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Journal Articles

Negative muonium ion production with a C12A7 electride film

Otani, Masashi*; Fukao, Yoshinori*; Futatsukawa, Kenta*; Kawamura, Naritoshi*; Matoba, Shiro*; Mibe, Tsutomu*; Miyake, Yasuhiro*; Shimomura, Koichiro*; Yamazaki, Takayuki*; Hasegawa, Kazuo; et al.

Journal of Physics; Conference Series, 1350, p.012067_1 - 012067_6, 2019/12

 Times Cited Count:0 Percentile:100

Negative muonium atom ($$mu^+$$e$$^-$$e$$^-$$, Mu$$^-$$) has unique features stimulating potential interesting for several scientific fields. Since its discovery in late 1980's in vacuum, it has been discussed that the production efficiency would be improved using a low-work function material. C12A7 was a well-known insulator as a constituent of alumina cement, but was recently confirmed to exhibit electric conductivity by electron doping. The C12A7 electride has relatively low-work function (2.9 eV). In this paper, the negative muonium production measurement with several materials including a C12A7 electride film will be presented. Measured production rate of the Mu$$^-$$ were 10$$^{-3}$$/s for all the Al, electride, and SUS target. Significant enhancement on electride target was not observed, thus it is presumed that the surface condition should be more carefully treated. There was no material dependence of the Mu$$^-$$ averaged energy: it was 0.2$$pm$$0.1keV.

Journal Articles

Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex, 4; The Muon Facility

Higemoto, Wataru; Kadono, Ryosuke*; Kawamura, Naritoshi*; Koda, Akihiro*; Kojima, Kenji*; Makimura, Shunsuke*; Matoba, Shiro*; Miyake, Yasuhiro*; Shimomura, Koichiro*; Strasser, P.*

Quantum Beam Science (Internet), 1(1), p.11_1 - 11_24, 2017/06

A muon experimental facility, known as the Muon Science Establishment (MUSE), is one of the user facilities at the Japan Proton Accelerator Research Complex, along with those for neutrons, hadrons, and neutrinos. The MUSE facility is integrated into the Materials and Life Science Facility building in which a high-energy proton beam that is shared with a neutron experiment facility delivers a variety of muon beams for research covering diverse scientific fields. In this review, we present the current status of MUSE, which is still in the process of being developed into its fully fledged form.

Journal Articles

Coulomb explosion process in collision of a swift cluster ion with gas target

Chiba, Atsuya; Narumi, Kazumasa; Yamada, Keisuke; Matoba, Shiro; Saito, Yuichi

JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 167, 2014/03

Coulomb explosion caused in an early phase affects the subsequent process significantly in the interaction of a swift cluster ion with a material, so it is considered that the Coulomb explosion is one of the most important phenomena on understanding the mechanisms of the irradiation effects on the cluster ion bombardment. In experiments, charge states and spatial distributions of C$$_{2}$$$$^{+}$$ constituent ions dissociated by the collision with an atom in a gas target were measured on the event-by-event basis. After the trajectory analysis of the constituent ions using a simulation model, it turned out that the interatomic distance of the constituent ions grows approximately 1.5 times as long as the ground state, before they dissociate.

Journal Articles

Status report on technical developments of electrostatic accelerators

Yamada, Keisuke; Saito, Yuichi; Ishii, Yasuyuki; Matoba, Shiro; Chiba, Atsuya; Yokoyama, Akihito; Usui, Aya; Sato, Takahiro; Okubo, Takeru; Uno, Sadanori

JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 159, 2014/03

no abstracts in English

Oral presentation

Absolute detection efficiency of a tapered microchannel plate

Matoba, Shiro

no journal, , 

no abstracts in English

Oral presentation

Measurement of absolute detection efficiency using a high sensitivity micro-channel plate

Matoba, Shiro; Moriya, Sosuke*; Takahashi, Karin*; Ishikawa, Manabu*; Koizumi, Tetsuo*; Shiromaru, Haruo*

no journal, , 

no abstracts in English

Oral presentation

Oral presentation

Absolute detection efficiency of a high sensitivity microchannel plate

Matoba, Shiro; Moriya, Sosuke*; Koizumi, Tetsuo*; Ishikawa, Manabu*; Takahashi, Karin*; Shiromaru, Haruo*

no journal, , 

Oral presentation

Thickness dependence of secondary-electron yield from carbon foils bombarded with 62.5-250-keV/u H$$_{2}$$$$^{+}$$ and C$$_{2}$$$$^{+}$$ ions

