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Featured researches published by J. Reinhold.


Physical Review Letters | 2005

Precision Rosenbluth measurement of the proton elastic form factors

I. A. Qattan; J. Arrington; R. E. Segel; X. Zheng; K. A. Aniol; Oliver Keith Baker; R. Beams; E. J. Brash; J. R. Calarco; A. Camsonne; J. P. Chen; M. E. Christy; D. Dutta; R. Ent; S. Frullani; D. Gaskell; O. Gayou; R. Gilman; C. Glashausser; K. Hafidi; J.-O. Hansen; D. W. Higinbotham; W. Hinton; R. J. Holt; Günter Huber; H. Ibrahim; L. Jisonna; M. K. Jones; C. Keppel; E. Kinney

We report the results of a new Rosenbluth measurement of the proton electromagnetic form factors at Q2 values of 2.64, 3.20, and 4.10 GeV2. Cross sections were determined by detecting the recoiling proton, in contrast to previous measurements which detected the scattered electron. Cross sections were determined to 3%, with relative uncertainties below 1%. The ratio mu(p)G(E)/G(M) was determined to 4%-8% and showed mu(p)G(E)/G(M) approximately 1. These results are consistent with, and much more precise than, previous Rosenbluth extractions. They are inconsistent with recent polarization transfer measurements of similar precision, implying a systematic difference between the techniques.


Science | 2008

Probing Cold Dense Nuclear Matter

R. Subedi; R. Shneor; P. Monaghan; B. D. Anderson; K. A. Aniol; J. R. M. Annand; J. Arrington; H. Benaoum; F. Benmokhtar; W. Boeglin; J. P. Chen; Seonho Choi; E. Cisbani; B. Craver; S. Frullani; F. Garibaldi; S. Gilad; R. Gilman; O. Glamazdin; J. O. Hansen; D. W. Higinbotham; T. Holmstrom; H. Ibrahim; R. Igarashi; C. W. de Jager; E. Jans; X. Jiang; L. J. Kaufman; A. Kelleher; A. Kolarkar

The protons and neutrons in a nucleus can form strongly correlated nucleon pairs. Scattering experiments, in which a proton is knocked out of the nucleus with high-momentum transfer and high missing momentum, show that in carbon-12 the neutron-proton pairs are nearly 20 times as prevalent as proton-proton pairs and, by inference, neutron-neutron pairs. This difference between the types of pairs is due to the nature of the strong force and has implications for understanding cold dense nuclear systems such as neutron stars.


Physical Review Letters | 1998

Measurements of Deuteron Photodisintegration up to 4.0 GeV

C. Bochna; B. Terburg; D. Abbott; Abdellah Ahmidouch; C. S. Armstrong; J. Arrington; K. A. Assamagan; Oliver Keith Baker; S. Barrow; D. Beatty; D. Beck; S. Beedoe; E. J. Beise; J. E. Belz; P. Bosted; E. J. Brash; H. Breuer; R. V. Cadman; L. Cardman; R. Carlini; J. Cha; N. S. Chant; C. Cothran; W. J. Cummings; S. Danagoulian; F. Duncan; James Dunne; D. Dutta; T. Eden; R. Ent

The first measurements of the differential cross section for the d(γ,p)n reaction up to 4.0 GeV were performed at the Continuous Electron Beam Accelerator Facility (CEBAF) at Thomas Jefferson Laboratory. We report the cross sections at the proton center-of-mass angles of 36°, 52°, 69°, and 89°. These results are in reasonable agreement with previous measurements at lower energy. The 89° and 69° data show constituent-counting-rule behavior up to 4.0 GeV photon energy. The 52° and 36° data disagree with the counting-rule behavior. The quantum chromodynamics (QCD) model of nuclear reactions involving reduced amplitudes disagrees with the present data.


