich, C W; Helmer, R G; Gehrke, R J

The level scheme of doubly even /sup 250//sub 98/Cf/sub 152/ has been studied from the ..beta../sup -/ decay of /sup 250/Bk. ..gamma..-ray energy and intensity measurements were made using Ge(Li) and Si(Li) detectors. Analysis of ..gamma..-singles and ..gamma..-..gamma.. coincidence data has revealed the existence of approx. 46 ..gamma..-ray transitions. Approximately 40 of these, accounting for > or approx. = 99.97% of the observed ..gamma..-ray intensity, have been incorporated into a level scheme for /sup 250/Cf consisting of 17 excited states with excitation energies up to 1695 keV. The following states, whose I/sup ..pi../ values and energies (in keV) are well known from other experiments, are observed: the 0/sup +/(0), 2/sup +/(42.73), and 4/sup +/(141.89) members of the ground-state band; the 2/sup -/(871.56), 3/sup -/(905.85), and 4/sup -/(952.0) members of the K/sup ..pi../ = 2/sup -/ octupole band; and the 2/sup +/(1031.85) and 3/sup +/(1071.38) members of the ..gamma..-vibrational band. In addition, evidence is presented which permits the following I, K/sup ..pi../ assignments to be made with reasonable confidence (the corresponding level energies: in keV: are given in parentheses): 1,1/sup -/(1175.5); 2.2/sup +/(1244.50); 2,0/sup +/(1296.64); 2,2/sup +/(1657.99); and 3,2/sup +/(1695.2). The half-life of /sup 250/Bk has been remeasured and a value of 192.7 +- 0.3 m obtained. The absolute intensities (in photons/100 /sup 250/Bk ..beta../sup -/ decays) of the prominent 989- and (1028 +- 1031) -keV ..gamma.. rays have been measured using a 4..pi.. ..beta..-..gamma.. coincidence system and values of 45.0 +- 0.8 and 40.6 +- 0.7, respectively, have been obtained.

• Research Organization: Idaho National Engineering Laboratory, EGG Idaho, Inc., Idaho Falls, Idaho 83401
• OSTI ID: 6193098
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 19:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

652022* -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Radioactive Decay-- (-1987)
652023 -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
ALPHA SPECTRA
ANGULAR MOMENTUM
BERKELIUM 250
BERKELIUM ISOTOPES
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY
BETA-MINUS DECAY RADIOISOTOPES
CALIFORNIUM 250
CALIFORNIUM ISOTOPES
COINCIDENCE SPECTROMETRY
DAYS LIVING RADIOISOTOPES
DECAY
EINSTEINIUM 254
EINSTEINIUM ISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
EVEN-EVEN NUCLEI
FT VALUE
GAMMA SPECTRA
HALF-LIFE
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
ISOTOPES
NUCLEI
ODD-ODD NUCLEI
PARITY
PARTICLE PROPERTIES
RADIOISOTOPES
SPECTRA
SPIN
YEARS LIVING RADIOISOTOPES