Spectroscopy of Gd and Gd using the () reaction

Ross, T. J.*; Hughes, R. O.*; Allmond, J. M.*; Beausang, C. W.*; Angell, C.; Basunia, M. S.*; Bleuel, D. L.*; Hurke, J. T.*; Casperson, R. J.*; Escher, J. E.*; et al.

Physical Review C, 90(4), p.044323_1 - 044323_12, 2014/10

https://doi.org/10.1103/PhysRevC.90.044323

Low-spin single quasi neutron levels in Gd and Gd have been studied following the Gd () Gd and Gd () Gd reactions. A combined Si telescope and high-purity germanium array was utilized, allowing - and -- coincidence measurements. Almost all of the established low-excitation-energy, low-spin structures were confirmed in both Gd and Gd. Several new levels and numerous new rays are observed in both nuclei, particularly for 1 MeV. Residual effects of a neutron sub shell closure at = 64 are observed in the form of a large excitation energy gap in the single quasi neutron level schemes.