Precise Measurement Of Cross Sections for the Reactions ⁹⁰Zr(n,2n)⁸⁹Zr and ⁵⁸Ni(n,2n)⁵⁷Ni from Threshold to 20 MeV

Author(s)

Gerhard Winkler, Andreas Pavlik, Herbert Vonach, Arno Paulsen, Horst Liskien

Abstract

The excitation functions for the reactions ⁹⁰Zr(n,2n)⁸⁹Zr and ⁵⁸Ni(n,2n)⁵⁷Ni were measured from 12.3 to 19.6 MeV in steps of 0.2 – 0.8 MeV using activation techniques. The reaction T(d,n)⁴He

was used to produce the neutrons. Neutron fluences were determined by

means of a proton-recoil telescope at 0° and the differential neutron

production cross sections. Additionally, in the energy range 13.4 – 14.8

MeV measurements were performed in smaller energy steps (0.02 – 0.15

MeV) relative to well known cross sections for the reference reaction ²⁷Al(n,α)²⁴Na.

Activity measurements were performed using a 12.7 cm x 12.7 cm NaI(Tl)

well-type detector. The new cross section data were evaluated together

with other experimental data from the literature to produce an improved

set of evaluated group cross sections and their uncertainties for the

reactions ⁹⁰Zr(n,2n)⁸⁹Zr and ⁵⁸Ni(n,2n)⁵⁷Ni, including covariance information. Spectrum-averaged cross sections for the ²⁵²Cf spontaneous-fission neutron field and the ²³⁵U fission spectrum were calculated on this basis and compared with available experimental integral data.

Organisation(s)

Isotope Physics

External organisation(s)

SCK-CEN Belgian Nuclear Research Centre, Forschungszentrum Jülich

Pages

400-403

No. of pages

4

DOI

https://doi.org/10.1007/978-94-009-7099-1_84

Publication date

1983

Austrian Fields of Science 2012

1030 Physics, Astronomy

Portal url

https://ucris.univie.ac.at/portal/en/publications/precise-measurement-of-cross-sections-for-the-reactions-90zrn2n89zr-and-58nin2n57ni-from-threshold-to-20-mev(d5f5310c-5e62-4d99-b5e7-acee3110e419).html