1. Formation of 24Mg* in the Splitting of 28Si Nuclei by 1-GeV Protons
- Author
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Vasenko, A. A., Galanina, N. D., Gusev, K. E., Demidov, V. S., Demidova, E. V., Kirpichnikov, I. V., Sokolov, A. Yu., Starostin, A. S., and Khaldeeva, N. A.
- Subjects
Nuclear Experiment - Abstract
The 28Si(p, p' gamma)24Mg reaction has been studied at the ITEP accelerator by the hadron-gamma coincidence method for a proton energy of 1 GeV. Two reaction products are detected: a 1368.6-keV gamma-ray photon accompanying the transition of the 24Mg* nucleus from the first excited state to the ground state and a proton p' whose momentum is measured in a magnetic spectrometer. The measured distribution in the energy lost by the proton in interaction is attributed to five processes: the direct knockout of a nuclear alpha cluster, the knockout of four nucleons with a total charge number of 2, the formation of the DeltaSi isobaric nucleus, the formation of the Delta isobar in the interaction of the incident proton with a nuclear nucleon, and the production of a pi meson, which is at rest in the nuclear reference frame. The last process likely corresponds to the reaction of the formation of a deeply bound pion state in the 28P nucleus. Such states were previously observed only on heavy nuclei. The cross sections for the listed processes have been estimated., Comment: 14 pages, 3 figures submitted to JETP Letters
- Published
- 2006
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