Researchers Involved
Researchers Involved
Researchers Involved
Researchers Involved
Researchers Involved
Researchers Involved

 

DIANNA

(Direct Investigation of ann Assocation)

 

 

 

Overview
Overview

    A direct nn-scattering measurement is being performed with the use of thermal neutrons at the unique aperiodic pulsed reactor YAGUAR by a collaboration called DIANNA (Direct Investigation of ann Assocation).  The DIANNA includes nuclear physicists and engineers from Gettysburg College, the Joint Institute for Nuclear Research in Dubna, Russia, the Triangle Universities Nuclear Laboratory in Durham, North Carolina, and the Russian Federal Nuclear Center at the All-Russian Research Institute of Technical Physics in Snezhinsk, Russia. 

   

    Previous analyses of YAGUAR nn-experiments were performed assuming stationary conditions, that is, for fast neutron sources and thermal neutron densities that have already reached asymptotic values before any arbitrary time interval of interest. These early results have then provided input to additional Monte Carlo analytic codes that simulate the neutron-neutron scattering process.  However, the moderator response to an insertion of the fast neutrons is not prompt. What matters is, not only the time scale but possible changes of neutron spectra in space as well as, time during the transition state. To gain physical insight into such effects, we are developing a time-dependent source in MCNPX for the YAGUAR reactor geometry.

 

    In the summer of 2007 we fully incorporated the temporal dynamics of the neutron field on the scattering process.  A separate Monte Carlo code is was developed to use information from the field dynamics to calculate the nn-scattering rate and the detector counting rate as a function of

time. 

 

    In the summer of 2008 we analyzed the neutron background which was predicted to depend linearly on the neutron flux. The neutron-neutron signal should have a quadratic dependence, and therefore, variation in the pulse power of the reactor provides a mechanism for separating the signal from the background.  Initial measurements show a non-linear contribution to the background, which could be from both desorption in the aluminum vacuum pipe as well as physical movement of the moderator during the reactor pulse.  To study the background effects of various desorption processes, GEANT4 was used.  MCNPX was used to model the possible background effects of the moderator movement during the YAGUAR reactor pulse.  

 

 

 

 

Journal Publications 

 

Background determination for the neutron-neutron scattering experiment at the reactor YAGUAR

A. Yu. Muzichka, W.I. Furman, E.V. Lychagin, A. R. Krylov, G. V. Nekhaev, E. I. Sharapov, V. N. Shvetsov, A. V. Strelkov, B.G. Levakov, A.E. Lyzhin, Yu. I. Chernukhin, Ya. Z. Kandiev, C. R. Howell, G. E. Mitchell, B. E. Crawford, S. L. Stephenson, W. Tornow, Nuclear Physics A, 789 (2007) 30 -- 45.

 

Direct nn-scattering at the YAGUAR reactor

B. E. Crawford, W. I. Furman, C.R. Howell, E. V. Lychagin, B. G. Levakov, V. I. Litvin, A. E. Lyzhin, E. P. Magda, G. E. Mitchell, A. Yu. Muzichka, G. V. Nekhaev, E. I. Sharapov, V. N. Shvetsov, S. L. Stephenson, A. V. Strelkov, W. Tornow, Nuclear Instruments and Methods in Physics Research Section B, no. 241 (2005), 190.

 

Direct nn-scattering measurement with the pulsed reactor YAGUAR

G.E. Mitchell, W.I. Furman, E.V. Lychagin, A.Yu. Muzichka, G.V. Nekhaev, A.V. Strelkov, E.I. Sharapov, V.N. Shvetsov, Yu.I. Chernuhin, B.G. Levakov, V.I. Litvin,  A.E. Lyzhin, E.P. Magda,
 B.E. Crawford, S.L. Stephenson, C.R. Howell, and W. Tornow, Journal of  Research of NIST, 225 (2005).

