ar X iv : a st ro - p h / 04 10 73 9 v 1 2 9 O ct 2 00 4 On the primary particle type of the most energetic Fly ’ s Eye event

ar X iv : a st ro - p h / 04 01 62 9 v 2 5 A pr 2 00 4 Primary Particle Type of the Most Energetic Fly ’ s Eye Air Shower

The longitudinal profile of the most energetic cosmic-ray air shower measured so far, the event recorded by the Fly’s Eye detector with a reconstructed primary energy of about 3.2 · 10 eV, is compared to simulated shower profiles. The calculations are performed with the CORSIKA code and include primary photons and different hadron primaries. For primary photons, preshower formation in the geoma...

ar X iv : a st ro - p h / 04 04 21 8 v 2 5 O ct 2 00 4 Prospect of determining the Dirac / Majorana state of neutrino by Multi - OWL experiment

We consider the non-radiative two body decay of a neutrino to a daughter neutrino with degraded energy and a very light particle (Majoron). Ultrahigh energy neutrinos from an astrophysical source like a Gamma Ray Burst undergoing this decay process are found to produce different number of events in the detector depending on whether they are Majorana or Dirac particles. The next generation large...

ar X iv : a st ro - p h / 06 10 24 6 v 1 9 O ct 2 00 6 Special Features of Galactic Dynamics

ar X iv : a st ro - p h / 04 10 65 7 v 1 27 O ct 2 00 4 Detection of the linear radical HC 4 N in IRC + 10216

We report the detection of the linear radical HC 4

ar X iv : a st ro - p h / 04 10 27 5 v 1 1 1 O ct 2 00 4 SN 1987 A : The Unusual Explosion of a Normal Type II

I review the unwrapping story the SN 1987A explosion event, and the main discoveries associated with it. I will show that, although this supernova is somewhat peculiar, the study of SN 1987A has clarified quite a number of important aspects of the nature and the properties of supernovae in general.