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Production spectra with a Sigma(-) hyperon in ( pi(-), K (+)) reactions on light to heavy nuclei

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Title: Production spectra with a Sigma(-) hyperon in ( pi(-), K (+)) reactions on light to heavy nuclei
Authors: Harada, Toru1 Browse this author →KAKEN DB
Hirabayashi, Yoshiharu Browse this author →KAKEN DB
Authors(alt): Harada, Tohru1
Issue Date: 19-May-2023
Publisher: American Physical Society (APS)
Journal Title: Physical Review C
Volume: 107
Issue: 5
Start Page: 054611-1
End Page: 054611-20
Publisher DOI: 10.1103/PhysRevC.107.054611
Abstract: We study theoretically production spectra with a Sigma (-) hyperon via ( pi(-), K (+)) reactions on C-12, Si-28, Ni-58, In-115, and Bi-209 targets, using the Green's function method in the framework of a distorted-wave impulse approximation with the optimal Fermi averaging for an elementary pi- p -> K + Sigma(-) t matrix. Adopting distorted waves obtained by solving a Klein-Gordon equation for pi(-) and K+ mesons, we improve and update the calculated spectra of Sigma(-) production cross sections comprehensively in comparison with the data of the KEK-E438 experiment. We use several Sigma(-)nucleus (optical) potentials that are determined by fits to the Sigma(-) atomic data and that take into account the energy dependence arising from the nuclear excitation via Sigma N -> Sigma N scatterings with a Sigma hyperon effective mass. The results show that the absolute values and the shapes of these calculated spectra are in excellent agreement with those of the data, so that a mass-number dependence of integrated cross sections on the light-to-heavy targets is well reproduced in our calculations. It confirms that the Sigma-nucleus potentials having a repulsion inside the nuclear surface and an attraction outside the nucleus with a sizable absorption are favored in reproducing the data of the nuclear ( pi(-), K (+)) spectra and the Sigma- atomic x ray simultaneously, whereas it is still difficult to determine the radial distribution of the Sigma(-)nucleus potential inside the nucleus and its strength at the center.
Rights: ©2023 American Physical Society
Type: article
Appears in Collections:情報基盤センター (Information Initiative Center) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 平林 義治

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