 

Modeling fast neutron shielding for the nn-experiment

G.P. Gueorguiev, C.R. Howell, G.E. Mitchell, E.I. Sharapov, and W. Tornow, Accelerator Applications in a Nuclear Renaissance (American Nuclear Society, La Grange Park, Illinois, 2004), p. 53.

 

A Direct Measurement of the Neutron-Neutron Scattering Length

G. E. Mitchell, W. I. Furman, E. V. Lychagin, A. Yu. Muzichka, G. V. Nekhaev, A. V. Strelkov, E. I. Sharapov, V. N. Shvetsov, B. G. Levakov, V. I. Litvin, A. E. Lyzhin, E. P. Magda, B. E. Crawford, S. L. Stephenson, C. R. Howell, and W. Tornow, Brazilian Journal of Physics, no. 35 (2005), 850 – 853.

 

Direct nn-Scattering Measurement with the Pulsed Reactor YAGUAR

G. E. Mitchell, W. I. Furman, E. V. Lychagin, A.Yu. Muzichka, G. V. Nekhaev, A. V. Strelkov, E. I. Sharapov, V. N. Shvetsov, Yu. I. Chernuhin, B. G. Levakov, V. I. Litvin, A. E. Lyzhin, E. P. Magda, B. E. Crawford, S. L. Stephenson, C. R. Howell, andW. Tornow, Journal of Research of the National Institute of Standards and Technology, vol. 110 (2005), 225– 230.

 

Calculations of neutron spectra after neutron-neutron scattering

B. E. Crawford, S. L. Stephenson, C. R. Howell, G. E. Mitchell, W. Tornow, W. I. Furman, E. V. Lychagin, G. V. Nekhaev, A. V. Strelkov, E. I. Sharapov, V. N. Shvetsov, Journal of Physics G: Nuclear and Particle Physics, 30 (2004) 1269 – 1285.

 

Direct measurement of the neutron-neutron scattering cross section at the reactor

YAGUAR

W. I. Furman, E. V. Lychagin, A. Yu. Muzichka, G. V. Nekhaev, Yu.V. Safronov, A. V. Strelkov, E. I. Sharapov, V. N. Shvetsov, B. G. Levakov, V. I. Litvin, A. E. Lyzhin, E. P. Magda, C. R. Howell, G. E. Mitchell, W. Tornow, B. E. Crawford, S. L. Stephenson, and C. D. Bowman Journal of Physics G: Nuclear and Particle Physics, 28 (2002) 2627–2641.

 

Direct Measurement of the neutron-neutron scattering amplitude at the reactor YAGUAR

W.I. Furman, E.V. Lychagin,  A.Yu. Muzichka,  G.V. Nekhaev, A.V. Strelkov,  E.I. Sharapov, V.N. Shvetsov, B.G. Levakov, V.I. Litvin,  A.E. Lyzhin,  E.P. Magda,   C.R. Howell, G.E. Mitchell, W. Tornow, B.E. Crawford,  S.L. Stephenson, and  C.D. Bowman, J.Phys. G: Nucl. Part. Phys 28, 2627 (2002). 

 

A measurement of the absolute neutron beam polarization produced by an optically

pumped 3He neutron spin filter

D. R. Rich, J. D. Bowman, B. E. Crawford, P. P. J. Delheij, M. A. Espy, T. Haseyama, G. Jones, C. D. Keith, J. Knudson, M. B. Leuschner, A. Masaike, Y. Masuda, Y. Matsuda, S. I. Penttilä, V. R. Pomeroy, D. A. Smith, W. M. Snow, J. J. Szymanski, S. L. Stephenson, A. K. Thompson, and V. Yuan, Nuclear Instruments & Methods in Physics Research, Section A, 481 (2002) 431–453.

 

Parity violation in neutron resonances of palladium

D. A. Smith, J. D. Bowman, B. E. Crawford, C. A. Grossmann, T. Haseyama, A. Masaike, Y. Matsuda, G. E. Mitchell, S. I. Penttilä, N. R. Roberson, S. J. Seestrom, E. I. Sharapov, S. L. Stephenson, and V. W. Yuan, Physical Review C, 65 (2002) 035503/1–9.

