The MUGAST-AGATA-VAMOS campaign : set-up and performance

TL;DR

The MUGAST-AGATA-VAMOS campaign demonstrates a highly integrated detector setup enabling precise exclusive measurements of nuclear reactions with radioactive beams, achieving high accuracy spectroscopy and efficient background rejection.

Contribution

This work presents the design, integration, and performance evaluation of a novel combined detector system for nuclear reaction studies at GANIL.

Findings

Successful commissioning with high-resolution spectroscopy

Effective background rejection through particle identification

Capability to handle high-intensity radioactive beams

Abstract

The MUGAST-AGATA-VAMOS set-up at GANIL combines the MUGAST highly-segmented silicon array with the state-of-the-art AGATA array and the large acceptance VAMOS spectrometer. The mechanical and electronics integration copes with the constraints of maximum efficiency for each device, in particular {\gamma}-ray transparency for the silicon array. This complete set-up offers a unique opportunity to perform exclusive measurements of direct reactions with the radioactive beams from the SPIRAL1 facility. The performance of the set-up is described through its commissioning and two examples of transfer reactions measured during the campaign. High accuracy spectroscopy of the nuclei of interest, including cross-sections and angular distributions, is achieved through the triple-coincidence measurement. In addition, the correction from Doppler effect of the {\gamma}-ray energies is improved by the detection of the light particles and the use of two-body kinematics and a full rejection of the background contributions is obtained through the identification of heavy residues. Moreover, the system can handle high intensity beams (up to 108 pps). The particle identification based on the measurement of the time-of-flight between MUGAST and VAMOS and the reconstruction of the trajectories is investigated.