Robert Johnson

Professor, Physics Department

Merrill College


WRITINGS AND CREATIVE ACTIVITIES IN PROGRESS

Journal Articles        

In Press: (4) V.A. Bashkirov, R.P. Johnson, H F.-W. Sadrozinski, R.W. Schulte, "Development of Proton Computed Tomography for Applications in Hadron Therapy," NIM Advances in Detectors and Applications for Medicine, May 2015.

Submitted: (5) V.A. Bashkirov, R.P. Johnson, et al., "Novel Scintillation Detector Design and Performance for Proton Radiography and Computed Tomography," submitted to Med. Phys. June 30, 2015.

Submitted: (6) R.P. Johnson, et al., "A Fast Pre-Clinical Head Scanner for Proton CT," submitted to IEEE Transactions Nuclear Science, June 9, 2015.

In Press: (9) M. Ackermann et al., Updated Search for Spectral Lines from Galactic Dark Matter Interactions with Pass-8 Data from the Fermi Large Area Telescope, to be published in Phys. Rev. D.

 

Papers in Conference Proceedings        

Submitted: (10) R. P. Johnson et al., Results from a Preclinical Head Scanner for Proton CT, contribution M11-63 to the IEEE November 2014 Medical Imaging Conference, Seattle WA.


PUBLICATIONS AND SCHOLARLY WORK

Journal Articles        

2014

(3) T. Plautz et al., "200 MeV Proton Radiography Studies with a Hand Phantom using a Prototype Proton CT Scanner," IEEE Trans. Med. Imaging 33, 875-881, 2014.

2013

(8) A.A. Abdo et al. (Fermi-LAT Collaboration), "The Second Fermi Large Area Telescope Catalog of Gamma-ray Pulsars," Ap.J. Suppl. 208, p. 17, 2013.

2013

(2) R. Johnson, Joel DeWitt, Cole Holcomb, Scott Macafee, Hartmut F.-W. Sadrozinski, David Steinberg, "Tracker Readout ASIC for Proton Computed Tomography Data Acquisition," IEEE Trans. Nucl. Sci. 60, 3262-3269, 2013.

2013

H.F.-W. Sadrozinski, R.P. Johnson et al., "Development of a Head Scanner for Proton CT," Nucl. Instr. Meth. A 699, pp. 205-210, 2013. doi: 10.1016/j.nima.2012.04.029.

2012

(7) M. Ackermann et al. (Fermi-LAT Collaboration), "The Fermi Large Area Telescope On Orbit: Event Classification, Instrument Response Functions, and Calibration, ApJ Suppl. 203, p. 4, 2012.

2012

M. Ackermann et al., Search for Dark Matter Satellites using Fermi-LAT, ApJ 747, 121.

2012

(1) R. W. Schulte, V. Bashkirov, R. Johnson, H. F.-W.Sadrozinski, and K. E. Schubert, "Overview of the LLUMC/UCSC/CSUSB phase 2 proton CT project," T. Am. Nucl. Soc. 106, pp. 59-62, 2012.

2012

M. Ackermann et al., Fermi-LAT Observations of the Diffuse Gamma-Ray Emission: Implications for Cosmic Rays and the Interstellar Medium, ApJ 750, 3.

2012

P.L. Nolan et al., Fermi Large Area Telescope Second Source Catalog, ApJ Suppl. 199, DOI: 10.1088/0067-0049/199/2/31.

2011

Review: T.A Porter, R.P. Johnson, P.W. Graham, Dark Matter Searches with Astroparticle Data, Annual Reviews of Astronomy and Astrophysics 49, 156. INVITED

2011

M. Dormody, R.P. Johnson et al., Sensitivity of Blind Pulsar Searches with the Fermi-LAT, ApJ 742, 126.

2011

M. Ackermann et al., Constraining Dark Matter Models from a Combined Analysis of Milky Way Satellites with the Fermi Large Area Space Telescope, Phys. Rev. Lett. 107, 241302.

2010

A.A. Abdo et al., The First Fermi Large Area Telescope Catalog of Gamma-ray Pulsars, ApJS 187, 460.

