Odd-mass gadolinium isotopes around N = 90 were populated by the (p,d) reaction, utilizing 25-MeV protons, resulting in population of low-spin quasineutron states at energies near and below the Fermi surface. Systematics of the single quasineutron levels populated are presented. A large excitation energy gap is observed between levels originating from the 2d3/2, 1h11/2, and 3s1/2 spherical parents (above the N = 64 gap), and the 2d5/2 (below the gap), indicating that the spherical shell model level spacing is maintained at least to moderate deformations.
Copyright © 2013 The American Physical Society. This article first appeared in Physical Review C 88, no. 3 (September 3, 2013): 031301: 1-31301: 4. doi:10.1103/PhysRevC.88.031301.
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Ross, T. J., R. O. Hughes, C. W. Beausang, J. M. Allmond, C. T. Angell, M. S. Basunia, D. L. Bleuel, J. T. Burke, R. J. Casperson, J. E. Escher, P. Fallon, R. Hatarik, J. Munson, S. Paschalis, M. Petri, L. W. Phair, J. J. Ressler, and N. D. Scielzo. "Remnants of Spherical Shell Structures in Deformed Nuclei: The Impact of an N = 64 Neutron Subshell Closure on the Structure of N ≈ 90 Gadolinium Nuclei." Physical Review C 88, no. 3 (September 3, 2013): 031301: 1-31301: 4. doi:10.1103/PhysRevC.88.031301.