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Superdeformed and Triaxial States in ^{42}Ca.
Phys Rev Lett
August 2016
Institute of Nuclear Physics, Polish Academy of Sciences, PL 31-342 Kraków, Poland.
Shape parameters of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in ^{42}Ca were determined from E2 matrix elements measured in the first low-energy Coulomb excitation experiment performed with AGATA. The picture of two coexisting structures is well reproduced by new state-of-the-art large-scale shell model and beyond-mean-field calculations. Experimental evidence for superdeformation of the band built on 0_{2}^{+} has been obtained and the role of triaxiality in the A∼40 mass region is discussed.
View Article and Find Full Text PDFProbing the order-to-chaos region in superdeformed 151Tb and 196Pb nuclei with continuum gamma transitions.
Phys Rev Lett
October 2008
Dipartimento di Fisica and INFN, Sezione di Milano,Via Celoria 16, 20133 Milano, Italy.
The gamma decay associated with the warm rotation of the superdeformed nuclei 151Tb and 196Pb has been measured with the EUROBALL IV array. Several independent quantities provide a stringent test of the population and decay dynamics in the superdeformed well. A Monte Carlo simulation of the gamma decay based on microscopic calculations gives remarkable agreement with the data only assuming a large enhancement of the B(E1) strength for 1-2 MeV gamma rays, which may be related to the evidence for octupole vibrations in both mass regions.
View Article and Find Full Text PDFExcitation energies of superdeformed States in 196Pb: towards a systematic study of the second well in Pb isotopes.
Phys Rev Lett
October 2005
Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia.
The excitation energy of the lowest-energy superdeformed band in 196Pb is established using the techniques of time-correlated gamma-ray spectroscopy. Together with previous measurements on 192Pb and 194Pb, this result allows superdeformed excitation energies, binding energies, and two-proton and two-neutron separation energies to be studied systematically, providing stringent tests for current nuclear models. The results are examined for evidence of a "superdeformed shell gap.
View Article and Find Full Text PDFDirect decay from the superdeformed band to the yrast line in 15266Dy86.
Phys Rev Lett
January 2002
Argonne National Laboratory, Argonne, Illinois 60439, USA.
The excitation energy, spin, and parity of the yrast superdeformed band in 152Dy have been firmly established. The evidence comes mainly from the measured properties of a 4011 keV single-step transition connecting the yrast superdeformed level fed by the 693 keV transition to the 27- yrast state. Four additional, weaker, linking gamma rays have been placed as well.
View Article and Find Full Text PDFEmpirical investigation of extreme single-particle behavior of nuclear quadrupole moments in highly collective A approximately 150 superdeformed bands.
Phys Rev Lett
October 2001
Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045, USA.
The intrinsic quadrupole moment Q(0) of superdeformed rotational bands in A approximately 150 nuclei depends on the associated single-particle configuration. We have derived an empirical formula based on the additivity of effective quadrupole moments of single-particle orbitals that describes existing measurements from (142)Sm to (152)Dy. To further test the formula, the predicted Q(0) moments for two superdeformed bands in (146)Gd of 14.
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