Radiative Muon Capture and the Induced Pseudoscalar Coupling in Nuclei

Döbeli, M.; Doser, M.; Elmbt, Larry van; Schaad, M. W.; Truöl, P.; Bay, A.; Perroud, J. P.; Imazato, J.

doi:10.1007/978-3-642-71689-8_163

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“…Unfortunately, this pileup effect was not discovered until the publication of preliminary results at two different conferences: a partial branching ratio of (6.5 ± 1.3) xlO -5 was given in reference [124] and an even higher value of (9.3 ± 1.9) xlO~" 5 was given in reference [126]. 40 Ca for the appropriate value of g p /g a .…”

Section: Ie Omentioning

confidence: 99%

“…The results are given in Table 5 Figure 5.19: Photon energy spectrum from 12 C, 0.6 mm converter, compared to the best fits from the spectrum fitting method. Labels as for 5.18 and the later value of (10.6 ± 3.0) xlO -5 [126] were based on data from the single Nal(Tl) and are therefore erroneous. Again, these preliminary results were quoted in the review by Gmitro and Truol [52] and were considered by those authors to add evidence of a systematic renormalization (upwards) of g p in light nuclei (even without a theoretical calculation specific to 12 C, it would be difficult to reconcile branching ratios this large with the Goldberger-Treiman value of g p /g a )•…”

Section: Cmentioning

confidence: 99%

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Radiative muon capture on carbon, oxygen, and calcium

Armstrong¹,

Ahmad²,

Burnham³

et al. 1991

Phys. Rev. C

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The photon energy spectra fro111 radiative xxluon captBle on C, 0, and Ca llave bee11 measured using a. time projection chamber as a pair spectrometer. The branching ratio for radiative muon capture is sensitive to g", the induced pseudoscalar coupling constant of the weak interaction, Expressed in terms of the axial-vector weak coupling constant g, values of g"/go = 5.7 6 0.8 and gJ, /g = 7.3 + 0.9 are obtained for Ca. and ' 0, respectively, from comparison with phenomenological calculations of the nuclear response. Froxxi comparison with microscopic calculations, values of g&/g~= 4.6 + 1.8, 13.6 +~s , and 16.2 +o'7 for Ca. , ' 0, and C, respectively, are obtained. The microscopic results are suggestive of a renormalization of the nucleonic form factors within the nucleus.

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Section: Ie Omentioning

confidence: 99%

Section: Cmentioning

confidence: 99%