Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....4.1371k&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
2
Scientific paper
As a completion of our previous results at 3.66 GeV/n, we present new data from the experiment in which 12 C beam fragmentation on liquid hydrogen has been studied. The experiment was performed at the Dubna Synchrophasotron at projectile energies 1.87 and 2.69 GeV per nucleon, using the magnetic spectrometer ANOMALON. The isotopic and elemental cross sections of the 12 C fragmentation have been obtained. Our results are compared with semi-empirical (Silberberg and Tsao) and parametric model (Webber, Kish and Schrier) predictions. 1. Introduction The task to measure fragmentation cross sections of 12 C and 16 O on hydrogen has been undertaken by the Polish-Russian collaboration some years ago. It was to provide more (and hopefully - better) data for studies of cosmic ray propagation in the Galaxy. The energy region around 2 GeV/n is particularly important as it is there that the ratio of secondary to primary cosmic ray nuclei (e.g. boron to carbon) starts to decrease with energy. Thus, the good knowledge about the energy dependence of fragmentation cross sections of primaries (such as 12 C and 16 O) in this energy region is necessary to draw sensible conclusions about the behaviour of the cosmic ray escape path length. The first part of our results (12 C fragmentation at 3.66 GeV/n) has been already published (Korejwo et al., 1999 and 2000). Here we present the results for two remaining energies - 1.87 and 2.69 GeV/n. 2. Experiment The experiment has been performed using the Anomalon set-up (Zarubin et al., 1993; Borzunov et al., 1997) at the Synchrophasotron's slow extraction beam VP-1 (Joint Institute for Nuclear Research in Dubna, Russia). Layout of the spectrometer is nearly the same as in our measurements of isotopic cross sections at 3.66 GeV/n. Some changes of the location of detectors have been done in order to optimise the measurement conditions. The principal components of Anomalon magnetic spectrometer (Fig. 1) are, first of all, a system of multiwire proportional chambers (MWPC) and an analysing magnet SP-40. The spectrometer also includes a Cherenkov hodoscope for determination of fragment charges, a trigger system consisting of scintillation and Cherenkov counters, and a beam monitor. The target consists of a 0.94 g cm-2 liquid hydrogen contained in a mylar tube with total wall thickness of 0.067 g cm-2 . The chambers and the liquid hydrogen target have been designed and produced at JINR. The multiwire proportional chambers constitute a coordinate detector destined for determining track parameters. The chambers in the first group (MWPC 1 - 3) Fig. 1. Layout of the spectrometer. MWPC 1 - 10: multiwire proportional chambers, S1 - S3: scintillation counters, ýI, ýII, ý1 - ý32: Cherenkov counters, T: liquid hydrogen target, SP-40: analysing magnet.
Dzikowski T.
Giller Maria
Korejwo A.
Perelygin V. V.
Zarubin A. V.
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