Bulk properties of iron isotopes

Nuclear level densities and radiative strength functions (RSFs) in {sup 56}Fe and {sup 57}Fe were measured using the {sup 57}Fe({sup 3}He, {alpha}{gamma}) and {sup 57}Fe({sup 3}He, {sup 3}He'{gamma}) reactions, respectively, at the Oslo Cyclotron Laboratory. A low-energy enhancement in the RSF...

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Bibliographic Details
Published in:Physics of atomic nuclei 2007-09, Vol.70 (9), p.1634-1639
Main Authors: Algin, E., Schiller, A., Voinov, A., Agvaanluvsan, U., Belgya, T., Bernstein, L. A., Brune, C. R., Chankova, R., Garrett, P. E., Grimes, S. M., Guttormsen, M., Hjorth-Jensen, M., Hornish, M. J., Johnson, C. W., Massey, T., Mitchell, G. E., Rekstad, J., Siem, S., Younes, W.
Format: Article
Language:English
Subjects:
COMPARATIVE EVALUATIONS
DEUTERON BEAMS
DEUTERONS
ENERGY-LEVEL DENSITY
GAMMA RADIATION
HELIUM 3
IRON 56
IRON 57
MANGANESE 55
MEV RANGE 01-10
NEUTRON EMISSION
NUCLEAR PHYSICS AND RADIATION PHYSICS
NUCLEAR REACTIONS
OHIO
OSLO CYCLOTRON
OSUR REACTOR
PHYSICAL PROPERTIES
SPECTRA
STRENGTH FUNCTIONS
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Summary:Nuclear level densities and radiative strength functions (RSFs) in {sup 56}Fe and {sup 57}Fe were measured using the {sup 57}Fe({sup 3}He, {alpha}{gamma}) and {sup 57}Fe({sup 3}He, {sup 3}He'{gamma}) reactions, respectively, at the Oslo Cyclotron Laboratory. A low-energy enhancement in the RSF below 4-MeV energy was observed. This finding cannot be explained by common theoretical models. In a second experiment, two-step cascade intensities with soft primary transitions from the {sup 56}Fe(n, 2{gamma}) reaction were measured. The agreement between the two experiments confirms the low-energy enhancement in the RSFs. In a third experiment, the neutron evaporation spectrum from the {sup 55}Mn(d, n){sup 56}Fe reaction was measured at 7-MeV deuteron energy at the John Edwards Accelerator Laboratory at Ohio University. Comparison of the level density of {sup 56}Fe obtained from the first and third experiments gives an overall good agreement. Furthermore, observed enhancement for soft {gamma} rays is strengthened by the last experiment.
ISSN:1063-7788
1562-692X
DOI:10.1134/S1063778807090232