M Yurov

Publications (16)16.93 Total impact

• Article: Optical Pumping Spin Exchange 3He Gas Cells for Magnetic Resonance Imaging

  W. Kim, S. S. Stepanyan, A. Kim, Y. Jung, S. Woo, M. Yurov, J. Jang
  [show abstract] [hide abstract]
  ABSTRACT: We present a device for spin‐exchange optical pumping system to produce large quantities of polarized noble gases for Magnetic Resonance Imaging (MRI). A method and design of apparatus for pumping the polarization of noble gases is described. The method and apparatus enable production, storage and usage of hyperpolarized noble gases for different purposes, including Magnetic Resonance Imaging of human and animal subjects. Magnetic imaging agents breathed into lungs can be observed by the radio waves of the MRI scanner and report back physical and functional information about lung’s health and desease. The technique known as spin exchange optical pumping is used. Nuclear magnetic resonance is implemented to measure the polarization of hyperpolarized gas. The cells prepared and sealed under high vacuum after handling Alkali metals into the cell and filling with the 3He‐N2 mixture. The cells could be refilled. The 3He reaches around 50% polarization in 5–15 hours.
  AIP Conference Proceedings. 08/2009; 1149(1):833-836.
• Source

  Available from: W. J. Briscoe

  Article: Precise measurement of the neutron magnetic form factor G(M)n in the few-GeV2 region.

  J Lachniet, A Afanasev, H Arenhövel, W K Brooks, G P Gilfoyle, D Higinbotham, S Jeschonnek, B Quinn, M F Vineyard, G Adams, [......], M Williams, E Wolin, M H Wood, A Yegneswaran, J Yun, M Yurov, L Zana, J Zhang, B Zhao, Z W Zhao
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  ABSTRACT: The neutron elastic magnetic form factor was extracted from quasielastic electron scattering on deuterium over the range Q;{2}=1.0-4.8 GeV2 with the CLAS detector at Jefferson Lab. High precision was achieved with a ratio technique and a simultaneous in situ calibration of the neutron detection efficiency. Neutrons were detected with electromagnetic calorimeters and time-of-flight scintillators at two beam energies. The dipole parametrization gives a good description of the data.
  Physical Review Letters 06/2009; 102(19):192001. · 7.37 Impact Factor
• Article: Measurement of direct f0(980) photoproduction on the proton.

  M Battaglieri, R De Vita, A P Szczepaniak, K P Adhikari, M Aghasyan, M J Amaryan, P Ambrozewicz, M Anghinolfi, G Asryan, H Avakian, [......], D P Weygand, M Williams, E Wolin, M H Wood, A Yegneswaran, M Yurov, L Zana, J Zhang, B Zhao, Z W Zhao
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  ABSTRACT: We report on the results of the first measurement of exclusive f_{0}(980) meson photoproduction on protons for E_{gamma}=3.0-3.8 GeV and -t=0.4-1.0 GeV2. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. The resonance was detected via its decay in the pi;{+}pi;{-} channel by performing a partial wave analysis of the reaction gammap-->ppi;{+}pi;{-}. Clear evidence of the f_{0}(980) meson was found in the interference between P and S waves at M_{pi;{+}pi;{-}} approximately 1 GeV. The S-wave differential cross section integrated in the mass range of the f_{0}(980) was found to be a factor of about 50 smaller than the cross section for the rho meson. This is the first time the f_{0}(980) meson has been measured in a photoproduction experiment.
  Physical Review Letters 04/2009; 102(10):102001. · 7.37 Impact Factor
• Article: Exclusive ρ0 electroproduction on the proton at CLAS

  The CLAS Collaboration, S. A. Morrow, M. Guidal, M. Garçon, J. M. Laget, E. S. Smith, G. Adams, K. P. Adhikari, M. Aghasyan, M. J. Amaryan, [......], D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, M. Yurov, L. Zana, J. Zhang, B. Zhao, Z. W. Zhao
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  ABSTRACT: The ep → e ′ pρ0 reaction has been measured using the 5.754GeV electron beam of Jefferson Lab and the CLAS detector. This represents the largest ever set of data for this reaction in the valence region. Integrated and differential cross-sections are presented. The W , Q2 and t dependences of the cross-section are compared to theoretical calculations based on the t -channel meson-exchange Regge theory, on the one hand, and on quark handbag diagrams related to Generalized Parton Distributions (GPDs) on the other hand. The Regge approach can describe at the » \approx 30% level most of the features of the present data while the two GPD calculations that are presented in this article which succesfully reproduce the high-energy data strongly underestimate the present data. The question is then raised whether this discrepancy originates from an incomplete or inexact way of modelling the GPDs or the associated hard scattering amplitude or whether the GPD formalism is simply inapplicable in this region due to higher-twists contributions, incalculable at present.
  European Physical Journal A 12/2008; 39(1):5-31. · 2.19 Impact Factor
• Article: First measurement of target and double spin asymmetries for e⃗p⃗→epπ0 in the nucleon resonance region above the Δ(1232)