European Physical Journal A | 1994

Production and identification of100Sn

R. Schneider; J. Friese; J. Reinhold; K. Zeitelhack; T. Faestermann; R. Gernhuser; H. Gilg; F. Heine; J. Homolka; P. Kienle; H. J. Krner; H. Geissel; G. Mnzenberg; K. Smmerer

We report the first observation of the doubly-magic nucleus100Sn. This isotope was produced by nuclear fragmentation of124Xe projectiles at 1095 A·MeV using the heavy-ion synchrotron SIS at GSI, Darmstadt. The projectile fragments were separated in flight with the projectile-fragment separator FRS and identified by measuring event by event the magnetic rigidity, the time of flight and the energy deposition.


Physics Letters B | 2011

High-precision measurement of the proton elastic form factor ratio mu_pG_E/G_M at low Q^2.

X. Zhan; A. Rakhman; J. Glister; A. J. Sarty; B. Sawatzky; R. Subedi; R. J. Holt; B. E. Norum; Y. Qiang; J. Arrington; Y. Zhang; S. May-Tal Beck; R. D. Ransome; M. Shabestari; R. Gilman; C. Dutta; K. Chirapatpimol; K. Hafidi; E. Fuchey; J.-O. Hansen; K. Allada; E. Schulte; E. Piasetzky; D. Protopopescu; S. Strauch; P. Reimer; E. Chudakov; A. Shahinyan; R. De Leo; Günter Huber

Abstract We report a new, high-precision measurement of the proton elastic form factor ratio μ p G E / G M for the four-momentum transfer squared Q 2 = 0.3 – 0.7 ( GeV / c ) 2 . The measurement was performed at Jefferson Lab (JLab) in Hall A using recoil polarimetry. With a total uncertainty of approximately 1%, the new data clearly show that the deviation of the ratio μ p G E / G M from unity observed in previous polarization measurements at high Q 2 continues down to the lowest Q 2 value of this measurement. The updated global fit that includes the new results yields an electric (magnetic) form factor roughly 2% smaller (1% larger) than the previous global fit in this Q 2 range. We obtain new extractions of the proton electric and magnetic radii, which are 〈 r E 2 〉 1 / 2 = 0.875 ± 0.010 fm and 〈 r M 2 〉 1 / 2 = 0.867 ± 0.020 fm . The charge radius is consistent with other recent extractions based on the electron–proton interaction, including the atomic hydrogen Lamb shift measurements, which suggests a missing correction in the comparison of measurements of the proton charge radius using electron probes and the recent extraction from the muonic hydrogen Lamb shift.


Physical Review Letters | 2015

Observation of H Λ 4 Hyperhydrogen by Decay-Pion Spectroscopy in Electron Scattering

A. Esser; S. Nagao; F. Schulz; P. Achenbach; C. Ayerbe Gayoso; R. Böhm; O. Borodina; D. Bosnar; V. Bozkurt; L. Debenjak; M. O. Distler; I. Friščić; Y. Fujii; T. Gogami; O. Hashimoto; S. Hirose; H. Kanda; M. Kaneta; E. Kim; Y. Kohl; Junichiro Kusaka; A. Margaryan; H. Merkel; M. Mihovilovič; U. Müller; S. N. Nakamura; J. Pochodzalla; C. Rappold; J. Reinhold; T. Saito

At the Mainz Microtron MAMI, the first high-resolution pion spectroscopy from decays of strange systems was performed by electron scattering off a (9)Be target in order to study the Λ binding energy of light hypernuclei. Positively charged kaons were detected by a short-orbit spectrometer with a broad momentum acceptance at 0° forward angles with respect to the beam, efficiently tagging the production of strangeness in the target nucleus. Coincidentally, negatively charged decay pions were detected by two independent high-resolution spectrometers. About 10(3) pionic weak decays of hyperfragments and hyperons were observed. The pion momentum distribution shows a monochromatic peak at pπ≈133  MeV/c, corresponding to the unique signature for the two-body decay of hyperhydrogen Λ(4)H→(4)He+π(-), stopped inside the target. Its Λ binding energy was determined to be BΛ=2.12±0.01  (stat)±0.09  (syst)MeV with respect to the (3)H+Λ mass.


