Kamales Kar

Impact of the first SNO results on neutrino mass and mixing

Abstract We investigate the implications of the SNO charged-current (CC) and electron scattering (ES) measurements of solar 8 B neutrino fluxes for neutrino mass and mixing parameters by performing a global and unified χ 2 analysis of the solar neutrino data in the framework of two neutrino mixing. We consider both ν e – ν active and ν e – ν sterile solutions and perform (i) analysis of the total rates data of Cl, Ga, SK and SNO experiments and (ii) global analysis including the total rates data, the recoil electron spectrum data of SK and the CC spectrum observed at SNO. For the ν e – ν active case the inclusion of the SNO results in the analysis of the total rates reduces (enhances) the goodness-of-fit (GOF) of the SMA (LMA) solution. The flat spectrum observed at SK further favours the LMA solution over the SMA solution and no allowed area is obtained in the SMA region at 3 σ level from the global analysis. For the ν e – ν sterile case, with the inclusion of the SNO results, all the solutions are disfavoured with a probability of more than 99% from the total rates analysis while for the global analysis the GOF of these become much worse.

The effect of collective flavor oscillations on the diffuse supernova neutrino background

Collective flavor oscillations driven by neutrino-neutrino self interaction inside core-collapse supernovae have now been shown to bring drastic changes in the resultant neutrino fluxes. This would in turn significantly affect the diffuse supernova neutrino background (DSNB), created by all core-collapse supernovae that have exploded in the past. In view of these collective effects, we re-analyze the potential of detecting the DSNB in currently running and planned large-scale detectors meant for detecting both electron neutrinos and antineutrinos. The next generation detectors should be able to observe DSNB fluxes. Under certain conducive conditions, one could learn about neutrino parameters. For instance, it might be possible to determine the neutrino mass hierarchy, even if theta_{13} is almost zero.

Three generation neutrino oscillation parameters after SNO

We examine the solar neutrino problem in the context of the realistic three neutrino mixing scenario including the SNO charged current (CC) rate. The two independent mass squared differences

Collective flavor oscillations of supernova neutrinos and r-process nucleosynthesis

\Delta m^2_{21}

Accelerator, reactor and atmospheric neutrino data: a three-flavor oscillation analysis

and

Possible violation of the spin-statistics relation for neutrinos: Checking through future galactic supernova

\Delta m^2_{31} \approx \Delta m^2_{32}

Electron capture supernovae - One-zone collapse calculation for stars with masses 10 solar masses and 15 solar masses

are taken to be in the solar and atmospheric ranges respectively. We incorporate the constraints on

Observing supernova neutrino light curve in future dark matter detectors

\Delta

Statistical theory versus shell model in a large pf configuration space

m

HOW DEGENERATE CAN COSMOLOGICAL NEUTRINOS BE

^2_{31}