This research was sponsored by the National Science Foundation Grant NSF PHY 87-1440

Byrd, R.

Carey, T.

Ciskowski, D.

Goodman, C.D.

Huang, W.

Krofcheck, D.

McClelland, J.

Rapaport, J.

Rybarcyk, L.

Sakai, H.

Sugarbaker, E.

Taddeucci, T.N.

Wagner, A.J.

English

IUScholarWorks

MEASUREMENT OF B(GT) /B(F) FOR THE ANOMALOUS 5 ~ r  p+ DECAY VIA THE (p ,n) REACTION 
A.J. Wagner, E. Sugarbaker, D. Krofcheck and L. Rybarcyk 
The Ohio State University, Columbus, Ohio 43210 
R. Byrd, C.D. Goodman and W. Huang 
Indiana University Cyclotron Facility, Bloomington, Indiana 47405 
T. Carey, J. McClelland, H. ~akait and T.N. Taddeucci 
Los Alamos National Laboratory, Los Alamos, New Mexico 87545 
J. Rapaport 
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830 
D. Ciskowski 
University of Texas, Austin, Texas 78712 
I The value of the vector coupling constant Gv In either case this is a small GT component relative to I deduced from the 3/2+ + 3/2+ 35~r(p+)35~l(g.s.) decay the B(F) = 1 for this transition. However, a I is about 3% larger than that inferred from numerous significant enhancement of OGT to OF is expected in the 
superallowed O+ + 0+ decays .l The three other precise (p,n) reaction at this bombarding energy.5 The two 
measurements of J + J > 0 transitions involving mixed values of B(GT) imply, respectively, values of ~~(0') 
1 Fermi (F) and Gamow-Teller (GT) decays lead to values of 0.196 + 0.003 and 0.065 + 0.014 for the 
of Gv consistent with the "normal", superallowed 35~l(p,n)35~r(g.s.) transition. Based on a preliminary 
I values. This anomalously high value of Gv in the 3 5 ~ r  data reduction, our expeirmental value of SW(O0) may . 
decay would, interestingly, imply a vanishing of the be larger than either of these expected values, 
I Cabbibo angle (0.03 2 0.09). This result is based on possibly suggesting contributions in addition to GT and 
measurements of electron asymmetry in the beta decay of F strength to the O0 cross section data for this 
I polarized nuclei to determine the ratio of GT to F particular transition. To further investigate this 
transition strength in the mixed decay. We recently issue, we have also measured angular distributions of 
I showed that the transverse spin-flip probability the differential cross section for this reaction at I SNN(OO) for the analogous (p ,n )  reaction at IUCF Ep = 120 MeV. A complete analysis of all the available I energies can also be used to extract the fraction of GT data is currently in progress. 
strength contributing to such a mixed tran~ition.~ We 
t~ermanent address : Research Center for Nuclear 
therefore wish to address the 3 5 ~ r  anomaly in a manner Physics, Osaka, University, Mihogaoka, Osala 567, 
Japan. 
independent of the beta decay results. 
1) E. Hagberg, et al., Nucl. Phys. A313, 276 (1979). 
The transverse polarization transfer for the 
2) E. Adelburger, et al., Phys. Rev. Lett. 55, 2129 
35~l(p,n)35~r reaction has been measured for Ep = 160 (1985). 
MeV and O = 0". The neutron flight path to a neutron 3) C. Goodman, et al., Phys. Rev. Lett. 54, 877 
(1985). 
detector polarimeter4 was approximately 90 m and the 
4) T.N. Taddeucci, et al., Nucl. Instr. Meth. A241, 
energy resolution achieved was about 800 keV. Using 448 (1985). 
only the known ft value and the "normal" value of Gv, 5) T.N. Taddeucci, et al., Phys. Rev. C 25, 1094 
(1982). 
we expect a value of B(GT) = 0.050 + 0.001, while an 
increase of Gv by 3% would suggest B(GT) = 0.011 2 0.003. 


Measurement of B(GT)/B(F) for the Anomalous 35-Ar β+ Decay via the (p,n) Reaction

https://scholarworks.iu.edu/dspace/bitstream/2022/905/1/iucf_1986_28.pdf

Measurement of B(GT)/B(F) for the Anomalous 35-Ar β+ Decay via the (p,n) Reaction

Abstract

Similar works

Full text

Available Versions

IUScholarWorks