Measurement of the {sup 241}Am(n,2n) reaction cross section from 7.6 MeV to 14.5 MeV

Journal Article · Thu May 15 04:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.77.054610· OSTI ID:21189997

Tonchev, A P; Crowell, A S; Fallin, B; Howell, C R; Hutcheson, A; Tornow, W ^[1]; Angell, C T; Boswell, M; Hammond, S; Karwowski, H J ^[2]; Kelley, J H ^[3]; Pedroni, R S ^[4]; Becker, J A; Dashdorj, D; Kenneally, J; Macri, R A; Stoyer, M A; Wu, C Y; Bond, E; Chadwick, M B ^[5]

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1. Duke University and TUNL, Durham, NC 27708 (United States)
2. University of North Carolina at Chapel Hill and TUNL, Chapel Hill, North Carolina 27599 (United States)
3. North Carolina State University and TUNL, Raleigh, North Carolina 27695 (United States)
4. North Carolina A and T State University and TUNL, Greensboro, North Carolina 27411 (United States)
5. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

The (n,2n) cross section of the radioactive isotope {sup 241}Am (T{sub 1/2}=432.6 y) has been measured in the incident neutron energy range from 7.6 to 14.5 MeV in steps of a few MeV using the activation technique. Monoenergetic neutron beams were produced via the {sup 2}H(d,n){sup 3}He reaction by bombarding a pressurized deuterium gas cell with an energetic deuteron beam at the TUNL 10-MV Van de Graaff accelerator facility. The induced {gamma}-ray activity of {sup 240}Am was measured with high-resolution HPGe detectors. The cross section was determined relative to Al, Ni, and Au neutron activation monitor foils, measured in the same geometry. Good agreement is obtained with previous measurements at around 9 and 14 MeV, whereas for a large discrepancy is observed when our data are compared to those reported by Perdikakis et al. near 11 MeV. Very good agreement is found with the END-B/VII evaluation, whereas the JENDL-3.3 evaluation is in fair agreement with our data.

• OSTI ID: 21189997
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 77; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMERICIUM 240
AMERICIUM 241
CROSS SECTIONS
DEUTERIUM
DEUTERIUM TARGET
DEUTERON BEAMS
EVALUATION
FOILS
GAMMA RADIATION
HELIUM 3
HIGH-PURITY GE DETECTORS
MEV RANGE
NEUTRON BEAMS
NEUTRON SOURCES
NEUTRONS
NUCLEAR REACTIONS
RESOLUTION
VAN DE GRAAFF ACCELERATORS