Observation of Isovector-Isoscalar Two-Body Currents in Deuteron Knockout from <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span>He

C. Tripp; G. S. Adams; D. Beck; K. Dow; J. M. Finn; V. Frolov; O. Hansen; T. Kobayashi; J. McIntyre; R. Lourie; M. Nozar; S. Nagorny; J. Shaw; P. Stoler; T. Tamae; D. Tieger; W. Turchinetz; G. Warren; T. P. Welch; E. J. Winhold; M. Witkowski; B. Wojtsekhowski

doi:10.1103/PhysRevLett.76.885

Observation of Isovector-Isoscalar Two-Body Currents in Deuteron Knockout from $^{3}$ He

C. Tripp, G. S. Adams, D. Beck, K. Dow, J. M. Finn, V. Frolov, O. Hansen, T. Kobayashi, J. McIntyre, R. Lourie, M. Nozar, S. Nagorny, J. Shaw, P. Stoler, T. Tamae, D. Tieger, W. Turchinetz, G. Warren, T. P. Welch, E. J. Winhold, M. Witkowski, and B. Wojtsekhowski

Phys. Rev. Lett. 76, 885 – Published 5 February 1996

Abstract

The reaction $^{3} He ({e, e}^{'} d) p$ was measured at four-momentum transfer $q = 420$ MeV, for proton recoil momentum $P_{r} = 22$ , 54, and 62 MeV/c, in parallel deuteron kinematics. Longitudinal $(L)$ and transverse $(T)$ response functions were obtained by means of Rosenbluth separations. The separated response functions are, respectively, found to be dominated by the contributions of isoscalar and isovector two-body currents. The $L / T$ ratios are about 3.5. This is an order of magnitude lower than that for elastic scattering on a free deuteron, or what would be expected for a purely isoscalar transition, but approximately agrees with what is theoretically expected for isoscalar plus isovector contributions.

Received 11 September 1995

DOI:https://doi.org/10.1103/PhysRevLett.76.885

Authors & Affiliations

C. Tripp¹, G. S. Adams¹, D. Beck², K. Dow³, J. M. Finn⁴, V. Frolov¹, O. Hansen³, T. Kobayashi¹, J. McIntyre⁴, R. Lourie⁵, M. Nozar¹, S. Nagorny⁶, J. Shaw¹, P. Stoler¹, T. Tamae⁷, D. Tieger³, W. Turchinetz³, G. Warren³, T. P. Welch³, E. J. Winhold¹, M. Witkowski¹, and B. Wojtsekhowski^1,8

¹Physics Department, Rensselaer Polytechnic Institute, Troy, New York 12180
²Physics Department, University of Illinois, Champaign, Illinois 61801
³MIT-Bates Linear Accelerator Center, Middleton, Massachusetts 01949
⁴Physics Department, College of William and Mary, Williamsburg, Virginia 23187-8795
⁵Institute of Nuclear and Particle Physics and Department of Physics, University of Virginia, Charlottesville, Virginia 22901
⁶Kharkov Institute of Physics and Technology, 310108 Kharkov, Ukraine
⁷Laboratory of Nuclear Science, Faculty of Science, Tohoku University, Mikamine, Taihaku-ku, Sendai, Japan
⁸Budker Nuclear Physics Institute, RU-630090 Novosibirsk, Russia