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Ito, Y; Schury, P; Wada, M; Arai, F; Haba, H; Hirayama, Y; Ishizawa, S; Kaji, D; Kimura, S; Koura, H; MacCormick, M; Miyatake, H; Moon, J Y; Morimoto, K; Morita, K; Mukai, M; Murray, I; Niwase, T; Okada, K; Ozawa, A; Rosenbusch, M; Takamine, A; Tanaka, T; Watanabe, Y X; Wollnik, H; Yamaki, S
Physical review letters, 2018-Apr-13, Letnik: 120, Številka: 15Journal Article
The masses of ^{246}Es, ^{251}Fm, and the transfermium nuclei ^{249-252}Md and ^{254}No, produced by hot- and cold-fusion reactions, in the vicinity of the deformed N=152 neutron shell closure, have been directly measured using a multireflection time-of-flight mass spectrograph. The masses of ^{246}Es and ^{249,250,252}Md were measured for the first time. Using the masses of ^{249,250}Md as anchor points for α decay chains, the masses of heavier nuclei, up to ^{261}Bh and ^{266}Mt, were determined. These new masses were compared with theoretical global mass models and demonstrated to be in good agreement with macroscopic-microscopic models in this region. The empirical shell gap parameter δ_{2n} derived from three isotopic masses was updated with the new masses and corroborates the existence of the deformed N=152 neutron shell closure for Md and Lr.
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in: SICRIS
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