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Title: Participant and spectator scaling of spectator fragments in Au + Au and Cu + Cu collisions at sNN=19.6 and 22.4 GeV

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=19.6 GeV) 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. In this paper, 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. Finally, 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.
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Publication Date:
Report Number(s):
BNL-113371-2016-JA
Journal ID: ISSN 2469-9985
Grant/Contract Number:
AC02-98CH10886; AC02-06CH11357; FG02-93ER40802; FG02-94ER40818; FG02-94ER40865; FG02-99ER41099; 9603486; 0072204; 0245011; DEC-2013/08/M/ST2/00320; NSC 89-2112-M-008-024; F 049823
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 94; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
APS
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); Polish National Science Centre (NCN); National Science Council of Taiwan (NSC); Hungarian Scientific Research Fund (OTKA) (Hungary)
Contributing Orgs:
PHOBOS Collaboration
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Relativistic Heavy Ion Collider
OSTI Identifier:
1341649
Alternate Identifier(s):
OSTI ID: 1280209