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Forward calorimetry in the PHOBOS detector has been used to study chargedhadron production in d+Au, p+Au and n+Au collisions at sqrt(s_nn) = 200 GeV.The forward proton calorimeter detectors are described and a procedure fordetermining collision centrality with these detectors is detailed. Thedeposition of energy by deuteron spectator nucleons in the forward calorimetersis used to identify p+Au and n+Au collisions in the data. A weightedcombination of the yield of p+Au and n+Au is constructed to build a referencefor Au+Au collisions that better matches the isospin composition of the goldnucleus. The p_T and centrality dependence of the yield of this improvedreference system is found to match that of d+Au. The shape of the chargedparticle transverse momentum distribution is observed to extrapolate smoothlyfrom pbar+p to central d+Au as a function of the charged particlepseudorapidity density. The asymmetry of positively- and negatively-chargedhadron production in p+Au is compared to that of n+Au. No significant asymmetryis observed at mid-rapidity. These studies augment recent results fromexperiments at the LHC and RHIC facilities to give a more complete descriptionof particle production in p+A and d+A collisions, essential for theunderstanding the medium produced in high energy nucleus-nucleus collisions.

Nucleon-Gold Collisions at 200 AGeV Using Tagged d+Au Interactions in PHOBOS