ft value of the 0{sup +}{yields}0{sup +} {beta}{sup +} decay of {sup 32}Ar: A measurement of isospin symmetry breaking in a superallowed decay
- Brookhaven National Laboratory, P. O. Box 5000, Upton, New York 11973-5000 (United States)
- Physics Department, University of Washington, Seattle, Washington 98195 (United States)
- Department of Physics and Astronomy, DePauw University, Greencastle, Indiana 46135 (United States)
- Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 (United States)
- Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
- Instituto de Fisica, University of Sao Paulo, C. P. 05389-970, Sao Paulo (Brazil)
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
We determined the absolute branch of the T=2 superallowed decay of {sup 32}Ar by detecting the {beta}{sup +}-delayed protons and {gamma} decays of the daughter state. We obtain b{sub SA}{sup {beta}}=(22.71{+-}0.16)%, which represents the first determination of a proton branch to better than 1%. Using this branch along with the previously determined {sup 32}Ar half-life and energy release, we determined ft=(1552{+-}12) s for the superallowed decay. This ft value, together with the corrected Ft value extracted from previously known T=1 superallowed decays, yields a measurement of the isospin symmetry breaking correction in {sup 32}Ar decay {delta}{sub C}{sup exp}=(2.1{+-}0.8)%. This can be compared to a theoretical calculation {delta}{sub C}=(2.0{+-}0.4)%. As by-products of this work, we determined the {gamma} and proton branches for the decay of the lowest T=2 state of {sup 32}Cl, made a precise determination of the total proton branch and relative intensities of proton groups that leave {sup 31}S in its first excited state and deduced an improved value for the {sup 32}Cl mass.
- OSTI ID:
- 21191987
- Journal Information:
- Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 77; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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