Narumi, Kazumasa; Takahashi, Yasuyuki*; Chiba, Atsuya; Yamada, Keisuke; Matoba, Shiro; Saito, Yuichi; Ishikawa, Norito; Sugai, Hiroyuki*; Maeda, Yoshihito

no journal, , 

no abstracts in English

Oral presentation

Measurement of the absolute detection efficiency of a high sensitivity tapered microchannel plate

Matoba, Shiro; Shiromaru, Haruo*; Koizumi, Tetsuo*; Takahashi, Karin*; Moriya, Sosuke*; Ishikawa, Manabu*

no journal, , 

no abstracts in English

Oral presentation

Ion detection efficiency of a tapered microchannnel plate

Matoba, Shiro; Narumi, Kazumasa; Saito, Yuichi; Chiba, Atsuya; Yamada, Keisuke; Kamiya, Tomihiro; Koizumi, Tetsuo*; Takahashi, Karin*; Ishikawa, Manabu*; Moriya, Sosuke*; et al.

no journal, , 

no abstracts in English

Oral presentation

Wake effects on fast molecular transmission through a nanocapillary

Tsuchida, Hidetsugu*; Nakajima, Kaoru*; Yokoe, Junya*; Sugiyama, Motohiko*; Ota, Yushi*; Majima, Takuya*; Shibata, Hiromi*; Tomita, Shigeo*; Sasa, Kimikazu*; Hirata, Koichi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Measurements of absolute detection efficiency of a high-sensitivity microchannel plate for rare gas ions

Ishikawa, Manabu*; Koizumi, Tetsuo*; Takahashi, Karin*; Shiromaru, Haruo*; Matoba, Shiro

no journal, , 

no abstracts in English

Oral presentation

Secondary-ion mass spectrometry with transmission of swift cluster ions through foil targets

Hirata, Koichi*; Saito, Yuichi; Narumi, Kazumasa; Chiba, Atsuya; Yamada, Keisuke; Matoba, Shiro

no journal, , 

no abstracts in English

Oral presentation

Vicinage effect on secondary-electron emissions from amorphous carbon foils bombarded with 62.5-250-keV/u H$$_{2}$$$$^{+}$$ and C$$_{2}$$$$^{+}$$ ions

Narumi, Kazumasa; Chiba, Atsuya; Yamada, Keisuke; Matoba, Shiro; Saito, Yuichi

no journal, , 

no abstracts in English

Oral presentation

Spatial control of fast molecular/cluster-ion beams with capillaries

Tsuchida, Hidetsugu*; Majima, Takuya*; Tomita, Shigeo*; Sasa, Kimikazu*; Hirata, Koichi*; Shibata, Hiromi*; Saito, Yuichi; Narumi, Kazumasa; Chiba, Atsuya; Yamada, Keisuke; et al.

no journal, , 

no abstracts in English

Oral presentation

Development of accelerator- and beam-technology for electrostatic accelerators

Yamada, Keisuke; Saito, Yuichi; Ishii, Yasuyuki; Matoba, Shiro; Chiba, Atsuya; Yokoyama, Akihito; Usui, Aya; Sato, Takahiro; Okubo, Takeru; Uno, Sadanori

no journal, , 

no abstracts in English

Oral presentation

Transmission properties of a 4-MeV C$$^+$$ ion beam entering a channel between the surfaces of convex and concave cylindrical glass lens

Motohashi, Kenji*; Suzuki, Yuki*; Saito, Yuichi; Miyawaki, Nobumasa; Matoba, Shiro; Kamiya, Tomihiro

no journal, , 

no abstracts in English

Oral presentation

Cluster-size dependence of secondary-electron yields from carbon foils bombarded with 100's keV/u cluster ions

Narumi, Kazumasa; Chiba, Atsuya; Yamada, Keisuke; Matoba, Shiro; Saito, Yuichi

no journal, , 

no abstracts in English

Oral presentation

Measurement of absolute detection efficiency of a tapered microchannel plate

Matoba, Shiro; Ishikawa, Manabu*; Takahashi, Karin*; Koizumi, Tetsuo*; Shiromaru, Haruo*

no journal, , 

no abstracts in English

28 (Records 1-20 displayed on this page)