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Political Scenario in Bhutan during 1774-1906: An Impact Analysis on Trade and Commerce
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Reconstructing Nineteenth Century Trade Route between Bhutan and Assam: Evidences from British Political Missions
Neutrino Mass Matrices in Models with Horizontal Symmetries
We have studied the most general neutrino mass matrices in models with SU(2)
and SU(3) horizontal symmetries. Without going into the details of the models
it is possible to write down the effective operators, which predict the
structure of the Majorana neutrino mass matrices. Unlike other extensions of
the standard model, the structure is now independent of the effective Yukawa
couplings and depends entirely on the Higgs which gives mass to the other
fermions. In the case of SU(3) symmetries the lowest dimensional operators are
forbidden requiring a low mass scale for lepton number violation.Comment: 11 pages latex file, a few references added in 2nd versio
Centroids of Gamow-Teller transitions at finite temperature in fp-shell neutron-rich nuclei
The temperature dependence of the energy centroids and strength distributions
for Gamow-Teller (GT) excitations in several fp-shell nuclei is studied.
The quasiparticle random phase approximations (QRPA) is extended to describe GT
states at finite temperature. A shift to lower energies of the GT strength
is found, as compared to values obtained at zero temperature.Comment: 12 pages, contains 3 tables. E-mail: [email protected],
[email protected]
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