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Title: Secondary neutron-production cross sections from heavy-ion interactions in composite targets

Abstract

Secondary neutron-production cross sections have been measured from interactions of 290 MeV/nucleon C and 600 MeV/nucleon Ne in a target composed of simulated Martian regolith and polyethylene, and from 400 MeV/nucleon Ne interactions in wall material from the International Space Station. The data were measured between 5 deg. and 80 deg. in the laboratory. We report the double-differential cross sections, angular distributions, and total neutron-production cross sections from all three systems. The spectra from all three systems exhibit behavior previously reported in other heavy-ion neutron-production experiments, namely, a peak at forward angles near the energy corresponding to the beam velocity, with the remaining spectra generated by pre-equilibrium and equilibrium processes. The double-differential cross sections are fitted with a moving-source parametrization. Also reported are the data without corrections for neutron flux attenuation in the target and other intervening materials and for neutron production in nontarget materials near the target position. These uncorrected spectra are compared with SHIELD-HIT and PHITS transport model calculations. The transport model calculations reproduce the spectral shapes well but, on average, underestimate the magnitudes of the cross sections.

Authors:
 [1]; ;  [2]; ; ;  [3];  [4];  [5];  [6];  [7]
  1. MS 74-197, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  2. Department of Accelerator Physics and Engineering, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage, Chiba 263-8555 (Japan)
  3. Cyclotron and Radioisotope Center, Tohoku University, Aoba, Aramaki, Sendai 980-8578 (Japan)
  4. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321 (United States)
  5. Department of Physics, Rikkyo University, 3-34-1 Nishi Ikebukuro, Toshima, Tokyo 171-8501 (Japan)
  6. Department of Medical Radiation Physics, Karolinska Institutet and Stockholm University, Box 260, S-171 76 Stockholm (Sweden)
  7. Department of Neutron Research, Institute for Nuclear Research of the Russian Academy of Sciences, RU-117312 Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
20771273
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevC.73.024603; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ANGULAR DISTRIBUTION; ATTENUATION; CARBON 12 REACTIONS; CORRECTIONS; DIFFERENTIAL CROSS SECTIONS; NEON 20 REACTIONS; NEUTRON FLUX; NEUTRONS; PARTICLE PRODUCTION; POLYETHYLENES; TRANSPORT THEORY

