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Dr. Neven Simicevic

Contact Info

Office: Engineering Annex, 212

Email: neven@phys.latech.edu
Phone: 318-257-3591

Fax: 318-257-4228

Class Info

Education

University of Zagreb, Zagreb, Croatia

B.S. in Physics, 1983.
M.Sc. in Physics (Nuclear Physics and Physics of Elementary Particles), 1987.
Ph.D. in Experimental Nuclear Physics, 1990. Thesis title: " Pion Absorption on Three-Nucleon Systems"

Research Areas/Interests

Experimental Physics. Researching, designing and prototyping instruments and developing new methods for experimental physics. Discovering and understanding of new physical phenomena. Teaching.

PROFESSIONAL EXPERIENCE

Research Assistant, University of Zagreb, Zagreb, Croatia. 1983-90

Collaborated in series of experiments at Paul Scherrer Institute, Switzerland, which measured the pion absorption in 3He, 4He, and 3H in kinematically complete way at pion energies around delta-resonance. Responsible for the neutron detector. Demonstrated exceptional troubleshooting abilities. Quickly diagnosed and fixed hardware and software errors through extensive knowledge of both the detector and the associated physics.
Involved in a teaching at the University as a Teaching Assistant in Nuclear Physics, Nuclear Physics Laboratory, General Physics and Laboratory for General Physics.

Exchange Scientist, Kernforschungszentrum Karlsruhe, Karlsruhe, Germany, 1984, 1989

Worked on the analysis of the data from the experiments on pion absorption in 3He, 4He, and 3H. Wrote major sections of the analysis code, especially connection to the data acquisition code, new chamber track reconstruction, new neutron detector counter data analysis, and data representation for kinematically complete experiment.
Wrote a program for detectors calibration and monitoring the stability of the detectors using light emitting diodes (LED).
Simulated neutron detection for neutron counter. Calculated neutron detection efficiencies as a function of neutron energy and angle. Involved in a Large Acceptance Detector System (LADS) experiment through calculation of neutron detection efficiencies for the LADS detector.
Designed and supervised the construction of some detector components for the 4? detector system. Worked closely with mechanical engineers, manufacturers, draftsmen and technicians.
Designed parts of the trigger electronics for 4? detector system that, with the possibility of prescaling different multinucleon channels, increased the amount of interesting data that could be collected during an experiment.

Research Associate, MIT, Cambridge, USA, 1990-94

Played major role in the LADS-collaboration experiments designed to measure most of the pion - nucleus reaction channels using 4? detector system. Responsible for the beam line (magnets, slits, collimators, beam profile monitors, timing and beam definition counters, system of veto counters...). This required planing and leading a group of six people.
Wrote a program for automatic and fast detectors control, the only way for fast diagnosis of changes and errors in such a complicate detector system as LADS.
Wrote sections of the analysis code. Wrote a program for automatic, fast and precise time and energy calibration for 4? detector system.
Suggested a model for pion absorption on multinucleon system. Remarkable agreement between model and data resulted in four publications.
Collaborated in the injection flash study for a new electron ring accelerator at MIT-Bates Linear Accelerator Center, Middleton, Massachusetts.

Research Associate, University of Illinois, Urbana-Champaign, USA, 1994-97

Collaborating in SAMPLE experiment, parity violation measurement of the longitudinally polarized electron scattering on proton at MIT-Bates Linear Accelerator Center. Worked on Cherenkov detector, liquid hydrogen target, beam transport simulation, beam position monitors and data analysis.
Wrote a program for electron-proton elastic and inelastic scattering applicable for the Thomas Jefferson National Accelerator Facility, Newport News, Virginia (TJNAF) beam energy range. The program estimates rates, cross sections, asymmetries and other physical quantities for any detector configuration with various physical models. The program is useful for fast estimate of feasibility of an experiment.
Wrote a GEANT based program for simulation of G0 detector response in the parity violation measurements at TJNAF. The results of this program were used for decision making in designing parts of the G0 detector. A separate version of the program was used for the SAMPLE experiment.
Involved in the E89-012 deuteron photodisintegration experiment at TJNAF.

