Direct measurement of nanoscale lithium diffusion in solid battery materials using radioactive tracer of Li

Ishiyama, Hironobu*; Jeong, S.-C.*; Watanabe, Yutaka*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Jung, H. S.*; Miyatake, Hiroari*; Oyaizu, Mitsuhiro*; Osa, Akihiko; Otokawa, Yoshinori; et al.

Nuclear Instruments and Methods in Physics Research B, 376, p.379 - 381, 2016/06

https://doi.org/10.1016/j.nimb.2015.12.036

GEM-MSTPC; An Active-target type detector in low-pressure He/CO mixed gas

Ishiyama, Hironobu*; Yamaguchi, Kanako*; Mizoi, Yutaka*; Watanabe, Yutaka*; Das, S. K.*; Hashimoto, Takashi*; Miyatake, Hiroari*; Hirayama, Yoshikazu*; Imai, Nobuaki*; Oyaizu, Mitsuhiro*; et al.

Journal of Instrumentation (Internet), 7(3), p.C03036_1 - C03036_14, 2012/03

https://doi.org/10.1088/1748-0221/7/03/C03036

We developed an active-target type gas counter operating with low He/CO (10%) detector gas for application in studying low-energy nuclear reactions using radioactive beams. A 400-m-thick gas electron multiplier (THGEM) was used as the proportional counter for high injection rate capability. We examined the gas gain stability and the influence of ion feedback on particle tracks at high beam injection rates of up to 10 particles per second (pps) using a low-energy C beam. From the result of this examination, we found that the THGEM was found to be applicable for our active target at high injection rates of up to 10 pps.

KEKCB electron cyclotron resonance charge breeder at TRIAC

Imai, Nobuaki*; Jeong, S.-C.*; Oyaizu, Mitsuhiro*; Arai, Shigeaki*; Fuchi, Yoshihide*; Hirayama, Yoshikazu*; Ishiyama, Hironobu*; Miyatake, Hiroari; Tanaka, Masahiko*; Okada, Masashi*; et al.

Review of Scientific Instruments, 79(2), p.02A906_1 - 02A906_3, 2008/02

https://doi.org/10.1063/1.2828070

KEKCB is an 18 GHz Electron Cyclotron Resonance (ECR) ion source and is a charge breeder device for converting mass-separated 1 radioactive ions to multi-ionized ones by utilizing an axial injection technique to the ECR plasma. It is a part of the Tokai Radioactive Ion Accelerator Complex (TRIAC) facility. Based on the developments so far, converting efficiencies for metal elements, such as barium and indium, and for gaseous elements, such as krypton and xenon, are improved to be 7 and 2 , respectively. And it is confirmed that the efficiency is nearly the constant for short-lived (t 1 sec) isotopes. Background ions mixed in the output beams are supressed to be 600 pps from 10 pps by applying all aluminum electrodes and high pressure pure-water cleanings.

Charge-state breeding of neutron-rich medium-heavy nuclides using KEK charge breeder

Oyaizu, Mitsuhiro*; Ishiyama, Hironobu*; Imai, Nobuaki*; Kawakami, Hirokane*; Tanaka, Masahiko*; Jeong, S.-C.*; Hirayama, Yoshikazu*; Fuchi, Yoshihide*; Miyatake, Hiroari; Watanabe, Yutaka*; et al.

no journal, , 

Experimental results on the charge breeding efficiencies for medium-hevy elements, such as indium, barium, Zenon, etc, including radioactive isotopes were reported.

The RI beams from the Tokai Radioactive Ion Accelerator Complex (TRIAC)

Osa, Akihiko; Abe, Shinichi; Asozu, Takuhiro; Hanashima, Susumu; Ishii, Tetsuro; Ishizaki, Nobuhiro; Kabumoto, Hiroshi; Kutsukake, Kenichi; Matsuda, Makoto; Nakamura, Masahiko; et al.

no journal, , 

At JAEA-tandem accelerator facility, we can produce radioactive nuclei by means of proton induced uranium fission, heavy ion fusion or transfer reaction. Since TRIAC was opened for use in 2005, we have provided RNBs of fission products and Li. For the production of Li, we chose C (Li, Li) neutron transfer reaction by Li primary beam and a 99% enriched C sintered disk target. The release time of Li ions from the C sintered target/ion source system was measured to be 3.2 s. We are developing the RNB of Li (T=178 ms) but the long release time caused a significant loss of the beam intensity. A boron nitride target which has fast release of Li is developed for Li beam with intensity of 10 pps after separation by JAEA-ISOL.