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Searching for 9He upon the Absorption of Stopped Pions by 14C Nuclei

Abstract

An experimental search is conducted for the formation of the heavy 9He isotope of helium upon the absorption of stopped pions by 14C nuclei. The structure of 9He levels in the missing mass spectra in reactions 14C(π, p4He)Х and 14C(π, d3He)Х is studied. A state with a high energy of excitation of 12.5 MeV and a state width of 1.5 MeV is detected for the first time. Suppression of the formation of ground state 9He in the considered reactions is established.

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Funding

This work was supported by the Ministry of Education and Science of the Russian Federation, grant no. 4911.2017/6.7; and by the MEPhI Competitive Ability Improvement Program under an agreement with the Ministry of Education and Science of the Russian Federation dated August 27, 2013, project no. 02.a03.21.0005.

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Correspondence to T. I. Leonova.

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Translated by V. Alekseev

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Gurov, Y.B., Lapushkin, S.V., Leonova, T.I. et al. Searching for 9He upon the Absorption of Stopped Pions by 14C Nuclei. Bull. Russ. Acad. Sci. Phys. 84, 879–883 (2020). https://doi.org/10.3103/S1062873820080146

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