Neutron induced reaction cross sections for the radioactive target nucleus 99Tc

Reimer, Peter; Koning, A. J.; Plompen, A.; Qaim, S.M.; Sudár, S.

doi:10.1016/j.nuclphysa.2008.10.014

Cited by 12 publications

(10 citation statements)

References 43 publications

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“…The spectral index method [32] revealed that large corrections were required for the 204 Pb(n,n γ ) 204 Pb m reaction cross section at the highest neutron energies studied, as a consequence of the low-energy neutron background. Similar results were found earlier for the 89 Y(n,n γ ) 89 Y m [33] and 99 Tc(n,n γ ) 99 Tc m [34] reactions. Corrections for the remaining reactions were negligible due to the relatively high effective reaction threshold.…”

Section: E Processing Count Rates Into Cross Sectionssupporting

confidence: 91%

Neutron activation cross sections on lead isotopes

et al. 2009

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204,206 Pb as target nuclei with natural lead samples were enabled through a precise measurement of the isotopic ratios. For a first investigation of the consequences of the present data for nuclear reaction models they were confronted with calculations based on global parameter systematics in a phenomenological and in a microscopic approach and with parameters selected to reproduce the available data. The TALYS code was used for the former two calculations involving parameter systematics while the STAPRE code was used for the latter calculation.

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Section: E Processing Count Rates Into Cross Sectionssupporting

confidence: 91%

Neutron activation cross sections on lead isotopes

et al. 2009

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“…Recently, Reimer et al [24] measured the cross-sections in a wide energy range of [8][9][10][11][12][13][14][15][16][17][18][19][20] MeV. The present result as well as ENDF/B-VII.0 and JEFF-3.1.1 reasonably reproduces their data.…”

Section: (N P) Reaction Cross-sectionsupporting

confidence: 86%

“…The present result as well as ENDF/B-VII.0 and JEFF-3.1.1 reasonably reproduces their data. However, experimental data [23,24,35,42] at around 14 MeV provided somewhat larger cross-sections, compared with the present evaluation. JENDL-4.0 only gives cross-sections reasonable to explain the large ones.…”

Section: (N P) Reaction Cross-sectioncontrasting

confidence: 58%

“…The contribution of knockout process was enhanced by a factor of 5.1 to reproduce available experimental data [23,24] of the 99 Tc(n, a) reaction cross-section.…”

Section: Preequilibrium Modelmentioning

confidence: 99%

“…The production cross-sections of metastable isomer (E x ¼ 142.68 keV) by inelastic scattering are calculated and compared to JEFF-3.1.1 and experimental data [23,24,35,43,44] in Figure 5. In order to explain the measured cross-sections, DWBA calculation to 142.68 keV-level using neutron local OMP [12] for 99 Tc was performed with angular momentum transfer L ¼ 4 and normalization parameter b 0 ¼ 0.14.…”

Section: Other Reaction Cross-sectionsmentioning

confidence: 99%

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Evaluation of neutron nuclear data for Technetium-99

Iwamoto

2012

Journal of Nuclear Science and Technology

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Neutron nuclear data of 99 Tc was evaluated, considering cross-sections and spectra provided from recent experiments. The evaluation was made in the incident neutron energy range from 1 keV to 20 MeV, using the optical model and nuclear reaction models. The optical model calculation based on the coupledchannels method was performed for the interaction of neutrons with 99 Tc, and potential parameters appropriately chosen reasonably explain the measured data of total cross-section. The cross-section of inelastic scattering, capture, (n, 2n), (n, p), (n, a) and (n, n 0 a) reactions, and g-ray emission spectra were calculated on the basis of statistical model with preequilibrium and direct components, and they were compared with available experimental data. It is found that the presently evaluated cross-sections and g-ray emission spectra well reproduce those experimental values and that there is a large discrepancy among the present result and evaluated data for neutron emission spectra. The obtained capture crosssection increases at the energies below 1 MeV, relative to that in JENDL-4.0. This makes the transmutation efficiency of 99 Tc into stable 100 Ru by accelerator driven system enhanced. The production cross-section of 99 Mo important for the medical use of nuclear diagnostics reduces by 5-30% at the energies above 12 MeV, compared with JENDL-4.0.

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Neutron Cross Section Measurements

Block

Danon

Gunsing

et al. 2010

Handbook of Nuclear Engineering

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The main emphasis during the past year has been on analyzing and publishing results and the preparation for the impending start-up of the newly modified Nevis cyclotron. Papers on the separated isotopes of Yb and W have been submitted to the Physical Review. The published results on Er confirm Dyson's theory of level spacing systematics. The total cross section, resonance parameters and spin-parity values of Na below 300 keV have been submitted for publication. A report on the evaluation of the T's of U 238 has been distributed. We now have extensive results on the Er isotopes, 232 U, 152 > 15lt Sm, 151 , 153 Eu, Fe, La, In, Ta, F, Mg, Al, S, CI, K and Ca. A paper on the precision measurement of the 2200 m/sec neutron-proton capture cross section has been submitted for publication. The background for fission measurements has been extensively analyzed and modifications to the neutron source of the Nevis cyclotron will be made for the next run. New methods of analyzing low count rate data have been developed to eliminate observation of spurious levels. The captive cross sections of thulium and rhodium have been analyzed and the results reported. During the report period, our main emphasis has been on analyzing and publishing data, and the preparation for the impending startup of the newly modified Nevis cyclotron. A number of major papers and reports on our results have been published or submitted for publication. Papers on the neutron resonance spectroscopy and systematics of the separated Yb isotopes and the separated W isotopes have been submitted to the Physical Review. These papers round out our recent work on many of the rare earth isotopes, 150<_ A< 190, with a paper on the separated even Gd isotopes in preparation and tne separated Dy isotopes expected to be ready soon. The published paper on the Er isotopes, confirming Dyson's theories concerning level spacings systematics, has led to extensive Monte-Carlo theoretical studies by our group, partly on the basis of interactions with Professor Freeman Dyson. These studies have extended the understanding of the implications of the statistical orthogonal ensemble theory and have permitted a detailed comparison with our results for many even-even nuclei, 150 < A< 190, which supports this theory well for the first time. "The total cross section, resonance parameters and spin-parity values for Na below 300 keV has been submitted to Nuclear Science and Engineering for publication. An evaluation report on the total radiation widths of the important reactor material 238 U has concluded that there is no convincing evidence for quasi-periodic structure in r versus energy (apart from a statistical level to level fluctuation of a high chi-squared number of degrees of freedom). The fluctuations in r present in many data sets are most likely due to experimental uncertainties in the r values themselves. Our best evaluated average radiation width was taken to be = 23.55 + 0.16 meV. T We now have.extensive results for the resonance parameters and systematics for a large ...

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Neutron induced reaction cross sections for the radioactive target nucleus 99Tc

Cited by 12 publications

References 43 publications

Neutron activation cross sections on lead isotopes

Neutron activation cross sections on lead isotopes

Evaluation of neutron nuclear data for Technetium-99

Neutron Cross Section Measurements

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