## Quasi-free limit in the deuteron-deuteron three-body break-up process

R. Ramazani-Sharifabadi, H. R. Amir-Ahmadi, M. T. Bayat, I. Ciepał, M. Eslami-Kalantari, N. Kalantar-Nayestanaki, St. Kistryn, A. Kozela, M. Mahjour-Shafiei, H. Mardanpour, J. G. Messchendorp, M. Mohammadi-Dadkan, A. Ramazani-Moghaddam-Arani, E. Stephan, and H. Tavakoli-Zaniani

SciPost Phys. Proc. 3, 057 (2020) · published 1 April 2020

- doi: 10.21468/SciPostPhysProc.3.057
- Submissions/Reports

### Proceedings event

24th European Few Body Conference

### Abstract

Detailed measurements of vector and tensor analyzing powers of the 2H(d, dp)n breakup process are presented. The data were obtained using a polarized deuteron-beam with an energy of 65 MeV/nucleon impinging on a liquid-deuterium target. The experiment was conducted at the AGOR facility at KVI using the BINA 4Pi-detection system. The focus of this contribution is to analyze data of the dd scattering process in the regime at which the neutron acts as a spectator, which we refer to as the quasi-free (QF) limit. To achieve this, events for which the final-state deuteron and proton are coplanar have been analyzed and the data have been sorted for various reconstructed momenta of the missing neutron. In the limit of vanishing neutron momentum and at small deuteron-proton momentum transfer, the data match very well with measured and predicted spin observables of the elastic deuteron-proton scattering process. The agreement deteriorates rapidly with increasing neutron momentum and deuteron-proton momentum transfer. The results of coplanar configurations in four-body phase space are compared with the results of recent available theoretical calculations based on the Single-Scattering Approximation.

### Authors / Affiliations: mappings to Contributors and Organizations

See all Organizations.-
^{1 }^{2 }reza ramazani sharifabadi, -
^{1 }Hamid Reza Amir-Ahmadi, -
^{1 }M. T. Bayat, -
^{3 }Izabela Ciepał, -
^{4 }Mohammad Eslami-Kalantari, -
^{1 }Nasser Kalantar Nayestanaki, -
^{5 }Stanisław Kistryn, -
^{3 }Adam Kozela, -
^{2 }Masoud Mahjour-Shafiei, -
^{1 }Hossein Mardanpour, -
^{1 }Johan Messchendorp, -
^{1 }^{6 }Maisam Mohammadi-Dadkan, -
^{7 }Ahmad Ramazani-Moghaddam-Aran, -
^{8 }Elżbieta Stephan, -
^{1 }^{4 }H. Tavakoli-Zaniani

^{1}Rijksuniversiteit Groningen / University of Groningen [RG]^{2}دانشگاه تهران / University of Tehran [UT]^{3}Institute of Nuclear Physics Polish Academy of Sciences [IFJ PAN]^{4}دانشگاه یزد / Yazd University^{5}Uniwersytet Jagielloński / Jagiellonian University^{6}دانشگاه سیستان و بلوچستان / University of Sistan and Baluchestan^{7}University of Kashan^{8}Uniwersytet Śląski w Katowicach / University of Silesia [UŚ]