Dual Position Sensitive MWPC for tracking reaction products at VAMOS++

TL;DR

This paper reports on the development and performance of a dual position sensitive MWPC detector used in VAMOS++ for precise measurement of reaction product trajectories, improving gamma-ray energy correction.

Contribution

The paper introduces a dual position sensitive MWPC with enhanced timing and spatial resolution for reaction product tracking in VAMOS++, enabling better Doppler correction.

Findings

Time-of-flight resolution of 305 ps achieved

Position resolutions of 2.5 mrad and 560 μm demonstrated

Improved gamma-ray energy correction in coincidence measurements

Abstract

The characteristics and performance of a Dual Position Sensitive Multi-Wire Proportional Counter (DPS-MWPC) used to measure the scattering angle, interaction position on the target and the velocity of reaction products, detected in the VAMOS++ magnetic spectrometer, are reported. The detector consists of a pair of position sensitive low pressure MWPCs and provides both fast timing signals, along with the two-dimensional position coordinates required to define the trajectory of the reaction products. A time-of-flight resolution of 305(11) ps (FWHM) was measured. The measured resolutions (FWHM) were 2.5(3) mrad and 560(70) {\mu}m for the scattering angle and the interaction point at the target respectively. The subsequent improvement of the Doppler correction of the energy of the gamma-rays, detected in the gamma-ray tracking array AGATA in coincidence with isotopically identified ions in VAMOS++, is also discussed.