Isomeric states in 253No

А Лопез-Мартенс ,O Dorvaux,D Curien,V I Chepigin,A G Popeko,F Khalfallah,A V Yeremin,S Sharo,V A Gorshkov,F Hanappe,M L Chelnokov,Ch Briançon,K Hauschild,A Minkova,R N Sagaidak,Ch Theisen,P Désesquelles,Yu Ts Oganessian,A I Svirikhin,M Guttormsen,M Rousseau,N Rowley,A V Belozerov,N U H Syed,B Gall,L Stuttgé,A Korichi,A Shutov ,A C Larsen,O N Malyshev,A.p Kabachenko ,S Siem

doi:10.1140/epja/i2007-10391-8

Abstract

Isomeric states in 253No have been investigated by conversion electron and γ -ray spectroscopy with the GABRIELA detection system. The 31μs isomer reported more than 30 years ago is found to decay to the ground state of 253No by the emission of a 167keV M2 transition. The spin and parity of this low-lying isomeric state are established to be 5/2+ . The presence of another longer-lived isomeric state is also discussed.

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