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Isomer decay spectroscopy of Sm-164 and Gd-166: midshell collectivity around N=100.

Patel, Z*; Soderstrom, P A*; Podolyak, Z*; Regan, P H; Walker, P M*; Watanabe, H*; Ideguchi, E*; Simpson, G S*; Liu, H L*; Nishimura, S*; Wu, Q*; Xu, F R*; Browne, F*; Doornenbal, P*; Lorusso, G*; Rice, S*; Sinclair, L*; Sumikama, T*; Wu, J*; Xu, Z Y*; Aoi, N*; Baba, H*; Garrote, F L B*; Benzoni, G*; Daido, R*; Fang, Y*; Fukuda, N*; Gey, G*; Go, S*; Gottardo, A*; Inabe, N*; Isobe, T*; Kameda, D*; Kobayashi, K*; Komatsubara, T*; Kojouharov, I*; Kubo, T*; Kurz, N*; Kuti, I*; Li, Z*; Matsushita, M*; Michimasa, S*; Moon, C B*; Nishibata, H*; Nishizuka, I*; Odahara, A*; Sahin, E*; Sakurai, H*; Schaffner, H*; Suzuki, H*; Takeda, H*; Tanaka, M*; Taprogge, J*; Vajta, Z*; Yagi, A*; Yokoyama, R* (2014) Isomer decay spectroscopy of Sm-164 and Gd-166: midshell collectivity around N=100. Phys. Rev. Lett., 113 (26). 262502

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Abstract

Excited states in the N=102 isotones 166Gd and 164Sm have been observed following isomeric decay for the first time at RIBF, RIKEN. The half-lives of the isomeric states have been measured to be 950(60) and 600(140)ns for 166Gd and 164Sm repsectively. Based on the decay scheme patterns and potential energy surface calculations, including beta_6 defornation, a spin and parity of 6- has been assigned to the isomeric state s in both nuclei. Collective observables are discussed in light of the systematics of the region, giving insight into nuclear shape evolutrion. The decrease in the ground-band enegries of 166Gd and 164Sm (N=102) compared to 164GHd and 162Sm (N=100) respectively presents evidence for the predicted deformed shell gap closure at N=100.

Item Type: Article
Keywords: gamma-ray spectroscopy, nuclear decay data, nuclear isomerism, beta_6 deformation, nuclear mean-field models
Subjects: Ionising Radiation
Ionising Radiation > Radioactivity
Identification number/DOI: 10.1103/PhysRevLett.113.262502
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/6512

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