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Electric Monopole Transition from the Superdeformed Band in ^{40}Ca.
Phys Rev Lett
June 2022
Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra ACT 2601, Australia.
The electric monopole (E0) transition strength ρ^{2} for the transition connecting the third 0^{+} level, a "superdeformed" band head, to the "spherical" 0^{+} ground state in doubly magic ^{40}Ca is determined via e^{+}e^{-} pair-conversion spectroscopy. The measured value ρ^{2}(E0;0_{3}^{+}→0_{1}^{+})=2.3(5)×10^{-3} is the smallest ρ^{2}(E0;0^{+}→0^{+}) found in A<50 nuclei.
View Article and Find Full Text PDFSuperdeformed 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 PDFCoexistence of covalent superdeformation and molecular resonances in an unbound region of 12Be.
Phys Rev Lett
May 2008
RIKEN Nishina Center for Accelerator-Based Science, RIKEN, Wako, 351-0198, Saitama, Japan.
The generalized two-center cluster model, which can treat static structures and dynamical reactions in excited states, is applied to the light neutron-rich system, 12Be=alpha+alpha+4N. We discuss the change of the neutrons' configuration around two alpha cores from the covalent structure to the ionic one. We show that, in the unbound region above particle-decay thresholds, the ionic configurations appear as the molecular resonances of alpha+8He, 6He+6He, and 5He+7He.
View Article and Find Full Text PDFMotional narrowing and ergodic bands in excited superdeformed states of 194Hg.
Phys Rev Lett
March 2008
C.S.N.S.M, IN2P3-CNRS, Batiment 104-108, 91405 Orsay, France.
The E(gamma) - E(gamma) coincidence spectra from the electromagnetic decay of excited superdeformed states in (194)Hg reveal surprisingly narrow ridges, parallel to the diagonal. A total of 100-150 excited bands are found to contribute to these ridges, which account for nearly all the unresolved E2 decay strength. Comparison with theory suggests that these excited bands have many components in their wave functions, yet they display remarkable rotational coherence.
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.
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