Nuclear reactions in Rb, Sr, Y, and Zr targets

Details Nuclear reactions in Rb, Sr, Y, and Zr targets Nuclear reactions in Rb, Sr, Y, and Zr targets

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982phrvc..26..931r&link_type=abstract

Physical Review C (Nuclear Physics), Volume 26, Issue 3, September 1982, pp.931-943

Physics

Nuclear Physics

13

Scientific paper

Excitation functions of all stable or long-lived krypton isotopes were measured or estimated for incident protons and neutrons in Rb, Sr, Y, and Zr targets. Experimental data concern mostly Y and Zr targets bombarded with 0.059 to 24 GeV protons. The products 78-86Kr, 74As, 75Se, 83,84,86Rb, 85Sr, 88Y, 88,95Zr, and 92Nbm were measured using high-sensitivity mass spectrometry and nondestructive γ counting. Lighter products such as 38,39,42Ar and 12 radioactive isotopes from 7Be to 65Zn were also measured in some cases and their cross sections are given in an appendix. Most excitation functions pass through a maximum between 0.4 and 0.8 GeV, and the peak energy could depend on the ΔA value. The results, combined with a general survey of nuclear reactions in Ga to Nb targets, permitted the development of new systematics leading to the calculation of spallation-produced Kr isotopes in the moon bombarded with galactic and solar cosmic rays. Compared to cosmogenic krypton measured in nine well-documented lunar samples, 83Kr is predicted with a precision better than 33% (1σ) and the production ratios iKr/83Kr are predicted to better than 25%. It is concluded that the cosmogenic ratios 86Kr/83Kr and 81Kr/83Kr are dependent on the main target element concentrations. This should be taken into account in strontium-rich samples when calculating exposure ages of extraterrestrial materials. NUCLEAR REACTIONS 89Y and Zr, (p, spallation) E=0.059-24 GeV; measured σ(E) for 78-86Kr and 12 radioactive products. Systematics of p- and n-induced reactions in Rb, Sr, Y, and Zr. Cosmogenic krypton.

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