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Uozumi, Yusuke*; Shigyo, Nobuhiro*; Kajimoto, Tsuyoshi*; Moriguchi, Daisuke*; Ueyama, Masahiko*; Yoshioka, Masakatsu*; Satoh, Daiki; Sanami, Toshiya*; Koba, Yusuke*; Takada, Masashi*; et al.
HIMAC-136, p.248 - 249, 2011/11
no abstracts in English
Satoh, Daiki; Moriguchi, Daisuke*; Kajimoto, Tsuyoshi*; Koba, Yusuke*; Nakamura, Yasuhiro*; Shigyo, Nobuhiro*; Ueyama, Masahiko*; Uozumi, Yusuke*; Yoshioka, Masakatsu*; Matsufuji, Naruhiro*; et al.
Journal of the Korean Physical Society, 59(2), p.1741 - 1744, 2011/08
Times Cited Count：3 Percentile：26.89(Physics, Multidisciplinary)The data of neutron production from heavy-ion interactions are of great importance for the dose assessment in heavy-ion therapy. We have already evaluated the data of neutron production for thick targets, in which the incident heavy ions completely stop, by the measurements and the reevaluation of the existing data reported by Kurosawa et al. As a next step of the research, we plan to evaluate the neutron-production cross-section data for thin targets. These data are useful to understand the mechanism of heavy-ion interaction, and improve the reaction model in particle transport codes. The previously reported cross-section data by Iwata et al. were revised by using a new set of neutron-detection efficiency values calculated with SCINFUL-QMD code. While the original data gave the larger values than the predictions of particle transport codes above 200 MeV due to the underestimation of the efficiencies, it was improved by this revision. In addition, we have started the new cross-section measurements at HIMAC. All the data of neutron-production cross sections were compared with the predictions of particle transport codes.
Satoh, Daiki; Moriguchi, Daisuke*; Kajimoto, Tsuyoshi*; Uehara, Haruhiko*; Shigyo, Nobuhiro*; Ueyama, Masahiko*; Yoshioka, Masakatsu*; Uozumi, Yusuke*; Sanami, Toshiya*; Koba, Yusuke*; et al.
Nuclear Instruments and Methods in Physics Research A, 644(1), p.59 - 67, 2011/07
Times Cited Count：19 Percentile：78.96(Instruments & Instrumentation)Neutron-production double-differential cross sections on carbon-carbon and oxygen-carbon reactions with incident heavy-ion energy of 290 MeV/nucleon were measured by time-of-flight method using liquid organic scintillators. By use of a detection system specialized for low-energy neutrons, the cross sections were obtained in a wide energy region from several hundred MeV down to 0.6 MeV for the oxygen-ion incidences. The experimental data were compared with the calculation results using the Monte-Carlo simulation code, PHITS. The PHITS results gave an overall agreement with the measured data within a factor of two.
Uozumi, Yusuke*; Iwamoto, Hiroki*; Koba, Yusuke*; Matsufuji, Naruhiro*; Sanami, Toshiya*; Satoh, Daiki; Shigyo, Nobuhiro*; Takada, Masashi*; Ueyama, Masahiko*; Yoshioka, Masakatsu*; et al.
Progress in Nuclear Science and Technology (Internet), 1, p.114 - 117, 2011/02
It is important to assess and suppress the potential for second cancer induction by secondary neutrons produced in primary heavy-ion fragmentation in patient body. Since it is very difficult to measure high-energy neutron doses in mixed radiation fields, a Monte-Carlo simulation approach has attracted much attention as an alternative for neutron dose estimation. It is notoriously hard to reproduce the spectral cross sections of neutrons from high-energy heavy-ion collisions. We, therefore, have planned experiments to measure energy-angle double-differential cross sections of nuclear reactions.
Shigyo, Nobuhiro*; Uozumi, Yusuke*; Kajimoto, Tsuyoshi*; Moriguchi, Daisuke*; Ueyama, Masahiko*; Yoshioka, Masakatsu*; Koba, Yusuke*; Nakamura, Yasuhiro*; Satoh, Daiki; Sanami, Toshiya*; et al.
no journal, ,
Radiation dose by neutrons produced by proton and heavy ion induced nuclear reactions around tumor is essential for dose assessment in proton and heavy ion radiotherapies. Double differential cross section (DDX) of neutron production is one of important physical quantities for dose estimation by radiation transport codes. Some experimental data of neutron production DDXs have been reported above 5 MeV of neutron energy for heavy ion incident reactions. Neutron production DDX for carbon ion incidence on carbon target was measured at the Heavy Ion Medical Accelerator in Chiba (HIMAC) including low neutron energy region for validation of radiation transport codes. Incident carbon energy was 290 MeV/u. NE213 liquid organic scintillators were deployed as neutron detectors and placed at 15
, 30 45, 60, 75 and 90. Neutron energies were determined by the time-of-flight methods. Neutron detection efficiency was calculated by the SCINFUL-QMD code. The obtained minimum neutron energy was about 2.8 MeV. The experimental data of neutron production DDX was compared with that by one of radiation transport codes, PHITS.
Satoh, Daiki; Shigyo, Nobuhiro*; Uozumi, Yusuke*; Moriguchi, Daisuke*; Kajimoto, Tsuyoshi*; Yoshioka, Masakatsu*; Ueyama, Masahiko*; Sanami, Toshiya*; Koba, Yusuke*; Matsufuji, Naruhiro*; et al.
no journal, ,
Neutron-production double-differential cross sections from heavy-ion interactions have been measured at Heavy-Ion Medical Accelerator in Chiba (HIMAC) of National Institute of Radiological Sciences (NIRS), Japan. 290-MeV/u O ions were bombarded upon a carbon target. The outgoing neutrons from the target were measured by a detection system that consist of two sizes of liquid organic scintillators with Time-of-Flight (TOF) technique in order to obtain a wide range of neutron spectrum from sub MeV to several hundred MeV. We have successfully measured the cross sections with a good precision.
Satoh, Daiki; Moriguchi, Daisuke*; Nakamura, Yasuhiro*; Kajimoto, Tsuyoshi*; Ueyama, Masahiko*; Yoshioka, Masakatsu*; Koba, Yusuke*; Shigyo, Nobuhiro*; Uozumi, Yusuke*; Matsufuji, Naruhiro*; et al.
no journal, ,
Neutron production double differential cross sections have been measured at HIMAC in National Institute of Radiological Sciences. The cross sections were obtained in the energy region from a few MeV to several hundred MeV. In addition, we got the systematic cross section data by revising the detection efficiencies in the existing data. All the data were compared with the predictions of Monte Carlo simulation codes. While the codes show a good agreement in the backward angular region, they can not reproduce the peak structure observed in the forward angular region. This indicates that the nucleus-nucleus reaction model in the simulation codes must be revised.
