Energetic charged-particle spectrum following<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>capture by nuclei

Krane, K. S.; Sharma, T.C.; Swenson, L.W.; McDaniels, D.K.; Varghese, P.; Wood, B. E.; Silbar, Richard R.; Wohlfahrt, Helmut; Goulding, C.A.

doi:10.1103/physrevc.20.1873

Cited by 14 publications

(6 citation statements)

References 16 publications

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“…Figure 12 reproduces data points and the fit from that paper, along with our proton and deuteron results converted to kinetic energy spectra. While the slope of the fit in [20] agrees with that of our p+d curve, the previously reported yield around 40 MeV is significantly higher. Figure 12 also shows that the MECO spectrum [23] provides, withing the uncertainties, an upper bound on the sum of proton and deuteron emission.…”

Section: G Other Effectssupporting

confidence: 91%

“…A measurement of the energy spectrum of charged particles from muon capture on aluminum above 40 MeV is reported in [20]. Figure 12 reproduces data points and the fit from that paper, along with our proton and deuteron results converted to kinetic energy spectra.…”

Section: G Other Effectssupporting

confidence: 68%

“…Another spectrum measurement with an active target was done by stopping negative muons in a silicon detector [18]. Measurements with external scintillator calorimeters were done for multiple elemental targets, see [19,20] and references therein. However, they were only able to detect a small high energy tail of the charged particle spectrum, with the bulk of the spectrum being below the detector threshold.…”

Section: Introductionmentioning

confidence: 99%

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Charged-particle spectra fromμ−capture on Al

et al. 2020

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Published data on the emission of charged particles following nuclear muon capture are extremely limited. In addition to its interest as a probe of the nuclear response, these data are important for the design of some current searches for lepton flavor violation. This work presents momentum spectra of protons and deuterons following µ − capture in aluminum. It is the first measurement of a muon capture process performed with a tracking spectrometer. A precision of better than 10% over the momentum range of 100-190 MeV/c for protons is obtained; for deuterons of 145-250 MeV/c the precision is better than 20%. The observed partial yield of protons with emission momenta above 80 MeV/c (kinetic energy 3.4 MeV) is 0.0322 ± 0.0007(stat) ± 0.0022(syst) per capture, and for deuterons above 130 MeV/c (4.5 MeV) it is 0.0122 ± 0.0009(stat) ± 0.0006(syst). Extrapolating to total yields gives 0.045 ± 0.001(stat) ± 0.003(syst) ± 0.001(extrapolation) per capture for protons and 0.018±0.001(stat)±0.001(syst)±0.002(extrapolation) for deuterons, which are the most precise measurements of these quantities to date. * gandr@fnal.gov † Affiliated with:

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Section: G Other Effectssupporting

confidence: 91%

Section: G Other Effectssupporting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

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Charged-particle spectra fromμ−capture on Al

et al. 2020

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“…An interesting feature of such nuclear decays is the emission of high-energy (40 − 70 MeV) charged particles (protons, deuterons) [12,13,14,15,16,17]. By studying such an emission resulting from nuclear muon capture it is possible to get information both on the nuclear structure and the muon capture mechanism itself [2,3].…”

Section: Introductionmentioning

confidence: 99%

Muon capture by3Henuclei followed by proton and deuteron production

et al. 2004

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“…Unfortunately, previous experimental results are not directly relevant to COMET and Mu2e. The results are either from materials other than aluminum [14][15][16], had no particle identification [17,18], or the spectrum was only measured at high energies [19]. A recent measurement of the proton and deuteron momentum spectra from muon capture on aluminum from TWIST [20] has improved the picture.…”

Section: Introductionmentioning

confidence: 99%

Measurement of proton, deuteron, triton, and α particle emission after nuclear muon capture on Al, Si, and Ti with the AlCap experiment

Edmonds¹,

Quirk²,

Wong³

et al. 2022

Phys. Rev. C

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Background: Heavy charged particles after nuclear muon capture are an important nuclear physics background to the muon-to-electron conversion experiments Mu2e and COMET, which will search for charged lepton flavor violation at an unprecedented level of sensitivity. Purpose: The AlCap experiment aimed to measure the yield and energy spectra of protons, deuterons, tritons, and α particles emitted after the nuclear capture of muons stopped in Al, Si, and Ti in the low-energy range relevant for the muon-to-electron conversion experiments. Methods: Individual charged particle types were identified in layered silicon detector packages and their initial energy distributions were unfolded from the observed energy spectra. Results: The proton yields per muon capture were determined as Y p (Al) = 26.64(28 stat.)(77 syst.) × 10 −3 and Y p (Ti) = 26.48(35)(80) × 10 −3 in the energy range 3.5-20.0 MeV, and as Y p (Si) = 52.5(6)(18) × 10 −3 in the energy range 4.0-20.0 MeV. Detailed information on yields and energy spectra for all observed nuclei are presented in the paper. Conclusions: The yields in the candidate muon stopping targets, Al and Ti, are approximately half of that in Si, which was used in the past to estimate this background. The reduced background allows for less shielding and a better energy resolution in these experiments. It is anticipated that the comprehensive information presented in this paper will stimulate modern theoretical calculations of the rare process of muon capture with charged particle emission and inform the design of future muon-to-electron conversion experiments.

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Energetic charged-particle spectrum followingμ−capture by nuclei

Cited by 14 publications

References 16 publications

Charged-particle spectra fromμ−capture on Al

Charged-particle spectra fromμ−capture on Al

Muon capture by3Henuclei followed by proton and deuteron production

Measurement of proton, deuteron, triton, and α particle emission after nuclear muon capture on Al, Si, and Ti with the AlCap experiment

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