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Measurement of the Bi209(n,4n)Bi206 and Tm169(n,3n)Tm167 cross sections between 23.5 and 30.5 MeV relevant to reaction-in-flight neutron studies at the National Ignition Facility

Journal Article · · Physical Review C

At the National Ignition Facility, experiments are being performed to measure charged-particle stopping powers in the previously unexplored warm dense plasma regime. These measurements are done using reaction-in-flight (RIF) neutrons from an inertial confinement fusion system. RIF neutrons are produced with a continuum of energies up to 30 MeV. By making activation measurements utilizing threshold reactions for neutrons in the energy range of 15 < E n < 30 MeV , the number of RIF neutrons can be determined and from this the stopping power of the deuterium and tritium ions that produced the RIF neutrons can be inferred. Currently, the 169 Tm ( n , 3 n ) 167 Tm reaction has been used. However, in an effort to provide a secondary complimentary measurement, efforts are underway to make use of the 209 Bi ( n , 4 n ) 206 Bi reaction, with a threshold of 22.5 MeV. The cross sections were measured at the 10 MV tandem Van De Graaff accelerator at the Triangle Universities Nuclear Laboratory with quasimonoenergetic neutrons between 23.5 and 30.5 MeV, where few previous measurements have been made. Cross-section data are compared to calculations and other available measurements.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1409948
Alternate ID(s):
OSTI ID: 1416291
OSTI ID: 1377098
Report Number(s):
LLNL-JRNL--741346
Journal Information:
Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 96; ISSN PRVCAN; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (12)

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journal October 2013
Au, Bi, Co and Nb cross-section measured by quasimonoenergetic neutrons from p + 7Li reaction in the energy range of 18–36 MeV journal September 2016
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Measurement of the Tm 169 ( n , 3 n ) Tm 167 cross section and the associated branching ratios in the decay of Tm 167 journal January 2016
High-Adiabat High-Foot Inertial Confinement Fusion Implosion Experiments on the National Ignition Facility journal February 2014
Measurement of activation cross-sections for high-energy neutron-induced reactions of Bi and Pb journal August 2015
Measurements of Neutron Spallation Cross Sections of 12 C and 209 Bi in the 20- to 150-MeV Energy Range journal July 1998
Reaction-in-Flight Neutrons as a Test of Stopping Power in Degenerate Plasmas text January 2014

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