Calculation of the production cross sections of high-spin isomeric states in hafnium

Conference · Sun Jan 01 00:00:00 EST 1989

DOI:https://doi.org/10.13182/NSE91-A23812· OSTI ID:5396266

Chadwick, M B; Young, P G ^[1]

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1. Oxford Univ. (UK). Nuclear Physics Lab.

The J{sup {pi}} = 16{sup +} isomeric state in {sup 178}Hf(E{sub x} = 2.447 MeV), which has a halflife of 31 years, poses a threat for serious radioactive activation problems in some fusion reactor designs if its production in 14-MeV neutron reactions is significant. The relatively high excitation energy (2.447 MeV) of this state results in it lying in the continuum region, so it is necessary in a calculation to reconstruct the salient nuclear structure around the state, particularly rotational band levels that might be populated and would feed into it. Using preequilibrium and Hauser-Feshbach statistical theories, the cross sections for this and other hafnium isomeric states are calculated and compared with experimental measurements, where available. 13 refs., 6 figs., 3 tabs.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: DOE/ER; UKAEA
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5396266
• Report Number(s): LA-UR-89-3068; CONF-890982-6; ON: DE90001836; TRN: 89-031592
• Resource Relation: Journal Volume: 108; Journal Issue: 2; Conference: International meeting on neutron activation cross sections for fission and fusion energy applications, Argonne, IL (USA), 11-15 Sep 1989
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
FIRST WALL
DAMAGING NEUTRON FLUENCE
HAFNIUM 178
NEUTRON REACTIONS
HAFNIUM 179
CROSS SECTIONS
ISOMERIC TRANSITIONS
NUCLEAR STRUCTURE
OPTICAL MODELS
BARYON REACTIONS
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HADRON REACTIONS
HAFNIUM ISOTOPES
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
NEUTRON FLUENCE
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
STABLE ISOTOPES
THERMONUCLEAR REACTOR WALLS
700201* - Fusion Power Plant Technology- Blanket Engineering
651820 - Nuclear Properties & Reactions
A=150-189
Experimental