Production of spin-controlled rare isotope beams

TL;DR

This paper introduces a new method for controlling the spin of rare isotopes using projectile fragmentation and momentum-dispersion matching, demonstrated experimentally with significantly improved efficiency over traditional techniques.

Contribution

A novel spin control technique for rare isotopes combining projectile fragmentation with momentum-dispersion matching, validated experimentally at RIKEN with enhanced performance.

Findings

Achieved 8% spin alignment in Al-32.

Method's figure of merit exceeds conventional methods by over 50.

Experimental verification confirms the method's effectiveness.

Abstract

The degree of freedom of spin in quantum systems serves as an unparalleled laboratory where intriguing quantum physical properties can be observed, and the ability to control spin is a powerful tool in physics research. We propose a novel method for controlling spin in a system of rare isotopes which takes advantage of the mechanism of the projectile fragmentation reaction combined with the momentum-dispersion matching technique. The present method was verified in an experiment at the RIKEN RI Beam Factory, in which a degree of alignment of 8% was achieved for the spin of a rare isotope Al-32. The figure of merit for the present method was found to be greater than that of the conventional method by a factor of more than 50.