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Phys. Rev. Lett. 88, 012502 (2001) [4 pages]

Parity Measurements of Nuclear Levels Using a Free-Electron-Laser Generated γ-Ray Beam

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N. Pietralla1,2 and Z. Berant1,3
1A. W. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520
2Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany
3Department of Physics, Clark University, Worcester, Massachusetts 10610and Negev Research Center, Beer-Sheva, Israel 94170

V. N. Litvinenko, S. Hartman, F. F. Mikhailov, I. V. Pinayev, and G. Swift
Free Electron Laser Laboratory, Department of Physics, Duke University, Durham, North Carolina 27708

M. W. Ahmed, J. H. Kelley, S. O. Nelson, R. Prior, K. Sabourov, A. P. Tonchev, and H. R. Weller
Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina 27708

Received 18 July 2001; published 20 December 2001

The quality and intensity of γ rays at the High Intensity γ-ray Source are shown to make nuclear resonance fluorescence studies possible at a new level of precision and efficiency. First experiments have been carried out using an intense (107γ/s) beam of 100% linearly polarized, nearly monoenergetic, γ rays on the semimagic nucleus 138Ba. Negative parity quantum numbers have been assigned to 18 dipole excitations of 138Ba between 5.5 MeV and 6.5 MeV from azimuthal γ-intensity asymmetries.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.012502
DOI:
10.1103/PhysRevLett.88.012502
PACS:
21.10.Hw, 25.20.Dc, 27.60.+j, 41.60.Cr
 
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