Experimental investigation of the residues produced in the 136Xe+Pb and 124Xe+Pb fragmentation reactions at 1 A GeV

TL;DR

This study measures nuclide cross sections and velocity distributions of residues from 136Xe+Pb and 124Xe+Pb fragmentation at 1 A GeV, revealing isotopic memory and different velocity behaviors across mass ranges.

Contribution

It provides detailed experimental data on nuclide production and velocity distributions for these reactions, highlighting the preservation of projectile N/Z ratio effects.

Findings

Velocity distributions are Gaussian for A > 20.

Lighter residues show complex velocity behavior.

Isotopic distributions retain projectile N/Z ratio memory.

Abstract

This paper presents the nuclide cross sections and the longitudinal velocity distributions of residues produced in the reactions of 136Xe and 124Xe at 1 A GeV in a lead target, measured at the high-resolution magnetic spectrometer, the Fragment Separator (FRS) of GSI. The data cover a broad range of isotopes of the elements between Z = 3 and Z = 56 for 136Xe and between Z = 5 and Z = 55 for 124Xe, reaching down to cross sections of a few microbarns. The velocity distributions exhibit a Gaussian shape for masses above A = 20, while more complex behaviour is observed for lighter masses. The isotopic distributions for both reactions preserve a memory on the projectile N/Z ratio over the whole residue mass range.