Non statistical reaction contributions in (?, n) excitation functions

Abstract

The excitation function 24Mg(e, n)278i has been measured from threshold to 27 MeV excitation energy. A survey is given of the experimental excitation functions * 2C(e, n) a sO, 160(e, n)19Ne, Z~ n)Z3Mg and 24Mg(e, n)27Si and HF calculations have been made for them. The agreement is good within a factor of 2. The deviations of the experimental data from the pure statistical cross sections show common structures which can be interpreted as direct contributions.

The reaction12C(?,p 0)15N around 18 mev excitation energy of16O

“…The strong resonance at /~ex = 18.1 MeV (F=220keV) in the integral cross section of the reaction *2C(e,n) [1] is not found in the mirror reaction 12C(c~,p) as is expected from isospin conservation and penetrability considerations. Similar structures have been found in several (a, n) excitation functions of alpha-like nuclei [3,4]. The proton channels to excited states of *SN are still suppressed by the Coulomb barrier.…”

Cross sections of α-induced reactions for targets with masses A ≈ 20–50 at low energies

“…The 24 Mg(α,n) 27 Si reaction has been studied by Cheng et al [118], by Blyth et al [136], and by Gruhle et al [137]. The data are shown in Fig.…”

“…At very low energies individual resonances of the 24 Mg(α,γ) 28 Si reaction dominate. [118,136,137,138]. Further discussion see text.…”

“…Also the 24 Mg(α,p) 27 Al reaction has a slightly negative Q-value (Q = −1.60 MeV), and practically no experimental data Cross section of the 24 Mg(α,n) 27 Si and 24 Mg(α,p) 27 Al reactions. The experimental data have been taken from [118,136,137,138]. Further discussion see text.…”

“…5, but for α-induced reactions on 24 Mg. The experimental data have been taken from [118,136,137,138]. Further discussion see text.…”