A pair spectrometer for measuring multipolarities of energetic nuclear transitions

TL;DR

This paper presents a newly designed multi-detector array for measuring energy and angular correlations of electron-positron pairs from nuclear transitions, demonstrating its effectiveness through experiments on various isotopes.

Contribution

The paper introduces a novel pair spectrometer capable of simultaneous energy and angular correlation measurements for high-energy nuclear transitions.

Findings

Effective measurement of electron-positron angular correlations between 50 and 180 degrees.

Successful comparison of experimental data with GEANT simulations.

Demonstrated capability for high-resolution measurements in the 6-18 MeV energy range.

Abstract

A multi-detector array has been designed and constructed for the simultaneous measurement of energy- and angular correlations of electron-positron pairs. Experimental results are obtained over a wide angular range for high-energy transitions in 16O, 12C and 8Be. A comparison with GEANT simulations demonstrates that angular correlations between 50 and 180 degrees of the electron-positron pairs in the energy range between 6 and 18 MeV can be determined with sufficient resolution and efficiency.