 

Neutron Resonance spectroscopy of 104Pd, 105Pd, and 110Pd

D. A. Smith, J. D. Bowman, B. E. Crawford, C. A. Grossmann, T. Haseyama, A. Masaike, Y. Matsuda, G. E. Mitchell, S. I. Penttilä, N. R. Roberson, S. J. Seestrom, E. I. Sharapov, S. L. Stephenson, A. M. Sukhovoj, and V. W. Yuan, Physical Review C, 65 (2002) 024607/1–16.

 

Parity violation in neutron resonances of antimony and iodine

Y. Matsuda, J. D. Bowman, B. E. Crawford, P. P. J. Delheij, T. Haseyama, J. N. Knudson, L. Y. Lowie,

A. Masaike, Y. Masuda, G. E. Mitchell, S. I. Penttilä, H. Postma, N. R. Roberson, S. J. Seestrom, E. I. Sharapov, S. L. Stephenson, Y. -F. Yen, and V. W. Yuan, Physical Review C, 64 (2001) 015501/1–7.

 

 

Apparatus for Parity-Violation Study Via Capture Gamma-Ray Measurements

S. J. Seestrom, C. M. Frankle, J. D. Bowman, B. E. Crawford, Y. Haseyama, A. Masaike, A. Matsuda, S. I. Penttilä, N. R. Roberson, E. I. Sharapov, and S. L. Stephenson, Nuclear Instruments & Methods in Physics Research, Section A, 433 (1999) 603-613.

 

Parity Violation in Neutron Resonances of 103Rh

D. A. Smith, J. D. Bowman, B. E. Crawford, C. A. Grossmann, T. Haseyama, A. Masaike, Y. Matsuda, G. E. Mitchell, S.I. Penttilä, N. R. Roberson, S. J. Seestrom, E. I. Sharapov, S. L. Stephenson, and V.

W. Yuan, Physical Review C, 60 (1999) 045503/1-7

 

Neutron Resonance Spectroscopy of 103Rh from 30 eV to 2 keV

D. A. Smith, J. D. Bowman, B. E. Crawford, C. A. Grossmann, T. Haseyama, A. Masaike, Y. Matsuda, G. E. Mitchell, S. I. Penttilä, N. R. Roberson, S. J. Seestrom, E. I. Sharapov, S. L. Stephenson, and V. W. Yuan, Physical Review C, 60 (1999) 045502/1-11.

 

Parity Nonconservation in Neutron Resonances in 107;109Ag

L. Y. Lowie, J. D. Bowman, F. Corvi, B. E. Crawford, P. P. J. Delheij, C. Frankle, M. Iinuma, J. N. Knudson, A. Masaike, Y. Masuda, Y. Matsuda, G. E. Mitchell, S. Penttilä, H. Postma, N. R. Roberson, S. J. Seestrom, E. I. Sharapov, H. M. Shimizu, S. L. Stephenson, Y.-F. Yen, V. W. Yuan, and L. Zanini, Physical Review C, 59 (1999) 1119–1130.

 

Parity Nonconservation in Neutron Resonances in 133Cs

E. I. Sharapov, J. D. Bowman, B. E. Crawford, P. P. J. Delheij, T. Haseyama, J. N. Knudson, L. Y. Lowie, A. Masaike, Y. Masuda, Y. Matsuda, G. E. Mitchell, S. Penttilä, H. Postma, N. R. Roberson,

S. J. Seestrom, S. L. Stephenson, Y.-F. Yen, and V. W. Yuan, Physical Review C, 59 (1999) 1772–1779.

 

Search for Parity Violation in 93Nb Neutron Resonances

E. I. Sharapov, J. D. Bowman, B. E. Crawford, P. P. J. Delheij, C. Frankle, K. Fukuda, M. Iinuma, J. N. Knudson, S. J. Lokitz, L. Y. Lowie, A. Masaike, Y. Masuda, Y. Matsuda, G. E. Mitchell, S. Penttilä,

H. Postma, N. R. Roberson, S. J. Seestrom, H. M. Shimizu, S. L. Stephenson, Y-F Yen, V. W. Yuan, Physical Review C, 59 (1999) 1131–1135.

