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Low collectivity of the 2₁⁺ state of ²¹²Po

 
: Kocheva, Diana; Rainovski, Georgi; Jolie, Jan; Pietralla, Norbert; Blazhev, Andrey; Altenkirch, Richard; Ansari, Saba; Astier, Alain; Bast, Marcel; Beckers, Marcel; Braunroth, Thomas; Cappellazzo, Mario; 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; Scheck, Marcus; Scholz, Philipp; Schmidt, Tobias; Spagnoletti, Pietro; Stahl, Christian; Stegmann, Robert; Stolz, Alexander; Vogt, Andreas; Warr, Nigel; Werner, Volker; Wölk, Dorothea; Zamora, Juan Carlos; Zell, Karl Oskar; Ponomarev, Vladimir Yu.; Isacker, Piet van

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Physical Review. C 96 (2017), Nr.4, Art. 044305, 9 S.
ISSN: 0556-2813
Englisch
Zeitschriftenaufsatz
Fraunhofer INT ()

Abstract
The lifetime of the 2₁⁺ state of ²¹²Po was measured in the ²⁰⁸Pb(¹²C,⁸Be)²¹²Po transfer reaction by γ-ray spectroscopy employing the recoil distance Doppler shift (RDDS) method. The derived absolute B(E2) value of 2.6(3) W.u. indicates a low collectivity and contradicts previous claims of α-cluster components in the structure of the 2₁⁺ state. It is demonstrated that a consistent description of the properties of the 2₁⁺− 4₁⁺− 6₁⁺− 8₁⁺ sequence in ²¹²Po cannot be achieved in the framework of a single- j shell-model calculation, either. This puzzle is traced to the properties of the seniority-2 configurations in ²¹⁰Pb and ²¹⁰Po.

: http://publica.fraunhofer.de/dokumente/N-565107.html