3,644 research outputs found
Small Quadrupole Deformation for the Dipole Bands in 112In
High spin states in In were investigated using Mo(O,
p3n) reaction at 80 MeV. The excited level have been observed up to 5.6 MeV
excitation energy and spin 20 with the level scheme showing three
dipole bands. The polarization and lifetime measurements were carried out for
the dipole bands. Tilted axis cranking model calculations were performed for
different quasi-particle configurations of this doubly odd nucleus. Comparison
of the calculations of the model with the B(M1) transition strengths of the
positive and negative parity bands firmly established their configurations.Comment: 10 pages, 11 figures, 2 table
Onset of deformation at in Bi nuclei
The high spin states in Bi has been studied by -ray
spectroscopic method using the Ta(Ne, 6n) fusion evaporation
reaction at 130 MeV. The coincidence data were taken using an
array of 8 clover HPGe detectors. The spin and parity assignments of the
excited states have been made from the measured directional correlation from
oriented states (DCO) ratios and integrated polarization asymmetry (IPDCO)
ratios. The results show, for the first time, the evidence of a rotational like
band based on a 13/2 band head in this nucleus, indicating the onset of
deformation at neutron number for the Bismuth isotopes. The results
obtained were found to be consistent with the prediction of the total Routhian
surface calculations using Woods Saxon potential. The same calculations also
predict a change in shape from oblate to triaxial in Bi at high
rotational frequency
Shell model study of the pairing correlations
A systematic study of the pairing correlations as a function of temperature
and angular momentum has been performed in the sd-shell region using the
spherical shell model approach. The pairing correlations have been derived for
even-even, even-odd and odd-odd systems near N=Z and also for the asymmetric
case of N=Z+4. The results indicate that the pairing content and the behavior
of pair correlations is similar in even-even and odd-mass nuclei. For odd-odd
N=Z system, angular momentum I=0 state is an isospin, t=1 neutron-proton paired
configuration. Further, these t=1 correlations are shown to be dramatically
reduced for the asymmetric case of N=Z+4. The shell model results obtained are
qualitatively explained within a simplified degenerate model
Re-entrant spin glass and magnetoresistance in Co_{0.2}Zn_{0.8}Fe_{1.6}Ti_{0.4}O_4 spinel oxide
We have investigated the static and dynamic response of magnetic clusters in
Co_{0.2}Zn_{0.8}Fe_{1.6}Ti_{0.4}O_4 spinel oxide, where a sequence of magnetic
phase transitions, i.e., paramagnetic (PM) to ferromagnetic at T_{C}
270K and ferromagnetic to canted spin glass state at T_f\leq$ 125K is
observed
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