Assistant Professor, Louisiana Tech University, Ruston, USA, 1997-present

Involved in teaching at the University as a professor of General, Elementary, and Descriptive Physics for physics and non-physics majors, Undergraduate Physics Laboratories for non-physics majors, Modern Physics Laboratory for physics majors, and Graduate Classical Electrodynamics.
Involved in the experimental program at TJNAF. Designed and tested the detector systems for parity violation measurements of the longitudinally polarized electron scattering on proton for G0 experiment.
Simulated several scenarios for the TJNAF Hall C parity violation measurements published as G0 internal reports. They include acceptance calculation for the G0 detector system, simulation of polarized proton scattering in collimators, overall effects of the collimator tolerances on the definition of lengths of the Focal Plane Detector Segments, some background criteria for the G0 backward angle measurements, energy deposition and light yield in the Focal Plane Detectors, design criteria for the Hodoscope for G0 backward and N to Delta transition measurements, the effect of removing detector segments on the backward angle measurement counting rates, and finally an overall simulation of performances of the CED-FPD and hodoscope systems in the backward angle measurements. Those reports, as well as others, can be downloaded at http://www.npl.uiuc.edu/exp/G0/docs/docs.html.
Participated in the microseismic seasonal variability measurements and gravity-gradient studies at Laser Interferometer Gravitational Wave Observatory (LIGO) at Livingston, Louisiana. Now involved in seismic data analysis.
Participate in multidisclipinary project through the work on the proposal for Center for Trenchless Infrastructure Systems to the NSF Division of Engineering Education and Centers. Working on the ability to predict the geotechnical, geomechanical and geoenvironmental properties of the sediments.
Worked on finalizing and publishing results from the experiments on pion - nucleus reaction channels obtained by the LADS-collaboration experiment using 4? detector system.
Co-principal investigator on several approved NSF Proposals.
Co-spokesperson on Thomas Jefferson National Accelerator Facility experimental proposal.

