Gamma transitions in 60Ni following the β+ decay of 60Cu

doi:10.1016/0375-9474(69)90525-9

Nuclear Physics A

Volume 124, Issue 1, 3 February 1969, Pages 145-164

https://doi.org/10.1016/0375-9474(69)90525-9 Get rights and content

Abstract

The γ-transitions in ⁶⁰Ni following the decay of ⁶⁰Cu have been investigated using a Ge(Li)NaI(Tl) coincidence-anticoincedence spectrometer. More than 20 previously unreported γ-transitions were observed, and six additional levels at 4007.8, 4318.8, 4760.7, 4843, (4848) and (5046) keV were found to be directly populated. A new 120.5+−0.3 keV branch (3.5%) between the 3₁⁺ (2626.2 keV) and the 4₁⁺ (2505.7 keV) states has been identified; it accounts for the major part of the M1 decay of the 3₁⁺ state. The branching of the 3124.1 keV 2₃⁺ state to the 0₁⁺ ground state and to the 2284.9 keV 0₂⁺ state yields B(E2: 2₃⁺ → 0₂⁺)/B(E2: 2₃⁺ → 0₁⁺) = 68+−7. On the basis of available evidence, we tentatively assign J^π = 2⁺ to the 3269.4 and 3393.5 keV levels.

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The Doppler shift attenuation technique was used to investigate the lifetimes of 33 states of ⁶⁰Ni up to 5.6 MeV of excitation; 18 were measured for the first time. Gamma rays from the ⁶⁰Ni(p,p′ψ) reaction were observed in coincidence with protons by two Ge(Li) detectors at 40° and 130° lab. We find a new doublet (3.381–3.393 MeV) and give several previously unknown ψ-ray branching ratios; the lifetimes allow one to attribute some spins or parities or to reject other assignments. In order to complement the existing information on ⁶⁰Ni, we have studied the proton configuration by the ⁵⁹Co(³He,dψ) reaction. The results are different from those expected from simple 1p-1h states of the proton core; many of the levels observed are multiplets decaying by cascades.

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^☆: Supported by the U.S. Air Force Office of Scientific Research and the National Science Foundation.

^††: Present address: Institut für Kernphysik, Universität Frankfurt/Main, Germany.

^†††: Present address: The Foster Radiation Laboratory, Mc Gill University, Montreal, Canada.

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Nuclear Physics A

Abstract

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Gamma transitions in 60Ni following the β+ decay of 60Cu☆

Abstract

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Phys. Rev.

Phys. Rev.

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Gamma transitions in ⁶⁰Ni following the β⁺ decay of ⁶⁰Cu☆