Robert E. Welsh
Chancellor Professor of Physics
College of William and Mary
A photo from our graduate
brochure, should you "need" that
B.S.,
Georgetown University ,(cum
laude) 1954
,
Active Duty, U.S. Air Force, 1955-1957
Ph.D.,
Pennsylvania State University
1960.
Academic/Research Positions:
1960-1963, Research Physicist, Instructor and Assistant Director of
Nuclear Research Center,
Carnegie Mellon University
1963-present, College of William and Mary Department of Physics;
Associate Professor, 1963-68
1967-1972, Assistant Director,
Space Radiation Effects Laboratory, Newport News, VA
Professor,
1968-present,
Chancellor Professor, 1992-present (Chair, Department of Physics, 1988-1991)
Research Leaves:
July, 1972 - July, 1973 Rutherford High Energy Laboratory, Emgland
January, 1983 - August, 1984, CERN, Geneva, Switzerland
July, 1994 - July, 1995, Rutherford Laboratory and Oxford University, England
~
Research Interests:
Particle Physics
My research has been principally in
experimental particle physics. Our studies have involved muons,
pions,
kaons, sigma hyperons and antiprotons. The research group at William and Mary
has included faculty members Mort Eckhause and John Kane (and,
earlier, Rolf Winter and Robert Siegel) plus
postdocs and graduate and undergraduate students. Experiments carried out by
our group
since 1980 include:
Measurement of the lifetime of the positive muon at TRIUMF
Two muonic atoms
experiments at SIN/PSI in Villigen, Switzerland; (Search for metastable 2S muonic He,
Diffusion of muonic p and d atoms.)
At CERN a measurement of the x-rays from antiproton-proton atoms and
antiproton-deuteron atoms in collaboration with British and Dutch
physicists.
And, At Brookhaven:
Search for the Standard-Model violating decay of a
neutral kaon into a muon
plus an electron (E791 and E871)
First observation of the decay of the
neutral kaon into two
electrons
Searches for the H Dibaryon
Precision measurement of the
decay of the neutral kaon into two
muons
Search for a light gluino
Measurement of the magnetic moment of the
negative sigma hyperon
Measurement of the strong interaction of kaons,
antiprotons and sigma hyperons with the nucleus; at
Brookhaven National Laboratory
We have helped design and
install the
calibration laser systems on the Time of Flight counters for the
CLAS detector in Hall B at Jefferson Laboratory.
Small Animal Imaging
Beginning in 1999, I joined with biologists from William and Mary
(Profs. Margaret
Saha and Eric Bradley) and members of Jefferson Lab's detector group (Stan
Majewski, Mark Smith, Drew Weisenberger, Randy Wojcik and Brian Kross) in
work on nuclear techniques in small-animal imaging.
This effort is based on the
development of segmented scintillators coupled to position-sensitive
photomultiplier tubes. Such devices can be used to follow the uptake of tagged
radioistopes in living systems. The availability from commercial sources of hundreds of
ligands tagged with Iodine-125 has given the possibility of new types of in vivo studies
of the metabolism of biologically interesting substances. The relatively long-lived I-125
emits soft photons (~30 keV) especially suitable in small animals such as mice.
This approach allows such studies at labs where positron emitters or
other short-lived isotopes are not available. Several talks have recently
been
given based on this work over the past several years. Most are shown
in the
list below.
Cipher and Code Devices
As a hobby I collect cipher and code devices. A short paper is in preparation(in collaboration with a Canadian
friend more skilled in this field than I)
based on a small, Swiss strip-cipher device which he owns and a similar French device which I own.
20th
c.Strip
Sphinx Cipher Device from France If you
know
the age or other facts about it, please email me. I am always pleased
to see pictures of old cipher devices or to hear of such devices that
may become available and need a new home.
(Please see below for additional pictures and links to cipher devices)
Research Students:
Ph. D. graduates in the past ten years: Rob Martin and Chris Hoff,
received
the Ph. D. in
1998. In 1999 Kevin Hern, working with our group under Mort Eckhause,
received the Ph. D.
Andrew Norman, working under John Kane, received the Ph. D. in
early
2004.
All four
of these recent students based their Ph. D. thesis on work with our
group in rare decay searches at Brookhaven Lab.
Robert Saunders - carried out his undergraduate senior honors thesis
work
in small animal imaging.He was graduated with high honors in Spring,
2000.
He presented the results of this work
at the Chapel Hill meeting of the American Physical Society. He
is studying for the Ph. D. in medical imaging at Duke.
