Coulomb Excitation of the K p =5 - 242m Am Isomer (t 1/2 =141 y). CCFP 2006. A. B. Hayes and D. Cline University of Rochester, Dept. of Physics and Astronomy, Rochester, NY U.S.A. J. J. Carroll, D. Gohlke, R. Propri, and R. Wheeler Youngstown State University, Youngstown, OH U.S.A.
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A. B. Hayes and D. Cline
University of Rochester, Dept. of Physics and Astronomy, Rochester, NY U.S.A.
J. J. Carroll, D. Gohlke, R. Propri, and R. Wheeler
Youngstown State University, Youngstown, OH U.S.A.
S. A. Karamian
Joint Institute for Nuclear Research, Dubna, Russia
J. A. Becker, R. A. Macri, K. J. Moody, and C. Y. Wu
Lawrence Livermore National Laboratory, Livermore, CA U.S.A.
M. P. Carpenter, J. P. Greene, A. A. Hecht, R. V. F. Janssens, T. Lauritsen, C. J. Lister, D. Seweryniak, X. Wang, and S. Zhu
Argonne National Laboratory, Argonne, IL U.S.A.
A. O. Macchiavelli
Lawrence Berkeley National Laboratory, Berkeley, CA U.S.A.
U. Rochester—A. B. Hayes, D. Cline, C. Y. Wu, H. Hua, M. W. Simon, R. Teng ANL—R. V. F. Janssens, C. J. Lister, E. F. Moore, R. C. Pardo, D. Sewereniak LBNL—A. O. Macchiavelli, K. Vetter GSI—J. Gerl, Ch. Schlegel, H. J. Wollersheim Warsaw University—P. Napiorkowski, J. Srebrny WNSL, Yale University—J. Ai, H. Amro, C. Beausang, R. F. Casten, A. A. Hecht, A. Heinz, R. Hughes, D. A. Meyer
Extended 178Hf level scheme, measured matrix elements coupling low-K bands to K=4+,6+,8- bands
Fit a set of GSB16+ band matrix elements from combined data of experiments 1 and 2
Previous Rochester Work: 178Hf Level SchemeNew levels and isomer states in bold
Interpretation of 178Hf Data
Publications PRL 89, 242501 (2002)
PRL 96, 042505 (2006)
Constant moments of inertia
Align at much higher spin
Highly hindered transitions between high-spin, high-K states
K is good in high-K bands
Rapid loss of hindrance with increasing spin
Up-bends in the moments of inertia suggest mixing
Total breakdown of
I≈12 in low-K bands
Results are consistent with collective alignment effects.
Expect similar behavior in other deformed nuclei.
Coulomb Excitation of the Kp=5-242mAm Isomer (t1/2=141 y)
Gammasphere Single -ray Spectrum
Measured Partial WidthsIncluding internal conversion
243Am(D,T)242Am Grotdal et al., Physica Scripta 14, 263 (1976)
Unidentified 99 keV and 171 keV states
Known StructuresNew levels are shown in bold.Previously known levels from Salicio et al., Phys. Rev. C 37, 2371 (1988).
Known K=3- DecaysNew levels are shown in bold.Transitions with thin arrows from Salicio et al.Unconnected levels were not observed.
This work was supported by:
Measured Gyromagnetic Ratiosfrom measured partial widths
Known Rotational Bands in 242AmSalicio et al., Phys. Rev. C 37, 2371 (1988)