 

Neutron Resonance Spectroscopy of 117Sn from 1 eV to 1.5 keV

D. A. Smith, J. D. Bowman, B. E. Crawford, C. A. Grossmann, T. Haseyama, M. B. Johnson, A. Masaike, Y. Matsuda, G. E. Mitchell, V. A. Nazarenko, S. I. Penttilä, N. R. Roberson, S. J. Seestrom, E. I. Sharapov, L. M. Smotritsky, S. L. Stephenson, and V. W. Yuan, Physical Review C, 59 (1999) 2836–2843.

 

Parity Nonconservation in Neutron Capture on 113Cd

S. J. Seestrom, J. D. Bowman, B. E. Crawford, P. P. J. Delheij, C. M. Frankle, K. Fukuda, M. Iinuma, J. N. Knudson, P. E. Koehler, L. Y. Lowie, A. Masaike, Y. Masuda, Y. Matsuda, G. E. Mitchell, S. Penttilä, Yu. P. Popov, H. Postma, N. R. Roberson, E. I. Sharapov, H. M. Shimizu, S. L. Stephenson, Yi-Fen Yen, and V. W. Yuan, Physical Review C, 58 (1998) 2977–2985.

 

Parity Nonconservation in Neutron Resonances in 238U

B. E. Crawford, J. D. Bowman, P. P. J. Delheij, C.M. Frankle, M. Iinuma, J. N. Knudson, L. Y. Lowie, A. Masaike, Y. Matsuda, G. E. Mitchell, S. Penttilä, H. Postma, N. R. Roberson, S. J. Seestrom, E. I. Sharapov, S. L. Stephenson, Yi-Fen Yen, and V. W. Yuan, Physical Review C, 58 (1998) 1225–1235.

 

Neutron Resonance Spectroscopy of 106Pd, and 108Pd from 20–2000 eV

B. E. Crawford, J. D. Bowman, P. P. J. Delheij, T. Haseyama, J. N. Knudson, L. Y. Lowie, A. Masaike, Y. Matsuda, G. E. Mitchell, S. Penttilä, H. Postma, N. R. Roberson, S. J. Seestrom, E. I. Sharapov, S. L. Stephenson, and V. W. Yuan, Physical Review C, 58 (1998) 729–738.

 

Neutron Resonance Spectroscopy of 107Ag, and 109Ag

L. Y. Lowie, J. D. Bowman, B. E. Crawford, P. P. J. Delheij, T. Haseyama, J. N. Knudson, A. Masaike, Y. Masuda, Y. Matsuda, G. E. Mitchell, S. Penttilä, H. Postma, N. R. Roberson, S. J. Seestrom, E. I.

Sharapov, S. L. Stephenson, Y.-F. Yen, and V. W. Yuan, Physical Review C, 56 (1997) 90–97.

 

Observation of a Large Parity Non-conserving Eject in Xe

J. J. Szymanski, W. M. Snow, J. D. Bowman, B. Cain, B. E. Crawford, P. P. J. Delheij, R. D. Hartman, T. Haseyama , C. D. Keith, J. N. Knudson, A. Komives, M. Leuschner, L. Y. Lowie, A. Masaike, Y.Matsuda, G. E. Mitchell, S. I. Penttilä, H. Postma, D. Rich, N. R. Roberson, S. J. Seestrom, E. I. Sharapov, S. L. Stephenson,Yi-Fen Yen, and V. W. Yuan, Physical Review C, 53 (1996) R2576–R2580.

