Muon capture in 28Si and gp/ga

B. A. Moftah, E. Gete, D. F. Measday, D. S. Armstrong, J. Bauer, T. P. Gorringe, B. L. Johnson, B. Siebels, S. Stanislaus

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Negative muon capture in 28Si was used to determine the angular correlation between the neutrino and the 1229 keV γ-ray from the de-excitation of the 2201 keV 1+ level in 28Al. To suppress backgrounds in the HPGe detectors, a coincidence was required with the 942 keV γ-ray in the de-excitation cascade detected in a NaI array. The extracted angular correlation coefficient a is 0.360 ± 0.059, consistent with previous measurements. Using a recent shell model calculation employing a full 1s-0d model space and the USD empirical interaction, this value of a implies a value for the induced pseudoscalar coupling of gp/ga = 0.0 ± 3.2, substantially smaller than the prediction of PCAC and pion-pole dominance.

Original languageEnglish
Pages (from-to)157-162
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume395
Issue number3-4
DOIs
StatePublished - Mar 13 1997

Bibliographical note

Funding Information:
This experiment was conducted with the financial assistanceo f theN atural Sciencesa nd Engineering Re-searchC ouncil of Canada,t he National Science Foundation, USA, and the Department of Energy, USA, which are hereby gratefully acknowledged.

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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