Alpha decay of the new isotopes $^{188,189}$Po

A.N. Andreyev - et al.

doi:doi:10.1007/s100500050359

2021 Impact factor 3.131

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, T_1/2=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 (T_1/2=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.