# Performance of the improved larger acceptance spectrometer: VAMOS++

Abstract : Measurements and ion optic calculations showed that the large momentum acceptance of the VAMOS spectrometer at GANIL could be further increased from $\sim$ 11% to $\sim$ 30% by suitably enlarging the dimensions of the detectors used at the focal plane. Such a new detection system built for the focal plane of VAMOS is described. It consists of larger area detectors (1000 mm × 150 mm) namely, a Multi-Wire Parallel Plate Avalanche Counter (MWPPAC), two drift chambers, a segmented ionization chamber and an array of Si detectors. Compared to the earlier existing system (VAMOS), we show that the new system (VAMOS++) has a dispersion-independent momentum acceptance . Additionally a start detector (MWPPAC) has been introduced near the target to further improve the mass resolution to $\sim$ 1/220. The performance of the VAMOS++ spectrometer is demonstrated using measurements of residues formed in the collisions of 129Xe at 967 MeV on 197Au.
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Journal articles

Cited literature [4 references]

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Submitted on : Monday, July 4, 2011 - 3:11:44 PM
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M. Rejmund, B. Lecornu, A. Navin, C. Schmitt, S. Damoy, et al.. Performance of the improved larger acceptance spectrometer: VAMOS++. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2011, 646, pp.184-191. ⟨10.1016/j.nima.2011.05.007⟩. ⟨in2p3-00592318⟩

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