15,317 research outputs found
Excited bands in odd-mass rare-earth nuclei
Normal parity bands are studied in 157Gd, 163Dy and 169Tm using the pseudo
SU(3) shell model. Energies and B(E2) transition strengths of states belonging
to six low-lying rotational bands with the same parity in each nuclei are
presented. The pseudo SU(3) basis includes states with pseudo-spin 0 and 1, and
1/2 and 3/2, for even and odd number of nucleons, respectively. States with
pseudo-spin 1 and 3/2 must be included for a proper description of some excited
bands.Comment: 8 pages, 6 figures, Submitted to Phys. Rev.
Microscopic description of the scissors mode in odd-mass heavy deformed nuclei
Pseudo-SU(3) shell-model results are reported for M1 excitation strengths in
157-Gd, 163-Dy and 169-Tm in the energy range between 2 and 4 MeV. Non-zero
pseudo-spin couplings between the configurations play a very important role in
determining the M1 strength distribution, especially its rapidly changing
fragmentation pattern which differs significantly from what has been found in
neighboring even-even systems. The results suggest one should examine
contributions from intruder levels.Comment: 5 pages, 3 figure
Pseudo + quasi SU(3): Towards a shell-model description of heavy deformed nuclei
The pseudo-SU(3) model has been extensively used to study normal parity bands
in even-even and odd-mass heavy deformed nuclei. The use of a realistic
Hamiltonian that mixes many SU(3) irreps has allowed for a successful
description of energy spectra and electromagnetic transition strengths. While
this model is powerful, there are situations in which the intruder states must
be taken into account explicitly. The quasi-SU(3) symmetry is expected to
complement the model, allowing for a description of nucleons occupying normal
and intruder parity orbitals using a unified formalism.Comment: 9 pages, 2 figures, invited talk at Computational and Group
Theoretical Methods in Nuclear Physics, Playa del Carmen, Mexico, February
18-21, 200
Inter-band B(E2) transition strengths in odd-mass heavy deformed nuclei
Inter-band B(E2) transition strengths between different normal parity bands
in 163Dy and 165Er are described using the pseudo-SU(3) model. The Hamiltonian
includes Nilsson single-particle energies, quadrupole-quadrupole and pairing
interactions with fixed, parametrized strengths, and three extra rotor terms
used to fine tune the energy spectra. In addition to inter-band transitions,
the energy spectra and the ground state intra-band B(E2) strengths are
reported. The results show the pseudo-SU(3) shell model to be a powerful
microscopic theory for a description of the normal parity sector in heavy
deformed odd-A nuclei.Comment: 4 figures, 2 table
Estudio médico-tanatológico de la momia del Cerro Nevado del Chuscha
Fil: Mazziotti, Gerardo E..
Mendoza. Cuerpo Médico ForenseFil: Vargas, Armando P..
Mendoza. Cuerpo Médico Forens
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