Alpha- and EC-decay measurements of 257Rf

F. P. Heßberger; S. Antalic; A. K. Mistry; D. Ackermann; B. Andel; M. Block; Z. Kalaninova; B. Kindler; I. Kojouharov; M. Laatiaoui; B. Lommel; J. Piot; M. Vostinar

doi:10.1140/epja/i2016-16192-0

2022 Impact factor 2.7

Hadrons and Nuclei

Eur. Phys. J. A (2016) 52: 192
https://doi.org/10.1140/epja/i2016-16192-0

Regular Article - Experimental Physics

Alpha- and EC-decay measurements of ²⁵⁷Rf

F. P. Heßberger¹^,2^*, S. Antalic³, A. K. Mistry²^,1, D. Ackermann¹, B. Andel³, M. Block¹^,2^,4, Z. Kalaninova³, B. Kindler¹, I. Kojouharov¹, M. Laatiaoui²^,1, B. Lommel¹, J. Piot⁵ and M. Vostinar⁵

¹ GSI - Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany
² Helmholtz Institut Mainz, 55099, Mainz, Germany
³ Department of Nuclear Physics and Biophysics, Comenius University in Bratislava, 84248, Bratislava, Slovakia
⁴ Johannes Gutenberg-Universität Mainz, 55128, Mainz, Germany
⁵ GANIL, 14076, Caen Cedex 5, France

^* e-mail: F.P.Hessberger@gsi.de

Received: 11 April 2016
Accepted: 14 June 2016
Published online: 20 July 2016

Abstract

Alpha- and Electron capture (EC) decay properties of ²⁵⁷ Rf were investigated by measuring - coincidences and correlations between conversion electrons (CE) emitted during the process of EC decay of ²⁵⁷Rf and decays of the daughter isotope ²⁵⁷Lr. So far, previously unobserved (8296 keV)- (557 keV) coincidences were measured and interpreted as decays of ^257mRf ( into the level in ²⁵³No. A search of delayed coincidences between particles and signals at keV, which are interpreted as being due to CE emission, revealed a clear correlation between CE and particles from the decay of ²⁵⁷Lr, which is regarded as a direct proof of the EC decay of ^257gRf and ^257mRf.