Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of Neutrons in 11.5 A GeV/c Au+Pb Heavy Ion Collisions   We present measurements from Brookhaven Experiment 864 of neutron invariant
multiplicity in 11.5 A GeV/c Au+Pb collisions. The measurements span a rapidity
range from center-of-mass to beam rapidity (y(beam)=3.2) and are presented as a
function of event centrality. The results are compared with E864 measurements
of proton invariant multiplicity and an average n/p ratio at hadronic
freeze-out of 1.19+-.08 is determined for the rapidity range y=1.6 to y=2.4. We
discuss briefly the implications of this ratio within a simple equilibrium
model of the collision system.

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The categories of this paper are: cond-mat
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The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: math
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The categories of this paper are: nucl-th
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: physics