Abstract
We have developed a low threshold detector consisting of Bragg curve counter (BCC), two siliconsurface barrier detectors (SSDs) and BGO scintillator to obtain experimental double-differential cross section (DDX) data for low energy proton production. Since the BCC offers advantage of self particle identification capability and a few μm-thick entrance window, protons produced by nuclear reactions down to 1 MeV have been identified. The capability of the detector is demonstrated in measurements using 70-MeV protons. Measured spectra are compared with calculation results of intra-nuclear cascade (INC) plus evaporation models and nuclear data library.
Highlights
The double-differential cross section (DDX) data of particle production from an energetic proton-nucleus reaction are required to estimate spatial distributions of energy deposition and radiation damage in devices used for accelerator driven system and particle radiation therapy
To describe the secondary particle emission, twostage model, which consists of the intra-nuclear cascade (INC) model[2] and the generalized evaporation model (GEM)[3], is generally used for the proton-nucleus reactions up to several hundreds of MeV
We develop a low threshold detector consisting of Bragg curve counter (BCC)[6, 7], two SSDs, and BGO scintillator to obtain the systematic DDX data covering low energy range
Summary
The double-differential cross section (DDX) data of particle production from an energetic proton-nucleus reaction are required to estimate spatial distributions of energy deposition and radiation damage in devices used for accelerator driven system and particle radiation therapy. The GEM describes low energy particle emission from an excited nucleus with considering Coulomb barrier after INC stage. A theoretical study on low energy proton emission has been starting to improve the GEM, few experimental DDX data are available for validating it. The measurement of DDX has been performed with ∆E − E method for particle identification using two silicon-surface barrier detectors (SSDs) In this method, the threshold energy with particle identification is limited by the thickness of the transmission SSD. We develop a low threshold detector consisting of Bragg curve counter (BCC)[6, 7], two SSDs, and BGO scintillator to obtain the systematic DDX data covering low energy range. The BCC has advantages of the thin entrance window and self particle identification capability in low energy threshold measurements
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