The beta-delayed proton decay of {sup 23}Al
- Lawrence Berkeley Laboratory, CA (United States)
The A=4n+3, T{sub z}= -3/2 series of beta-delayed proton emitters are excellent candidates for the experimental study of Gamow-Teller (GT) beta decay. The lightest known member of this series, {sup 23}Al, was first observed using a standard Si-{Delta}E Si-E telescope, with a resulting proton threshold of {approx}700 keV. The 820 keV proton group observed corresponds to an excited state in {sup 23}Mg at 8.43 MeV, 640 keV above the Isobaric Analog State (IAS). Proton decay from the IAS is open by 210 keV and is predicted to have a partial width comparable with the competing 7.79 MeV M1 gamma transition. Recent shell model calculations for {sup 23}Al suggest a very strong GT transition should result in a low-energy beta-delayed proton group. Using our new detector ball, consisting of six gas-{Delta}E gas-{Delta}E Si-E triple telescopes each capable of detecting protons down to {approx}150 keV, we have searched for new low-energy proton groups from {sup 23}Al decay. {sup 23}Al was produced through the {sup 24}Mg(p,2n) reaction at E{sub p} = 40 MeV and transported via He-jet to the center of our detector ball. We have observed several proton groups below 700 keV and new T{sub {1/2}} measurements should allow us to establish a definite assignment.
- OSTI ID:
- 387188
- Report Number(s):
- CONF-931044-; ISSN 0003-0503; TRN: 96:027132
- Journal Information:
- Bulletin of the American Physical Society, Vol. 38, Issue 9; Conference: Fall meeting of the Division of Nuclear Physics of the American Physical Society, Pacific Grove, CA (United States), 20-23 Oct 1993; Other Information: PBD: Oct 1993
- Country of Publication:
- United States
- Language:
- English
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