Amoreena Ranck carried out honors research (in medical
imaging)throughout
the 2000-2001 academic year. She is presently in medical school at U. Va.
John Feldmann, Luke Ng and Kevin Knott did their senior thesis
research with us throughout 2000-2001 as well. Kevin received the
harrison Prize for undergraduate research, was elected to Phi Beta
Kappa and is now playing professional soccer. Each of these students
presented a paper at a meeting of the APS on their
research.
In Summer, 2001, Mr. Jianguo Qian, a graduate student in
Applied Science, and two physics undergraduates, Mr. Paul Brewer and Mr.
Kevin Smith, joined this project. In fall 2001, Sam Dunn began his
undergraduate
thesis research with us (Graduated May 2002) while Kevin Smith
completed his BS
in May 2003 after doing research with our group. Kevin is now in
graduate school at William and mary in the physics department. Ms.
Julie Cella
joined this effort in 2003 and graduated in May 2004. She spent
the following year working with "Teach for America" teaching at a
minority high school in New mexico. In Fall, 2004, Mr. William
Hammond and Ms Annie Guzzi joined us. Mr. Hammond received his
B.S. in May, 2005 and his thesis topic was based on the use of KI
blocking of the mouse thyroid to reduce uptake of radioactive
iodine. Ms. Guzzi worked on fluorescent/luminescent imaging using
a cooled-ccd camera to image quantum dots with a goal of employing
the technique in imaging of rodents. Mr Christopher Brittin also
joined our group and developed a reliable electronic monitor for
mice. Mr. Brittin has also worked on dual-energy imaging in x-ray
techniques with small animals.
Teaching:
- Physics 109/110, "How Things Work"
This course, intended for non-science majors, makes use of the
text by
Lou Bloomfield of the University of Virginia. The laboratory, Physics 110, is our
own creation and is in continuing need of innovative suggestions. There is an additional
"take-home" lab with battery, magnet wire, nail, magnetic compass, diffraction grating,
polaroid material, small permanant magnet motors, etc for use by students outside class.
Two popular paperback books, "Longitude" by Dava Sobel and "How Warmth Disperses"
(formerly "Maxwell's Demon" in hardback) by Hans Von Baeyer of
William and Mary's Physics Department supplement the course
material.
:
Publications, Reviews, Abstracts etc. (Since 1995)
Measurement of the Branching Ratio for the Rare Decay K0L-> mu mu
A. P. Heinson, et al.
Phys. Rev. D51, 985 (1995)
Search for the Presence of H Particles in a Neutral Beam
J. Belz, et al.
Nuc. Phys. A585, 97c (1995)
Nuclear Capture in the Atomic Cascade of Kaonic, Antiprotonic and Sigma Hyperonic Exotic Atoms
C. J. Batty and R. E. Welsh
Nuclear Physics A589, 601 (1995)
Search for Diffractive Dissociation of a Long-lived H Dibaryon
J. Belz, et al.
Phys. Rev. D53, 3487 (1996)
Search for the Weak Decay of an H Dibaryon
J. Belz, et al.
Phys. Rev. Lett. 76, 3277 (1996)
Diffusion of Muonic Deuterium and Hydrogen Atoms
D. J. Abbott, et al.
Phys. Rev. A55, 214 (1997)
Search for the Weak Decay of an H Dibaryon (Addendum)
J. Belz, et al.
Phys. Rev. C56 (1997)
First Observation of the Rare Decay K0L -> ee
D. Ambrose, et al.
Phys. Rev. Lett. 81, 4309 (1998)
New Limit on Muon and Electron Lepton Number Violation from the Decay K0L -> mu e
D. Ambrose, et al.
Phys. Rev. Lett. 81, 5734, (1998)
Thomas Edison, Life, Love and Lightbulbs
Book Review of "Edison, A Life of Invention", by Paul Israel
Physics World, p44, December 1998
A Compact Beam Stop for a Rare Kaon Decay Experiment
J. Belz, et al.
Nuc. Inst. and Meth. in Phys. Res. A428, 239 (1999)
The Time-of-Flight System for the CEBAF Large Acceptance Spectrometer
E. S. Smith, et al.
Nucl. Inst. and Meth. in Phys. Res. A432, 265-298 (1999)
Preliminary Results of the In Vivo Imaging of the Uptake of
[I-125]RTI-55
in the Mouse Using an Optimized Small Animal Gamma Camera
A. Weisenberger, B. Kross, S. Majewski, R. Wojcic, E. Bradley, M. Saha, B. Stetka,
R. Saunders and R. E. Welsh
Poster presented at High Resolution Imaging Conference, Amsterdam, September, 1999
A Gamma Ray Imaging Device for Small-Animal Studies
Robert Saunders, et al.
