Fast-neutron-induced fission studied by gamma-spectroscopy.
- Ronald O.
- Nikolaos
- Matthew J.
- Glen D.
- Thierry
- Walid
- Paul E.
- John A.
- Lee A.
Prompt gamma-ray and x-ray spectroscopy techniques are being employed to study fast-neutron-induced fission of actinides to determine independent (pre-beta-decay) yields for a wide range of product nuclides. Data are acquired using the GEANIE high-resolution gamma-ray spectrometer at the LANSCE/WNR unmoderated spallation neutron source providing neutrons with energies from below 1 MeV to over 400 MeV. Three different techniques (identification by characteristic gamma rays, by gamma-gamma coincidences, and by fission-gamma coincidences) are being used to gather complementary data sets from which detailed fission yields can be extracted. From these data, mass and charge distributions are determined over a wide incident-neutron energy range. The phenomena of interest include the transition from asymmetric to symmetric fission, the competition between neutron and gamma-ray emission, nuclear structure effects in fission and the angular momentum imparted to the fission products. Results for 238U and 236U are presented.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 976365
- Report Number(s):
- LA-UR-02-6252; TRN: US1006888
- Resource Relation:
- Conference: Submitted to: 11th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics, Pruhonice, Czech Republic, September 2-6, 2002
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDES
ANGULAR MOMENTUM
CHARGE DISTRIBUTION
ENERGY RANGE
FISSION
FISSION PRODUCTS
FISSION YIELD
GAMMA SPECTROSCOPY
ISOTOPES
NEUTRON SOURCES
NEUTRONS
NUCLEAR STRUCTURE
SPALLATION
SPECTROMETERS
SPECTROSCOPY
X-RAY SPECTROSCOPY