  A. S. Biselli, V. D. Burkert, M. J. Amaryan, G. Asryan, H. Avakian, H. Bagdasaryan, N. Baillie, J. P. Ball, N. A. Baltzell, M. Battaglieri, [......], D. P. Weygand, M. Williams, E. Wolin, M. H. Wood, A. Yegneswaran, M. Yurov, L. Zana, J. Zhang, B. Zhao, Z. W. Zhao
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  ABSTRACT: The exclusive channel p⃗(e⃗,e'p)π0 was studied in the first and second nucleon resonance regions in the Q2 range from 0.187 to 0.770 GeV2 at Jefferson Lab using the CEBAF Large Acceptance Spectrometer. Longitudinal target and beam-target asymmetries were extracted over a large range of center-of-mass angles of the π0 and compared to the unitary isobar model MAID, the dynamic model by Sato and Lee, and the dynamic model DMT. A strong sensitivity to individual models was observed, in particular for the target asymmetry and in the higher invariant mass region. This data set, once included in the global fits of the above models, is expected to place strong constraints on the electrocoupling amplitudes A1/2 and S1/2 for the Roper resonance N(1400)P11 and the N(1535)S11 and N(1520)D13 states.
  Phys. Rev. C. 10/2008; 78(4).
• Article: Cross sections and beam asymmetries for e⃗p→enπ+ in the nucleon resonance region for 1.7⩽Q2⩽4.5 GeV2

  K. Park, V. D. Burkert, W. Kim, I. G. Aznauryan, R. Minehart, L. C. Smith, K. Joo, L. Elouadrhiri, G. Adams, M. J. Amaryan, [......], E. Wolin, M. H. Wood, A. Yegneswaran, J. Yun, M. Yurov, L. Zana, B. Zhang, J. Zhang, B. Zhao, Z. W. Zhao
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  ABSTRACT: The exclusive electroproduction process e⃗p→e'nπ+ was measured in the range of the photon virtuality Q2=1.7-4.5 GeV2, and the invariant mass range for the nπ+ system of W=1.15-1.7 GeV using the CEBAF Large Acceptance Spectrometer. For the first time, these kinematics are probed in exclusive π+ production from protons with nearly full coverage in the azimuthal and polar angles of the nπ+ center-of-mass system. The nπ+ channel has particular sensitivity to the isospin ½ excited nucleon states, and together with the pπ0 final state will serve to determine the transition form factors of a large number of resonances. The largest discrepancy between these results and present modes was seen in the σLT' structure function. In this experiment, 31,295 cross section and 4,184 asymmetry data points were measured. Because of the large volume of data, only a reduced set of structure functions and Legendre polynomial moments can be presented that are obtained in model-independent fits to the differential cross sections.
  Phys. Rev. C. 01/2008; 77(1).
• Source

  Available from: G. Gervino

  Article: Evidence for a narrow structure at W~1.68 GeV in eta photoproduction on the neutron

  V Kuznetsov, S. Churikova, G. Gervino, F. Ghio, B Girolami, D. Ivanov, J. Jang, A Kim, W Kim, A. Ni, Yu. Vorobiev, M Yurov, A. Zabrodin
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  ABSTRACT: New results on quasi-free $\eta$ photoproduction on the neutron and proton bound in a deuteron target are presented. The $\gamma n \to \eta n$ quasi-free cross section reveals a bump-like structure which is not seen in the cross section on the proton. This structure may signal the existence of a relatively narrow ($M\sim 1.68$ GeV, $\Gamma \leq 30$ MeV) baryon state.
  07/2006;
• Source

  Available from: Eugene Pasyuk

  Article: First measurement of target and double spin asymmetries for ep -> ep pi(0) in the nucleon resonance region above the Delta(1232)

