Solar cosmic ray records in lunar rock 64455

Cross section measurements at neutron energies 71 and 112MeV and energy integrated cross section measurements (0.1<En<750MeV) for the neutron induced reactions O(n,x)10Be, Si(n,x)10Be, and Si(n,x)26Al

“…4. Also shown are previously reported measurements for these cross sections at energies <38 MeV [7] and the compiled proton induced excitation function for Si(p,x) 26 Al [6]. Unlike the cross sections for the production of 10 Be from O, the cross sections for the production 26 Al from Si by neutrons are similar to those from protons at low energies (<40 MeV) [7].…”

“…The neutron induced cross section for Si(n,x)10Be at 112 MeV is shown in Fig. 3 along with the compiled proton-induced reaction Si(p,x) 10 Be [6]. Although the neutron-induced cross section is slightly higher than the corresponding proton cross section, the difference is smaller than that was found for 10 Be from O.…”

“…2-4, along with corresponding cross sections for the proton-induced reactions, O(p,x) 10 Be, Si(p,x) 10 Be, and Si(p,x) 26 Al. This compilation of proton cross sections are taken from literature data [6].…”

“…The difference between the 26 Al/ 10 Be ratios obtained in the white neutron experiments can be explained by differences in the target positions. In the earlier 10 Be compiled by [6]. Only an upper limit (<0.1 mb) for the O(n,x) 10 Be cross section at 14.6 MeV was published [21].…”

“…A comprehensive compilation of reactions and their products must necessarily consider proton and neutron reactions. Most of the relevant cross sections for proton-induced reactions, such as those producing 10 Be, 26 Al, and 36 Cl, have been measured over a wide energy range [6]. There are however very few cross section measurements for neutron-induced reactions at energies higher than 15 MeV (e.g., [7,8]).…”