Nuclear-rainbow effects by transfer reactions in the α_12C interaction

D’Arrigo, A.; Fazio, Giovanni; Giardina,; Goryunov, O.Yu.; Ilyin, A.P.; Sacchi, M.; Shvedov, A. A.; Tacconi, A.; Vishnevsky, I. N.; Zaiats, I. Yu.

doi:10.1007/bf02775774

Cited by 9 publications

(1 citation statement)

References 5 publications

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“…The cross sections for inelastic scattering to the 4.440-MeV state determined in the line shape analyses at E α = 50, 60, 75 and 90 MeV and the one from the inelastic scattering angular distributions at E α = 51, 65, 72 and 90 MeV (see Refs. [15,23,8,7]) agree to better than 30%, which is compatible with estimated uncertainties. The TALYS predictions for inelastic scattering to the 4.440-MeV state are by factors of about 3 to 8 below these values.…”

Section: Lab Energy (Mev) Cross Section (Mb)supporting

confidence: 86%

γ -ray emission in α -particle interactions with C, Mg, Si, and Fe at Eα=50–90 MeV

et al. 2021

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Nuclear deexcitation lines are regularly observed in the gamma-ray emission spectra of strong solar flares. The most prominant lines are produced by interactions of protons and α particles, accelerated up to hundreds of MeV, with abundant nuclei of the solar atmosphere. Analysis and interpretation of these lines, which carry valuable information on the solar flare properties, need cross section data for the gamma-ray line emission in these interactions for a wide particle energy range. To this purpose, we measured the γ-ray emission in interactions of α-particle beams of E α = 50 -90 MeV with target foils of C, Mg, Si and Fe at the center for proton therapy of the Helmholtz-Zentrum Berlin. Setups of 3 high-purity Ge detectors and 1 LaBr 3 :Ce detector have been employed to detect the γ rays in 2 experiment campaigns. Relatively large distances of the detectors from the target and pulsed beams with sub-ns wide pulses allowed the separation of beam-induced prompt γ-ray emission from the targets from other γ rays and neutron-induced background. γ-ray production cross sections for about 60 deexcitation lines from excited target nuclei or reaction products have been determined. For the strongest deexcitation lines from the major target isotopes, 12 C, 24 Mg, 28 Si, 56 Fe, there are now measured cross section data from reaction threshold to E α = 90 MeV that can be directly used for astrophysical applications like solar flares. Comparison of the results with a cross section compilation for strong γ-ray lines in solar flare emissions and the predictions of the TALYS nuclear reaction code were done. They underline the importance of cross section determinations at accelerator laboratories for the establishment of an accurate cross section data base in a wide projectile energy range.

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Section: Lab Energy (Mev) Cross Section (Mb)supporting

confidence: 86%