Physical Review C | 2006

Proton G_E/G_M from beam-target asymmetry

M. K. Jones; A. Aghalaryan; Abdellah Ahmidouch; R. Asaturyan; F. Bloch; Werner U. Boeglin; P. Bosted; C. Carasco; R. Carlini; J. Cha; J. P. Chen; M. E. Christy; L. Cole; Luminita Coman; D. Crabb; S. Danagoulian; D. Day; James Dunne; M. Elaasar; R. Ent; H. Fenker; E. Frlez; D. Gaskell; L. Gan; J. Gomez; Bitao Hu; J. Jourdan; Christopher Douglas Keith; Cynthia Keppel; Mahbubul Khandaker

The ratio of the protons electric to magnetic form factor, G{sub E}/G{sub M}, can be extracted in elastic electron-proton scattering by measuring cross sections, beam-target asymmetry, or recoil polarization. Separate determinations of G{sub E}/G{sub M} by cross sections and recoil polarization observables disagree for Q{sup 2}>1 (GeV/c){sup 2}. Measurement by a third technique might uncover an unknown systematic error in either of the previous measurements. The beam-target asymmetry has been measured for elastic electron-proton scattering at Q{sup 2} = 1.51 (GeV/c){sup 2} for target spin orientation aligned perpendicular to the beam momentum direction. This is the largest Q{sup 2} at which G{sub E}/G{sub M} has been determined by a beam-target asymmetry experiment. The result, {mu}G{sub E}/G{sub M}=0.884{+-}0.027{+-}0.029, is compared to previous world data.


Physics Letters B | 2008

Transverse momentum dependence of semi-inclusive pion production

H. Mkrtchyan; P. Bosted; G. S. Adams; A. Ahmidouch; T. Angelescu; J. Arrington; R. Asaturyan; Oliver Keith Baker; N. Benmouna; C. Bertoncini; H.P. Blok; W. Boeglin; H. Breuer; M. E. Christy; Simon Henry Connell; Y. Cui; M. M. Dalton; S. Danagoulian; D. Day; T. Dodario; J. A. Dunne; D. Dutta; N. El Khayari; R. Ent; H. Fenker; V. V. Frolov; L. Gan; D. Gaskell; K. Hafidi; W. Hinton

Abstract Cross sections for semi-inclusive electroproduction of charged pions ( π ± ) from both proton and deuteron targets were measured for 0.2 x 0.5 , 2 Q 2 4 GeV 2 , 0.3 z 1 , and P t 2 0.2 GeV 2 . For P t 0.1 GeV , we find the azimuthal dependence to be small, as expected theoretically. For both π + and π − , the P t dependence from the deuteron is found to be slightly weaker than from the proton. In the context of a simple model, this implies that the initial transverse momenta width of d quarks is larger than for u quarks and, contrary to expectations, the transverse momentum width of the favored fragmentation function is larger than the unfavored one.


Physical Review C | 2012

Semi-Inclusive Charged-Pion Electroproduction off Protons and Deuterons: Cross Sections, Ratios and Access to the Quark-Parton Model at Low Energies

R. Asaturyan; R. Ent; H. Mkrtchyan; T. Navasardyan; V. Tadevosyan; G. S. Adams; A. Ahmidouch; T. Angelescu; J. Arrington; A. Asaturyan; Oliver Keith Baker; N. Benmouna; C. Bertoncini; H.P. Blok; W. Boeglin; P. Bosted; H. Breuer; M. E. Christy; Simon Henry Connell; Y. Cui; M. M. Dalton; S. Danagoulian; D. Day; J. Dunne; D. Dutta; N. El Khayari; H. Fenker; V. V. Frolov; L. Gan; D. Gaskell

