Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 905, Issue -, Pages 138-148Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2018.07.053
Keywords
Time Projection Chamber; Tracking software; Hough transform; Spectroscopy of exotic nuclei
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Funding
- European Research Council through the ERC Starting Grant [MINOS-258567]
- IPA program at the RIKEN Nishina Center
- Japanese Society for the Promotion of Science (JSPS) [L-13520]
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We report on the performance of the MINOS Time Projection Chamber developed as a vertex tracker to study exotic nuclei produced from hydrogen-induced knockout via in-beam gamma-ray and invariant-mass spectroscopy. Inbeam measurements with He-4 and Ne-20 beams at 200 and 350 MeV/nucleon, respectively, were performed at the HIMAC facility. The tracking algorithm for protons after quasi-free scattering is described. Realistic simulations and physics experiments are compared and show a good agreement. The vertex position resolution reaches 5 mm FWHM, mostly from re-scattering with the target and the Aluminum reaction chamber. The overall efficiency of vertex reconstruction is also benchmarked with the first experimental campaign data performed at the RIBF, confirming an overall efficiency better than 90% for physics experiments.
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