The Euroschool on Exotic Beams - Vol. 5 by Christoph Scheidenberger & Marek Pfützner

Author:Christoph Scheidenberger & Marek Pfützner
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

In the case of hydrogen isotopes, the time-of-flight measurement is used to calculate the velocity, β, of each of the track candidates. The correlation of β vs. P/Z provides the identification of proton, deuteron and triton species. π − mesons are also identified with this correlation obtained from the time-of-flight measurement by the TFW detector. Figure 4.24 shows those correlations for the positively charged particles (left panel) and the negatively charged particles (right panel). The species of hydrogen isotopes and π −meson should be distributed around the theoretical function of , where m and p respectively are the mass of the species of interest and the reconstructed momentum. Each theoretical line is indicated by a solid line in Fig. 4.24. Each hydrogen species is identified by falling into the mass interval of ± 15% from the nominal mass of the species of interest. In the left panel of Fig. 4.24, the selection bands used for the identification are indicated by dashed lines, and can be observed in the correlation plot. The identification of π − mesons is achieved in a manner similar to hydrogen isotopes by using the time-of-flight information at the TFW wall. The right panel of Fig. 4.24 shows the corresponding correlation of β vs. P/Z, and the selection of π − mesons is made by defining a band of ± 0.05 in β around the theoretical line.

Fig. 4.24Correlation between the velocity β and the momentum for the Z = 1 charge isotopes (left panel) and the π − meson (right panel). The theoretical function is drawn as a black line for each hydrogen isotope (proton, deuteron and triton) and the π − meson. Selection bands for the particle identification are drawn as dashed lines for each species of interest. The figure is taken from [39]

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