Heavy-ion fusion-evaporation reactions: high spin states in $sup 43$Ca and $sup 43$Sc
Journal Article
·
· Phys. Rev., C, v. 13, no. 3, pp. 1180-1193
OSTI ID:4013672
Fusion-evaporation reactions, primarily $sup 27$Al($sup 19$F, n2p)$sup 43$Ca and $sup 27$Al($sup 19$F, 2np)$sup 43$Sc, have been used to investigate the structure and formation of the residual nuclei. Decay schemes of the yrast levels which are populated are presented together with suggested spin assignments for some of the higher levels: Incidental results obtained for the nuclei $sup 44$Ca, $sup 44$Sc, and $sup 40$Ca are also discussed. Mean lifetimes measured by the recoil distance method are as follows: ($sup 43$Ca): 2754-keV level, tau = 34.1 +- 1.5 psec; 990-keV level, tau = 73 +- 11 psec; ($sup 43$Sc): 880-keV level, tau = 7.0 +- 1.4 psec; 472-keV level, tau = 233 +- 53 psec; ($sup 44$Ca): 3285-keV level, tau = 23 +- 7 psec, 2283-keV level, tau < 25 psec; ($sup 44$Sc): 631-keV level, tau = 550 +- 80 psec; 3567-keV level, tau = 51 +- 10 psec. The properties of the high spin states populated in the $sup 19$F + $sup 27$Al fusion- evaporation reaction are discussed. Relative excitation intensities of the residual nuclei are interpreted in terms of a Hauser-Feshbach calculation, while a simplified pairing force model allows us to explain a number of observations in specific nuclei. (AIP)
- Research Organization:
- University of Auckland, Auckland, New Zealand
- NSA Number:
- NSA-33-031737
- OSTI ID:
- 4013672
- Journal Information:
- Phys. Rev., C, v. 13, no. 3, pp. 1180-1193, Journal Name: Phys. Rev., C, v. 13, no. 3, pp. 1180-1193; ISSN PRVCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
*ALUMINIUM 27 TARGET-- FLUORINE 19 REACTIONS
*ALUMINIUM 27-- FLUORINE 19 REACTIONS
*CALCIUM 43-- HIGH SPIN STATES
*FLUORINE 19 REACTIONS-- FUSION REACTIONS
*SCANDIUM 43-- HIGH SPIN STATES
642205*
LIFETIME
N68451* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
20 <= A <= 38--Nuclear Reactions & Scattering
N68531 --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
39 <= A <= 58--Energy Levels & Transitions
NUCLEAR STRUCTURE
*ALUMINIUM 27-- FLUORINE 19 REACTIONS
*CALCIUM 43-- HIGH SPIN STATES
*FLUORINE 19 REACTIONS-- FUSION REACTIONS
*SCANDIUM 43-- HIGH SPIN STATES
642205*
LIFETIME
N68451* --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
20 <= A <= 38--Nuclear Reactions & Scattering
N68531 --Physics (Nuclear
Experimental)--Nuclear Properties & Reactions
39 <= A <= 58--Energy Levels & Transitions
NUCLEAR STRUCTURE