Alpha-gamma decay studies of 261Sg and 257Rf

B. Streicher; F. P. Heßberger; S. Antalic; S. Hofmann; D. Ackermann; S. Heinz; B. Kindler; J. Khuyagbaatar; I. Kojouharov; P. Kuusiniemi; M. Leino; B. Lommel; R. Mann; Š. Šáro; B. Sulignano; J. Uusitalo; M. Venhart

doi:10.1140/epja/i2010-11005-2

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Hadrons and Nuclei

Eur. Phys. J. A (2010) 45: 275-286
https://doi.org/10.1140/epja/i2010-11005-2

Regular Article - Experimental Physics

Alpha-gamma decay studies of ²⁶¹Sg and ²⁵⁷Rf

B. Streicher¹^,2, F. P. Heßberger³, S. Antalic¹, S. Hofmann³^,4, D. Ackermann³, S. Heinz³, B. Kindler³, J. Khuyagbaatar³, I. Kojouharov³, P. Kuusiniemi³^,5, M. Leino⁶, B. Lommel³, R. Mann³, Š. Šáro¹, B. Sulignano³^,2^,a, J. Uusitalo⁶ and M. Venhart¹^,b

¹ Department of Nuclear Physics and Biophysics, Comenius University, 84248, Bratislava, Slovakia
² Institut für Kernchemie, Johannes Gutenberg-Universität, 55099, Mainz, Germany
³ GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany
⁴ Institut für Kernphysik, Goethe-Universität, 60054, Frankfurt am Main, Germany
⁵ CUPP, University of Oulu, 86801, Pyhäjärvi, Finland
⁶ University of Jyväskylä, 40014, Jyväskylä, Finland

Received: 7 April 2010
Revised: 10 May 2010
Accepted: 16 June 2010
Published online: 20 July 2010

Abstract

The isotope ²⁶¹Sg and its decay product ²⁵⁷Rf were produced in the nuclear reaction ²⁰⁸Pb(⁵⁴Cr, n)²⁶¹Sg . The radioactive decay of these isotopes was investigated by means of $\alpha$ , $\alpha$ - $\gamma$ and/or $\alpha$ -X-ray spectroscopy. Improved spectroscopic data concerning $\alpha$ energies, $\gamma$ transitions, tentative spin and parity assignments of low-lying Nilsson single-neutron orbitals are presented for these nuclei.