[en] Cross sections, averaged over a ²³⁵U fission neutron spectrum, of some threshold reactions induced on zinc after short irradiations, have been measured. The studied reactions and the corresponding values are: ⁶⁴Zn(n, p)⁶⁴Cu, (37.4±1.4) mb; ⁶⁴Zn(n, 2n)⁶³Zn, (23.4±2.0) μb; ⁶⁶Zn(n, p)⁶⁶Cu, (0.775±0.079) mb; ⁶⁸Zn(n, p)^68mCu, (5.32±0.65) μb; and ⁶⁸Zn(n, α)⁶⁵Ni, (52.1±2.3) μb, all referred to the cross section of the ²⁷Al(n, p)²⁷Mg standard reaction, (3.84±0.18) mb. Working values for the resonance integrals of the reactions ⁷⁰Zn(n, γ)⁷¹Zn and ⁷⁰Zn(n, γ)^71mZn, referred to the tabulated value for the resonance integral of the ⁶⁸Zn(n, γ)^69mZn reaction, (0.24±0.03) b, were also obtained. The results were (0.1350±0.0093) b and (0.157±0.029) b, respectively. (orig.)

[en] The present work deals with the determination of fission averaged cross-sections, and the measurement of working values of the resonance integrals, for some reactions induced on zinc by the epicadmium spectrum (epithermal and fast neutrons) of a reactor. The reactions studied were: ⁶⁴Zn(n,p)⁶⁴Cu; ⁶⁴Zn(n,2n)⁶³Zn; ⁶⁶Zn(n,p)⁶⁶Cu; ⁶⁸Zn(n,p)^68mCu; ⁶⁸Zn(n,α)⁶⁵Ni; ⁷⁰Zn(n,γ)⁷¹Zn; and ⁷⁰Zn(n,γ)^71mZn. (orig.)

[en] We have measured the cross sections, averaged over a ²³⁵U fission neutron spectrum, for the two high threshold reactions: ⁷⁵As(n,p)⁷⁵mGe and ⁷⁵As(n,2n)⁷⁴As. The measured averaged cross sections are 0.292±0.022 mb, referred to the 3.95±0.20 mb standard for the ²⁷Al(n,p)²⁷Mg averaged cross section, and 0.371±0.032 mb referred to the 111±3 mb standard for the ⁵⁸Ni(n,p)^58m+gCo averaged cross section, respectively. The measured averaged cross sections were also evaluated semi-empirically by numerically integrating experimental differential cross section data extracted for both reactions from the current literature. The calculations were performed for four different representations of the thermal-neutron-induced ²³⁵U fission neutron spectrum. The calculated cross sections, though depending on analytical representation of the flux, agree with the measured values within the estimated uncertainties. (author)