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23 April 2024

» arxiv » 0908.1099

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Spin-isospin selectivity in three-nucleon forces
H. Mardanpour ; H.R. Amir-Ahmadi ; R. Benard ; A. Biegun ; M. Eslami-Kalantari ; L. Joulaeizadeh ; N. Kalantar-Nayestanaki ; M. Kiš ; St. Kistryn ; A. Kozela ; H. Kuboki ; Y. Maeda ; M. Mahjour-Shafiei ; J.G. Messchendorp ; K. Miki ; S. Noji ; A. Ramazani-Moghaddam-Arani ; H. Sakai ; M. Sasano ; K. Sekiguchi ; E. Stephan ; R. Sworst ; Y. Takahashi ; K. Yako ;
Date:	7 Aug 2009
Abstract:	Precision data are presented for the break-up reaction, $^2{ m H}(vec p,pp)n$, within the framework of nuclear-force studies. The experiment was carried out at KVI using a polarized-proton beam of 190 MeV impinging on a liquid-deuterium target and by exploiting the detector, BINA. Some of the vector-analyzing powers are presented and compared with state-of-the-art Faddeev calculations including three-nucleon forces effect. Significant discrepancies between the data and theoretical predictions were observed for kinematical configurations which correspond to the $^2{ m H}(vec p,^2$He$)n$ channel. These results are compared to the $^2{ m H}(vec p,d)p$ reaction to test the isospin sensitivity of the present three-nucleon force models. The current modeling of two and three-nucleon forces is not sufficient to describe consistently polarization data for both isospin states.
Source:	arXiv, 0908.1099
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