2010

P.M. Saz Parkinson et al., Eight Gamma-Ray Pulsars Discovered in Blind Frequency Searches of Fermi-LAT Data, Ap.J. 725, 571

2010

B. Anderson et al., Fermi-LAT Sensitivity to Dark Matter Annihilation in Via Lactea II Substructure, Ap.J. 718, 899

2010

A.A. Abdo et al., Gamma-Ray Emission Concurrent with the Nova in the Symbiotic Binary V407 Cygni, Science 329, 817.

2010

M. Ackermann et al., Fermi LAT Observations of Cosmic-Ray Electrons from 7 GeV to 1 TeV, Phys. Rev. D, 092004.

2010

A.A. Abdo et al., Fermi Large Area Telescope Constraints on the Gamma-ray Opacity of the Universe, ApJ 723, 1082.

2010

A.A. Abdo et al., The Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived From First-Year Fermi Large Area Telescope Data, Phys. Rev. Lett. 104, 101101.

2010

A.A. Abdo et al., Fermi Large Area Telescope First Source Catalog, ApJ Suppl. 188, 405.

2010

A.A. Abdo et al., Fermi LAT Search for Photon Lines from 30 to 200 GeV and Dark Matter Implications, Phys. Rev. Lett. 104, 091302.

2010

A.A. Abdo et al., Observations of Milky Way Dwarf Spheroidal Galaxies with the Fermi-LAT Detector and Constraints on Dark Matter Models, ApJ 712, 147.

2010

A.A. Abdo et al., Fermi Large Area Telescope Observations of the Crab Pulsar and Nebula, ApJ 708, 1254.

2009

A.A. Abdo et al. (LAT Collab.), Pulsed Gamma-rays from the Millisecond Pulsar J0030+0451 with the Fermi Large Area Telescope, Ap.J. 699, 1171

2009

A.A. Abdo et al. (LAT Collab.), Fermi Discovery of Gamma-Ray Emission from NGC 1275, Ap.J. 699, 31

2009

A.A. Abdo et al. (LAT Collab.), Simultaneous observations of PKS 2155-304 with H.E.S.S., Fermi, RXTE and ATOM: spectral energy distributions and variability in a low state, Ap.J. 696, L150-L155

2009

A.A. Abdo et al. (LAT Collab.), Fermi/LAT Discovery of Gamma-Ray Emission from the Flat Spectrum Radio Quasar PKS 1454-354, Ap.J. 697, 934

2009

A.A. Abdo et al. (LAT Collab.), Discovery of Pulsed Gamma Rays from the Young Radio Pulsar PSR J1028-5819 with the Fermi Large Area Telescope, Ap.J. 695, L72-L77

2009

A.A. Abdo et al. (LAT Collab.), Fermi Large Area Telescope Bright Gamma-ray Source List, arXiv:0902.1340v2, Ap.J. Suppl. 183, 46

2009

A.A. Abdo et al. (LAT Collab.), Sixteen Gamma-Ray Pulsars Discovered in Blind Frequency Searches Using the Fermi LAT, Science 325, 840

2009

A.A. Abdo et al. (LAT Collab.), Fermi Large Area Telescope Observations of the Vela Pulsar, Ap.J. 696, 1084

2009

A.A. Abdo et al., Fermi LAT Measurements of the Diffuse Gamma-Ray Emission at Intermediate Galactic Latitudes, Phys. Rev. Lett. 103, 251101

2009

A.A. Abdo et al. (LAT Collab.), A Population of Gamma-Ray Millisecond Pulsars Seen with the Fermi Large Area Telescope, Science 325, 848

2009

A.A. Abdo et al., Fermi Observations of TeV-Selected AGN, ApJ 707, 1310.

2009

A.A. Abdo et al., Fermi Large Area Telescope Gamma-Ray Detection of the Radio Galaxy M87, ApJ 707, 55.

2009

M. Ackermann et al., A Limit on the variation of the speed of Light Arising from Quantum Gravity Effects, Nature 462, 331.

2009

R.P. Johnson and R. Mukherjee, GeV Telescopes: Results and Prospects for Fermi, New Journal of Physics 11, 055008 doi: 10.1088/1367-2630/11/5/055008

2009

A.A. Abdo et al., Fermi LAT Observation of Diffuse Gamma-Rays Produced Through Interactions between Local Interstellar Matter and High Energy Cosmic Rays, ApJ 703, 1249.