  AS Biselli, VD Burkert, MJ Amaryan, G Asryan, H Avakian, H Bagdasaryan, N Baillie, JP Ball, NA Baltzell, M Battaglieri, [......], DP Weygand, M Williams, E Wolin, MH Wood, A Yegneswaran, M Yurov, L Zana, J Zhang, B Zhao, ZW Zhao
  Michael Williams.
• Article: Cross sections and beam asymmetries for (e)over-right-arrowp -> en pi(+) in the nucleon resonance region for 1.7 <= Q(2)<= 4.5 GeV2

  K Park, VD Burkert, W Kim, IG Aznauryan, R Minehart, LC Smith, K Joo, L Elouadrhiri, G Adams, MJ Amaryan, [......], E Wolin, MH Wood, A Yegneswaran, J Yun, M Yurov, L Zana, B Zhang, J Zhang, B Zhao, ZW Zhao
  Michael Williams.
• Article: Exclusive rho(0) electroproduction on the proton at CLAS

  SA Morrow, M Guidal, M Garcon, JM Laget, ES Smith, G Adams, KP Adhikari, M. Aghasyan, MJ Amaryan, M Anghinolfi, [......], DP Weygand, M Williams, E Wolin, MH Wood, A Yegneswaran, M Yurov, L Zana, J Zhang, B Zhao, ZW Zhao
  Michael Williams.
• Article: Measurement of Direct f(0)(980) Photoproduction on the Proton

  M Battaglieri, R De Vita, AP Szczepaniak, KP Adhikari, M. Aghasyan, MJ Amaryan, P Ambrozewicz, M Anghinolfi, G Asryan, H Avakian, [......], DP Weygand, M Williams, E Wolin, MH Wood, A Yegneswaran, M Yurov, L Zana, J Zhang, B Zhao, ZW Zhao
  Michael Williams.
• Article: Precise Measurement of the Neutron Magnetic Form Factor G(M)(n) in the Few-GeV2 Region

  J Lachniet, A. Afanasev, H Arenhovel, WK Brooks, GP Gilfoyle, D. Higinbotham, S Jeschonnek, B Quinn, MF Vineyard, G Adams, [......], M Williams, E Wolin, MH Wood, A Yegneswaran, J Yun, M Yurov, L Zana, J Zhang, B Zhao, ZW Zhao
  Michael Williams.
• Source

  Available from: Eugene Pasyuk

  Article: Beam spin asymmetries in deeply virtual Compton scattering (DVCS) with CLAS at 4.8 GeV

  G Gavalian, VD Burkert, L Elouadrhiri, M Holtrop, S Stepanyan, D Abrahamyan, G Adams, MJ Amaryan, P Ambrozewicz, M Anghinolfi, [......], M Williams, E Wolin, MH Wood, A Yegneswaran, J Yun, M Yurov, L Zana, J Zhang, B Zhao, ZW Zhao
  Michael Williams.
• Source

  Available from: Nevzat Guler

  Article: Electroexcitation of the Roper resonance for 1.7 < Q(2)< 4.5 GeV2 in ep -> en pi(+)

  IG Aznauryan, VD Burkert, W Kim, K Park, G Adams, MJ Amaryan, P Ambrozewicz, M Anghinolfi, G Asryan, H Avakian, [......], E Wolin, MH Wood, A Yegneswaran, J Yun, M Yurov, L Zana, B Zhang, J Zhang, B Zhao, ZW Zhao
  Michael Williams.
• Article: Electroproduction of phi(1020) mesons at 1.4 <= Q(2) <= 3.8 GeV2 measured with the CLAS spectrometer

  JP Santoro, ES Smith, M Garcon, M Guidal, JM Laget, C Weiss, G Adams, MJ Amaryan, M Anghinolfi, G Asryan, [......], DP Weygand, M Williams, E Wolin, MH Wood, A Yegneswaran, M Yurov, L Zana, J Zhang, B Zhao, ZW Zhao
  Michael Williams.
• Source

  Available from: G. Gervino

  Article: Evidence for a narrow structure at W∼1.68 GeV in η photoproduction off the neutron

  V. Kuznetsov, S. Churikova, G. Gervino, F. Ghio, B. Girolami, D. Ivanov, J. Jang, A. Kim, W. Kim, A. Ni, Yu. Vorobiev, M. Yurov, A. Zabrodin
  [show abstract] [hide abstract]
  ABSTRACT: New results on quasi-free η photoproduction on the neutron and proton bound in a deuteron target are presented. The γn→ηn quasi-free cross section reveals a bump-like structure which is not seen in the cross section on the proton. This structure may signal the existence of a relatively narrow (M∼1.68 GeV, Γ⩽30 MeV) baryon state.
  Physics Letters B.