Low collectivity of the first 2+ states of 212,210Po

D. Kocheva, G. Rainovski, J. Jolie, N. Pietralla, A. Blazhev, A. Astier, R. Altenkirch, M. Bast, M. Beckers, S. Ansari, Th. Braunroth, M. Cappellazzo, M.l. Cortés, A. Dewald, F. Diel, M. Djongolov, C. Fransen, K. Gladnishki, A. Goldkuhle, A. HennigV. Karayonchev, J.M. Keatings, E. Kluge, Th. Kröll, J. Litzinger, K. Moschner, C. Müller-Gatermann, P. Petkov, M. Rudigier, M. Scheck, P. Spagnoletti, Ph. Scholz, T. Schmidt, M. Spieker, C. Stahl, R. Stegmann, A. Stolz, A. Vogt, M. Stoyanova, P. Thöle, N. Warr, V. Werner, W. Witt, D. Wölk, J.C. Zamora, K.O. Zell, P. Van Isacker, V.Yu. Ponomarev

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


The lifetimes of the first 2+ excited states of 212,210Po were measured in two transfer reactions 208Pb(12C,8Be)212Po and 208Pb(12C,10Be)210Po by the Recoil Distance Doppler Shift (RDDS) method and by the Doppler Shift Attenuation method (DSAM), respectively. The derived absolute B(E2) values of 2.6(3) W.u. for 212Po and 1.83(28) W.u. for 210Po indicate low collectivity. It is shown that the properties of the yrast 21+, 41+, 61+ and 81+ states in both nuclei cannot be described consistently in the framework of nuclear shell models. It is also demonstrated in the case of 210Po that Quasi-particle Phonon Model (QPM) calculations cannot overcome this problem thus indicating the existence of a peculiarity which is neglected in both theoretical approaches.
Original languageEnglish
Title of host publicationXXII International School on Nuclear Physics, Neutron Physics and Applications 10–16 September 2017, Varna, Bulgaria
PublisherIOP Publishing
Publication statusPublished - 1 May 2018

Publication series

NameJournal of Physics: Conference Series
PublisherIOP Publishing
ISSN (Print)1742-6588


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