Trends in nuclear reaction cross sections (IV). Recalculated (n,p) cross sections for 14.5 MeV neutrons of nuclei in the range 6 ≦ Z ≦ 50

doi:10.1016/0375-9474(67)90699-9

Nuclear Physics A

Volume 96, Issue 1, 7 April 1967, Pages 121-137

https://doi.org/10.1016/0375-9474(67)90699-9 Get rights and content

Abstract

In 1962 rough estimates were published of the absolute values of (n,p) cross sections of all stable isotopes of most of the elements. In this work we compute the relative (n,p) cross sections for isotopes of elements in the range 6 ≦ Z ≦ 50 using an equation, derived previously with the statistical model approach, in which only the level density parameter Q-value, pairing energy, effective Coulomb barrier and the energy of the incident neutron appear. The relative cross sections are used to compute absolute cross sections with the aid of an empirical equation. The latter cross sections agree with experiment in over 80% of the cases. The present calculations are compared with the predictions of the empirical equations of Levkovskii, and possible sources of shell effects in the observed cross sections are discussed.

References (14)

D.G. Gardner
Nuclear Physics
(1962)
D.G. Gardner et al.
Nuclear Physics
(1964)
J.H. Mattauch et al.
Nuclear Physics
(1965)
D.G. Gardner et al.
Nuclear Physics
(1962)
P. Strohal et al.
Nuclear Physics
(1962)
J. Jeronymo
Nuclear Physics
(1963)
A. Chatterjee
Nuclear Physics
(1963)

There are more references available in the full text version of this article.

Cited by (37)

A semiempirical approach to study the excitation functions for (n,p) reaction on the basis of evaporation and exciton models below 20 MeV
2004, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
A semiempirical approach for the excitation functions of (n,p) reaction was obtained on the basis of evaporation and exciton models with the energies range up to 20 MeV. Within the nuclide mass region of 23⩽A⩽209, the adjusted parameter of the semiempirical method was investigated, it has a strong dependence on (N−Z+1)/A and the incident neutron energy. The predictions of the excitation functions for (n,p) reaction for different nuclei are in good agreement with the experimental data.
Production of cosmogenic 36Cl on atmospheric argon
1996, Planetary and Space Science
A new empirical rule for the prediction of around 14 MeV neutron reaction cross sections
1990, Annals of Nuclear Energy
A formula with which we can predict the values of the (n, p), (n, α) and (n, 2n) reaction cross sections at around 14 MeV is found as an extension of the empirical rule by Horibe (1983) for the ²³⁵U fission neutron spectrum-averaged cross sections. The grouping of experimental data according to the neutron excess number of target nuclei is essential. Cross sections thus obtained are particularly in good agreement with the experimental ones on light nuclei.
Independent yields of 102mRh, 102gRh and 101gRh for thermal-neutron-induced fission of 235U
1981, Journal of Inorganic and Nuclear Chemistry
The independent fission yields of ^102mRh, ^102gRh and ^101gRh have been measured for thermal-neutron-induced fission of ²³⁵U. The yield of ^102mRh is (5.2 ± 2.5) · 10⁻¹⁰%, of ^102gRh (6.5 ± 1.7) · 10⁻¹⁰% and of ^101gRh (3.2 ± 0.8) · 10⁻¹¹%. The measured yields are compared with the ones calculated from the “normal” Gaussian charge dispersion curve with a width parameter σ = 0.56 ± 0.06.
On the simultaneous use of a Ge(Li) semiconductor and A NaI(Tl) scintillation detector in neutron activation cross-section measurements
1980, Nuclear Instruments and Methods
A Ge(Li) semiconductor and a NaI(Tl) scintillation spectrometer have been used independently for the simultaneous counting of gamma rays from the decay of some neutron activation reaction products. Cross sections for the reactions ⁵¹V(n, p)⁵¹Ti and ⁵⁵Mn(n, α)⁵²V at the 14.7 MeV neutron energy were measured by this arrangement in order to study whether the two-detector method could yield improved accuracy in activation experiments — specially concerning those existing cross section values showing large discrepancies and the cases where resolution limitations allow the use of the scintillation detector.
A systematic study of (n, p) reactions at 14.7 MeV
1977, Nuclear Physics, Section A
Cross sections for (n, p) reactions at 14.7 ± 0.3 MeV on forty-eight stable nucleides of the elements calcium, titanium, vanadium, chromium, iron, nickel, copper, zinc, gallium, germanium, arsenic, selenium, bromine, rubidium, strontium, iodine, rhenium, osmium, iridium, platinum and thallium have been measured by the activation technique using Ge(Li) detector γ-ray spectroscopy, wherever necessary chemical separation, and in many cases enriched isotopes as targets. Isomeric (n, p) cross-section ratios have been determined for the isomeric pairs ^46m,^gSc, ^60m,gCo, ^71m,gZn, ^84m,gRb and ^127m,g Te. The systematics of the (n, p) cross sections were re-investigated and for medium and heavy mass nuclei a strong dependence on (N − Z)/A has been observed. The isotope effect is interpreted in terms of the proton binding energy which varies as a function of (N − Z)/A. The relative competition between the (n, p), (n, α) and (n, 2n) reactions in various mass regions is discussed.

View all citing articles on Scopus

^†: On leave of absence from the Illinois Institute of Technology.

View full text

Article preview

Nuclear Physics A

Abstract

References (14)

Nuclear Physics

Nuclear Physics

Nuclear Physics

Nuclear Physics

Nuclear Physics

Nuclear Physics

Nuclear Physics

Cited by (37)

A semiempirical approach to study the excitation functions for (n,p) reaction on the basis of evaporation and exciton models below 20 MeV

Production of cosmogenic <sup>36</sup>Cl on atmospheric argon

A new empirical rule for the prediction of around 14 MeV neutron reaction cross sections

Independent yields of <sup>102m</sup>Rh, <sup>102g</sup>Rh and <sup>101g</sup>Rh for thermal-neutron-induced fission of <sup>235</sup>U

On the simultaneous use of a Ge(Li) semiconductor and A NaI(Tl) scintillation detector in neutron activation cross-section measurements

A systematic study of (n, p) reactions at 14.7 MeV