Chemical effect on muonic atom formation through muon transfer reaction in benzene and cyclohexane samples
Author:
Inagaki Makoto12, Ninomiya Kazuhiko2, Nambu Akihiro2, Kudo Takuto2, Terada Kentaro2, Sato Akira2, Kawashima Yoshitaka3, Tomono Dai3, Shinohara Atsushi2
Affiliation:
1. Institute for Integrated Radiation and Nuclear Science , Kyoto University , Kumatori, Sennan , Osaka 590-0494 , Japan 2. Graduate School of Science , Osaka University , Toyonaka , Osaka 560-0043 , Japan 3. Research Center for Nuclear Physics , Osaka University , Ibaraki , Osaka 567-0047 , Japan
Abstract
Abstract
To investigate the chemical effect on the muon capture process through a muon transfer reaction from a muonic hydrogen atom, the formation rate of muonic carbon atoms is measured for benzene and cyclohexane molecules in liquid samples. The muon transfer rate to carbon atoms of the benzene molecule is higher than that to the carbon atoms of the cyclohexane molecule. Such a deviation has never been observed among those molecules for gas samples. This may be because the transfers occur from the excited states of muonic hydrogen atoms in the liquid system, whereas in the gas system, all the transfers occur from the 1s (ground) state of muon hydrogen atoms. The muonic hydrogen atoms in the excited states have a larger radius than those in the 1s state and are therefore considered to be affected by the steric hindrance of the molecular structure. This indicates that the excited states of muonic hydrogen atoms contribute significantly to the chemical effects on the muon transfer reaction.
Publisher
Walter de Gruyter GmbH
Subject
Physical and Theoretical Chemistry
Reference38 articles.
1. Kubo, M. K. The positive muon as a chemical and magnetic probe of metal complexes and the negative muon as a unique tool for elemental analysis. Anal. Sci. 2002, 17, i653; https://doi.org/10.14891/analscisp.17icas.0.i653.0. 2. Kubo, M. K., Moriyama, H., Tsuruoka, Y., Sakamoto, S., Koseto, E., Saito, T., Nishiyama, K. Non-destructive elemental depth-profiling with muonic X-rays. J. Radioanal. Nucl. Chem. 2008, 278, 777. https://doi.org/10.1007/s10967-008-1610-x. 3. Ninomiya, K., Nagatomo, T., Kubo, K., Ito, T. U., Higemoto, W., Kita, M., Shinohara, A., Strasser, P., Kawamura, N., Shimomura, K., Miyake, Y., Saito, T. Development of nondestructive and quantitative elemental analysis method using calibration curve between muonic X-ray intensity and elemental composition in bronze. Bull. Chem. Soc. Jpn. 2012, 85, 228. https://doi.org/10.1246/bcsj.20110151. 4. Terada, K., Ninomiya, K., Osawa, T., Tachibana, S., Miyake, Y., Kubo, M. K., Kawamura, N., Higemoto, W., Tsuchiyama, A., Ebihara, M., Uesugi, M. A new X-ray fluorescence spectroscopy for extraterrestrial materials using a muon beam. Sci. Rep. 2014, 4, 5072. https://doi.org/10.1038/srep05072. 5. Ninomiya, K., Kubo, M. K., Nagatomo, T., Higemoto, W., Ito, T. U., Kawamura, N., Strasser, P., Shimomura, K., Miyake, Y., Suzuki, T., Kobayashi, Y., Sakamoto, S., Shinohara, A., Saito, T. Nondestructive elemental depth-profiling analysis by muonic X-ray measurement. Anal. Chem. 2015, 87, 4597. https://doi.org/10.1021/acs.analchem.5b01169.
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