Neutron-Transfer Reactions from the Nitrogen Bombardment of Be, C, O, Na, andMg24,25,26

Abstract

Excitation functions were measured for neutron-transfer reactions yielding ${\mathrm{N}}^{13}$ from the nitrogen bombardment of Be, C, O, Na, ${\mathrm{Mg}}^{24}$, ${\mathrm{Mg}}^{25}$, and ${\mathrm{Mg}}^{26}$. At the maximum incident energy of 27.5 Mev, the cross section varies from 0.14 mb for oxygen to 2.8 mb for magnesium-25. Nitrogen-13 was separated chemically from the targets and counted as ammonium tetraphenylboron. The chemical method was checked by measuring yields of both reaction products, ${\mathrm{N}}^{13}$ and ${\mathrm{Mg}}^{27}$, in the reaction ${\mathrm{Mg}}^{26}$(${\mathrm{N}}^{14}$,${\mathrm{N}}^{13}$)${\mathrm{Mg}}^{27}$. By plotting the transfer cross sections as a function of $E^{*}=E_{\mathrm{c}.\mathrm{m}.\mathrm{}}-E_{\mathrm{barrier}}+Q$, a systematic behavior of all the cross sections is displayed.