High-spin states in the continuum. I. $sup 20$Ne
Journal Article
·
· Phys. Rev., C, v. 8, no. 6, pp. 2203-2216
OSTI ID:4343545
We describe a new angular-correlation method for assigning spins to states that are selectively populated in reactions of the type /sup 12/C(/sup 12 / C alpha )/sup 20/Ne and which decay by the emission of an alpha particle to a state of nonzero spin, which decays in turn to a spin-zero state by the emission of a gamma ray. Such states are not accessible to conventional particle- particle angular-correlation techniques. The new method consists of measuring the triple-angular correlation of the two alpha particles and the gamma ray from the reaction /sup 12/C(/sup12/C, alpha /sub 1/ alpha /sub 2/ gamma )/sup 1 6/O with the first emitted alpha particle observed at zero degrees, the gamma ray observed at a fixed angle, and the second emitted alpha particle observed over a range of angles. Applications of this method to the determination of the spins of two states in /sup 20/Ne, at 15.18 plus or minus 0.02 MeV (6/sup +/) and 17.40 plus or minus 0.02 MeV (9/sup -/), are discussed. The 17.40-MeV state has been identified as the 9/sup member of the lowest negative-parity band in /sup 20/Ne; the 6/sup +/ assignment to the level at 15.18 MeV is in disagreement with an earlier assignment of spin and parity 9/sup -/ to this level. (auth)
- Research Organization:
- Physics Department, University of Pennsylvania, Philadelphia, Pennsylvania 19174
- NSA Number:
- NSA-29-022896
- OSTI ID:
- 4343545
- Journal Information:
- Phys. Rev., C, v. 8, no. 6, pp. 2203-2216, Journal Name: Phys. Rev., C, v. 8, no. 6, pp. 2203-2216; ISSN PRVCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALPHA DECAY-- BRANCHING RATIO-- EXCITED STATES-- LEVEL WIDTHS-- MEASURING METHODS-- MOMENT OF INERTIA-- NEON 20-- PARITY-- ROTATIONAL STATES-- SPIN
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N68351 --Physics (Nuclear
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6 <= A <= 19--Nuclear Reactions & Scattering
N68431* --Physics (Nuclear
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20 <= A <= 38--Energy Levels & Transitions
ALPHA PARTICLES-- ANGULAR CORRELATION-- CARBON 12-- CARBON 12 REACTIONS-- GAMMA RADIATION-- MEV RANGE 10-100-- NEON 20-- OXYGEN 16-- TRANSFER REACTIONS
N68351 --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
6 <= A <= 19--Nuclear Reactions & Scattering
N68431* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
20 <= A <= 38--Energy Levels & Transitions