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We have performed a systematic study of the evolution of the superconductingand normal state properties of neutron irradiated MgB$_2$ wire segments as afunction of fluence and post exposure annealing temperature and time. Allfluences used suppressed the transition temperature, Tc, below 5 K and expandedthe unit cell. For each annealing temperature Tc recovers with annealing timeand the upper critical field, Hc2(T=0), approximately scales with Tc. Byjudicious choice of fluence, annealing temperature and time, the Tc of damagedMgB2 can be tuned to virtually any value between 5 and 39 K. For higherannealing temperatures and longer annealing times the recovery of Tc tends tocoincide with a decrease in the normal state resistivity and a systematicrecovery of the lattice parameters.Comment: Updated version, to appear in Phys. Rev.

physical review. b, condensed matter and materials physics

Systematic study of the superconducting and normal-state properties of neutron-irradiated<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>MgB</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Systematic study of the superconducting and normal-state properties of neutron-irradiatedMgB2