Low collectivity of the 21+ state of ²¹²Po

Autor: 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
Přispěvatelé: Publica
Jazyk: angličtina
Rok vydání: 2017
Popis: The lifetime of the 21+ state of ²¹²Po was measured in the ²08Pb(¹²C,8Be)²¹²Po transfer reaction by g-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 a-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.
Databáze: OpenAIRE