2009

A.A. Abdo et al. (LAT Collab.), The On-Orbit Calibration of the Fermi Large Area Telescope, arXiv:0904.2226v1, Astroparticle Phys. 32, 193

2009

A.A. Abdo et al., Fermi LAT Observations of LSI+61 303: First Detection of an Orbital Modulation in GeV Gamma Rays, ApJ 701, L123.

2009

W.B. Atwood et al. (LAT Collab.), The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission, Ap.J. 697, 1071-1102

2009

A.A. Abdo et al. (LAT Collab.), Fermi Large Area Telescope Bright Gamma-ray Source List, Ap.J. Suppl. 183, 46

2009

A.A. Abdo et al. (LAT Collab.), Fermi Observations of High-Energy Gamma-Ray Emission from GRB 080916C, Science 323, 1688

2009

A.A. Abdo et al. (LAT Collab.), Measurement of the Cosmic-Ray e+ plus e- Spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope, Phys. Rev. Lett. 102, 181101

2008

E.A. Baltz et al., Pre-Launch Estimates for GLAST Sensitivity to Dark Matter Annihilation Signals, JCAP doi: 10.1088/1475-7516/2008/07/013

2008

M. Ziegler, B.M. Baughman, R.P. Johnson, W.B. Atwood, A Search for Radio Quiet Gamma-Ray Pulsars in EGRET Data Using a Time Differencing Technique, Ap.J. 680, 620-626

2008

R. Bagagli et al., Environmental Tests of the flight GLAST LAT Tracker Towers, Nucl. Instr. Meth. A 584, 358-373.

2008

A.A. Abdo et al. (LAT Collab.), The Fermi Gamma-Ray Telescope Discovers the Pulsar in the Young Galactic Supernova Remnant CTA 1, Science 322, 1218

2007

W. Atwood et al., Design and Initial Tests of the Tracker-Converter of the Gamma-ray Large Area Space Telescope, Astroparticle Physics 28, 422-434.

2007

C. Sgro et al., Construction, Test, and Calibration of the GLAST Silicon Tracker, Nucl. Instr. Meth. A 583, 9-13

2006

W.B. Atwood, M. Ziegler, R.P. Johnson, B.M. Baughman, A Time Differencing Technique for Detecting Radio-Quiet Gamma-Ray Pulsars, Astrophys. J. 652, L49-L52.

2006

L. Baldini et al., Fabrication of the GLAST Silicon Tracker Readout Electronics, IEEE Trans. Nucl. Sci. 53, 3013-3020.

2006

L. Baldini et al., The Silicon Tracker Readout Electronics of the Gamma-Ray Large Area Space Telescope, IEEE Trans. Nucl. Sci. 53, 466.

2004

R. Rando et al., Radiation Testing of GLAST LAT Tracker ASICs, IEEE Trans. Nucl. Sci. 51, 1067.

2003

V. Re, et al., Performance of the BaBar Silicon Vertex Tracker, Nucl. Instrum. Meth. A501, 14.

2002

V. Re et al., The BaBar Silicon Vertex Tracker: Performance, Running Experience, and Radiation Damage Studies, IEEE Trans. Nucl. Sci. 49, 3284-3289

2002

B. Aubert et al. (BaBar Collab.), Measurement of branching fractions for exclusive B decays to charmonium final states, Phys. Rev. D 65, 032001

2002

B. Aubert et al. (BaBar Collab.), A Study of B+- ---> J / Psi pi+- and B+- ---> J / Psi K+- decays: Measurement of the ratio of branching fractions and search for direct CP violating charge asymmetries, Phys. Rev. D 65, 091101

2002

B. Aubert et al. (BaBar Collab.), Measurement of the branching fractions for psi(2S) ---> e+ e- and psi(2S) ---> mu+ mu-, Phys. Rev. D 65, 031101

2002

B. Aubert et al. (BaBar Collab.), Study of CP violating asymmetries in B0 ---> pi+ pi-, K+ pi- decays, Phys. Rev. D 65, 051502

