Measuring centrality with slow protons in proton-nucleus collisions at 18 GeV[Formula Presented]

I. Chemakin, V. Cianciolo, B. A. Cole, R. Fernow, A. Frawley, M. Gilkes, S. Gushue, E. P. Hartouni, H. Hiejima, M. Justice, J. H. Kang, H. Kirk, N. Maeda, R. L. McGrath, S. Mioduszewski, D. Morrison, M. Moulson, M. N. Namboodiri, G. Rai, K. ReadL. Remsberg, M. Rosati, Y. Shin, R. A. Soltz, S. Sorensen, J. Thomas, Y. Torun, D. Winter, X. Yang, W. A. Zajc, Y. Zhang

Research output: Contribution to journalArticlepeer-review


Experiment E910 has measured slow protons and deuterons from collisions of 18 [Formula Presented] protons with Be, Cu, and Au targets at the BNL AGS. These correspond to the “grey tracks” first observed in emulsion experiments. We report on their momentum and angular distributions and investigate their use in measuring the centrality of a collision, as defined by the mean number of projectile-nucleon interactions. The relation between the measured [Formula Presented] and the mean number of interactions [Formula Presented] is studied using several simple models, one newly proposed, as well as the RQMD event generator. RQMD is shown to reproduce the [Formula Presented] distribution, and exhibits a dependence of [Formula Presented] on centrality that is similar to the behavior of the simple models. We find a strong linear dependence of [Formula Presented] on [Formula Presented], with a constant of proportionality that varies with target. For the Au target, we report a relative systematic error for extracting [Formula Presented] that lies between 10 and 20 % over all [Formula Presented]

Original languageEnglish
Pages (from-to)12
Number of pages1
JournalPhysical Review C - Nuclear Physics
Issue number2
Publication statusPublished - 1999

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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