Determination of the Secondary Neutron Flux at the Massive Natural Uranium Spallation Target

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F17%3A00506278" target="_blank" >RIV/61389005:_____/17:00506278 - isvavai.cz</a>

Alternative codes found

RIV/00216305:26220/17:PU125459

Result on the web

<a href="http://dx.doi.org/10.1016/j.phpro.2017.09.021" target="_blank" >http://dx.doi.org/10.1016/j.phpro.2017.09.021</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.phpro.2017.09.021" target="_blank" >10.1016/j.phpro.2017.09.021</a>

Result language

angličtina

Original language name

Determination of the Secondary Neutron Flux at the Massive Natural Uranium Spallation Target

Original language description

The flux of secondary neutrons generated in collisions of the 660 MeV proton beam with the massive natural uranium spallation target was investigated using a set of monoisotopic threshold activation detectors. Sandwiches made of thin high-purity Al, Co, Au, and Bi metal foils were installed in different positions across the whole spallation target. The gamma-ray activity of products of (n,xn) and other studied reactions was measured offline with germanium semiconductor detectors. Reaction yields of radionuclides with half-life exceeding 100 min and with effective neutron energy thresholds between 3.6 MeV and 186 MeV provided us with information about the spectrum of spallation neutrons in this energy region and beyond. The experimental neutron flux was determined using the measured reaction yields and cross-sections calculated with the TALYS 1.8 nuclear reaction program and INCL4-ABLA event generator of MCNP6. Neutron spectra in the region of activation sandwiches were also modeled with the radiation transport code MCNPX 2.7. Neutron flux based on excitation functions from TALYS provides a reasonable description of the neutron spectrum inside the spallation target and is in good agreement with Monte-Carlo predictions. The experimental flux that uses INCL4 cross-sections rather underestimates the modeled spectrum in the whole region of interest, but the agreement within few standard deviations was reached as well. The paper summarizes basic principles of the method for determining the spectrum of high-energy neutrons without employing the spectral adjustment routines and points out to the need for model improvements and precise cross-section measurements.

Czech name

—

Czech description

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Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10304 - Nuclear physics

Project

<a href="/en/project/LG14004" target="_blank" >LG14004: Cooperation of Czech Republic with JINR Dubna in the theoretical and nuclear physics and application of nuclear methods in other fields</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Physics Procedia

ISBN

—

ISSN

1875-3892

e-ISSN

—

Number of pages

10

Pages from-to

69-78

Publisher name

Elsevier

Place of publication

Amsterdam

Event location

Los Alamos

Event date

Oct 30, 2016

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

000454340400010