3He induced reactions

Abstract

This report presents a review of the results obtained from study of 3He induced nuclear reactions prior to June 1959. Following a brief historical survey including rangeenergy, energy loss, and stopping power data as well as a reaction Q value tabulation, the experimental results are first presented in terms of their relevance to determination of the reaction mechanisms involved ; this is followed by a discussion of the use of 3He in nuclear spectroscopy. T h e next section is devoted to summarizing available 3He reaction data according to target nuclide involved. Numerous figures illustrating excitation curves, spectra and angular distributions are included. T h e report concludes with a short section devoted to suggested experiments which emphasizes the very great scope remaining for experimental work m-ith low-energy 3He accelerators. A comprehensive bibliography covering all publications on 3He reactions prior to June 1959, and including selected papers on experimental techniques as well as on the production and handling of 3He in accelerators, is appended.

Solar Neutrons and Related Phenomena

“…As noted , conspicuous features of Table 10.1 are that most of the reactions are exothermic and that the endothermic reactions have very low threshold energies. These characteristics are the reason that 3 He-induced reactions have marked advantages for nuclear research when only low-energy accelerators (less than 5 MeV) are available (e.g., Bromley and Almqvist 1960). This excess is also responsible for highly excited compound systems in these reactions and hence for their large cross sections.…”

Positron‐Emitter Production in Solar Flares from3He Reactions

“…This excess is also responsible for highly excited compound systems in these reactions and hence for their large cross sections. These characteristics are the reason that 3 He-induced reactions have marked advantages for nuclear research when only low-energy accelerators (less than 5 MeV) are available (e.g., Bromley & Almqvist 1960). Most of the products shown in Table 1 are radioactive positron-emitting nuclei.…”

The nuclear microprobe used to investigate meteorites

“…Using the nuclear microprobe, most promising is the (d,p) reaction at 1.3 MeV, which has an acceptable cross section on both isotopes [24]. (3He,p) reactions with a beam energy of 2.8 MeV has also been studied [25]. The latter reaction suffers from a considerably lower cross section.…”