https://doi.org/10.1140/epja/s10050-020-00259-w
Regular Article – Experimental Physics
Experimental evidence for low-lying quadrupole isovector excitation of $$^{208}$$Po
1
Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164, Sofia, Bulgaria
2
Institut für Kernphysik, Universität zu Köln, 50937, Cologne, Germany
3
Institut für Kernphysik, Technische Universität Darmstadt, 64289, Darmstadt, Germany
4
Argonne National Laboratory, 9700 South Cass Ave, Argonne, IL, 60439, USA
5
CEPS, University of the West of Scotland, PA1 2BE Paisley, UK and SUPA, Glasgow, G12 8QQ, UK
* e-mail: dkocheva@phys.uni-sofia.bg
Received:
17
July
2020
Accepted:
20
September
2020
Published online:
2
October
2020
We present the results from an experiment dedicated to measure the lifetime of the $$2^+_2$$ state, candidate for the one-phonon mixed-symmetry state, of $$^{208}$$Po. This nucleus was studied in the $$\alpha $$-transfer reaction $$^{204}$$Pb($$^{12}$$C,$$^{8}$$Be)$$^{208}$$Po and the lifetime of the $$2^+_2$$ state was determined by utilizing the Doppler-shift attenuation method. The experimental data show that the $$2^+_2$$ state decays with a sizable M1 transition to the $$2^+_1$$ state revealing its isovector nature.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2020
