Analysis of a neutronic experiment on a simulated mercury spoliation neutron target assembly bombarded by giga-electron-volt protons

Fujio Maekawa, Shin Ichiro Meigo, Yoshimi Kasugai, Hiroshi Takada, Takashi Ino, Setsuo Sato, Eric Jerde, David Glasgow, Koji Niita, Hiroshi Nakashima, Yukio Oyama, Yujiro Ikeda, Noboru Watanabe, Jerome Hastings

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

A neutronic benchmark experiment on a simulated spoliation neutron target assembly was conducted by using the Alternating Gradient Synchrotron at Brookhaven National Laboratory and was analyzed to investigate the prediction capability of Monte Carlo simulation codes used in neutronic designs of spoliation neutron sources. The target assembly consisting of a mercury target, a light water moderator, and a lead reflector was bombarded by 1.94-, 12-, and 24-GeV protons, and the fast neutron flux distributions around the target and the spectra of thermal neutrons leaking from the moderator were measured in the experiment. In this study, the Monte Carlo particle transport simulation codes NMTC/ JAM, MCNPX, and MCNP-4A with associated cross-section data in JENDL and LA-150 were verified based on benchmark analysis of the experiment. As a result, all the calculations predicted the measured quantities adequately; calculated integral fluxes of fast and thermal neutrons agreed approximately within ±40% with the experiments although the overall energy range encompassed more than 12 orders of magnitude. Accordingly, it was concluded that these simulation codes and cross-section data were adequate for neutronics designs of spoliation neutron sources.

Original languageEnglish
Pages (from-to)99-108
Number of pages10
JournalNuclear Science and Engineering
Volume150
Issue number1
DOIs
StatePublished - May 2005

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