Muon Capture Processes for Carbon Atoms in C6H6 and C6H12
through the Muon Transfer Processes
M. Inagaki1#, K. Fujihara1, G. Yoshida1, K. Ninomiya1, Y. Kasamatsu1, M. K. Kubo2,
W. Higemoto3, N. Kawamura4, T. Nagatomo4, Y. Miyake4, T. Miura5, and A. Shinohara1
1
2
Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
Colleage of Liberal Arts, International Christian University, Mitaka, Tokyo 181-8585, Japan
3
Advanced Science Research Center, JAEA, Tokai, Ibaraki 319-1195, Japan
4
Institute of Materials Structure Science, KEK, Tsukuba, Ibaraki 305-0801, Japan
5
Radiation Science Center, KEK, Tsukuba, Ibaraki 305-0801, Japan
# a corresponding author: E-mail [email protected]
The negative muon capture process
through the muon transfer process for
benzene (C6H6) or cyclohexane (C6H12) was
studied. To examine the chemical effect on
the muon-capture process through a muon
transfer reaction, we selected liquid mixtures
of C6H6 or C6H12 and carbon tetrachloride
(CCl4) as the muon irradiation samples. The
muon
irradiation
experiments
were Fig. 1 Muonic X-ray intensity ratio for
pure CCl4, C6H12 + CCl4 (33%), and C6H6
performed at the MUSE D2 beam line of + CCl4 (33%) samples.
Materials and Life Science Experimental
Facility in J-PARC. Muonic X-rays emitted after muon-capture for carbon or chlorine atoms
were measured using high purity germanium detectors. Figure 1 shows X-ray intensity ratios
of muonic carbon to chlorine atoms. We found that the capture ratio of carbon atoms to
chlorine atoms (that corresponds to muonic X-ray intensity) in a C6H6 + CCl4 system is
approximately 1.5 times higher than that in a C6H12 + CCl4 system. This result can be
explained by assuming that the muon transfer rate for the carbon atoms of C6H6 was higher
than the rate for the carbon atoms of C6H12. This finding is consistent with our previous study
on the pion transfer process in the same sample system, in which different pion transfer rates
were obtained between C6H6 and C6H12 [1].
References
[1] A. Shinohara, T. Muroyama, T. Miura, T. Saito, A. Yokoyama, and M. Furukawa,
Hyperfine Interact. 106, 301 (1997).