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Phys. Rev. C 77, 065503 (2008) [15 pages]

ft value of the 0+→0+ β+ decay of 32Ar: A measurement of isospin symmetry breaking in a superallowed decay

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M. Bhattacharya1,2, D. Melconian2,3,*, A. Komives4,5, S. Triambak2, A. García2,5, E. G. Adelberger2, B. A. Brown6,7, M. W. Cooper8, T. Glasmacher6,7, V. Guimaraes9, P. F. Mantica7,10, A. M. Oros-Peusquens7,†, J. I. Prisciandaro7,10, M. Steiner7, H. E. Swanson2, S. L. Tabor8, and M. Wiedeking8
1Brookhaven National Laboratory, P. O. Box 5000, Upton, New York 11973-5000, USA
2Physics Department, University of Washington, Seattle, Washington 98195, USA
3Department of Physics, Texas A&M University, College Station, Texas 77843-3366, USA
4Department of Physics and Astronomy, DePauw University, Greencastle, Indiana 46135, USA
5Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA
6Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
7National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
8Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
9Instituto de Fisica, University of São Paulo, C. P. 05389-970, São Paulo, Brazil
10Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA

Received 3 April 2008; published 24 June 2008

We determined the absolute branch of the T=2 superallowed decay of 32Ar by detecting the β+-delayed protons and γ decays of the daughter state. We obtain bSAβ=(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 32Ar 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 32Ar decay δCexp=(2.1±0.8)%. This can be compared to a theoretical calculation δC=(2.0±0.4)%. As by-products of this work, we determined the γ and proton branches for the decay of the lowest T=2 state of 32Cl, made a precise determination of the total proton branch and relative intensities of proton groups that leave 31S in its first excited state and deduced an improved value for the 32Cl mass.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.77.065503
DOI:
10.1103/PhysRevC.77.065503
PACS:
23.50.+z, 23.40.-s, 23.20.Lv, 27.30.+t

*dmelconian@physics.tamu.edu

†Present address: Institute of Medicine

 
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