Participant and spectator scaling of spectator fragments in Au + Au and Cu + Cu collisions at √sNN = 19.6 and 22.4 GeV
Name
PhysRevC.94.024903.pdf
Size
1.2 MB
Format
Adobe PDF
Checksum (MD5)
ed9924d89d27884da1c0bf81eac80e2a
Author(s)
Back, B. B.
Baker, M. D.
Barton, D. S.
Betts, R. R.
Bickley, A. A.
Bindel, R.
Budzanowski, A.
Carroll, A.
Chai, Z.
Chetluru, V.
Date Issued
August 2016
Journal
Physical Review C
Publisher
American Physical Society
Citation
Alver, B. et al. “Participant and Spectator Scaling of Spectator Fragments in Au + Au and Cu + Cu Collisions at √SNN = 19.6 and 22.4 GeV.” Physical Review C 94.2 (2016): n. pag. © 2016 American Physical Society
Version
Final published version
Abstract
Spectator fragments resulting from relativistic heavy ion collisions, consisting of single protons and neutrons along with groups of stable nuclear fragments up to nitrogen (Z=7), are measured in PHOBOS. These fragments are observed in Au+Au (√sNN =19.6GeV) and Cu+Cu (22.4 GeV) collisions at high pseudorapidity (η). The dominant multiply-charged fragment is the tightly bound helium (α), with lithium, beryllium, and boron all clearly seen as a function of collision centrality and pseudorapidity. We observe that in Cu+Cu collisions, it becomes much more favorable for the α fragments to be released than lithium. The yields of fragments approximately scale with the number of spectator nucleons, independent of the colliding ion. The shapes of the pseudorapidity distributions of fragments indicate that the average deflection of the fragments away from the beam direction increases for more central collisions. A detailed comparison of the shapes for α and lithium fragments indicates that the centrality dependence of the deflections favors a scaling with the number of participants in the collision.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevC.94.024903
