Fission studies with 140 MeV $\bm{\alpha}$-Particles

TL;DR

This study investigates binary fission induced by 140 MeV alpha particles on various targets, measuring kinetic energies, fragment masses, and cross sections, revealing a minimum fission probability near a specific nuclear parameter.

Contribution

First measurements of fission induced by 140 MeV alpha particles on multiple targets, with systematic comparison and identification of a fission probability minimum.

Findings

Fission cross sections measured for multiple targets.

Observation of a minimum in fission probability near Z^2/A=24.

Comparison with existing data and systematics.

Abstract

Binary fission induced by 140 MeV $\alpha$-particles has been measured for $^{\rm nat}$Ag, $^{139}$La, $^{165}$Ho and $^{197}$Au targets. The measured quantities are the total kinetic energies, fragment masses, and fission cross sections. The results are compared with other data and systematics. A minimum of the fission probability in the vicinity $Z^2/A=24$ is observed.