2002

B. Aubert et al. (BaBar Collab.), Measurement of B ---> K* gamma branching fractions and charge asymmetries, Phys. Rev. Lett. 88, 101805

2002

B. Aubert et al. (BaBar Collab.), Measurement of D(s)+ and D*(s)+ production in B meson decays and from continuum e+ e- annihilation at s**(1/2) = 10.6-GeV, Phys. Rev. D 65, 091104

2002

D.J. Thompson, et al., Gamma-Ray Large Area Space Telescope (GLAST) Balloon Flight Engineering Model: Overview, IEEE Trans. Nucl. Sci. 49, 1898.

2002

V. Re, et al., The Babar Silicon Vertex Tracker, Performance and Running Experience, Nucl. Instrum. Meth. A485, 10.

2002

B. Aubert et al. (BaBar Collab.), The Babar Detector, Nucl. Instrum. Meth. A479, 1.

2002

Keeney, B., Bashkirov, V., Johnson, R.P., Kroeger, W., Ohyama, H., Sadrozinski, H.F.-W., Schulte, R.W.M., Seiden, A., Spradlin, P. A silicon telescope for applications in nanodosimetry, IEEE Trans. on Nucl. Science, 49 (4), pp. 1724-1727 (2002).

2001

B. Aubert et al. (BaBar Collab.), Measurement of CP violating asymmetries in B0 decays to CP eigenstates, Phys. Rev. Lett. 86, 2515-2522

2001

B. Aubert et al. (BaBar Collab.), Measurement of the decays B ---> phi K and B ---> phi K*, Phys. Rev. Lett. 87, 151801

2001

B. Aubert et al. (BaBar Collab.), Measurement of branching fractions and search for CP violating charge asymmetries in charmless two-body B decays into pions and kaons, Phys. Rev. Lett. 87, 151802

2001

B. Aubert et al. (BaBar Collab.), Measurement of j / psi production in continuum e+ e- annihilations near s**(1/2) = 10.6-GeV, Phys. Rev. Lett. 87, 162002

2001

B. Aubert et al. (BaBar Collab.), Measurement of the B0 and B+ meson lifetimes with fully reconstructed hadronic final states, Phys. Rev. Lett. 87, 201803

2001

B. Aubert et al. (BaBar Collab.), Measurement of the B ---> J / psi K*(892) decay amplitudes, Phys. Rev. Lett. 87, 241801

2001

B. Aubert et al. (BaBar Collab.), Search for the decay B0 ---> gamma gamma, Phys. Rev. Lett. 87, 241803

2001

B. Aubert et al., Measurements of the branching fractions of exclusive charmless B meson decays with eta-prime or omega mesons, Phys. Rev. Lett. 87, 221802

2001

E. do Couto e Silva et al., Results from the beam test of the engineering model of the GLAST large area telescope, Nucl. Instrum. Meth. A474, 19-37.

2001

P. Allport, et al., The Assembly of the Silicon Tracker for the GLAST Beam Test Engineering Model, Nucl. Instrum. Meth. A466, 376.

2001

E. Atwood, et al., The Silicon Tracker of the Beam Test Engineering Model of the GLAST Large Area Telescope, Nucl. Instrum. Meth. A457, 126.

2001

B. Aubert et al. (BaBar Collab.), Observation of CP Violation in the B0 Meson System, Phys. Rev. Lett. 87, 091801

2000

W.B. Atwood, et al., Beam test of Gamma-ray Large Area Space Telescope components, Nucl. Instrum.Meth. A446, 444-460.

1998

R. Barate, et al. (ALEPH Collab.), Studies of Quantum Chromodynamics with the ALEPH Detector, Phys. Rep. 294, 1.

1997

I. Kipnis, et al., A Time Over Threshold Machine: the Readout Integrated Circuit for the Babar Silicon Vertex Tracker, IEEE Trans. Nucl.Sci. 44, No. 3, p. 289.

