Elastic Scattering of Protons fromMg24

Abstract

The differential scattering cross section has been determined for protons scattered elastically from Mg 24 at a laboratory angle of 164°±5°. The targets consisted of thin Mg 24 F2 films evaporated onto thick graphite. Protons scattered elastically from Mg 24 were selected by a 90° magnetic analyzer and were counted by a proportional counter. At least nine anomalies occur in the cross section between 0.40 Mev and 3.95 Mev, indicating the excitation of nine levels of the compound nucleus, Al 25 . At several of the resonances, competing reaction cross sections have been shown to be relatively small.

Measurements of proton induced γ-ray emission cross sections on MgF2 target in the energy range 1.95–3.05MeV

“…Also, we observed two very strong resonances at proton energies of 2.01 and 2.41 MeV. These resonances were found by Mooring et al [34] in proton elastic scattering and Litherland et al [35] additionally measured the angular distributions of the 1369 keV c-ray at the resonances. Energy level scheme trough which resonances in the 24 Mg(p,pc 1À0 ) 24 Mg reaction proceed with the emission of 1369 keV c-rays could be find in Ref.…”

Nondestructive atomic compositional analysis of BeMgZnO quaternary alloys using ion beam analytical techniques

“…1 shows the elastic backscattering cross-sections () of Be [29], O [31], Mg [32], Al [33,34], and Zn [36] elements for He + and H + as a function of the ion energy, used in the RBX spectrum evaluation procedure. Note the Al atoms are present in the sapphire substrate only while oxygen atoms are present in sapphire, in the buffer ZnO layer, and in the BeZnO and BeMgZnO layers, too.…”

“…M a n u s c r i p t M a n u s c r i p t M a n u s c r i p t [32], Al [33,34], and Zn [36], used in the spectrum evaluation procedure. Gray stripes show the energy lost by (a) 1 MeV He + and (b) 2.53 MeV H + projectiles through electronic stopping when crossing a 150 nm-thick ZnO layer.…”

“…The spectrum evaluation has been performed as an iterative manual procedure treating a set of spectra in turn until selfconsistency has been achieved between the He + -RBS and p-EBS spectra recorded on the same sample at different tilt angles. In the evaluation, the Rutherford cross-section data for He + backscattering were considered, while the non-Rutherford elastic proton backscattering crosssection data for Be [20,21,29], O [30,31], Mg [32], and Al [33][34][35] were adopted from the literature. Note for Be data from Leavitt [21] and data from Mashkarov [29] agree well within A c c e p t e d M a n u s c r i p t the Leavitt's experimental uncertainty of 5% in the energy range of interest (2500-2530 keV).…”

Evaluation of non-Rutherford proton elastic scattering cross-section for magnesium

“…The differential proton elastic scattering cross sections for magnesium in the energy range from Coulomb scattering to 2.5 MeV were found in four papers: Mooring et al (1951) [4], Rauhala et al (1988) [5], Zhang et al (2003) [6], and Wang et al (1972) [7]. The reported data were measured at laboratory angles of 164.5° (Mooring), 170° (Rauhala), 140°, 150°, 160°, 170° (Zhang), and 130°,150° (Wang) in the energy range of 0.40-3.95, 0.8-2.7, 0.8-2.5, and 1.5-3.0 MeV respectively.…”