Collective excitations in $sup 246$Cm and the decay of $sup 246$Am/subm/

Journal Article · Sun Feb 01 00:00:00 EST 1976 · Phys. Rev., C, v. 13, no. 2, pp. 771-789

OSTI ID:4030258

Multhauf, L G; Tirsell, K G; Meyer, R A

Intense sources of $sup 246$Pu have been produced (through double neutron capture by $sup 244$Pu) for making detailed electromagnetic and conversion-electron measurements of the decay of $sup 246$Am/subm/ to levels of $sup 246$Cm. $gamma$ rays from $sup 246$Pu decaying to $sup 246$Am levels were identified in a chemical milking experiment. Of the 260 $sup 246$Cm $gamma$ rays observed, 97 are new and 64 have been assigned multipolarities from Si (Li) conversion-electron measurements. Some transitions were found to have strong E0 components, and two pure E0 transitions were observed. High-resolution $gamma$- $gamma$--time coincidence measurements were used to establish 54 levels, from which the low-energy band structure of $sup 246$Cm was determined. The investigation confirmed previous assignments of K/sup pi/=0$sup -$, 1$sup -$, and 2$sup -$ octupole bands, and a K/sup pi/=0$sup +$ band at 1175 keV. We have also identified the probable K/sup pi/=3$sup -$ octupole band, and a second K/sup pi/ =0$sup +$ band at 1289 keV. The two K/sup pi/=0$sup +$ bands are discussed in terms of possible collective excitations. Other identified bands are discussed in terms of two-quasiparticle and multipole-phonon excitations. (AIP)

• Research Organization: Lawrence Livermore Laboratory, University of California, Livermore, California 94550
• NSA Number: NSA-33-024885
• OSTI ID: 4030258
• Journal Information: Phys. Rev., C, v. 13, no. 2, pp. 771-789, Other Information: Orig. Receipt Date: 30-JUN-76
• Country of Publication: United States
• Language: English

Related Subjects

N69131* -Physics (Nuclear
Experimental)-Nuclear Properties & Reactions
A >= 220-Energy Levels & Transitions
N68521 -Physics (Nuclear
Experimental)-Nuclear Properties & Reactions
39 <= A <= 58-Radioactive Decay
643403*
*AMERICIUM 246- COLLECTIVE EXCITATIONS
*PLUTONIUM 244 TARGET- NEUTRON REACTIONS
*PLUTONIUM 244- NEUTRON REACTIONS
*PLUTONIUM 246- BETA- MINUS DECAY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
GAMMA RADIATION