Publications

"A LARGE-AREA POSITION-SENSITIVE TIME-OF-FLIGHT COUNTER FOR ENERGETIC NEUTRONS AND CHARGED PARTICLES" S. Cierjacks, T. Petkovic, H. Ullrich, D. Gotta, S. Ljungfelt, N. Simicevic, M. Izycki, P. Weber, H. J. Weyer, Nucl. Instr. Meth. in Phys. Res. A 238, 354 (1985)
"OBSERVATION OF A QUASIFREE THREE-NUCLEON ABSORPTION MODE OF PIONS IN 4He" G. Backenstoss, M. Izycki, P. Salvisberg, M. Steinacher, P. Weber, H. J. Weyer, S. Cierjacks, B. Rzehorz, H. Ullrich, M. Furic, T. Petkovic, N. Simicevic, Physical Review Letters 59, 767 (1987).
"PION ABSORPTION IN 3He AND 4He NUCLEI" H. Ullrich, G. Backenstoss, M. Furic, A. Hoffart, M. Izycki, R. Powers, T. Petkovic, B. Rzehorz, P. Salvisberg, N. Simicevic, M. Steinacher, P. Weber, H. J. Weyer, Few-Body Systems, Suppl. 2, 459 (1987).
"TWO-NUCLEON ABSORPTION OF PI+ AND PI- ON 3He ACROSS THE DELTA-RESONANCE REGION" P. Weber, G. Backenstoss, M. Izycky, R. J. Powers, P. Salvisberg, M. Steinacher, H. J. Weyer, S. Cierjacks, A. Hoffart, H. Ullrich, M. Furic,, T. Petkovic, N. Simicevic, Nuclear Physics A 501, 765 (1989)
"CALCULATION OF DIFFERENTIAL CROSS SECTION FOR PION ABSORPTION ON DIPROTON" Damir Zucic and Neven Simicevic, Few-Body Systems 8, 95 (1990).
"LADS - LARGE ACCEPTANCE DETECTOR SYSTEM FOR PION-NUCLEUS REACTIONS" G. Backenstoss, et al. [LADS Collaboration], Nucl. Instr. Meth. in Phys. Res. A 310, 518 (1991)
"THREE-NUCLEON PROCESSES AND THE TOTAL PION ABSORPTION CROSS SECTION IN 3He" P. Weber, G. Backenstoss, M. Izycki, R. Powers, P. Salvisberg, M. Steinacher, H.J. Weyer, S. Cierjacks, A. Hoffart, B. Rzehorz, H. Ullrich, D. Bosnar, M. Furic, T. Petkovic, N. Simicevic, Nucl. Phys. A 534, 541 (1991)
"PION ABSORPTION IN TRITIUM AT INTERMEDIATE ENERGIES" P. Salvisberg, G. Backenstoss, H. Krause, R. J. Powers, M. Steinacher, H. J. Weyer, M. Wildi, A. Hoffart, B. Rzehorz, H. Ullrich, D. Bosnar, M. Furic, T. Petkovic, N. Simicevic, H. Zmeskal, A. Janett, R. H. Sherman, Physical Review C 46, 2172 (1992).
"EFFECT OF ISOSPIN ON THREE NUCLEON PION ABSORPTION IN LIGHT NUCLEI" Arthur Mateos and Neven Simicevic, Physical Review C 47, R1842 (1993).
"A LARGE SOLID ANGLE STUDY OF PION ABSORPTION ON 3He" T. Alteholz et al. [LADS Collaboration], Physical Review Letters 73, 1334 (1994).
"STATISTICAL MODEL OF THREE NUCLEON PION ABSORPTION" N. Simicevic, Physical Review C 50, 2224 (1994).
"ANGULAR DISTRIBUTIONS FOLLOWING THREE-NUCLEON PION ABSORPTION" N. Simicevic and A. Mateos, Physical Review C 51, 797 (1995).
"A LARGE ACCEPTANCE DETECTOR SYSTEM (LADS) FOR STUDIES OF PION ABSORPTION" T. Alteholz et al. [LADS Collaboration], Nucl. Instrum. Meth. A373, 374 (1996).
"CONTRIBUTION OF INITIAL STATE INTERACTIONS TO THE THREE NUCLEON ABSORPTION OF PIONS BY HE-3" G. Backenstoss et al [LADS Collaboration], Phys. Lett. B379, 60 (1996).
"EVIDENCE OF INITIAL STATE INTERACTIONS IN MULTINUCLEON PION ABSORPTION" D. Androic et al. [LADS Collaboration], Physical Review C53, R2591 (1996).
"PION ABSORPTION ON HE-3 AND HE-4 WITH EMISSION OF THREE ENERGETIC PROTONS" A. Lehmann et al. [LADS Collaboration], Physical Review C55, 2931 (1997).
"MEASUREMENT OF THE PROTON'S NEUTRAL WEAK MAGNETIC FORM – FACTOR" B. Mueller et al. [SAMPLE Collaboration], Physical Review Letters 78, 3824 (1997).
"MULTI - NUCLEON PION ABSORPTION ON HE-4 INTO THE P P P N FINAL STATE" A. Lehmann et al. [LADS Collaboration], Physical Review C56, 1872 (1997).
"INITIAL STATE INTERACTION IN THE (PI+,3P) REACTION ON N, AR AND XE" B. Kotlinski et al. [LADS Collaboration], Eur.Phys.J. Al, 435 (1998).
"MEASUREMENTS OF DEUTERON PHOTODISINTEGRATION UP TO 4.0-GEV" Bochna et al. [E89- 012 Collaboration], Phys. Rev. Lett. 81, 4576 (1998).
"TOTAL AND PARTIAL PION ABSORPTION CROSS SECTIONS ON HE-4 IN THE DELTA RESONANCE REGION" A.O. Mateos et al. [LADS Collaboration], Eur. Phys. J. Al, 435 (1998).
"TWO STEP PROCESSES IN PION SINGLE CHARGE EXCHANGE ON H-2 AT T(PI+) = 239-MEV" N.K. Gregory et al. [LADS Collaboration], Phys. Rev. C58, 3469 (1998).
"TOTAL CROSS-SECTIONS OF THE CHARGE EXCHANGE REACTION (PI+,PI0) ON H-2, HE-3, AND HE-4 ACROSS THE DELTA RESONANCE" A Lehmann et al. [LADS], Phys .Rev. C60, 024603 (1999).
"TIME-ZERO FISSION-FRAGMENT DETECTOR BASED ON LOW-PRESSURE MULTIWIRE PROPORTIONAL CHAMBERS" K. Assamagan, et al., Nucl. Instrum. Meth. A426, 405 (1999).
"PGR+ ABSORPTION ON N AND AR” D. Rowntree et al. [LADS Collaboration], Phys. Rev. C60, 054610 (1999).
"PION ABSORPTION IN HE-4" M. Planinic et al. [LADS Collaboration], Fizika B8, 113 (1999).
"COHERENT PI-0 PHOTOPRODUCTION ON THE DEUTERON UP TO 4-GEV" D.G. Meekins et al, Phys. Rev. C60, 052201 (1999).

any comments welcome

Last updated 6/17/00