Köln 2004 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 19: Nuclear Structure/Spectroscopy III
HK 19.7: Vortrag
Dienstag, 9. März 2004, 17:30–17:45, D
Parity assignments in 172,174,176Yb using polarized photons* — •D. Savran1, M.W. Ahmed2, M. Babilon1,3, J.H. Kelley4, J. Li5, S. Müller1, B. Perdue2, I. Pinaev5, A. Tonchev2, W. Tornow2, H.R. Weller2, Y. Wu5, and A. Zilges1 — 1Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany — 2Triangle Universities Nuclear Laboratory, Duke University, Durham, NC, USA — 3A. W. Wright Structure Laboratory, Yale University, New Haven, CT, USA — 4Triangle Universities Nuclear Laboratory, North Carolina State University, Raleigh, NC, USA — 5Free Electron Laser Laboratory, Department of Physics, Duke University, Durham, NC, USA
In previous (γ ,γ′) experiments using unpolarized
bremsstrahlung strong dipole transitions were observed in the rare-earth
nuclei 172,174,176Yb in the energy region between 2.5-3.5 MeV [1].
Most of the transitions are believed to belong to the M1 scissors mode,
which is strongly fragmented in these nuclei [2], however no parities have
been measured so far. We used the 100% linearly polarized Compton
backscattered γ-Ray Beam of the HIγS-facility at TUNL, which
has been shown to be very suitable for parity assignments of dipole
excitations [3].
* supported by the DFG (SFB 634), by the DAAD and U.S. DOE Grant No.
DE-FG02-97ER41033.
[1] A. Zilges et al., Nucl. Phys. A507, 399 (1990)
[2] U. Kneissl et al., Prog. Part. Nucl. Phys. 37, 349 (1996)
[3] N. Pietralla et al., Phys. Rev. Lett. 88, 1 (2002)