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Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 32: Structure and Dynamics of Nuclei V

HK 32.4: Talk

Wednesday, March 29, 2017, 17:45–18:00, F 33

Saturation of B(E2)-strength near mid-shell? Lifetimes of 174,176,178,180Hf. — •Johannes Wiederhold1, Ralph Kern1, Volker Werner1,4, Norbert Pietralla1, Nicu Marginean2, Raluca Marginean2, Cristina R. Nita2, Sorin Pascu2, Dorel Bucurescu2, Dan M. Filipescu2, Nicoleta Florea2, Dan G. Ghita2, Constantin Mihai2, Razvan Lica2, Patrick Regan3, Robert Carroll3, Terver Daniel3, Laila Gurgi3, Ralitsa Ilieva3,4, Nathan Cooper4, and Farheen Naqvi41IKP, TU-Darmstadt — 2IFIN-HH, Bucharest — 3Physics Department at Surrey — 4Yale University

Deformed nuclei in the rare earth region should show a saturation of the B(E2;01+→21+)-transition strength near mid-shell. Recent measurements of lifetimes of W-isotopes show discrepancies to literature values and seem to maximize the B(E2)-strength off mid-shell. An analog investigation is done on Hf-isotopes. Several lifetimes of excited states of the even-even isotopes 174,176,178,180Hf have been measured with fast electronic scintillation timing (FEST) using the same experimental setup to minimize systematic deviations among the values. Excited States were populated via Coulomb excitation (180Hf) and via β+-decay following fusion-evaporation reactions (174,176,178Hf) at the 9 MV tandem accelerator of the IFIN-HH near Bucharest. Obtained lifetimes of the Hf-isotopes will be presented. This work was supported by the DFG under Grants No. SFB 634 and No. SFB 1245, the U.S. DOE Grant No. DE-FG02-91ER40609 and the BMBF under the grant 05P15RDFN9 within the collaboration 05P15 NuSTAR R&D.

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