Experimental identification of spin-parities and single-particle configurations in 257No and its alpha-decay daughter 253Fm.
Physical review letters(2005)
Abstract
alpha-gamma and alpha-electron coincidence spectroscopy for a short-lived heavy actinide nucleus (257)No (T(1/2) = 24.5 s) has been performed using a gas-jet transport system and an on-line isotope separator. Spin-parities of excited states in (253)Fm fed by the alpha decay of (257)No have been identified on the basis of the measured internal conversion coefficients. The nu3/2(+)[622] configuration has been assigned to the ground state of (257)No as well as to the 124.1 keV level in (253)Fm. It was found that the ground-state configuration of (257)No is different from that of lighter N = 155 isotones.
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Key words
in<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml,spin-parities,single-particle
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