Cynthia E. Keppel

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Considerable evidence now exists to show that that the relative biological effectiveness (RBE) changes considerably along the proton depth-dose distribution, with progressively higher RBE values at the distal part of the modulated, or spread out Bragg peak (SOBP) and in the distal dose fall-off (DDF). However, the highly variable nature of the existing(More)
The neutron longitudinal and transverse asymmetries A n 1 and A n 2 have been extracted from deep inelas-tic scattering of polarized electrons by a polarized 3 He target at incident energies of 19.42, 22.66 and 25.51 GeV. The measurement allows for the determination of the neutron spin structure functions g n 1 (x; Q 2) and g n 2 (x; Q 2) over the range(More)
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%.(More)
We present experimental results of the first high-precision test of quark-hadron duality in the spin-structure function g_{1} of the neutron and 3He using a polarized 3He target in the four-momentum-transfer-squared range from 0.7 to 4.0 (GeV/c);{2}. Global duality is observed for the spin-structure function g_{1} down to at least Q;{2}=1.8 (GeV/c);{2} in(More)
We have examined the spin structure of the proton in the region of the nucleon resonances (1.085 GeV<W<1.910 GeV) at an average four momentum transfer of Q2=1.3 GeV2. Using the Jefferson Lab polarized electron beam, a spectrometer, and a polarized solid target, we measured the asymmetries A|| and A(perpendicular) to high precision, and extracted the(More)
R. Asaturyan,1 R. Ent,2,3 H. Mkrtchyan,1 T. Navasardyan,1 V. Tadevosyan,1 G. S. Adams,4 A. Ahmidouch,5 T. Angelescu,6 J. Arrington,7 A. Asaturyan,1 O. K. Baker,2,3 N. Benmouna,8 C. Bertoncini,9 H. P. Blok,10 W. U. Boeglin,11 P. E. Bosted,2,12 H. Breuer,13 M. E. Christy,3 S. H. Connell,14 Y. Cui,15 M. M. Dalton,16 S. Danagoulian,5 D. Day,17 J. A. Dunne,18 D.(More)
C. Bochna,1 B. P. Terburg,1 D. J. Abbott,2 A. Ahmidouch,3 C. S. Armstrong,4 J. Arrington,5 K. A. Assamagan,6 O. K. Baker,2,6 S. P. Barrow,7 D. P. Beatty,7 D. H. Beck,1 S. Y. Beedoe,8 E. J. Beise,9 J. E. Belz,10 P. E. Bosted,11 E. J. Brash,12,18 H. Breuer,9 R. V. Cadman,1 L. Cardman,2 R. D. Carlini,2 J. Cha,6 N. S. Chant,9 G. Collins,9 C. Cothran,13 W. J.(More)
  • J. Arrington, P. Anthony, +43 authors B. Zeidman
  • 1996
J. Arrington, P. Anthony, R. G. Arnold, E. J. Beise, J. E. Belz, P. E. Bosted, H.-J. Bulten, M. S. Chapman, K. P. Coulter, F. Dietrich, R. Ent, M. Epstein, B. W. Filippone, H. Gao, R. A. Gearhart, D. F. Geesaman, J.-O. Hansen, R. J. Holt, H. E. Jackson, C. E. Jones, C. E. Keppel, E. R. Kinney, S. Kuhn, K. Lee, W. Lorenzon, A. Lung, N. C. R. Makins, D. J.(More)
We have measured the nuclear transparency of the A(e,e'pi+) process in 2H, 12C, 27Al, 63Cu, and 197Au targets. These measurements were performed at the Jefferson Laboratory over a four momentum transfer squared range Q2=1.1 to 4.7 (GeV/c)2. The nuclear transparency was extracted as the super-ratio of (sigmaA/sigmaH) from data to a model of(More)