1997

R.P. Johnson, et al., An Amplifier Discriminator Chip for the GLAST Silicon Strip Tracker, IEEE Trans. Nucl. Sci., 1997 NSS/MIC Conference issue

1996

D. Buskulic, et al. (ALEPH Collab.), Observations of Charmless Hadronic B Decays, Phys. Lett. B384, 471-480.

1996

R. Becker, et al., Signal Processing in the Front End Electronics of BaBar Vertex Detector, Nucl.Instru.Meth. A377, 459.

1996

R.P. Johnson, BaBar Silicon Vertex Tracker, Nucl. Instrum. Meth. A383, 7-12.

1995

D. Buskulic, et al. (ALEPH Collab.), Performance of the Aleph Detector at LEP, Nucl. Instr. Meth. A360, p.3.

1994

D. Buskulic, et al. (ALEPH Collab.), Heavy Flavour Production and Decay with Prompt Leptons in the Aleph Detector, Zeitschrift fuer Physik C 62, 179-198.

1994

D. Buskulic, et al. (ALEPH Collab.), Heavy Quark Tagging with Leptons in the Aleph Detector, Nuclear Instr. Meth. in Physics Research A 346, 461-475.

1993

D. Buskulic, et al. (ALEPH Collab.), First Measurement of the Bs Meson Mass, Phys. Lett. B 311, 425-436.

1993

D. Buskulic, et al. (ALEPH Collab.), Search for Particles with Unexpected Mass and Charge in Z Decays, Phys. Lett. B 303, 198-208.

1993

D. Buskulic, et al. (ALEPH Collab.), A Precise Measurement of Γzb‾b Γz→ hadrons, Physics Letters B 313, 535-548.

1991

W. Wiedenmann, et al., Tracking With the ALEPH Time Projection Chamber, IEEE Trans. Nucl.Sci. 38, 432-440.

1991

D. Decamp, et al. (ALEPH Collab.), Measurement of Forward Backward Asymmetry in Z → b‾band Z→c‾c, Phys. Lett. B 263, 325.

1991

D. Decamp, et al. (ALEPH Collab.), Charged Particle Pair Production Associated with a Lepton Pair in Z Decays: Indication of an Excess in the Tau Channel, Phys. Lett. B 263, 112.

1991

D. Decamp, et al. (ALEPH Collab.), Measurement of B-‾B Mixing at the Z, Phys. Lett. B 258, 237.

1991

W.B. Atwood, et al., Performance of the ALEPH Time Projection Chamber, Nucl. Instrum. Methods A306, 446.

1990

D. Decamp, et al. (ALEPH Collab.), Heavy Flavour Production in Z Decays, Phys. Lett. B 244, 551.

1990

D. Decamp, et al. (ALEPH Collab.), A Precise Determination of the Number of Families with Light Neutrinos and of the Z Boson Partial Widths, Phys. Lett. B 235, 399.

1990

D. Decamp, et al. (ALEPH Collab.), Determination of the Leptonic Branching Ratios of the Z, Phys. Lett. B 234, 399.

1990

D. Decamp, et al. (ALEPH Collab.), Properties of Hadronic Events in e +e-- Annihilation at √s = 91 GeV, Phys. Lett. B 234, 209.

1990

D. Decamp, et al. (ALEPH Collab.), ALEPH: A Detector for Electron Positron Annihilations at LEP, Nucl. Instrum. Methods A 294, 121.

1989

S.R. Amendolia, et al. (ALEPH Collab.), The Spatial Resolution of the ALEPH TPC, Nucl. Instrum. Methods A 283, 573.

1989

D. Decamp, et al. (ALEPH Collab.), Determination of the Number of Light Neutrino Species, Phys. Lett. B 231, 209.

1986

G.R. Bonneaud, A. Courau, R.P. Johnson, H. Yamamoto, et al. (DELCO Collab.), Quasi Real Compton Scattering Measurement and e* Search with Delco at PEP, Phys. Lett. B 177, 109.

1984

A. Courau, R.P. Johnson, S.S. Sherman, et al. (DELCO Collab.), Pion Pair Production from γγ Interactions at PEP and the Radiative Width of the f0 Meson, Phys. Lett. B 147, 227.

 

Papers in Conference Proceedings        

2011

H.F.-W. Sadrozinski et al., "Detector Development for Proton Computed Tomography (pCT)," 2011 IEEE Nucl. Sci. Symp. Conference Record.

