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

Journal Article · · Physical Review C
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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 ( s N N = 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.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); Polish National Science Centre (NCN); National Science Council of Taiwan (NSC); Hungarian Scientific Research Fund (OTKA) (Hungary)
Contributing Organization:
PHOBOS Collaboration
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
OSTI ID:
1341649
Alternate ID(s):
OSTI ID: 1280209
Report Number(s):
BNL-113371-2016-JA; TRN: US1701748
Journal Information:
Physical Review C, Vol. 94, Issue 2; ISSN 2469-9985
Publisher:
APSCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

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Figures / Tables (26)

FIG. 1(p. 4)figure FIG. 1
FIG. 2(p. 5)figure FIG. 2
FIG. 3(p. 6)figure FIG. 3
FIG. 4(p. 7)figure FIG. 4
FIG. 5(p. 8)figure FIG. 5
FIG. 6(p. 10)figure FIG. 6
FIG. 7(p. 10)figure FIG. 7
FIG. 8(p. 10)figure FIG. 8
FIG. 9(p. 11)figure FIG. 9
FIG. 10(p. 12)figure FIG. 10
FIG. 11(p. 13)figure FIG. 11
FIG. 12(p. 13)figure FIG. 12
FIG. 13(p. 13)figure FIG. 13
FIG. 14(p. 14)figure FIG. 14
FIG. 15(p. 14)figure FIG. 15
FIG. 16(p. 14)figure FIG. 16
FIG. 17(p. 16)figure FIG. 17
FIG. 18(p. 17)figure FIG. 18
FIG. 19(p. 17)figure FIG. 19
TABLE I(p. 17)table TABLE I
TABLE II(p. 18)table TABLE II
TABLE III(p. 18)table TABLE III
TABLE IV(p. 18)table TABLE IV
TABLE V(p. 18)table TABLE V
TABLE VI(p. 19)table TABLE VI
TABLE VII(p. 19)table TABLE VII

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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