Partial Cross-Sections in High-Energy Nuclear Reactions, and Astrophysical Applications. I. Targets WITh Z <= 28. II. Targets Heavier than Nickel

Abstract

view Abstract Citations (329) References (105) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Partial Cross-Sections in High-Energy Nuclear Reactions, and Astrophysical Applications. I. Targets With z <= 28. Silberberg, R. ; Tsao, C. H. Abstract Cross-sections for nuclear breakup reactions at high energies are essential for interpreting important observations in cosmic-ray physics, astrophysics, and lunar and planetary science. Compared with the many cross-sections required, the variety and number actually measured thus far are very limited. Accordingly, we have devised new empirical formulae for high-energy cross- sections, using measured yields of proton interactions with various target nuclei (3 Zt < 28). They are applicable at energies > 100 MeV to all products with A > 6 for targets ranging from Li to Ni. The new relations are useful in regions where earlier empirical formulae break down completely. Moreover, they give significantly better estimates of cross-sections than those previously available. Thus, for 6 < Zt < 20, the relative standard deviation of a calculated cross-section (from a measured value where the latter is available) is typically 20 to 30 percent at energies above 150 MeV. Above 2 GeV, for 21 < Zt < 26 this deviation is roughly 40 percent; with decreasing energy, the ratio Ia p rises up to 1 ( + 1, -0.5) at 150 MeV. The new equations give estimates that are somewhat more accurate than Monte Carlo calculations; yet computations are much simpler and faster by orders of magnitude. Subject heading: nuclear reactions Publication: The Astrophysical Journal Supplement Series Pub Date: April 1973 DOI: 10.1086/190271 Bibcode: 1973ApJS...25..315S full text sources ADS |