Excitation Functions for Proton-Induced Reactions with Copper

Proton bombardment at energies up to 100 Mev have been carried out in the Harvard University cyclotron using targets of Cu⁶³O and Cu⁶⁵O. Absolute cross sections of the ($p, n$), ($p, 2n$), (p, pn), and ($p, p2n$) reactions of Cu⁶³ and the ($p, 3n$), ($p, 4n$), (p, pn), ($p, p3n$), and ($p, p4n$) reactions of Cu⁶⁵ have been determined using the C¹²(p, pn)C¹¹ and Al²⁷(p, 3pn)Na²⁴ reactions to monitor the proton beam. An estimate of the ratio of level densities for odd-odd and even-even nuclei is made.