https://doi.org/10.1140/epjp/s13360-024-05623-z
Regular Article
Contributions of various mechanisms of pion production into kinematical spectra of negative pions in collisions of deuterons with 12C nuclei at incident momentum of 4.2 GeV/c per nucleon
1
Physical-Technical Institute of Uzbekistan Academy of Sciences, Chingiz Aytmatov Str. 2b, 100084, Tashkent, Uzbekistan
2
New Uzbekistan University, Tashkent, Uzbekistan
3
National University of Science and Technology MISIS (NUST MISIS), Almalyk Branch, Almalyk, Uzbekistan
4
Gulistan State University, Gulistan, Uzbekistan
Received:
11
May
2024
Accepted:
5
September
2024
Published online:
20
September
2024
The new experimental results on various kinematical characteristics of the negative pions, coming from decays of Δ0 and Δ− resonances, and produced due to direct production mechanism in pairs (π+π−) and inelastic charge exchange reaction (n → p + π−) of the neutrons of projectile and target nuclei, in d12C collisions at 4.2 GeV/c per nucleon have been presented. The fractions of the negative pions coming from each of the above mechanisms in d12C collisions at 4.2 GeV/c per nucleon have been estimated. The contributions to the negative pion production from inelastic charge exchange reaction of a target neutron, from inelastic charge exchange reaction of a projectile neutron, and from direct production mechanism in pairs (π+π−), have coincided within statistical uncertainties, being equal ≈ 13% for each of these three sources of π− production. The widths (Ϭ) and average values of all analyzed kinematical spectra (full momentum, transverse momentum, longitudinal rapidity, and emission angle distributions) of the negative pions, coming from decays of Δ0 and Δ− resonances, have proved to be significantly smaller as compared to those of π− mesons, coming from direct production mechanism and inelastic charge exchange reaction of the target and projectile neutrons in d12C collisions at 4.2 GeV/c per nucleon.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