Citation Formats

Heilbronn, L., Iwata, Y., Murakami, T., Iwase, H., Sato, H., Nakamura, T., Ronningen, R.M., Ieki, K., Gudowska, I., and Sobolevsky, N. Secondary neutron-production cross sections from heavy-ion interactions in composite targets. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.024603.
Heilbronn, L., Iwata, Y., Murakami, T., Iwase, H., Sato, H., Nakamura, T., Ronningen, R.M., Ieki, K., Gudowska, I., & Sobolevsky, N. Secondary neutron-production cross sections from heavy-ion interactions in composite targets. United States. doi:10.1103/PhysRevC.73.024603.
Heilbronn, L., Iwata, Y., Murakami, T., Iwase, H., Sato, H., Nakamura, T., Ronningen, R.M., Ieki, K., Gudowska, I., and Sobolevsky, N. Wed . "Secondary neutron-production cross sections from heavy-ion interactions in composite targets". United States. doi:10.1103/PhysRevC.73.024603.
@article{osti_20771273,
title = {Secondary neutron-production cross sections from heavy-ion interactions in composite targets},
author = {Heilbronn, L. and Iwata, Y. and Murakami, T. and Iwase, H. and Sato, H. and Nakamura, T. and Ronningen, R.M. and Ieki, K. and Gudowska, I. and Sobolevsky, N.},
abstractNote = {Secondary neutron-production cross sections have been measured from interactions of 290 MeV/nucleon C and 600 MeV/nucleon Ne in a target composed of simulated Martian regolith and polyethylene, and from 400 MeV/nucleon Ne interactions in wall material from the International Space Station. The data were measured between 5 deg. and 80 deg. in the laboratory. We report the double-differential cross sections, angular distributions, and total neutron-production cross sections from all three systems. The spectra from all three systems exhibit behavior previously reported in other heavy-ion neutron-production experiments, namely, a peak at forward angles near the energy corresponding to the beam velocity, with the remaining spectra generated by pre-equilibrium and equilibrium processes. The double-differential cross sections are fitted with a moving-source parametrization. Also reported are the data without corrections for neutron flux attenuation in the target and other intervening materials and for neutron production in nontarget materials near the target position. These uncorrected spectra are compared with SHIELD-HIT and PHITS transport model calculations. The transport model calculations reproduce the spectral shapes well but, on average, underestimate the magnitudes of the cross sections.},
doi = {10.1103/PhysRevC.73.024603},
journal = {Physical Review. C, Nuclear Physics},
number = 2,
volume = 73,
place = {United States},
year = {Wed Feb 15 00:00:00 EST 2006},
month = {Wed Feb 15 00:00:00 EST 2006}
}
  • Secondary neutron-production cross-sections have been measured from interactions of 290 MeV/nucleon C and 600 MeV/nucleon Ne in a target composed of simulated Martian regolith and polyethylene, and from 400 MeV/nucleon Ne interactions in wall material from the International Space Station. The data were measured between 5 and 80 deg in the laboratory. We report the double-differential cross sections, angular distributions, and total neutron-production cross sections from all three systems. The spectra from all three systems exhibit behavior previously reported in other heavy-ion, neutron production experiments; namely, a peak at forward angles near the energy corresponding to the beam velocity, withmore » the remaining spectra generated by pre-equilibrium and equilibrium processes. The double differential cross sections are fitted with a moving-source parameterization. Also reported are the data without corrections for neutron flux attenuation in the target and other intervening materials, and for neutron production in non-target materials near the target position. These uncorrected spectra are compared with SHIELD-HIT and PHITS transport model calculations. The transport model calculations reproduce the spectral shapes well, but, on average, underestimate the magnitudes of the cross sections.« less
  • Secondary neutron-production cross-sections have beenmeasured from interactions of 230 MeV/nucleon He, 400 MeV/nucleon N, 400MeV/nucleon Kr, 400 MeV/nucleon Xe, 500 MeV/nucleon Fe, and 600MeV/nucleon Ne interacting in a variety of elemental and compositetargets. We report the double-differential production cross sections,angular distributions, energy spectra, and total cross sections from allsystems. Neutron energies were measured using the time-of-flighttechnique, and were measured at laboratory angles between 5 deg and 80deg. The spectra exhibit behavior previously reported in otherheavy-ion-induced neutron production experiments; namely, a peak atforward angles near the energy corresponding to the beam velocity, withthe remaining spectra generated by preequilibrium and equilibriumprocesses. Themore » double-differential spectra are fitted with amoving-source parameterization. Observations on the dependence of thetotal cross sections on target and projectile mass arediscussed.« less
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  • Differential cross sections from thin targets and absolute neutron yields from stopping-length targets at angles of 7.5, 30, 60, and 150 deg for the 113-MeV proton bombardment of elemental beryllium, carbon, aluminum, iron, and depleted uranium are measured. Additional cross-section measurements are reported for oxygen, tungsten, and lead. Time-of-flight techniques are used to identify and discriminate against backgrounds and to determine the neutron energy spectrum. Comparisons of the experimental data with intranuclear-cascade evaporation model calculations with the HETC code show discrepancies as high as a factor of 7 in the differential cross sections. These discrepancies make it possible to identifymore » some of the good agreement seen in the stopping length yield comparison as fortuitous cancellation of incorrect production estimates in different energy regimes.« less
  • We have obtained charge-changing cross sections and partial cross sections for fragmentation of 1.05 GeV/nucleon Fe projectiles incident on H, C, Al, Cu, and Pb nuclei. The energy region covered by this experiment is critical for an understanding of galactic cosmic ray propagation and space radiation biophysics. Surviving primary beam particles and fragments with charges from 12 to 25 produced within a forward cone of half-angle 61 mrad were detected using a silicon detector telescope to identify their charge and the cross sections were calculated after correction of the measured yields for finite target thickness effects. The cross sections aremore » compared to model calculations and to previous measurements. Cross sections for the production of fragments with even-numbered nuclear charges are seen to be enhanced in almost all cases. {copyright} {ital 1997} {ital The American Physical Society}« less