High-j single-particle neutron states outside the N = 82 core
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.
Publication Source (Journal or Book title)
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Kay, B., Freeman, S., Schiffer, J., Clark, J., Deibel, C., Heinz, A., Parikh, A., & Wrede, C. (2008). High-j single-particle neutron states outside the N = 82 core. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 658 (5), 216-221. https://doi.org/10.1016/j.physletb.2007.11.033