Lifetimes and magnetic moments of two states in62Cu

Abstract

The lifetimes and the magnetic moments of the two excited 62Cu states at 40.84 and 390.19 keV are investigated by time differential perturbed angular distribution measurements of the delayed y-rays following the nuclear reactions 61Ni(d, n) and 62Ni (p, n). The results are: r=6.7_ 0.5 nsec,/t= 1.32_ 0.03 n. m. for the 2 + state at 40.84 keV, and T= 16.0_ 0.3 nsec,/t=2.00+ 0.01 n. m. for the 3 + state at 390.19 keV.

The 68m Cu/ 68 Cu isotope as a new probe for hyperfine studies: The nuclear moments

“…As reference, one has the magnetic hyperfine field obtained in [30] B hf = −4.7(1) T at 4 K. This value was then rescaled to 105 K using the magnetization saturation curve of [31], obtaining B hf = −4.6(1) T. A final extrapolation of the hyperfine magnetic field was performed to 304 K using the time differential perturbed angular distribution (TDPAD) measurements for 62 Cu in Ni [32]. From that work the magnetic frequencies, at 105 K and 304 K, were graphically extracted, ω L = 153.8( 17 From the two independent crosscheck experiments using cobalt (μ = 2.859(13) μ N ) and nickel (μ = 2.804(85) μ N ) hosts, the average (error weighted) value of μ = 2.857(6) μ N has been adopted.…”

Gamma-ray spectroscopy of62Cu

“…It seems that the 1,142 keV 7-ray, formerly attributed [7] to the transition from this level to the ground state, would belong rather to a cascade from a higher lying level (Jongsma [8], Chouraqui [2]). We observe a 469.4 keV y-ray in coincidence with E~ =40.8, 243.4, 284.9, 431.6 keV, all related to the 675.1 keV level decay, and a 753.8 keV ray in coincidence with E~=40.8 and 349.4 keV, related to the 390.2 keV level decay.…”