Elsevier

Nuclear Physics A

Volume 268, Issue 2, 14 September 1976, Pages 257-292
Nuclear Physics A

Proton states in 59Cu and structure of the 59Cu-59Ni analog pair

https://doi.org/10.1016/0375-9474(76)90462-0Get rights and content

Abstract

The 58Ni(τ, d) stripping reaction has been studied at 25 MeV incident energy for 59Cu levels located above the proton threshold with a split-pole spectrometer. Seventy-four states between 3.8 and 9.0 MeV excitation energy were observed in 59Cu. The main components of the 2p32, 2p12, 1f52, 1g92 and 2d52 analog states of 59Ni levels were identified. Angular distributions of transitions to 67 unbound levels in 59Cu have been extracted and analysed with DWBA and Gamow functions as form factors to yield absolute spectroscopic strength. The 58Ni(τ, dp̃) was performed at 24 MeV incident energy. The angular distributions of the emitted protons were measured in coincidence using method II of Litherland and Ferguson with 0° detection of deuteron groups. Spins, population parameters and branching ratios of proton partial widths to the ground and excited states of the target were determined from the analysis of the angular correlation data. The results of these two experiments provide a large number of spectroscopic properties of proton states in 59Cu and in particular of analog levels of 59Ni low-lying states. The p32, g92 and d52 IAS are observed to be fragmented into at least two individual levels. The summed spectroscopic factors and the centroid energies of the proton states in 59Cu are obtained. A comparison is made with the previous (τ, d), (p, γ), (p, p) and (d, p) results on the same target. The amplitudes of neutron coupling to the first 2+ excited state in 58Ni are also determined for the g92 and d52 isobaric analog states in 59Cu.

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