Prompt photon production in √sNN=2.76-TeV Pb+Pb collisions has been measured by the ATLAS experiment at the Large Hadron Collider using data collected in 2011 with an integrated luminosity of 0.14 nb−1. Inclusive photon yields, scaled by the mean nuclear thickness function, are presented as a function of collision centrality and transverse momentum in two pseudorapidity intervals, |η|<1.37 and 1.52≤|η|<2.37. The scaled yields in the two pseudorapidity intervals, as well as the ratios of the forward yields to those at midrapidity, are compared to the expectations from next-to-leading-order perturbative QCD (pQCD) calculations. The measured cross sections agree well with the predictions for proton-proton collisions within statistical and systematic uncertainties. Both the yields and the ratios are also compared to two other pQCD calculations, one which uses the isospin content appropriate to colliding lead nuclei and another which includes nuclear modifications to the nucleon parton distribution functions.1 MoreReceived 30 June 2015Revised 22 January 2016DOI:https://doi.org/10.1103/PhysRevC.93.034914This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.©2016 CERN, for the ATLAS CollaborationPhysics Subject Headings (PhySH)Photon, lepton & quark productionResearch AreasRelativistic heavy-ion collisionsPhoton, lepton & quark productionResearch AreasHard scatteringPhoton, lepton & quark productionRelativistic heavy-ion collisionsNuclear Physics