 

Parity Violation in Neutron-Nucleus Scattering

G. E. Mitchell, J. D. Bowman, B. E. Crawford, P. P. J. Delheij, C. M. Frankle, K. Fukuda, C. R. Gould, A. A. Green, D. G. Haase, M. Iinuma, J. N. Knudson, L. Y. Lowie, A. Masaike, Y. Masuda, Y. Matsuda, S. Penttilä, H. Postma, N. R. Roberson, S. J. Seestrom, E. I. Sharapov, H. M. Shimizu, S. L. Stephenson, Yi-Fen Yen, and V. W. Yuan, Nuclear Data for Science, and Technology, ed. J. K. Dickens (American Nuclear Society, La Grange Park, 1994) 208–214.

 

 

 

 

 

 

 

 

 

Pictures
Publications

 

 

This project was made possible by funding from the National Science Foundation under Grant No. 0555602. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

 

Sharon Stephenson

Bret Crawford

 

Gettysburg Physics

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This project was made possible by funding from the National Science Foundation under Grant No. 0555602. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

This project was made possible by funding from the National Science Foundation under Grant No. 0555602. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

This project was made possible by funding from the National Science Foundation under Grant No. 0555602. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

This project was made possible by funding from the National Science Foundation under Grant No. 0555602. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

This project was made possible by funding from the National Science Foundation under Grant No. 0555602. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

This project was made possible by funding from the National Science Foundation under Grant No. 0555602. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

 

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  Publications

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detailed map of YAGUAR reactor and it's components

 

 

 

 

Actual picture of the YAGUAR reactor in Snezhinsk, Russia

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Model of an isotropic source of neutrons within the active core of  the YAGUAR reactor geometry created with MCNPX
An isotropic source of neutrons (aproximately 1,000,000 particles) within the active core of the YAGUAR reactor with an invisible geometry

Only a small amount of neutrons actually collide and make it to the detector
isotropic point source of neutrons

The the pink and purple is the YAGUAR reactor geometry created by students (summer 2007) using MCNPX and visualized using IVIPP

Conference Proceedings and Talks

Posters 

 

DIANNA: Modeling the time dependence of the YAGUAR reactor pulse

D. Kawamura, M.R. Schmidt, D.A. Yager-Elorriaga, B.E. Crawford, S.L. Stephenson, Division of Nuclear Physics 2007 Meeting, http://absimage.aps.org/image/MWS_DNP07-2007-020059.pdf

 

Modeling a Carbon Diagnostic System Using MCNPX

S.H. Fay, C.M. Kuhn, E.E. Smith, S.L. Stephenson , T.C. Sangster, V. Glebov, S.J. Padalino, Division of Nuclear Physics 2007 Meeting, http://meetings.aps.org/Meeting/DNP07/Event/71572

 and the Division of Plasma Physics 2007 Meeting, http://meetings.aps.org/Meeting/DPP07/Event/70485

 

Modeling a Graphite Diagnostic System using MCNPX

J. Deaven, S.L. Stephenson, S.J. Padalino, V. Yu. Glebov, T.C. Sangster, Division of Plasma Physics 2006 Meeting, http://‡ux.aps.org/meetings/baps…les/all_DPP06.pdf

 and the Division of Nuclear Physics 2006 Meeting, http://‡ux.aps.org/ meetings/baps…les/DNP06.pdf

 

 

 

 

 

Reactor YAGUAR as a pulsed source for a direct nn-scattering measurement

G. E. Mitchell, C. D. Bowman, Yu. I. Chernuhin, B. E. Crawford, W. I. Furman, C. R. Howell,

B. G. Levakov, V. I. Litvin, E. P. Magda, A. Yu. Muzichka, G. V. Nekhaev, Yu. V. Safronov, E. V. Lychagin, A. E. Lyzhin, V. N. Shvetsov, S. L. Stephenson, A. V. Strelkov, E. I. Sharapov, and W. Tornow, Proceedings of ICANS-XVII: The 17th Meeting of the International Collaboration on Advanced Neutron Sources, (2006) 888 –

 

