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Measurement of atomic capture probabilities of negative pions in metal hydrides |
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| Authors: | Tadashi Saito Taichi Miura Atsushi Shinohara Junichiro Shintai Eugene Taniguchi Michiaki Furukawa Kazuhiro Takesako Nobutsugu Imanishi Hisakazu Muramatsu Yoshio Yoshimura Hiroshi Baba Hidekazu Doe |
| Institution: | (1) Department of Chemistry and Laboratory of Nuclear Studies, Faculty of Science, Osaka University, Toyonaka, 560 Osaka, Japan;(2) Radioisotope Research Center, Osaka University, Toyonaka, 560 Osaka, Japan;(3) National Laboratory for High Energy Physics (KEK), Tsukuba, 305 Ibaraki, Japan;(4) Department of Chemistry, Faculty of Science, Nagoya University, Chikusa-ku, 464-01 Nagoya, Japan;(5) Department of Nuclear Engineering, Faculty of Engineering, Kyoto University, Sakyo-ku, 606 Kyoto, Japan;(6) Faculty of Education, Shinshu University, 380 Nagano, Japan;(7) Department of Chemistry, Faculty of Science, Osaka City University, Sumiyoshi-ku, 558 Osaka, Japan |
| Abstract: | Atomic capture probabilities of negative pions in some metal hydrides were measured. The capture by a hydrogen atom was detected by means of a pair of the annihilation  rays of  0 which had been produced by the charge-exchange reaction of – with the capturing hydrogen nucleus (proton). This method ensures a high sensitivity and reliability of the measurements. The probabilities obtained were in agreement with previous measurements except for palladium hydride, which showed a much smaller probability than that given in the literature. The atomic capture of – is well described in the framework of the large mesic molecular model, in which the proportionality constant reflects the chemical states of the capturing atoms and also the neighboring ones. |
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