Hyperine transitions rates and capture rates in muonic F, Na, and Cl
From the time spectrum of {gamma}-rays following muon capture the authors have measured hyperfine transitions rates on muonic F, Na, and Cl, and the hyperfine dependence of the reaction {mu}{sup {minus}} {sup 23}Na(3/2{sup +},0) {r_arrow} {nu}{sup 23}Ne({1/2}{sup +},1017). They obtained hyperfine transition rates of 4.9{+-}1.2 {mu}s{sup {minus}1}, 8.4{+-}1.9 {mu}s{sup {minus}1}, and 6.5{+-}0.9 {mu}s{sup {minus}1}, for muonic F, Na, and Cl, respectively. The pattern of rates is in agreement with the calculations of Winston which indicate a general increase in rate with atomic number but a decrease at Cl where the emission of L shell electrons becomes forbidden. However, the authors` measured rates are systematically lower than the calculations of Winston (by 15 to 40 %), perhaps due to incomplete refilling of the muonic atom`s electron shells after formation. The hyperfine dependence of the reaction {mu}{sup {minus}} {sup 23}Na (3/2{sup +},0) {r_arrow} {nu} {sup 23}Ne({1/2}{sup +},1017) is dependent on the weak pseudoscalar coupling (g{sub p}) of the proton, and in an initial measurement at the TRIUMF laboratory gave a hyperfine dependence, {Lambda}{sub +}/{Lambda}{sub {minus}} = 0.18 {+-} 0.10, and a weak pseudoscalar coupling 5 {le} g{sub p}/g{sub e} {le} 15. A more recent measurement will determine g{sub p} to about 10 %, and will probe modifications of the coupling in the nuclear medium.
- OSTI ID:
- 243516
- Report Number(s):
- CONF-9304297--
- Journal Information:
- Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 2 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
- Country of Publication:
- United States
- Language:
- English
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