Lawrence Wiencke Ph.D.
Professor, Department of Physics
Colorado School of Mines, Golden Colorado, 80401 USA
contact information

    L. Wiencke photo         L. Wiencke in the Pampas of Argentina     

CV    Publications List

PH326 Advanced Lab II Spring

Research Activities  
High Energy Cosmic Rays: Pierre Auger Observatory
High Energy Cosmic Rays: Extreme Universe Space Observatory Super Pressure Balloon Mission  
 Laser Test Beam for Cosmic Ray Observatories

Various research tools

Some Past Projects:
Calibration by RaYleigh Scattering (C-RAYS)
 High Resolution Fly's Eye

Selected Publications

“Atmospheric Super Test Beam for the Pierre Auger Observatory”, L. Wiencke for the Pierre Auger Collaboration and A. Botts, C. Allan, M. Calhoun, B. Carande, M. Coco, J. Claus, L. Emmert, S. Esquibel, . Hamilton, T.J. Heid, F. Honecker, M. Iarlori, S. Morgan, S. Robinson, D. Starbuck, J. Sherman, M. Waken, and O. Wolf, Proc 32nd International Cosmic Ray Conference (August, 2011).

“The exposure of the hybrid detector of the Pierre Auger Observatory”, The Pierre Auger Collaboration, Astroparticle Physics 34 368-381 (2011).

“Measurement of the Depth of Maximum of Extensive Air Showers above 1018 eV”,The Pierre Auger Collaboration, Phys. Rev. Lett. 104, 091101 (2010).

"The Fluorescence Detector of the Pierre Auger Observatory", The Pierre Auger Collaboration, NIMA, 620 p227 (2010).

“A study of the effect of molecular and aerosol conditions in the atmosphere on air fluorescence measurements at the Pierre Auger Observatory”, The Pierre Auger Collaboration, Astroparticle Physics 33, 108 (2010).

 “Observation of the suppression of the Flux of cosmic Rays above 4x1019 eV",The Pierre Auger Collaboration  Physics Review Letters, 101 061101 (2008).

“First Observation of the Greisen-Zatsepin-Kuzmin Suppression”, R. Abassi et al (The HiRes Collaboration) Physical Review Letters 100 101101 (2008)

"Correlation of the Highest-Energy Cosmic Rays with Nearby Extragalactic Objects”, The Pierre Auger Collaboration (9 November 2007) Science 318 (5852), 938.

“A measurement of time-averaged aerosol optical depth using air-showers observed in stereo by HiRes" R. Abbasi, et al. Astroparticle Physics 25 p93 (2006).

“ The Central Laser Facility at the Pierre Auger Observatory "B. Fick et al., JINST 1, p11003 (2006).

"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).

“ Evidence for Changing of Cosmic Ray Composition Between 1017 and 1018 eV from Multicomponent Measurements", T. Abu-Zayyad et al., Phys. Rev. Lett. 84, 4276 (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).


"System and method for precise absolute time event generation and capture", J. Smith, J. Thomas, S. Thomas, L. Wiencke  US Patent # 7975160 Awarded July 5 2011

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 sources of high energy cosmic rays.