Measuring centrality with slow protons in proton-nucleus collisions at 18 GeV/c

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 journalArticle

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Abstract

Experiment E910 has measured slow protons and deuterons from collisions of 18 GeV/c 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 N grey and the mean number of interactions v(N grey) is studied using several simple models, one newly proposed, as well as the RQMD event generator. RQMD is shown to reproduce the N grey distribution, and exhibits a dependence of N grey on centrality that is similar to the behavior of the simple models. We find a strong linear dependence of N grey on v, with a constant of proportionality that varies with target. For the Au target, we report a relative systematic error for extracting v(N grey) that lies between 10 and 20% over all N grey.

Original languageEnglish
Article number024902
Pages (from-to)249021-2490212
Number of pages2241192
JournalPhysical Review C - Nuclear Physics
Volume60
Issue number2
Publication statusPublished - 1999 Aug

Fingerprint

nuclei
collisions
protons
systematic errors
emulsions
deuterons
projectiles
generators
angular distribution
interactions
momentum

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Chemakin, I., Cianciolo, V., Cole, B. A., Fernow, R., Frawley, A., Gilkes, M., ... Zhang, Y. (1999). Measuring centrality with slow protons in proton-nucleus collisions at 18 GeV/c. Physical Review C - Nuclear Physics, 60(2), 249021-2490212. [024902].
Chemakin, I. ; Cianciolo, V. ; Cole, B. A. ; Fernow, R. ; Frawley, A. ; Gilkes, M. ; Gushue, S. ; Hartouni, E. P. ; Hiejima, H. ; Justice, M. ; Kang, J. H. ; Kirk, H. ; Maeda, N. ; McGrath, R. L. ; Mioduszewski, S. ; Morrison, D. ; Moulson, M. ; Namboodiri, M. N. ; Rai, G. ; Read, K. ; Remsberg, L. ; Rosati, M. ; Shin, Y. ; Soltz, R. A. ; Sorensen, S. ; Thomas, J. ; Torun, Y. ; Winter, D. ; Yang, X. ; Zajc, W. A. ; Zhang, Y. / Measuring centrality with slow protons in proton-nucleus collisions at 18 GeV/c. In: Physical Review C - Nuclear Physics. 1999 ; Vol. 60, No. 2. pp. 249021-2490212.
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title = "Measuring centrality with slow protons in proton-nucleus collisions at 18 GeV/c",
abstract = "Experiment E910 has measured slow protons and deuterons from collisions of 18 GeV/c 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 N grey and the mean number of interactions v(N grey) is studied using several simple models, one newly proposed, as well as the RQMD event generator. RQMD is shown to reproduce the N grey distribution, and exhibits a dependence of N grey on centrality that is similar to the behavior of the simple models. We find a strong linear dependence of N grey on v, with a constant of proportionality that varies with target. For the Au target, we report a relative systematic error for extracting v(N grey) that lies between 10 and 20{\%} over all N grey.",
author = "I. Chemakin and V. Cianciolo and Cole, {B. A.} and R. Fernow and A. Frawley and M. Gilkes and S. Gushue and Hartouni, {E. P.} and H. Hiejima and M. Justice and Kang, {J. H.} and H. Kirk and N. Maeda and McGrath, {R. L.} and S. Mioduszewski and D. Morrison and M. Moulson and Namboodiri, {M. N.} and G. Rai and K. Read and L. Remsberg and M. Rosati and Y. Shin and Soltz, {R. A.} and S. Sorensen and J. Thomas and Y. Torun and D. Winter and X. Yang and Zajc, {W. A.} and Y. Zhang",
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Chemakin, I, Cianciolo, V, Cole, BA, Fernow, R, Frawley, A, Gilkes, M, Gushue, S, Hartouni, EP, Hiejima, H, Justice, M, Kang, JH, Kirk, H, Maeda, N, McGrath, RL, Mioduszewski, S, Morrison, D, Moulson, M, Namboodiri, MN, Rai, G, Read, K, Remsberg, L, Rosati, M, Shin, Y, Soltz, RA, Sorensen, S, Thomas, J, Torun, Y, Winter, D, Yang, X, Zajc, WA & Zhang, Y 1999, 'Measuring centrality with slow protons in proton-nucleus collisions at 18 GeV/c', Physical Review C - Nuclear Physics, vol. 60, no. 2, 024902, pp. 249021-2490212.

Measuring centrality with slow protons in proton-nucleus collisions at 18 GeV/c. / Chemakin, I.; Cianciolo, V.; Cole, B. A.; Fernow, R.; Frawley, A.; Gilkes, M.; Gushue, S.; Hartouni, E. P.; Hiejima, H.; Justice, M.; Kang, J. H.; Kirk, H.; Maeda, N.; McGrath, R. L.; Mioduszewski, S.; Morrison, D.; Moulson, M.; Namboodiri, M. N.; Rai, G.; Read, K.; Remsberg, L.; Rosati, M.; Shin, Y.; Soltz, R. A.; Sorensen, S.; Thomas, J.; Torun, Y.; Winter, D.; Yang, X.; Zajc, W. A.; Zhang, Y.

In: Physical Review C - Nuclear Physics, Vol. 60, No. 2, 024902, 08.1999, p. 249021-2490212.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Measuring centrality with slow protons in proton-nucleus collisions at 18 GeV/c

AU - Chemakin, I.

AU - Cianciolo, V.

AU - Cole, B. A.

AU - Fernow, R.

AU - Frawley, A.

AU - Gilkes, M.

AU - Gushue, S.

AU - Hartouni, E. P.

AU - Hiejima, H.

AU - Justice, M.

AU - Kang, J. H.

AU - Kirk, H.

AU - Maeda, N.

AU - McGrath, R. L.

AU - Mioduszewski, S.

AU - Morrison, D.

AU - Moulson, M.

AU - Namboodiri, M. N.

AU - Rai, G.

AU - Read, K.

AU - Remsberg, L.

AU - Rosati, M.

AU - Shin, Y.

AU - Soltz, R. A.

AU - Sorensen, S.

AU - Thomas, J.

AU - Torun, Y.

AU - Winter, D.

AU - Yang, X.

AU - Zajc, W. A.

AU - Zhang, Y.

PY - 1999/8

Y1 - 1999/8

N2 - Experiment E910 has measured slow protons and deuterons from collisions of 18 GeV/c 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 N grey and the mean number of interactions v(N grey) is studied using several simple models, one newly proposed, as well as the RQMD event generator. RQMD is shown to reproduce the N grey distribution, and exhibits a dependence of N grey on centrality that is similar to the behavior of the simple models. We find a strong linear dependence of N grey on v, with a constant of proportionality that varies with target. For the Au target, we report a relative systematic error for extracting v(N grey) that lies between 10 and 20% over all N grey.

AB - Experiment E910 has measured slow protons and deuterons from collisions of 18 GeV/c 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 N grey and the mean number of interactions v(N grey) is studied using several simple models, one newly proposed, as well as the RQMD event generator. RQMD is shown to reproduce the N grey distribution, and exhibits a dependence of N grey on centrality that is similar to the behavior of the simple models. We find a strong linear dependence of N grey on v, with a constant of proportionality that varies with target. For the Au target, we report a relative systematic error for extracting v(N grey) that lies between 10 and 20% over all N grey.

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Chemakin I, Cianciolo V, Cole BA, Fernow R, Frawley A, Gilkes M et al. Measuring centrality with slow protons in proton-nucleus collisions at 18 GeV/c. Physical Review C - Nuclear Physics. 1999 Aug;60(2):249021-2490212. 024902.