2010

R.P. Johnson, Recent Results from the Fermi Gamma-ray Space Telescope, Proceedings of the 35th International Conference of High Energy Physics, Proceedings of Science 434. INVITED

2010

L. Rochester, T. Usher, R.P. Johnson, W. Atwood, Upgrades to the Event Simulation and Reconstruction for the Fermi Large Area Telescope, 2009 Fermi Syposium, arXiv:1001.5005.

2009

R.P. Johnson, Fermi Gamma-ray Space Telescope, Introduction and Highlights from the First Eight Months, Contribution to the 10th Conference on the Intersection of Particle and Nuclear Physics, American Institute of Physics

2007

M. Ziegler, R.P. Johnson, B.M. Baughman, W.B. Atwood, G.A. Caliandro, A Blind Search for Pulsars in EGRET Data using a Time Differencing Technique, Steven Ritz, Peter Michelson, Charles Meegan, Proceedings of the First GLAST Symposium, American Institute of Physics, 433

2007

R.P. Johnson, The GLAST LAT Silicon Strip Tracker Converter, Steven Ritz, Peter Michelson, Charles Meegan, Proceedings of the First GLAST Symposium, American Institute of Physics, 554

2007

B.M Baughman, W.B. Atwood, R.P. Johnson, T.A. Porter, M. Ziegler, A Fresh Look at Diffuse Gamma-ray Emission from the Inner Galaxy, Proceedings of the 30th International Cosmic Ray Conference, arXiv:0706.0503v1

2007

T.A. Porter, W.B. Atwood, B. Baughman, R.P. Johnson, A Monte Carlo Study of the Irreducible Background in the EGRET Instrument, Contribution to the 30th International Cosmic-Ray Conference, arXiv:0706.0220v1

2006

R.P. Johnson, Electronics for Satellite Experiments, Proceedings of International Symposium on Detector Development for Particle, Astroparticle and Synchrotron Radiation Experiments (SNIC 2006), Menlo Park, California, 3-6 Apr 2006, SLAC, SLAC-PUB-11862, 53.

2006

R.P. Johnson, The GLAST Gamma-ray Telescope Mission, P.D. Barnes, M.D. Cooper, R.A. Eisenstein, H. van Hecke, G.J. Stephenson, Particles and Nuclei, Proceedings of the 17th International Conference on Particle and Nuclei, American Institute of Physics, 1010

2002

R.P. Johnson, The GLAST Large Area Telescope Instrument, Proceedings of the 1st International Conference on Particle and Fundamental Physics in Space, May 2002; Nucl. Phys. B (Proc. Suppl.) 113, 247-251.

2000

R.P. Johnson, et al., The Readout Electronics for the Silicon Tracker of the GLAST Beam Test Engineering Model, Proceedings of the 4th International Symposium on Development and Application of Semiconductor Tracking Detectors, Hiroshima Japan, March 2000, SLAC, SLAC-PUB-8549, 16p.

2000

R.P. Johnson, The Physics and Status of the Gamma-ray Large Area Space Telescope, Katsushi Arisaka and Zvi Bern, Proceedings of the 1999 Meeting of the APS Division of Particles and Fields

2000

R.P. Johnson, The GLAST Silicon Strip Tracking System, Mark L. McConnel, James M. Ryan, Proceedings of the Fifth Compton Symposium, American Institute of Physics, 754

1993

R.P. Johnson, Cascade and Omega Production in Z Decays, C.H. Albright, P.H. Kasper, R. Raja, J. Yoh, The Fermilab Meeting, 7th Meeting of the APS Division of Particles and Fields, World Scientific, 621

1991

R.P. Johnson, Coupling of the Z to b,b-bar and c,c-bar and B,B-bar Mixing, K.K. Phua and Y. Yamaguchi, Proceedings of the 25th International Conference on High Energy Physics 837

1990

R.P. Johnson, Properties of Hadronic Events in e+e- Annihilation at sqrt(s)=91 GeV, Billy Bonner and Hannu Miettinen, Proceedings of the Rice Meeting, 1990 Meeting of the Division of Particles and Fields of the APS 344