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Journal Articles

Influence of linear energy transfer on the scintillation decay behavior in a lithium glass scintillator

Koshimizu, Masanori*; Iwamatsu, Kazuhiro*; Taguchi, Mitsumasa; Kurashima, Satoshi; Kimura, Atsushi; Yanagida, Takayuki*; Fujimoto, Yutaka*; Watanabe, Kenichi*; Asai, Keisuke*

Journal of Luminescence, 169(Part B), p.678 - 681, 2016/01

We analyzed the effects of linear energy transfer (LET) on the scintillation properties of a Li glass scintillator, GS20. The scintillation time profiles were measured by using pulsed ion beams having different LETs. The rise in the scintillation time profiles was faster for higher LET, whereas the decay part was not significantly different for largely different LETs. The LET effects in the rise was ascribed to the effects of excited states interaction during the energy transfer process from the host glass to the luminescent centers, Ce$$^{3+}$$ ions. Supposing that the light yield decreases with LET, the fast rise at high LET was explained in terms of the competition between the energy transfer and the quenching due to the excited states interaction.

Journal Articles

Linear energy transfer effects on time profiles of scintillation of Ce-doped LiCaAlF$$_{6}$$ crystals

Yanagida, Takayuki*; Koshimizu, Masanori*; Kurashima, Satoshi; Iwamatsu, Kazuhiro*; Kimura, Atsushi; Taguchi, Mitsumasa; Fujimoto, Yutaka*; Asai, Keisuke*

Nuclear Instruments and Methods in Physics Research B, 365(Part B), p.529 - 532, 2015/12

 Times Cited Count:9 Percentile:69.75(Instruments & Instrumentation)

We measured temporal profiles of scintillation of Ce-doped LiCaAlF$$_{6}$$ scintillator crystals at different linear energy transfers (LETs). Based on the comparison of the high-LET temporal profiles with those at low LET, we found that a fast component was observed only at low LET. The disappearance of the fast component at high LET is tentatively ascribed to quenching of excited states at defects owing to the interaction between excited states via Auger process. In addition, the rise and the initial decay behavior was dependent on the LET. This LET-dependent behavior is explained by a seeming acceleration process and a slowing down process in energy transfer at high LET. The LET-dependent temporal profiles provide a basis of discrimination technique of $$gamma$$-ray and neutron detection events using these scintillators based on the nuclear reaction, $$^{6}$$Li(n,$$alpha$$)t.

Journal Articles

The Nucleosynthetic signatures of the first star survivors among hyper metal-poor stars with [Fe/H] $$<$$ -4.5

Suda, Takuma*; Komiya, Yutaka*; Nishimura, Takanori*; Iwamoto, Nobuyuki; Aikawa, Masayuki*; Fujimoto, Masayuki*

AIP Conference Proceedings 1016, p.43 - 48, 2008/05

The first stars in our Universe are the useful probes for the star formation history in the very early Universe. In order to identify these survivors, we should consider the effect of changing surface abundances during their long lives. The surface abundances are modified by the accretion of gas from the interstellar matter and/or the binary mass transfer. The latter can affect the abundance pattern through the evolution of primary star that experienced the internal mixing and dredge-up during thermally pulsating AGB. The top three of the iron deficient stars are reported as the candidates of the first stars. These stars have [Fe/H] $$<$$ -4.5 and share the common feature of large enhancement of C. We argue that these abundance patterns are testified to the evolutionary characteristics of the first stars with low- and intermediate-mass by trying to constrain the mass of primary under the assumption that they were the survivors of secondary stars in the binary system when they were born.

Journal Articles

Magic numbers in exotic nuclei and spin-isospin properties of $$NN$$ interaction

Otsuka, Takaharu*; Fujimoto, Rintaro*; Utsuno, Yutaka; Brown, B. A.*; Homma, Michio*; Mizusaki, Takahiro*

Physical Review Letters, 87(8), p.082502_1 - 082502_4, 2001/08

A2001-0048.pdf:0.15MB

 Times Cited Count:605 Percentile:99.48(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Application of a compact reactor to a submersible research vessel

Kusunoki, Tsuyoshi; Fujimoto, Hiromi*; Nagata, Yutaka*; Takahashi, Teruo*; Ishida, Toshihisa

Kaiyo Chosa Gijutsu, 12(2), p.1 - 10, 2000/09

no abstracts in English

Oral presentation

LET effects on the scintillation properties of a Ce-doped Ca$$_{3}$$B$$_{2}$$O$$_{6}$$6 scintillator

Koshimizu, Masanori*; Fujimoto, Yutaka*; Yanagida, Takayuki*; Iwamatsu, Kazuhiro; Kimura, Atsushi; Kurashima, Satoshi; Taguchi, Mitsumasa; Asai, Keisuke*

no journal, , 

no abstracts in English

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