ANALYSIS OF PARTICLE DISTRIBUTION IN A DOUBLE LAYER BEAM SHAPING ASSEMBLY RESULTED FROM 30 MEV-PROTON REACTIONS WITH BERYLLIUM TARGET USING THE PHITS PROGRAM

Bilalodin Bilalodin; Gede Bayu Suparta; Arief Hermanto; Dwi Satya Palupi; Yohannes Sardjono; Rasito Rasito

doi:10.11113/jt.v82.13162

Authors

Bilalodin Bilalodin Department of Physics, Faculty of Mathematics and Natural Science, Gajah Mada University, Indonesia Department of Physics, Faculty of Mathematics and Natural Science, Jenderal Soedirman University, Indonesia
Gede Bayu Suparta Department of Physics, Faculty of Mathematics and Natural Science, Gajah Mada University, Indonesia
Arief Hermanto Department of Physics, Faculty of Mathematics and Natural Science, Gajah Mada University, Indonesia
Dwi Satya Palupi Department of Physics, Faculty of Mathematics and Natural Science, Gajah Mada University, Indonesia
Yohannes Sardjono Centre for Accelerator Science and Technology, National Nuclear Energy Agency, Indonesia
Rasito Rasito Center for Applied Nuclear Science and Nuclear Agency, Bandung, Indonesia

DOI:

https://doi.org/10.11113/jt.v82.13162

Keywords:

Particle distribution, 9Be(p, n)9Be reaction, double layer BSA, spectrum of neutron beam, PHITS program

Abstract

An analysis on the distribution of particle flux emanating from reactions of 30 MeV-proton with beryllium target in a double layer beam shaping assembly (BSA) has been carried out using the PHITS program.Â It studies important parameters relating to the distribution of proton, neutron, and gamma. It is revealed that reactions of proton and beryllium in double layer BSA produce fast neutrons and other protons, resulting from certain reactions, and recoil protons from the interactions of fast neutrons and hydrogen atoms. Fast neutrons are distributed around beryllium target, moderator, reflector, and collimator. They are moderated by Al and LiF material. Epithermal neutrons spread along the moderator, with a distribution that is tapering down as it approaches the end of the collimator (aperture). During its travel along the moderator, an epithermal neutron decreases in energy to become a thermal neutron. The spectrum of neutron beam produced by the double layer BSA is wide, which indicates that the neutron beam exiting the aperture consists of three kinds of neutrons, dominated by epithermal neutronswith energy range 1 eV â€“ 10 keV.Â Â

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