Identification of a K isomer in 252No

B. Sulignano; S. Heinz; F. P. Heßberger; S. Hofmann; D. Ackermann; S. Antalic; B. Kindler; I. Kojouharov; P. Kuusiniemi; B. Lommel; R. Mann; K. Nishio; A. G. Popeko; S. Saro; B. Streicher; M. Venhart; A. V. Yeremin

doi:10.1140/epja/i2007-10469-3

EPJ

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2023 Impact factor 2.6

Hadrons and Nuclei

Eur. Phys. J. A (2007) 33: 327-331
https://doi.org/10.1140/epja/i2007-10469-3

Regular Article - Experimental Physics

Identification of a K isomer in ²⁵²No

B. Sulignano¹, S. Heinz¹, F. P. Heßberger¹, S. Hofmann¹^,2, D. Ackermann¹, S. Antalic³, B. Kindler¹, I. Kojouharov¹, P. Kuusiniemi⁴, B. Lommel¹, R. Mann¹, K. Nishio⁵, A. G. Popeko⁶, S. Saro³, B. Streicher³, M. Venhart³ and A. V. Yeremin⁶

¹ Gesellschaft für Schwerionenforschung (GSI), D-64291, Darmstadt, Germany
² Institut für Physik, Johann Wolfgang Goethe-Universität Frankfurt, D-60054, Frankfurt, Germany
³ Department of Nuclear Physics and Biophysics, Comenius University Bratislava, SK-84248, Bratislava, Slovakia
⁴ CUPP, University of Oulu, FIN-90014, Oulu, Finland
⁵ Japan Atomic Energy Agency (JAEA), 319-1195, Tokai,Ibaraki, Japan
⁶ Flerov Laboratory of Nuclear Reactions, JINR, RUS-141890, Dubna, Russia

Received: 17 August 2007
Accepted: 28 August 2007
Published online: 13 September 2007

Abstract

A K isomer with a half-life of (110±10) ms at an excitation energy of 1254keV has been identified in the nucleus ²⁵²No . The isomer is interpreted as a two-quasineutron state with K ^π = 8^- . The isotope ²⁵²No was produced in the fusion-evaporation reaction ²⁰⁶Pb(⁴⁸Ca, 2n)²⁵²No . The experiment has been performed at the velocity filter SHIP of GSI Darmstadt.

PACS: 29.30.Kv X- and γ -ray spectroscopy – / 27.90.+b 220 ⩽ A – / 23.20.Lv γ transitions and level energies –

© Società Italiana di Fisica and Springer-Verlag, 2007