An Approach to the Spatial-Temporal Analysis of the n – n Collision Rate in the

Yaguar Experiment

E. I. Sharapov, W. I. Furman, E. V. Lychagin, A. Yu. Muzichka, G. V. Nekhaev, V. N. Shvetsov, A. V. Strelkov, G. E. Mitchell, B. E. Crawford, S. L. Stephenson, C. R. Howell, and W. Tornow, to be published in the Proceedings of XIII International Seminar on Interactions of Neutrons with Nuclei, Dubna, Russia (2006)

 

A Direct Measurement of the Neutron-Neutron Scattering Length

G. E. Mitchell, W. I. Furman, E. V. Lychagin, A. Yu. Muzichka, G. V. Nekhaev, A. V. Strelkov, E. I.

Sharapov, V. N. Shvetsov, B. G. Levakov, V. I. Litvin, A. E. Lyzhin, E. P. Magda, B. E. Crawford, S. L. Stephenson, C. R. Howell, and W. Tornow; to be published in the Proceedings of the 17th annual meeting of the International Collaboration on Advanced Neutron Sources, Sante Fe, (2005).

 

Modeling of the Neutron Field and Count Rates for the NN-experiment

G.E. Mitchell, C.D. Bowman,  B.E. Crawford, C.B. Dallas,   W.I. Furman,   C.R. Howell,  B.G. Levakov, V.I. Litvin,  E.V. Lychagin, A.E. Lyzhin, E.P. Magda, M.E. Morris,  A.Yu. Muzichka, G.V. Nekhaev, Yu.V. Safronov, E.I. Sharapov, V.N. Shvetsov, S.L. Stephenson, A.V. Strelkov, and W. Tornow, International Conference on Nuclear-pumped Lasers and Pulse Reactors (Russian Federal Nuclear Center -- All-Russian Scientific Research Institute of Technical Physics, Snezhinsk, Russia, 2004), p. 632.

 

Direct nn scattering measurement with the pulsed reactor YAGUAR

G.E. Mitchell, Rez Institute of Nuclear Physics, Rez, Czech Republic,2004.

 

Calculations of neutron velocity and time-of-flight spectra in the DIANNA nn scattering experiment, XII  International seminar on interaction of neutrons with nuclei, Joint Institute for Nuclear Research, Dubna, 2004.

 

Background conditions of nn experiment at reactor YAGUAR,

XII  International seminar on interaction of neutrons with nuclei, Joint Institute for Nuclear Research, Dubna, 2004.

 

Direct nn scattering at the YAGUAR reactor

B.E. Crawford, 17th international conference on the application of accelerators in research and industry, Denton, TX, 2004

 

Direct nn scattering measurement with the pulsed reactor YAGUAR

G.E. Mitchell, Precision measurements with slow neutrons, Gaithersburg, MD, 2004.

 

Direct measurement of the neutron neutron scattering length

G.E. Mitchell, Universidade Sao Paulo, Sao Paulo, Brazil, 2004.

 

 

Current status of nn experiment at YAGUAR

W.I. Furman, Triangle Universities Nuclear Laboratory, Durham, NC. 2004.

 

 

A general description of the neutron neutron scattering experiment

V.N. Shvetsov, XIIIth International conference on selected problems of modern physics, Dubna, Russia, 2003.

 

 

Current Condition of the Experimental Project on the Direct Measurement of Neutron Scattering Length on the YAGUAR Pulsed Reactor

E.I. Sharapov, C.D. Bowman,  B.E. Crawford, W.I. Furman, C.R. Howell,  B.G. Levakov, V.I. Litvin,  E.V. Lychagin, A.E. Lyzhin, E.P. Magda, G.E. Mitchell, A.Yu. Muzichka, G.V. Nekhaev,
Yu.V. Safronov,   V.N. Shvetsov, S.L. Stephenson, A.V. Strelkov, and W. Tornow, International Conference on Nuclear-pumped Lasers and Pulse Reactors (Russian Federal Nuclear Center -- All-Russian Scientific Research Institute of Technical Physics, Snezhinsk, Russia, 2004), p. 644.

