Isomeric states in 253No

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

doi:10.1140/epja/i2007-10391-8

EPJ

Isomeric states in ²⁵³No

A. Lopez-Martens¹^*, K. Hauschild¹, A. V. Yeremin², O. Dorvaux³, A. V. Belozerov², Ch. Briançon¹, M. L. Chelnokov², V. I. Chepigin², D. Curien³, P. Désesquelles⁴^,1, B. Gall³, V. A. Gorshkov², M. Guttormsen⁵, F. Hanappe⁶, A. P. Kabachenko², F. Khalfallah³, A. Korichi¹, A. C. Larsen⁵, O. N. Malyshev², A. Minkova⁷^,8, Yu. Ts. Oganessian², A. G. Popeko², M. Rousseau³, N. Rowley³, R. N. Sagaidak², S. Sharo⁹, A. V. Shutov², S. Siem⁵, L. Stuttgé³, A. I. Svirikhin², N. U. H. Syed⁵ and Ch. Theisen¹⁰

¹ CSNSM, IN2P3-CNRS, UMR8609, F-91405, France
² FLNR, JINR, Dubna, Russia
³ IPHC-DRS, ULP, IN2P3-CNRS, F-67037, Strasbourg, France
⁴ Université Paris-Sud, F-91405, Orsay, France
⁵ Department of Physics, Oslo University, 0316, Oslo, Norway
⁶ Université Libre de Bruxelles, 1050, Bruxelles, Belgium
⁷ Faculty of Physics, University of Sofia, 1164, Sofia, Bulgaria
⁸ INRNE, BAS, Sofia, Bulgaria
⁹ Department of Physics, Comenius University, SK-84215, Bratislava, Slovakia
¹⁰ CEA-Saclay, DSM/DAPNIA/SPhN, 91191, Gif-sur-Yvette, France

Received: 2 March 2007
Accepted: 30 May 2007
Published online: 12 June 2007

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.

PACS: 21.10.-k Properties of nuclei; nuclear energy levels – / 21.10.Tg Lifetimes – / 23.20.Lv γ transitions and level energies – / 23.20.Nx Internal conversion and extranuclear effects –

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Isomeric states in 253No

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Isomeric states in ²⁵³No