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Abstract

The cross section for the reaction "93"Nb(n,n')"93"rm m""Nb was measured by foil activation to be (265.9 pm 9.8) mbarn at a neutron energy of (7.91 pm 0.02) MeV relative to the "238"(n,f) cross section employing a small ionization chamber as neutron fluence monitor. The mass of the fissile reference deposit was assessed relative to the mass of Al foils by means of a separate irradiation experiment with 14.8 MeV neutrons, thus relying on the "238"(n,f)/,"27"Al(n,alpha) cross section ratio at this energy. The induced "93"rm m""Nb activity was measured detecting the Nb K-shell X rays from the 30.7 keV isomeric transition by means of a Si(Li) X-ray detector. Sample size effects due to self- attenuation of the Nb X rays, extension of the sample, inhomogeneous foil activation and K-shell X-ray fluorescence induced by background radiation were experimentally determined. The result indicates, together with other recently available experimental data, that the cross section information included in the International Reactor Dosimetry File should be revised.

Additional information

Authors: WAGNER M, INSTITUT FUER RADIUMFORSCHUNG UND KERNPHYSIK DER UNIVERSITAET WIEN (AUSTRIA);JRC GEEL ESTAB. (BELGIUM);WINKLER G, INSTITUT FUER RADIUMFORSCHUNG UND KERNPHYSIK DER UNIVERSITAET WIEN (AUSTRIA);JRC GEEL ESTAB. (BELGIUM);VONACH H, INSTITUT FUER RADIUMFORSCHUNG UND KERNPHYSIK DER UNIVERSITAET WIEN (AUSTRIA);JRC GEEL ESTAB. (BELGIUM);LISKIEN H INSTITUT FUER RADIUMFORSCHUNG UND KERNPHYSIK DER UNIVERSITAET WIEN (AUSTRIA), INSTITUT FUER RADIUMFORSCHUNG UND KERNPHYSIK DER UNIVERSITAET WIEN (AUSTRIA);JRC GEEL ESTAB. (BELGIUM);JRC GEEL ESTAB. (BELGIUM), INSTITUT FUER RADIUMFORSCHUNG UND KERNPHYSIK DER UNIVERSITAET WIEN (AUSTRIA);JRC GEEL ESTAB. (BELGIUM)
Bibliographic Reference: INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY, MITO (JAPAN), MAY, 30-JUNE, 3, 1988, AVAILABILITY: CEC-LUXEMBOURG, DG-XIII-C-3, POB 1907, MENTIONING PAPER EN 34036 ORA
Availability: Can be ordered online
Record Number: 1989126108000 / Last updated on: 1989-06-01
Category: PUBLICATION
Available languages: en
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