Abstract
A comprehensive set of 110 radioactive nuclide cross sections with mass num- bers 22 ≤ A ≤ 198 amu in the interaction of 4.4-GeV deuterons with 197 Au have been measured for the first time. The results including charge distributions have been parame- terized in term of a 3-parameter equation in order to reproduces the isobaric distributions. Using data from the charge distributions, the total mass-yield distribution was obtained. The new experimental data of the recoil properties of reaction products were also ob- tained. Kinematical characteristics of the reaction products obtained from measurements of the residuals emitted in the forward and backward directions exhibit different behav- ior depending on the mass region. The kinematical features of reaction products have been analyzed on the basis of the two-step model of high-energy nuclear reactions and discussed in terms of the different reaction mechanisms.
Highlights
Spallation reactions with Au target have been investigated for many years but have not been precisely described yet
In order to obtain a complete picture of the mass distribution of the reaction products, it is necessary to estimate the cross sections of isotopes immeasurable by the inducedactivity method
An interesting feature is that the width of charge distribution of the present work is the same as for the system 197Au+p at 1.0-3.0 GeV [1], but in the present work the center of the charge distribution is shifted towards the neutron deficient side of the valley of beta-stability
Summary
Spallation reactions with Au target have been investigated for many years but have not been precisely described yet. The absence of a satisfactory theoretical description to predict isotope yields as well as the need for experimental fragment mass and charge distributions forms the motivation for this work. This experiment was performed with activation methods of the measurement of products formed in the interaction of an Au target with deuterons. The recoil data provide in addition valuable information, such as angular distributions and kinetic energies of product nuclei as well. They deepen our understanding of the reaction mechanism
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