JAEA-Conf 2011-002 - 日本原子力研究開発機構

4. Off line data analysis
Double differential cross sections were determined through off-line analysis. The recorded pulse heights
of signals were converted into particle energy using the Bethe-Bloch equation [4] and the Birks equation [1]
taking into account the nonlinearity between light output and energy deposition. Particle identification was
carried out by using PI technique [5]. The particle identification quantity, PI, is given by,
b
total
PI E ( E E)
, (2)
total
Where Etotal is the total energy deposited in the spectrometer, the E is the amount of energy deposited in the
transmission detector and b is the parameter whose value was employed to be 1.73 to obtain best separation.
5. Conclusion
In order to develop a new detector system, we have investigated the light output response and peak
efficiencies of BGO crystals with respect to Proton and Alpha particles. The BGO crystal has good properties
for the needs of our measurements. The experimental results showed a good agreement with the calculated
curves by Birks equation.
References:
JAEA-Conf 2011-002
[1] J.B. Birks. “The Theory and Practice of Scintillation Counting” (Macmillan, New York) 1994.
[2] EA Bakkum, Van Engelen, R.Kamermans et al., Nucl. Instr. & Meth. 225, 46 (1984). (330-334)
[3] T. Kin et al., Physical Revew C, Vol.72, 014606 1-9 (2005).
[4] N.Tsoulfanidis, Measurement and Detection of Radiation, Second Edition, Taylor & Francis, p. 124, 1995.
[5] Makino, M., Eisburg, R., Inghum, D. and Waddell, C.: “A Method for Reducing the Effect of Nuclear
Reaction in Stopping Detectors”, Nuclear Instruments and Methods, Vol. 81, pp. 125-131, 1970.
b