학술논문
Radioactivity produced by a repetitive laser-driven proton beam using a shot-to-shot proton spectral measurement and a direct activation method.
Document Type
Article
Author
Ogura, Koichi; Shizuma, Toshiyuki; Hayakawa, Takehito; Yogo, Akifumi; Nishiuchi, Mamiko; Orimo, Satoshi; Sagisaka, Akito; Pirozhkov, Alexander; Mori, Michiaki; Kiriyama, Hiromitsu; Kanazawa, Shuhei; Kondo, Shuji; Nakai, Yoshiki; Shimomura, Takuya; Tanoue, Manabu; Sasao, Hajime; Wakai, Daisuke; Sasao, Fumitaka; Okada, Hajime; Kimura, Toyoaki
Source
Subject
*RADIOACTIVITY
*LASER beams
*PROTON beams
*NUCLEAR reactions
*GAMMA rays
*NUCLEAR cross sections
*SPECTRAL energy distribution
*DETECTORS
*SIGNAL processing
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Language
ISSN
0094-243X
Abstract
A proton beam driven by a repetitive high-intensity-laser is utilized to induce a 7Li(p,n) 7Be nuclear reaction. The total activity of 7Be are evaluated by two different methods. The activity obtained measuring the decay gamma-rays after 1912 shots at 1 Hz is 1.7 ± 0.2 Bq. This is in good agreement with 1.6 ± 0.2 Bq evaluated from the proton energy distribution measured using a time-offlight detector and the nuclear reaction cross-sections. We conclude that the production of activity can be monitored in real time using the time-of-flight-detector placed inside a diverging proton beam coupled with a high-speed signal processing system. [ABSTRACT FROM AUTHOR]