 

Modeling fast neutron shielding for the nn  experiment

G.P. Gueorguiev. Accelerator applications '03 Conference, San Diego, CA, 2003.

 

Modeling the detector count rates in the YAGUAR nn-scattering experiment

B. E. Crawford, C. D. Bowman, C. B. Dallas, W. I. Furman, J. R. Greece, C. R. Howell, B.G. Levakov, V. I. Litvin, E. V. Lychagin, A. E. Lyzhin, E. P. Magda, G. E. Mitchell, M. E. Morris, A. Yu. Muzichka, G. V. Nekhaev, Yu. V. Safronov, E. I. Sharapov, V. N. Shvetsov, S. L. Stephenson, A. V. Strelkov, and W. Tornow, Xth International Seminar on Interaction of Neutrons with Nuclei, ISINN-X, (Joint Institute for Nuclear Research, Dubna, Russia, 2003), p. 436–446.

 

Direct measurement of the neutron-neutron scattering length

G.E. Mitchell, Technical University Darmstadt, Darmstadt, Germany,2003.

 

 

Direct Measurement of Neutron-Neutron Scattering

E.I. Sharapov,    C.D. Bowman,   B.E. Crawford, W.I. Furman,   C.R. Howell,  B.G. Levakov, V.I. Litvin,  E.V. Lychagin, A.E. Lyzhin, E.P. Magda, G.E. Mitchell, A.Yu. Muzichka, G.V. Nekhaev,
Yu.V. Safronov,   V.N. Shvetsov, S.L. Stephenson, A.V. Strelkov, and W. Tornow, Application of
Accelerators in Research and Industry: Seventeenth International Conference, eds. J.L. Duggan and I.L. Morgan (AIP Conference Proceedings 680, Melville, New York, 2003), p. 261.

 

Detector couint rates in the YAGUAR nn-scattering experiment
B.E. Crawford, C.D. Bowman,  C.B. Dallas, W.I. Furman,  J.R. GReece, C.R. Howell, B.G. Levakov,
V.I. Litvin,  A.E. Lyzhin, E.V. Lychagin, E.P. Magda, G.E. Mitchell, M.E. Morris,  A.Yu. Muzichka,  G.V. Nekhaev, Yu.V. Safronov,  E.I. Sharapov, V.N. Shvetsov,  S.L. Stephenson, A.V. Strelkov, and W. Tornow, X International Seminar on Interactions of Neutrons with Nuclei, ISINN-10,  (Joint Institute of Nuclear Physics, Dubna, 2003), p. 436.

 

Current Status of the Proposal for the Direct Measurement of the Neutron-Neutron

Scattering Length at the Reactor YAGUAR

W. I. Furman, E. V. Lychagin, A. Yu. Muzichka,G. V. Nekhaev, A. V. Strelkov, E. I. Sharapov, V. N. Shvetsov, B.G. Levakov, V. I. Litvin, A. E. Lyzhin, C. R. Howell, G. E. Mitchell, W. Tornow, C. D. Bowman, B. E. Crawford, C. B. Dallas, J. R. Greece, M. E. Morris, and S. L. Stephenson, Xth

International Seminar on Interaction of Neutrons with Nuclei, ISINN-X, (Joint Institute for Nuclear Research, Dubna, Russia, 2003), p. 410–426.

 

Current Condition of the Experimental Project on the Direct Measurement of Neutron

Scattering Length on the YAGUAR Pulsed Reactor

G. E. Mitchell for the DIANNA Collaboration (including S. L. Stephenson), in IIIrd International Conference on Nuclear-pumped Lasers and Pulse Reactor s, Snezhinsk, Russia (2003), pp. 644.

 

Modeling of the Neutron Field and Count Rate for the NN-Experiment

G. E. Mitchell for the DIANNA Collaboration (including S. L. Stephenson), in IIIrd International Conference on Nuclear-pumped Lasers and Pulse Reactors, Snezhinsk, Russia (2003), pp.

