1,961 research outputs found
The Triaxial Rotation Vibration Model in the Xe-Ba Region
The axial Rotation Vibration Model is here extended to describe also triaxial
equilibrium shapes with beta and gamma vibrations allowing for the interaction
between vibrations and rotations. This Triaxial Rotation Vibration Model (TRVM)
is applied to Xe and Ba isotopes with mass numbers between 120 and 130. This
area has recently been pointed out to be the O(6) limit of the Interacting
Boson Approximation (IBA). The present work shows that the TRVM can equally
well describe these nuclei concerning their excitation energies and E2
branching ratios.Comment: 11 pages, 2 figure
Description of even-even triaxial Nuclei within the Coherent State and the Triaxial Rotation-Vibration Models
The coherent state model (CSM) and the triaxial rotation-vibration model
(TRVM) are alternatively used to describe the ground, gamma and beta bands of
228Th. CSM is also applied to the nuclei 126Xe and 130Ba, which were recently
considered in TRVM. The two models are compared with respect to both their
underlying assumptions and to their predicted results for energy levels and E2
branching ratios. Both models describe energies and quadrupole transitions of
228Th equally well and in good agreement with experiment, if the 0 level
at 1120 keV is interpreted as the head of the beta band. The other two 0
levels at 832 and 939 keV are most likely not of a pure quadrupole vibration
nature as has already been pointed out in the literature.Comment: 31 pages, RevTeX, 6 figure
Perspectives of Nuclear Physics
The organizers of this meeting have asked me to present perspectives of
nuclear physics. This means to identify the areas where nuclear physics will be
expanding in the next future. In six chapters a short overview of these areas
will be given, where I expect that nuclear physics willdevelop quite fast: A.
Quantum Chromodynamics and effective field theories in the confinement region;
B. Nuclear structure at the limits; C. High energy heavy ion collisions; D.
Nuclear astrophysics; E. Neutrino physics; F. Test of physics beyond the
standard model by rare processes. After a survey over these six points I will
pick out a few topics where I will go more in details. There is no time to give
for all six points detailed examples. I shall discuss the following examples of
the six topics mentionned above: 1. The perturbative chiral quark model and the
nucleon -term, 2. VAMPIR (Variation After Mean field Projection In
Realistic model spaces and with realistic forces) as an example of the nuclear
structure renaissance, 3. Measurement of important astrophysical nuclear
reactions in the Gamow peak, 4. The solar neutrino problem. As examples for
testing new physics beyond the standard model by rare processes I had prepared
to speak about the measurement of the electric neutron dipole moment and of the
neutrinoless double beta decay. But the time is limited and so I have to skip
these points, although they are extremely interesting.Comment: 27 pages. Invited talk given at the ``IX Cortona meeting on problems
in theoretical nuclear physics", Cortona, Italy, October 9-12, 200
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