Paper LD.06. Presented at American Physical Society Meeting, November 1999, (Chapel Hill)
Dual-Modality Small Animal Imaging System
Amoreena Ranck, et al.
American Physical Society Division of Nuclear
Physics, October 2000
Single-Photon Computed Tomography with Large Position-Sensitive
Phototubes
John Feldmann, et al.
American Physical Society Division of Nuclear Physics, October, 2000
Improved Branching Ratio Measurement for the decay K0L-> mu+ mu-
D. Ambrose, et al.
Phys. Rev. Lett 84, 1389, (2000)
Novel Technique for Coregistration of Biological Images in a
Multimodality
Detector Array
Amoreena Ranck, et al.
American Physical Society, Southeast section, November, 2000
.
Bradley, E.L, Gleason, K. K. , Majewski, S., Ranck, A. E., Saha, M. S.
Smith, M. F. Weisenberger, A. G., Welsh, R. E. and Wojcik, R. "In Vivo
Imaging of the Distribution and Pharmacodynamics of Iodine-125 Labeled
Insulin During the Development of Streptozotocin-Induced Hyperglycemia
in the C57BL/6J Mouse with a Dedicated Gamma Imager", High Resolution
Imaging Conference, Rockville MD, Sept 2001
Weisemberger, A. G. et
al.
(same conference and authors as preceding paper, "Development of a
Miniature SPECT-CT System for Small Animnal Imaging"
Ng, Luke,
Robert E. Welsh, Eric L. Bradley, Margaret Saha, Brian Kross, Stan
Majewski, Vladimir Popov, Mark F. Smith, Andrew G. Weisenberger and
Randolph Wojcik, "Experimental Results and Predictive calaulations for
Pinhole Collimators Used in Small Animal Nuclear Imaging", American
Physical Society-Annual Meeting, Washington, DC, April, 2001."
Welsh,
R.E.,Bradley, E. L., Kross, B., Majewski, S., Popov, V., Qian, J. Ranck,
E. L.,
Saha, M. S., Smith, K., Smith, M. F., Weisenberger, A. G., and Wojcik, R.
, "An Economical Dual-Modality Small Animal Imaging System With
Application to Studies of Diabetes", IEEE Nuclear Science Symposium, San
Diego, CA, November, 2001.
Book Review of: "The
Wonders of Physics"
Lev Aslamazov and Andrei Varlamov,
2001, World Scientific
Physics World, November
2001
Weisenberger, A. G., Wojcik, R., Bradley,
E. L., Brewer, P., Majewski, S., Qian, J., Ranck, A. E., Saha, M. S.,
Smith, K., Smith, M. F., and Welsh, R. E.,"SPECT-CT System for Small
Animal Imaging", IEEE Nuclear Science Symposium and Medical Imaging
Conference, San Diego, CA, Nov. 2001,
Saha, M. S., Bradley, E. L. , Brewer, P., Gleason, K. K. , Kross, B.
, Majewski, S., Popov, V., Qian, J., Ranck, A., Smith, K., Smith, M.
F., Weisenberger, A. G., Wojcik, R., Welsh, R. E., "Incorporation of
a Fluoroscopic X-Ray Modality in a Small Animal Imaging System,",
IEEE Trans. Nucl. Sci., pp. 333-338, vol. 50, no. 3, June
2003.
Weisenberger AG, Wojcik R, Bradley EL, Brewer P, Majewski S, Qian
J,
Ranck A, Saha MS, Smith K, Smith MF, Welsh RE, "SPECT-CT System for
Small Animal Imaging,"
IEEE Trans. Nucl. Sci. pp. 74-79, vol 50, no. 1, February,
2003.
Robert E. Welsh, Eric L. Bradley, Julie Cella, Brian Kross, Stan
Majewski,
Vladimir Popov, Jianguo Qian, Margaret S. Saha, Kevin Smith, Mark F.
Smith,
Andrew G. Weisenberger and Randolph Wojcik, "Simultaneous 125I SPECT
Imaging of Small Animals with Pinhole and Parallel Collimation";
Paper M7-42, presented (by J. Qian) at IEEE Medical Imaging
Conference, October, 2003, Portland, OR.
