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Title
Japanese:Structure of double pionic atoms 
English:Structure of double pionic atoms 
Author
Japanese: 谷 明里, 池野 なつ美, 慈道 大介, 永廣 秀子, 藤岡 宏之, 板橋 健太, 比連崎 悟.  
English: Akari Tani, Natsumi Ikeno, Daisuke Jido, Hideko Nagahiro, Hiroyuki Fujioka, Kenta Itahashi, Satoru Hirenzaki.  
Language English 
Journal/Book name
Japanese:Progress of Theoretical and Experimental Physics 
English:Progress of Theoretical and Experimental Physics 
Volume, Number, Page Vol. 2021    No. 3    p. 033D02
Published date Mar. 2021 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL http://dx.doi.org/10.1093/ptep/ptab023
 
DOI https://doi.org/10.1093/ptep/ptab023
Abstract <jats:title>Abstract</jats:title> <jats:p>We study theoretically the structure of double pionic atoms, in which two negatively charged pions ($\pi^-$) are bound in the atomic orbits. The double pionic atom is considered to be an interesting system from the point of view of the multi-bosonic systems. In addition, it could be possible to deduce valuable information on the isospin $I = 2$$\pi\pi$ interaction and the pion–nucleus strong interaction. In this paper, we take into account the $\pi\pi$ strong and electromagnetic interactions, and evaluate the effects on the binding energies by perturbation theory for the double pionic atoms in heavy nuclei. We investigate several combinations of two pionic states and find that the order of magnitude of the energy shifts due to the $\pi\pi$ interaction is around 10 keV for the strong interaction and around 100 keV for the electromagnetic interaction for the ground states.</jats:p>

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