My CV(pdf file)      Publications List(pdf file)

Research  
Auger                            Pierre Auger Observatory
   (CLF)                                (Central Laser Facility)
C-RAYS                      Calibration by RaYleigh Scattering
HiRes                            High Resolution Fly's Eye
Some research tools      Links to some my projects

Selected Publications

Extracting first science results from the Pierre Auger Observatory, L. Wiencke for the Pierre Auger Collaboration., NIMA 572 p508 (2007)

A Measurement of Time-Averaged Aerosol Optical Depth using Air-Showers Observed in Stereo by HiRes, R. U. Abassi et al., Accepted for publication in Astrophys. J. (2006).

Techniques for Measuring Atmospheric Aerosols at the High Resolution Fly’s Eye Experiment, R. U. Abassi et al., Accepted for publication in Astrophys. J. (2005).

The Central Laser Facility at the Pierre Auger Observatory (astro-ph/0507334), F. Arqueros et al., Proc. 29th ICRC (2005).

First Estimate of the Primary Cosmic Ray Energy Spectrum above 3 EeV from the Pierre Auger Observatory (Astro-ph/0507150), The Auger Collaboration, Proc 29th ICRC(2005).

A Study of the Composition of Ultra High Energy Cosmic Rays Using the High Resolution Fly’s Eye, R.U. Abassi et al., Astrophys. J. 622, 910 (2005).

Measurement of the Flux of Ultrahigh Energy Cosmic Rays from Monocular Observations by the High Resolution Fly’s Eye Experiment, R.U. Abassi et al., Phys. Rev. Lett. 92, 151101 (2004).

Study of Small-Scale Anisotropy of Ultrahigh Energy Cosmic Rays Observed in Stereo by HiRes,R.U. Abassi et al., Astrophys. J. 610, L73 (2004).

The Energy Spectrum and the High-Resolution Fly’s Eye,  L.R. Wiencke on behalf of the HiRes Collaboration, J. Phys. G: Nucl. Part. Phys. 27, 1611 (2001).

A Fiber-Optic-Based Calibration System for the High Resolution Fly’s Eye Cosmic Ray Observatory, J.H.V. Girard et al., Nucl. Instr. Meth. A460, 278 (2001).

A Measurement of the Average Longitudinal Development Profile of Cosmic Ray Air Showers Between 10¹⁷eV and 10¹⁸eV, T. Abu-Zayyed et al., Astroparticle Phys. 16, 1 (2001).

Evidence for Changing of Cosmic Ray Composition Between 10¹⁷ and 10¹⁸ eV from Multicomponent Measurements, T. Abu-Zayyad et al., Phys. Rev. Lett. 84, 427 (2000).

Radio-Controlled Xenon Flashers for Atmospheric Monitoring at the HiRes Cosmic Ray Observatory, L.R. Wiencke et al., Nucl. Instr. Meth. A428, 593 (1999).

Precise Measurement of the Lambda⁰ and Lambda-bar⁰ Masses and a Test of CPT Invariance, E.P. Hartouni et al., Phys. Rev. Lett. 72b, 1322 (1994).

Observation of Coulomb Effects in Production of pi⁺ pi^–, p pi^–, and K⁺K^– Pairs in pp Collisions at 27.5 GeV/c, L.R. Wiencke et al., Phys. Rev. D46, 3708 (1992).

The background image shows the M87 galaxy in the Virgo Cluster of Galaxies.   A relativistic jet of particles emanate from the center of M87 which contains a super massive blackhole. At 60 million light-years distant, M87 is one of the small fraction of galaxies within the propagation distance for cosmic-ray nuclei with energies above ~5x10¹⁹eV. Active galactic nuclei, of which M87 is an example, are one possible candidate soures of high energy cosmic rays.