Eur. Phys. J. A (2007) 31: 383-391
https://doi.org/10.1140/epja/i2006-10228-0

Regular Article - Hadron Physics

Precision measurement of vector and tensor analyzing powers in elastic deuteron-proton scattering

¹ Kernfysisch Versneller Instituut (KVI), University of Groningen, Zernikelaan 25, 9747 AA, Groningen, The Netherlands
² Centro de Fisica Nuclear da Universidade de Lisboa, P-1649-003, Lisboa, Portugal
³ Department of Physics, Saitama University, 338-8570, Saitama, Japan
⁴ Center for Nuclear Study, University of Tokyo, Tokyo, Japan
⁵ Department of Physics, University of Tokyo, Tokyo, Japan
⁶ Nishina Center, RIKEN, Tokyo, Japan
⁷ M. Smoluchowski Institute of Physics, Jagiellonian University, Kraków, Poland

^* e-mail: mardanpur@kvi.nl

Received: 8 November 2006
Accepted: 7 February 2007
Published online: 1 March 2007

Abstract

High-precision vector and tensor analyzing powers of elastic deuteron-proton ( d + p) scattering have been measured at intermediate energies to investigate effects of three-nucleon forces. Angular distributions in the range of 70^°-120^° in the center-of mass frame for incident-deuteron energies E _d ^lab = 130 and 180 MeV were obtained using the RIKEN facility. The beam polarization was unambiguously determined by measuring the ^12C (d, α)^10B(2⁺) reaction at 0^°. Results of the measurements are compared with state-of-the-art three-nucleon calculations. The present modeling of nucleon-nucleon forces and its extension to the three-nucleon system is not sufficient to describe the high-precision data consistently and requires, therefore, further investigation.