## Abstract

The excitation functions for the reactions {sup 19}F(n,2n){sup 18}F and {sup 93}Nb(n,2n){sup 92m}Nb, which are included in the International Reactor Dosimetry File (IRDF-90), were re-evaluated taking into account very recent experimental data. In the case of the reaction {sup 19}F(n,2n){sup 18}F the new measurements served to extend the neutron energy range beyond 20 MeV; for the {sup 93}Nb(n,2n){sup 92m}Nb reaction the new information concerning the energy region just above the threshold (9.0 - 10.6 MeV) substantially modified the results of the evaluation and thus the recommended cross sections in this energy region. The cross sections and their uncertainties were evaluated in energy groups with widths of 0.2 MeV to 2.0 MeV, and relative correlation matrices of the evaluated cross sections at the different energies were calculated. The results of the evaluation are compared with those given in the IRDF-90 and, in the case of {sup 93}Nb(n,2n){sup 92m}Nb, with a model calculation carried out by Strohmaier. The results of this work are intended to replace the corresponding data given in Physics Data 13-5 and the recommended cross sections for these two reactions in the IRDF-90. (author). 23 refs, figs and tabs.

## Citation Formats

Wagner, M.
Update of the evaluation of the cross sections for the neutron-dosimetry reactions {sup 19}F(n,2n){sup 18}F and {sup 93}Nb(n,2n){sup 92m}Nb.
IAEA: N. p.,
1991.
Web.

Wagner, M.
Update of the evaluation of the cross sections for the neutron-dosimetry reactions {sup 19}F(n,2n){sup 18}F and {sup 93}Nb(n,2n){sup 92m}Nb.
IAEA.

Wagner, M.
1991.
"Update of the evaluation of the cross sections for the neutron-dosimetry reactions {sup 19}F(n,2n){sup 18}F and {sup 93}Nb(n,2n){sup 92m}Nb."
IAEA.

@misc{etde_10113390,

title = {Update of the evaluation of the cross sections for the neutron-dosimetry reactions {sup 19}F(n,2n){sup 18}F and {sup 93}Nb(n,2n){sup 92m}Nb}

author = {Wagner, M}

abstractNote = {The excitation functions for the reactions {sup 19}F(n,2n){sup 18}F and {sup 93}Nb(n,2n){sup 92m}Nb, which are included in the International Reactor Dosimetry File (IRDF-90), were re-evaluated taking into account very recent experimental data. In the case of the reaction {sup 19}F(n,2n){sup 18}F the new measurements served to extend the neutron energy range beyond 20 MeV; for the {sup 93}Nb(n,2n){sup 92m}Nb reaction the new information concerning the energy region just above the threshold (9.0 - 10.6 MeV) substantially modified the results of the evaluation and thus the recommended cross sections in this energy region. The cross sections and their uncertainties were evaluated in energy groups with widths of 0.2 MeV to 2.0 MeV, and relative correlation matrices of the evaluated cross sections at the different energies were calculated. The results of the evaluation are compared with those given in the IRDF-90 and, in the case of {sup 93}Nb(n,2n){sup 92m}Nb, with a model calculation carried out by Strohmaier. The results of this work are intended to replace the corresponding data given in Physics Data 13-5 and the recommended cross sections for these two reactions in the IRDF-90. (author). 23 refs, figs and tabs.}

place = {IAEA}

year = {1991}

month = {Oct}

}

title = {Update of the evaluation of the cross sections for the neutron-dosimetry reactions {sup 19}F(n,2n){sup 18}F and {sup 93}Nb(n,2n){sup 92m}Nb}

author = {Wagner, M}

abstractNote = {The excitation functions for the reactions {sup 19}F(n,2n){sup 18}F and {sup 93}Nb(n,2n){sup 92m}Nb, which are included in the International Reactor Dosimetry File (IRDF-90), were re-evaluated taking into account very recent experimental data. In the case of the reaction {sup 19}F(n,2n){sup 18}F the new measurements served to extend the neutron energy range beyond 20 MeV; for the {sup 93}Nb(n,2n){sup 92m}Nb reaction the new information concerning the energy region just above the threshold (9.0 - 10.6 MeV) substantially modified the results of the evaluation and thus the recommended cross sections in this energy region. The cross sections and their uncertainties were evaluated in energy groups with widths of 0.2 MeV to 2.0 MeV, and relative correlation matrices of the evaluated cross sections at the different energies were calculated. The results of the evaluation are compared with those given in the IRDF-90 and, in the case of {sup 93}Nb(n,2n){sup 92m}Nb, with a model calculation carried out by Strohmaier. The results of this work are intended to replace the corresponding data given in Physics Data 13-5 and the recommended cross sections for these two reactions in the IRDF-90. (author). 23 refs, figs and tabs.}

place = {IAEA}

year = {1991}

month = {Oct}

}