### Session CF: Electroweak Interactions I

9:00 AM–11:36 AM, Friday, October 27, 2006
Gaylord Opryland Room: Hermitage C

Chair: Geoff Greene, Oak Ridge National Laboratory

Abstract ID: BAPS.2006.DNP.CF.3

### Abstract: CF.00003 : Measurement of the $\gamma$ branches in the $\beta^+$ decay of $^{\mathrm 32}$Cl

9:24 AM–9:36 AM

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#### Authors:

Dan Melconian
C. Bordeanu
A. Garc\'ia
(University of Washington)

J.C. Hardy
V.E. Iacob
N. Nica
H.I. Park
G. Tabacaru
L. Trache
(Texas A \& M University)

S. Triambak
(University of Washington)

R.E. Tribble
Y. Zhai
(Texas A \& M University)

As discussed in the previous talk (A.~Garc\'ia, et al.), one of the dominant systematic uncertainties in the measurement of the $ft$ value of $^{\mathrm 32}$Ar arises from the uncertainty in the HPGe $\gamma$ efficiency. The $\gamma$s emitted in the decay of $^{\mathrm 32}$Cl cover the same range of energies and, since $\approx10\%$ of the time it is a daughter product of $^{\mathrm 32}$Ar, a precise knowledge of these branches will provide us with an \emph{in situ} calibration of our HPGe detectors. This talk will describe the experiment and results of the measurement performed at the Texas A \& M Cylcotron Institute. We have identified a number of new branches and determined the $\gamma$ yields to $<0.3\%$, generally an order of magnitude improvement from previous results. Implications for the $^{\mathrm 32}$Ar experiment will be discussed.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2006.DNP.CF.3