Summary
The rates of the muon capture reactions: µ+ 32 He→ 31 +v, µ−+ 63 Li→ 62 He+v, µ−+ 126 C→ 125 B+v, with the daughter nuclei formed in their ground states, are calculated assuming ≪ universality ≫ between muon-bare nucleon and electron-bare nucleon coupling constants. The ≪ induced ≫ pseudoscalar interaction and the additional terms arising from the assumption of a ≪ conserved vector current ≫ are included in the muon-nucleon effective Hamiltonian. The ratios of the nuclear matrix elements for the muon captures and for the corresponding ß-decays are first estimated in an approximately ≪ model independent ≫ fashion using appropriate nuclear proton density distribution functions and then evaluated in more detail on the basis of variational trial wave functions for 32 He, 31 H, and of LS coupling andjj coupling shell model wave functions (with configuration mixing) for 63 Li, 62 He, and 126 C, 125 B, respectively. The calculated capture rate for µ−+ 126 C → 125 B+v is in agreement with experiment — experiments however are not yet available in the other two cases.
Riassunto
Si calcolano le percentuali delle reazioni per cattura di muoni: µ§−+ 32 He → 31 H+v, µ−+ 63 Li→ 62 He+v, µ−+ 125 .C → 125 B + v, coi nuclei che ne derivano prodotti nei loro stati fondamentali assumendo 1’≪ universalitá ≫ tra le costanti d’accoppiamento muonenueleone nudo ed elettrone-nucleone nudo. L’interazione pseudoscalare ≪ indotta ≫ e i termini addizionali derivanti dall’assunzione di una ≪ corrente vettoriale conservata ≫ sono inclusi nell’Hamiltoniana effettiva muone-nucleone. I rapporti degli elementi della materia nucleare per le catture dei muoni e pei corrispondenti decadimenti ß si stimano dapprima in modo approssimato ≪ indipendentemente da modelli ≫ usando opportune funzioni di distribuzione della densità protonica nucleare e poi si calcolano più dettagliatamente sulla base di funzioni d’onda variazionali di prova per 32 He, 31 H, e funzioni d’onda d’accoppiamento LS ejj del modello a shell (con mistura di configurazioni) per 63 Li, 62 He e 126 C, 125 B rispettivamente. La percentuale di cattura calcolata per.π−+ 126 C→ 125 B+v si accorda con l’esperienza; mancano, tuttavia le esperienze per gli altri due casi.
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Supported in part by the Air Force Office of Scientific Eesearch, Air Eesearch and Development Command.
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Fujii, A., Primakoff, H. Muon capture in certain light nuclei. Il Nuovo Cimento (1955-1965) 12, 327–355 (1959). https://doi.org/10.1007/BF02745906
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DOI: https://doi.org/10.1007/BF02745906