Allowed partial transitions in muon capture by 28Si

Ciechanowicz, S.

doi:10.1016/0375-9474(76)90672-2

Cited by 21 publications

(11 citation statements)

References 14 publications

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“…Note that Ciechanowicz et al (1998) found the effects of soft-pion exchange were negligible. For comparison, the earlier calculations of Ciechanowicz (1976) and Parthasarathy and Sridhar (1981) gave values for g p /g a of 3.3 ± 1.0 and 1.5± 0.9 1.1 respectively.…”

Section: Recommended Values Of Gp/gamentioning

confidence: 99%

“…The first efforts were made by Ciechanowicz (1976) and Sridhar (1978, 1981), but employed relatively crude nuclear wave functions, the 1p-1h wave function of Donnelly and Walker (1970) and the truncated 1s-0d wave function of McGrory and Wildenthal (1971). More recently Kuz'min and Tetereva (2000), Kuz'min et al (2001), Siiskonen et al (1999), andCiechanowicz et al (1998) have conducted full 1s-0d calculations.…”

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confidence: 99%

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Induced pseudoscalar coupling of the proton weak interaction

2003

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The induced pseudoscalar coupling gp is the least well known of the weak coupling constants of the proton's charged-current interaction. Its size is dictated by chiral symmetry arguments, and its measurement represents an important test of quantum chromodynamics at low energies. During the past decade a large body of new data relevant to the coupling gp has been accumulated. This data includes measurements of radiative and non radiative muon capture on targets ranging from hydrogen and few-nucleon systems to complex nuclei. Herein the authors review the theoretical underpinnings of gp, the experimental studies of gp, and the procedures and uncertainties in extracting the coupling from data. Current puzzles are highlighted and future opportunities are discussed.

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Section: Recommended Values Of Gp/gamentioning

confidence: 99%

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confidence: 99%

Induced pseudoscalar coupling of the proton weak interaction

2003

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“…Based on this, there have been many attempts in the past to extract the ratio of the induced pseudoscalar and axial-vector coupling constants, C P /C A , from measured capture rates (see e.g. [1][2][3][4][5][6]) as well as from angular correlations of the gamma emission following the capture reaction A Z X N + µ − → A Z−1 X * N +1 + ν µ of polarized muons (see e.g. [7][8][9]).…”

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confidence: 99%

“…However, calculations with different nuclear models give very different predictions for this ratio. In [8] the values C P /C A = 3.4±1.0 and C P /C A = 2.0±1.6 were extracted using the matrix elements of [2,12], respectively. In addition, the measurement of [7] gives the estimates C P /C A = 5.3 ± 2.0 using the matrix elements of [2] and C P /C A = 4.2 ± 2.5 using the matrix elements of [12].…”

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confidence: 99%

Electron Microscopic Observation of Au–Cu Alloy Particles Produced by Coalescence between Au and Cu Smoke Particles

Kaito

Shiojiri

1982

Jpn. J. Appl. Phys.

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It has been proposed that the discrepancy between the partially conserved axialcurrent prediction and the nuclear shell-model calculations of the ratio C P /C A in the muon-capture reactions can be solved in the case of 28 Si by introducing effective transition operators. Recently there has been experimental interest in also measuring the required angular correlations in 20 Ne. Inspired by this, we have performed a shell-model analysis employing effective transition operators in the shell-model formalism for the transition 20 Ne(0 + g.s. ) + µ − → 20 F(1 + ; 1.057 MeV) + ν µ . Comparison of the calculated capture rates with existing data supports the use of effective transition operators. Based on our calculations, as soon as the experimental anisotropy data becomes available, the limits for the ratio C P /C A can be extracted.

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“…[8] the values C P /C A = 3.4 ± 1.0 and C P /C A = 2.0 ± 1.6 were extracted using the matrix elements of Refs. [2] and [12], respectively. In addition, the measurement of Ref.…”

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confidence: 99%

Shell-model effective operators for muon capture in²⁰Ne

Siiskonen

Suhonen

Hjorth‐Jensen

1999

J. Phys. G: Nucl. Part. Phys.

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It has been proposed that the discrepancy between the partially-conserved axialcurrent prediction and the nuclear shell-model calculations of the ratio C P /C A in the muon-capture reactions can be solved in the case of 28 Si by introducing effective transition operators. Recently there has been experimental interest in measuring the needed angular correlations also in 20 Ne. Inspired by this, we have performed a shellmodel analysis employing effective transition operators in the shell-model formalism for the transition 20 Ne(0 + g.s. ) + µ − → 20 F(1 + ; 1.057 MeV) + ν µ . Comparison of the calculated capture rates with existing data supports the use of effective transition operators. Based on our calculations, as soon as the experimental anisotropy data becomes available, the limits for the ratio C P /C A can be extracted. Key words: Shell model; Muon capture; Effective operatorsThe large energy release in the ordinary (non-radiative) capture of stopped negative muons by atomic nuclei probes the hadronic current much deeper than ordinary beta decay or electron capture. In particular, the role of the induced pseudoscalar coupling C P becomes important in muon capture. Based on this, there have been many attempts in the past to extract the ratio of the induced pseudoscalar and axial-vector coupling constants, C P /C A , from measured capture rates (see e.g. [1-6]) as well as from angular correlations of the gamma emission following the capture reaction A Z X N +µ − → A Z−1 X ′ * N +1 +ν µ of polarized muons (see e.g. [7][8][9]).The angular correlation data, available for muon capture in 28 Si, has been in a key role in pointing out discrepancies in the shell-model calculations of C P /C A . In various shell-model calculations (see e.g. [7,9] and references therein) anomalously small values of this ratio (C P /C A ∼ 0) have been obtained. In [9] we have proposed a method which, at least partly, lifts this discrepancy. This method is based on the use of effective transition operators

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Allowed partial transitions in muon capture by 28Si

Cited by 21 publications

References 14 publications

Induced pseudoscalar coupling of the proton weak interaction

Induced pseudoscalar coupling of the proton weak interaction

Electron Microscopic Observation of Au–Cu Alloy Particles Produced by Coalescence between Au and Cu Smoke Particles

Shell-model effective operators for muon capture in²⁰Ne

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Allowed partial transitions in muon capture by 28Si

Cited by 21 publications

References 14 publications

Induced pseudoscalar coupling of the proton weak interaction

Induced pseudoscalar coupling of the proton weak interaction

Electron Microscopic Observation of Au–Cu Alloy Particles Produced by Coalescence between Au and Cu Smoke Particles

Shell-model effective operators for muon capture in20Ne

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About

Shell-model effective operators for muon capture in²⁰Ne