"Comparison of CsI(Tl) and NaI(Tl) Pixel Scintillators"
K. J. Smith, E. L. Bradley, J. T. Cella, M. S. Saha and R. E. Welsh
Talk HB.006, American Physical Society, Wilmington, NC, November
2003.
J. T. Cella, E. L. Bradley, M. S. Saha, K. J. Smith and R. E. Welsh
"Use of Optical Coupling and Glass Spacers in Position Sensitive
Scintillation Detectors" Talk HB.003 American Physical Society,
Wilmington, NC, November 2003.
Practical Aspects of 125I SPECT Imaging: Mouse Bed and Bed Support
E. L. Bradley, M. S. Saha, R. E Welsh, A. G. Weisenberger and R.
Wojcik; Abstracts of Accepted Submissions to HiRes Conference,
Madrid, Spain, September 2003.
J. T. Cella, Small Animal Nuclear Imaging. Undergraduate Research
Symposium, September 2003. Williamsburg, VA.
A "Mouse-Sized" Gamma Camera for Biological Imaging, Eric L. Bradley,
Julie Cella, Stan Majewski, Vladimir Popov, Jianguo Qian, Margaret S.
Saha, Mark F. Smith, Andrew G. Weisenberger, and
Robert E. Welsh. Conference record, Rome Meeting of IEEE Medical
Imaging Conference, October, 2004.
Nuclear imaging of iodine uptake in mouse tissues, W.T.
Hammond, J.T. Cella, C. McLoughlin, K.J. Smith, R.E. Welsh, E.L.
Bradley, M.S. Saha, J. Qian, S. Majewski, V. Popov
M.F. Smith and A.G. Weisenberger
Recent Colloquia
and Seminars Presented
The talks I have given in the past few years have been based on my avocation, codes and ciphers, and have included
demonstrations using my Enigma Machine
(German
Army type; Serial Number A 10360) and
Swiss
NEMA cryptographic machine
the 1943/44 Swiss electromechanical cipher device. Also included is
theU.S. Army M209B Converter
cryptographic device
(mine made by Smith-Corona Typerwiter Company in the
1940's)
Our recent
presentations
on Small Animal Imaging are listed in the previous section.
"The Enigma Machine"
Jefferson Lab Colloquium
6 May 1998
"Codes and Ciphers, The German Enigma Machine"
Physics Colloquium, Old Dominion University
October, 1998
"The Enigma Machine"
Homecoming Academic Festival, William and Mary
October, 1998
"Electromechanical Cipher Devices"
Colloquium, Computer Science Department, College of William and Mary
November, 1998
"How the Polish and Bletchley Park Mathematicians broke the Enigma"
Homecoming Academic Festival, William and Mary
October, 1999
and: Jefferson Lab Graduate Student Seminar
Summer, 2000
"The Real Story Behind the Movie U571/ How the German Four-Rotor Naval
Enigma was Broken"
Homecoming Academic Festival, College of William and Mary
October, 2000
"Electromechanical Cipher Devices"
Homecoming Academic Festival,
William and Mary, October 2001.
"The Enigma Machine and Other Mechanical Cipher Devices"
The Mariners Museum, Newport News, VA, 27 Feb. 2003
"Breaking the Enigma Cipher in WWII",
Christopher Wren Town and Gown, Williamsburg, VA, 13 March
2003.
"Was a Misalligned Rotor in a German Enigma Cipher Machine the
Origin of the Naval Four-Rotor Enigma?"
XXII Scientific
Instrument Symposium,
Newport News, VA, September, 2003
Contact points:
Office (W&M): (757) 221-3505 (Tuesdays, Thursdays, Afternoons of Fridays)
Jefferson Lab: Head, Student Affairs office and Coordinator of Virginia Physics
Consortium (757) 269-7583
FAX: (757) 221-3540
E-Mail: welsh@physics.wm.edu or welsh@jlab.org
Snail-Mail: Dept. of Physics
College of William and Mary
Williamsburg, Virginia
23187 USA
Some Enigma Links of Interest, many with links to others.
Download Your Own
Enigma Machine
Frode Weierud's crypto
pages and links
Bill Momson's
articles from Nautical Brass Magazine
With special reference to the three Polish codebreakers who first broke Enigma
Univ. of Arizona math course of interest
Richard
Brisson's
"Vintage Cryptographic Equipment" page
David Hamer's
list of links to crypto sites
David Hamer's home
page
Please email any comments or questions...
last updated 9 May 2005
W&M Physics Department
home page
College of W&M home page
welsh@physics.wm.edu