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

: Kocheva, Diana; Rainovski, Georgi; Jolie, Jan; Pietralla, Norbert; Blazhev, Andrey; Astier, Alain; Altenkirch, Richard; Bast, Marcel; Beckers, Marcel; Ansari, Saba; Braunroth, Thomas; Cappellazzo, Mario; Cortés, Martha Liliana; Dewald, Alfred; Diel, Felix; Djongolov, Martin; Fransen, Christoph; Gladnishki, Kalin; Goldkuhle, Alina; Hennig, Andreas; Karayonchev, Vasil; Keatings, James Michael; Kluge, Eschly; Kröll, Thorsten; Litzinger, Julia; Moschner, Kevin; Müller-Gatermann, Claus; Petkov, Pavel; Rudigier, Matthias; Scheck, Marcus; Spagnoletti, Pietro; Scholz, Philipp; Schmidt, Tobias; Spieker, Mark; Stahl, Christian; Stegmann, Robert; Stolz, Alexander; Stoyanova, Milena; Thöle, Pierre; Warr, Nigel; Werner, Volker; Witt, Waldemar; Wölk, Dorothea; Zamora, Juan Carlos; Zell, Karl Oskar; Isacker, Piet van; Ponomarev, Vladimir Yu.


Tonev, D. ; Institute of Physics -IOP-, London:
XXII International School on Nuclear Physics, Neutron Physics and Applications 2017 : 10-16 September 2017, Varna, Bulgaria
Bristol: IOP Publishing, 2018 (Journal of physics. Conference series 1023)
ISBN: 978-1-5108-6323-1
Art. 012019, 9 S.
International School on Nuclear Physics, Neutron Physics and Applications <22, 2017, Varna>
Fraunhofer INT ()

The lifetimes of the first 2⁺ excited states of ²¹²Po,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.