2019 Impact factor 2.176
Hadrons and Nuclei
Eur. Phys. J. A 6, 381-385

Short note

Alpha decay of the new isotopes 188,189Po

A.N. Andreyev1 - D. Ackermann2 - P. Cagarda3 - J. Gerl2 - F. He$\ss$berger2 - S. Hofmann2 - M. Huyse1 - A. Keenan4 - H. Kettunen5 - A. Kleinböhl2 - A. Lavrentiev6 - M. Leino5 - B. Lommel2 - M. Matos3 - G. Münzenberg2 - C. Moore4 - C.D. O'Leary4 - R.D. Page4 - S. Reshitko2 - S. Saro3 - C. Schlegel2 - H. Schaffner2 - M. Taylor4 - P. Van Duppen1 - L. Weissman1 - R. Wyss7

1 Instituut voor Kern- en Stralingsfysica, University of Leuven, Celestijnenlaan 200 D, 3001 Leuven, Belgium
2 Gesellschaft fur Schwerionenforschung Darmstadt, Postfach 110541, 6100 Darmstadt, Germany
3 Department of Nuclear Physics,Comenius University, Bratislava, Slovakia
4 Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK
5 Department of Physics, University of Jyväskylä, 40351 Jyväskylä, Finland
6 Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, 141980, Dubna, Russia
7 Department of Physics, Royal Institute of Technology, 104 05 Stockholm, Sweden

Received: 15 October 1999 Communicated by J. Äystö

Abstract
New neutron-deficient isotopes 188,189Po have been produced in the complete fusion reaction of 52Cr ions with a 142Nd target at the velocity filter SHIP. The evaporation residues were separated in-flight and subsequently identified on the basis of $\alpha-\gamma$ and $\alpha$-conversion electron coincidence measurements and of $\alpha$-$\alpha$ position and time correlations. In 189Po a ground state to ground state $\alpha$ decay with E $_{\alpha1}$=7540(20) keV, T1/2=5(1) ms and two fine structure $\alpha$-decays at E $_{\alpha2}$=7264(15) keV and E $_{\alpha3}$=7316(15) keV have been observed. In 188Po (T1/2=400 +200-150$\mu$s ) a ground state to ground state $\alpha$ decay at E$_{\alpha}$=7915(25) keV and a fine structure $\alpha$ decay at E$_{\alpha}$=7350(40) keV have been found. Improved data on the $\alpha$-decay of 189Bi were obtained.

PACS
23.60.+e $\alpha$ decay - 27.70.+q $150 \leq A \leq 189$ - 27.80.+w $190 \leq A \leq 219$


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