Studies of neutron-deficient mendelevium isotopes at SHIP

S. Antalic; F. P. Heßberger; S. Hofmann; D. Ackermann; S. Heinz; B. Kindler; I. Kojouharov; P. Kuusiniemi; M. Leino; B. Lommel; R. Mann; Š. Šáro

doi:10.1140/epja/i2009-10896-0

2022 Impact factor 2.7

Hadrons and Nuclei

Eur. Phys. J. A (2010) 43: 35-44
https://doi.org/10.1140/epja/i2009-10896-0

Regular Article - Experimental Physics

Studies of neutron-deficient mendelevium isotopes at SHIP

S. Antalic¹^*, F. P. Heßberger², S. Hofmann²^,3, D. Ackermann², S. Heinz², B. Kindler², I. Kojouharov², P. Kuusiniemi⁴, M. Leino⁵, B. Lommel², R. Mann² and Š. Šáro¹

¹ Department of Nuclear Physics and Biophysics, Comenius University, 84248, Bratislava, Slovakia
² GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany
³ Institut für Kernphysik, Goethe-Universität, 60054, Frankfurt am Main, Germany
⁴ Centre for Underground Physics in Pyhäsalmi (CUPP), University of Oulu, 90014, Oulu, Finland
⁵ Department of Physics, University of Jyväskylä, 40361, Jyväskylä, Finland

^* e-mail: Stanislav.Antalic@fmph.uniba.sk

Received: 17 September 2009
Revised: 27 October 2009
Accepted: 1 November 2009
Published online: 20 November 2009

Abstract

The radioactive decay of the isotopes ²⁴⁷Md , ²⁴⁶Md and their daughter products was investigated by means of - and - coincidence spectroscopy. The isotopes were produced using the fusion reaction ⁴⁰Ar$ + $²⁰⁹Bi. Decay schemes are suggested for ²⁴⁷Md and ²⁴³Es . A new isomeric state in ²⁴⁶Md with a half-life of ( 4.4±0.8 s was observed. Previous data of electron-capture delayed fission of ²⁴⁶Md and ²⁴²Es were confirmed. The probability for this decay branch in ²⁴⁶Md was measured to be P _ECDF > 0.10 . The probability for electron-capture delayed fission in the case of ²⁴²Es was determined to be P _ECDF = 0.013^+0.012 _-0.007 .