A large set of cross sections for semi-inclusive electroproduction of charged pions (π^±) from both proton and deuteron targets was measured. The data are in the deep-inelastic scattering region with invariant mass squared W^2>4 GeV^2 (up to ≈7 GeV^2) and range in four-momentum transfer squared 2<Q^2<4 (GeV/c)^2, and cover a range in the Bjorken scaling variable 0.2<x<0.6. The fractional energy of the pions spans a range 0.3<z<1, with small transverse momenta with respect to the virtual-photon direction, Pt^(2)_(t)<0.2 (GeV/c)2. The invariant mass that goes undetected, M_x or W′, is in the nucleon resonance region, W′<2 GeV. The new data conclusively show the onset of quark-hadron duality in this process, and the relation of this phenomenon to the high-energy factorization ansatz of electron-quark scattering and subsequent quark→pion production mechanisms. The x, z, and Pt^(2)_(t) dependences of several ratios (the ratios of favored-unfavored fragmentation functions, charged pion ratios, deuteron-hydrogen and aluminum-deuteron ratios for π^+ and π^−) have been studied. The ratios are found to be in good agreement with expectations based upon a high-energy quark-parton model description. We find the azimuthal dependences to be small, as compared to exclusive pion electroproduction, and consistent with theoretical expectations based on tree-level factorization in terms of transverse-momentum-dependent parton distribution and fragmentation functions. In the context of a simple model, the initial transverse momenta of d quarks are found to be slightly smaller than for u quarks, while the transverse momentum width of the favored fragmentation function is about the same as for the unfavored one, and both fragmentation widths are larger than the quark widths.


Physical Review Letters | 2011

Probing the high momentum component of the deuteron at high Q2.

W. Boeglin; L. Coman; P. Ambrozewicz; K. A. Aniol; J. Arrington; G. Batigne; P. Bosted; A. Camsonne; G. Chang; J. P. Chen; Suyong Choi; A. Deur; M. B. Epstein; John M. Finn; S. Frullani; C. Furget; F. Garibaldi; O. Gayou; R. Gilman; O. Hansen; D. Hayes; D. W. Higinbotham; W. Hinton; C. E. Hyde; H. Ibrahim; C. W. de Jager; X. Jiang; M. K. Jones; L. J. Kaufman; A. Klein

W.U. Boeglin, L. Coman, P. Ambrozewicz, K. Aniol, J. Arrington, G. Batigne, P. Bosted, A. Camsonne, G. Chang, J.P. Chen, S. Choi, A. Deur, M. Epstein, J.M. Finn, ∗ S. Frullani, C. Furget, F. Garibaldi, O. Gayou, 5 R. Gilman, 5 O. Hansen, D. Hayes, D.W. Higinbotham, W. Hinton, C. Hyde, H. Ibrahim, 11 C.W. de Jager, X. Jiang, M. K. Jones, L.J. Kaufman, † A. Klein, S. Kox, L. Kramer, G. Kumbartzki, J.M. Laget, J. LeRose, R. Lindgren, D.J. Margaziotis, P. Markowitz, K. McCormick, Z. Meziani, R. Michaels, B. Milbrath, J. Mitchell, ‡ P. Monaghan, M. Moteabbed, P. Moussiegt, R. Nasseripour, K. Paschke, C. Perdrisat, E. Piasetzky, V. Punjabi, I.A. Qattan, 3 G. Quéméner, R.D. Ransome, B. Raue, J.S. Réal, J. Reinhold, B. Reitz, R. Roché, M. Roedelbronn, A. Saha, ∗ K. Slifer, P. Solvignon, V. Sulkosky, § P.E. Ulmer, ‡ E. Voutier, L.B. Weinstein, B. Wojtsekhowski, and M. Zeier

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R. Ent

Thomas Jefferson National Accelerator Facility

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J. Arrington

Argonne National Laboratory

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R. Carlini

Thomas Jefferson National Accelerator Facility

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R. Asaturyan

Yerevan Physics Institute

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