학술논문
Observation of new states of the He isotope.
Document Type
Article
Author
Source
Subject
*HELIUM isotopes
*EXCITATION energy (In situ microanalysis)
*EXISTENCE theorems
*ABSORPTION
*CHEMICAL reactions
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Language
ISSN
0021-3640
Abstract
The formation of the He heavy isotope has been studied in the B(π, pt)He, B(π, dd)He, and B(π, pd)He reactions of absorption of stopped π mesons. No indications of the existence of a low-lying level with E ∼ 1 MeV have been obtained in any of the three reactions. The existence of three narrow states with excitation energies E = 3.1(1), 4.90(15), and 6.65(15) MeV has been proven. Highly excited states with E = 16.9(5) MeV, Γ = 1.0(3) MeV, E = 19.8(3) MeV, Γ = 1.5(3) MeV, and E = 24.8(4) MeV, Γ = 4.6(7) MeV have been identified. [ABSTRACT FROM AUTHOR]