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The behaviour of the i13 / 2 and h9 / 2 single-neutron strength was studied with the (α, 3He) reaction on 138Ba, 140Ce, 142Nd and 144Sm targets at a beam energy of 51 MeV. The separation between the single-neutron states i13 / 2 and h9 / 2 was measured in N = 83 nuclei with changing proton number. To this end spectroscopic factors for states populated in high-ℓ transfer were extracted from the data. Some mixing of ℓ = 5 and 6 strength was observed with states that are formed by coupling the f7 / 2 state to the 2+ and 3- vibrational states and the mixing matrix elements were found to be remarkably constant. The centroids of the strength indicate a systematic change in the energies of the i13 / 2 and h9 / 2 single-neutron states with increasing proton number that is in quantitative agreement with the effects expected from the tensor interaction. © 2007 Elsevier B.V. All rights reserved.

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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

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