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

M. Vandebrouck (1) , A. Lemasson (1) , M. Rejmund (1) , G. Frémont (1) , J. Pancin (1) , A. Navin (1) , C. Michelagnoli (1) , J. Goupil (1) , C. Spitaels (1) , B. Jacquot (1)

1 GANIL - Grand Accélérateur National d'Ions Lourds

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.

Mots clés: Doppler correction; Tracking of heavy reaction products; VAMOS++; Low pressure Multi-Wire Proportional Counter (MWPC); Energies around the Coulomb barrier.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

M. Vandebrouck, A. Lemasson, M. Rejmund, G. Frémont, J. Pancin, et al.. Dual Position Sensitive MWPC for tracking reaction products at VAMOS++. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2016, 812, pp.112-117. ⟨10.1016/j.nima.2015.12.040⟩. ⟨in2p3-01250056⟩