  A search for squarks and gluinos in final states containing jets, missing
transverse momentum and no high-pT electrons or muons is presented. The data
represent the complete sample recorded in 2011 by the ATLAS experiment in 7 TeV
proton-proton collisions at the Large Hadron Collider, with a total integrated
luminosity of 4.7 fb^-1. No excess above the Standard Model background
expectation is observed. Gluino masses below 860 GeV and squark masses below
1320 GeV are excluded at the 95% confidence level in simplified models
containing only squarks of the first two generations, a gluino octet and a
massless neutralino, for squark or gluino masses below 2 TeV, respectively.
Squarks and gluinos with equal masses below 1410 GeV are excluded. In
MSUGRA/CMSSM models with tan beta = 10, A_0 = 0 and mu > 0, squarks and gluinos
of equal mass are excluded for masses below 1360 GeV. Constraints are also
placed on the parameter space of SUSY models with compressed spectra. These
limits considerably extend the region of supersymmetric parameter space
excluded by previous measurements with the ATLAS detector.
