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Journal Articles

Measurement of radioactive fragment production excitation functions of lead by 400 MeV/u carbon ions

Ogawa, Tatsuhiko; Morev, M. N.*; Kosako, Toshiso*

Transactions of the American Nuclear Society, 109(2, Part2), p.1253 - 1255, 2013/11

Depth distributions of radioactive fragments in a thick lead target exposed to 400 MeV/u carbon ions were measured to obtain isotopic production cross-sections of $$^{Nat}$$Pb($$^{12}$$C,x)X (X=$$^{46}$$Sc, $$^{48}$$V, $$^{54}$$Mn, $$^{56}$$Co, $$^{58}$$Co, $$^{59}$$Fe, $$^{75}$$Se, $$^{83}$$Rb, $$^{85}$$Sr, $$^{113}$$Sn, $$^{121}$$Te, $$^{127}$$Xe, $$^{133}$$Ba, $$^{139}$$Ce, $$^{143}$$Pm, $$^{144}$$Pm, $$^{146}$$Gd, $$^{148}$$Eu, $$^{149}$$Gd, $$^{172}$$Hf and $$^{175}$$Hf) reactions as excitation functions. The obtained fragment distributions were converted to excitation functions of fragmentation cross-sections by the modified stacked-foil method. This conversion procedure was validated by comparing the obtained data with the available thin target experimental data. The obtained cross-sections were in good agreement with the previously published results. Comparison of the obtained cross-sections and the simulation by PHITS showed that PHITS underestimates fragments lighter than 90 amu by factor of about 10 whereas the fragments heavier than 110 amu were predicted within a factor of 3. Energy and mass dependences of the obtained cross-sections give insight into the reaction mechanism and will be useful for radiation transport code benchmarking. Furthermore, this study clarified that excitation functions of fragmentation reactions induced by heavy ions can be obtained by applying the method adopted in this study.

Journal Articles

Analysis of fragmentation excitation functions of lead by carbon ions up to 400 MeV/u

Ogawa, Tatsuhiko; Morev, M. N.*; Sato, Tatsuhiko; Hashimoto, Shintaro

Nuclear Instruments and Methods in Physics Research B, 300, p.35 - 45, 2013/04

 Times Cited Count:8 Percentile:59.34(Instruments & Instrumentation)

Fragmentation reaction cross sections of lead bombarded by carbon ions below 400 MeV/u were measured and compared with those simulated with the Monte Carlo radiation transport code PHITS to pinpoint the problems of simulation based on the quantum molecular dynamics model and statistical decay model. Cross sections for 32 fragments from 24 to 85 amu and those from 121 to 175 amu were measured within a reasonable uncertainty. Comparison shows that production cross sections for fragments from 20 to 60 amu and those from 110 to 130 amu are underestimated by one order of magnitude. Further simulation shows that the production of each group of fragments in the simulation is attributed to evaporation of fission fragments and to evaporation of highly excited prefragments, respectively. The observed underestimation indicates the presence of nuclear reaction mechanisms (not considered in the current simulation), such as multi-fragmentation.

Oral presentation

Neutron dose measurement using convex hull data treatment

Hashimoto, Makoto; Morev, M. N.*; Iimoto, Takeshi*; Kosako, Toshiso*

no journal, , 

A neutron dose measurement method with multiple neutron detectors is developed. A vector space composed with ratio of multiple neutron detectors' output derive the neutron dose in particular extent. It was applied to special proportional counter or personal dosimeter and confirmed the vallidity of this method. It improved the credibility of neutron dose measurement from the conventional dose measurement in spite of using conventional detectors.

Oral presentation

Characteristics of convex hull data treatment dosimetry using multiple detectors

Hashimoto, Makoto; Morev, M. N.*; Iimoto, Takeshi*; Kosako, Toshiso*

no journal, , 

Convex hull data treatment dosimetry using multiple dosimeters is studied. It makes available to make reliable dosimetry with feedback of data about the radiation field derived from the relationship between multiple detector outputs. It holds that the combination of even simple detectors can evaluate the neutron personal dose equivalent or ambient dose equivalent in sufficient accuracy. The relation between the combination of detectors and the capability of dose evaluation is also discussed.

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