/sup 94/Nb(n,. gamma. )/sup 95/Nb, /sup 95m/Nb reaction for the CTR reactor technology program

Conference · Wed Oct 01 04:00:00 EDT 1975 · Natl. Bur. Stand. (U.S.), Spec. Publ.; (United States)

OSTI ID:7362256

Persiani, P J ^[1]; Pennington, E M; Harker, Y D; Heath, R L

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1. Argonne National Lab., IL

Depending on the assumptions made of the neutron cross section behavior in the high-energy region, the captures in /sup 94/Nb have been found to be the major components influencing the afterheat and radioactivity in fusion reactor design problems. Preliminary blanket designs indicate that about 60 percent of the capture rates in /sup 94/Nb occur above 1 keV and 90 percent occur above 100 eV. Therefore an important and timely cross section need is an estimate and measurement of the /sup 94/Nb(n,..gamma..)/sup 95/Nb, /sup 95m/Nb reaction in the keV-MeV energy region. Nuclear level systematic studies using the two known positive energy resonances, the thermal cross section, the resonance integral and the apparent high-density of the low-lying levels in niobium, have suggested postulating the existence of negative energy levels or level. These considerations involved the postulated negative energy resonances, assumptions about positive energy resonances above 50 eV and average unresolved parameters based on nuclear systematics. The experimental technique to obtain a measured integrated cross-section in the fast fission spectrum of the Coupled Fast Reactivity Measurements Facility (CFRMF) and the Argonne Fast Source Reactor (AFSR) is investigated with foils of /sup 93/Nb containing 4.1 percent /sup 94/Nb utilizing Ge(Li) spectrometry. 5 tables, 2 figures (auth)

• OSTI ID: 7362256
• Conference Information: Journal Name: Natl. Bur. Stand. (U.S.), Spec. Publ.; (United States) Journal Volume: 425
• Country of Publication: United States
• Language: English

Related Subjects

651725* -- Nuclear Properties & Reactions
A=90-149
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AFTER-HEAT
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CAPTURE
CROSS SECTIONS
DAYS LIVING RADIOISOTOPES
ELECTROMAGNETIC RADIATION
GAMMA RADIATION
HADRON REACTIONS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
NEUTRON REACTIONS
NIOBIUM 94 TARGET
NIOBIUM 95
NIOBIUM ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-EVEN NUCLEI
RADIATIONS
RADIOISOTOPES
RESONANCE
TARGETS
THERMONUCLEAR REACTORS