Investigation of the Three-Nucleon System Dynamics in the Deuteron–Proton Breakup Reaction

I Ciepał,E Stephan,B Kłos,A Deltuva,R Skibiński,R Sworst,Da Kirillov,A Kozela,A C Fonseca,G Khatri,A Ramazani-Moghaddam-Arani,A Magiera,R Siudak,H Kamada,V Jha,K Bodek,H Machner,B J Roy,K Sekiguchi,H Witała,A Biegun,N Kalantar‐Nayestanaki ,Mohammad H Eslami ,J G Messchendorp ,I.m Sitnik ,S Kistryn ,S Kliczewski ,J Urbán ,M Kravčíková ,Д А Кириллов ,G Martinská ,J Golak,J Zejma,H Sakai,W Parol,A Nogga,E Epelbaum

doi:10.1007/s00601-014-0841-3

Abstract

Precise and large sets of cross section, vector A x , A y and tensor A xx , A xy , A yy analyzing power data for the 1 H(d, pp)n breakup reactions were measured at 100 and 130 MeV deuteron beam energies with the SALAD and BINA detectors at KVI and the Germanium Wall setup at FZ-Julich. Results are compared with various theoretical approaches which model the three-nucleon system dynamics. The cross section data reveal a sizable three-nucleon force (3NF) and Coulomb force influence. In case of the analyzing powers very low sensitivity to these effects was found and the data are well describe by 2N models only. For A xy at 130 MeV, serious disagreements were observed when 3NF models are included in the calculations.

Highlights

One of the key issues of modern nuclear physics is the investigation of the forces acting between nucleons
The simplest is the 3N system, which can be used to test dynamics and features of the 3N Hamiltonian. Such systems can be studied in details with the use of the deuteron breakup reaction, offering a very unique laboratory in which even very subtle dynamical effects like the 3NF, Coulomb force or relativistic components can be studied
The theoretical predictions of observables are nowadays obtained via exact solutions of the 3N Faddeev equations for the given interaction model, like for example realistic NN potentials supplemented with 3NF models (TM99 3NF [1] or Urbana IX 3NF [2]), or the 3N system dynamics is treated within the coupledchannels (CC) approach [3] with a single Δ-isobar degree of freedom (d.o.f.), which generates certain 3NF effects

Summary

Introduction

One of the key issues of modern nuclear physics is the investigation of the forces acting between nucleons. The interaction models are created based on the meson exchange theory or phenomenology These so-called realistic NN potentials, like CD Bonn, Nijmegen or Argonne AV18 are able to predict observables for 2N systems with very high precision. The theoretical predictions of observables are nowadays obtained via exact solutions of the 3N Faddeev equations for the given interaction model, like for example realistic NN potentials supplemented with 3NF models (TM99 3NF [1] or Urbana IX 3NF [2]), or the 3N system dynamics is treated within the coupledchannels (CC) approach [3] with a single Δ-isobar degree of freedom (d.o.f.), which generates certain 3NF effects.

Experimental Setups

Results

Summary and Outlook