Über die Herstellung von Si³² durch einen (t,p)-Prozeß

Abstract

ZusammenfassungMit Tritonen aus dem Li

On the Production of No-Carrier-Added 32Si, a Potential Research Tool

“…A variety of different nuclear reactions have been used or considered by others as pathways to '^Si: 1) "C1 (p, a2p)"Si using 340 MeV [1], 420 MeV [6] and 52 MeV [8] protons 2) ''P (n, (n, p)'^Si, a sequential route considered by FORBERG [9] as the most promising method for production in a nuclear reactor 3) '^S (n, (n, p)"Si yielding '^Si as a by-product in the large-scale manufacturing of '^P in nuclear reactors [10] 4) Si (t, p)'^ Si either with tritons accelerated in a VAN DE GRAAFF machine, with enriched as the target [3], or indirectly in a nuclear reactor with Li-Si alloy as target material, the tritons being produced by the slow neutron reaction ®Li(n, a)T [11,12], The above processes with the exception of the fourth -the (t, p) reaction -give rise to a carrier-free product, at least in principle.…”

Dating of Polar Ice By 32Si

“…The use of cosmic-ray produced 32 Si for dating of ice and water (Lal and others, 1960; Clausen and others, 1968; Lal and others, 1970) has hitherto been complicated by the poor knowledge of the half life. The literature contains several estimates ranging from 60 to 710 years (Turkevich and Samuels, 1954; Geithof, 1962; Honda and Lal, 1964; Jantsch, 1967), all of which are based on assumptions about unknown cross-sections of nuclear processes leading to the formation of 32 Si. Direct measurement of the half life has not been attempted, mainly because of the difficulty in determining the number of 32 Si atoms in the small samples obtainable.…”