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Title: Charged Particle Spectra from $$\mu^{-}$$ Capture on Al

Abstract

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 $$\mu^{-}$$ 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 $$0.0322\pm0.0007(\text{stat})\pm0.0022(\text{syst})$$ per capture, and for deuterons above 130 MeV/c (4.5 MeV) it is $$0.0122\pm0.0009(\text{stat})\pm0.0006(\text{syst})$$. Extrapolating to total yields gives $$0.045\pm0.001(\text{stat})\pm0.003(\text{syst}) \pm 0.001(\text{extrapolation})$$ per capture for protons and $$0.018\pm0.001(\text{stat})\pm0.001(\text{syst})\pm 0.002(\text{extrapolation})$$ for deuterons, which are the most precise measurements of these quantities to date.

Authors:
ORCiD logo [1];  [2];  [3];  [2];  [2];  [2]
  1. Fermilab
  2. TRIUMF
  3. Victoria U.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1565951
Report Number(s):
arXiv:1908.06902; FERMILAB-PUB-19-433-E
oai:inspirehep.net:1750022
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
TBD
Additional Journal Information:
Journal Name: TBD
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Gaponenko, A., Grossheim, A., Hillairet, A., Marshall, G. M., Mischke, R. E., and Olin, A. Charged Particle Spectra from $\mu^{-}$ Capture on Al. United States: N. p., 2019. Web.
Gaponenko, A., Grossheim, A., Hillairet, A., Marshall, G. M., Mischke, R. E., & Olin, A. Charged Particle Spectra from $\mu^{-}$ Capture on Al. United States.
Gaponenko, A., Grossheim, A., Hillairet, A., Marshall, G. M., Mischke, R. E., and Olin, A. Mon . "Charged Particle Spectra from $\mu^{-}$ Capture on Al". United States. https://www.osti.gov/servlets/purl/1565951.
@article{osti_1565951,
title = {Charged Particle Spectra from $\mu^{-}$ Capture on Al},
author = {Gaponenko, A. and Grossheim, A. and Hillairet, A. and Marshall, G. M. and Mischke, R. E. and Olin, A.},
abstractNote = {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 $\mu^{-}$ 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 $0.0322\pm0.0007(\text{stat})\pm0.0022(\text{syst})$ per capture, and for deuterons above 130 MeV/c (4.5 MeV) it is $0.0122\pm0.0009(\text{stat})\pm0.0006(\text{syst})$. Extrapolating to total yields gives $0.045\pm0.001(\text{stat})\pm0.003(\text{syst}) \pm 0.001(\text{extrapolation})$ per capture for protons and $0.018\pm0.001(\text{stat})\pm0.001(\text{syst})\pm 0.002(\text{extrapolation})$ for deuterons, which are the most precise measurements of these quantities to date.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {8}
}