632.

Monte Carlo modeling of the neutron field inside the YAGUAR through channel

S. L. Stephenson, C. D. Bowman, B. E. Crawford, C. B. Dallas, W. I. Furman, C. R. Howell, B. G. Levakov, V. I. Litvin, E. V. Lychagin, A. E. Lyzhin, E. P. Magda, G. E. Mitchell, M. E. Morris, A. Yu. Muzichka, G. V. Nekhaev, Yu. V. Safronov, E. I. Sharapov, V. N. Shvetsov, A. V. Strelkov, and W. Tornow , X th International Seminar of Neutrons with Nuclei, ISINN-X, (Joint Institute for Nuclear Research, Dubna, Russia, 2003), p. 427–435.

 

The reactor YAGUAR pulse shape and neutron density measurements

W.I. Furman, X International seminar on interaction of neutrons with nuclei, Joint Institute for Nuclear Research, Dubna, 2002.

 

 

Collision Rate in the Proposed nn-scattering Experiment at the Reactor YAGUAR

S. L. Stephenson, B. E. Crawford, C. D. Bowman, W. Tornow, A. Yu. Muzichka and E. I Sharapov, IXth International Seminar on Interaction of Neutrons with Nuclei, (Joint Institute for Nuclear Research, Dubna, Russia, 2001) p. 84–92.

 

Thermal neutron fluxes at the reactor YAGUAR for the NN-scattering experiment

B. G. Levakov, V. I. Litvin, A. E. Lyzhin, W. I. Furman, E. V. Lychagin, A. Yu. Muzichka, G. V. Nekhaev, A. V. Strelkov, E. I. Sharapov, V. N. Shvetsov, C. R. Howell, G. E. Mitchell, W. Tornow, C. D. Bowman, B. E. Crawford, and S. L. Stephenson, IXth International Seminar on Interaction of Neutrons with Nuclei (Joint Institute for Nuclear Research, Dubna, 2001), p. 27–32.

 

 

Prospects for a direct measurement of the neutron-neutron scattering cross section at the pulsed reactor YAGUAR.

C.D. Bowman, Yu.I. Chernuhin,   B.G. Levakov, A.E. Lyzhin,  E.V. Lychagin, E.P. Magda,  A.Yu. Muzichka, G.V. Nekhaev,  A.V. Strelkov, E.I. Sharapov, V.N. Shvetsov, VIII International Seminar on Interactions of Neutrons with Nuclei, ISINN-8,  Joint Institute of Nuclear Physics,Dubna, 2000, p. 245.

 

Modeling  the YAGUAR Reactor Neutron Field and Detector Count Rates for the Direct ann experiment

B.E. Crawford, C.D. Bowman, W.I. Furman, C.R. Howell, B.G. Levakov, V.I. Litvin,  E.V. Lychagin, A.E. Lyzhin, E.P. Magda, G.E. Mitchell, A.Yu. Muzichka, G.V. Nekhaev, Yu.V. Safronov, E.I. Sharapov, V.N. Shvetsov, S.L. Stephenson, A.V. Strelkov, and W. Tornow, Few-Body Problems
  in Physics, ed. W. Glockle  and W. Tornow (Elsevier, Amsterdam, The Netherlands) S178.

Publications

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Researchers Involved

    Currently six Gettysburg College researchers are members of DIANNA:  faculty members Bret Crawford and Sharon Stephenson, Ca'trish Pagan ('09), Richard Showalter-Bucher ('10), Melissa Schmidt ('09), and David Yager-Elorriaga ('10).  Past students include Daiji Kawamura (currently pursuing a MS at Rochester Institute of Technology), Marc Morris (currently finishing his Ph.D. at the University of Washington in biophysics) and Cory Dallas (medical physicist in Minneapolis), Christy Zuidema (Knowles Science Teaching Fellow in the MAT program at Towson University).