Abstract
The 28Si(p, p′γ0 X)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 γ-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 α cluster, the knockout of four nucleons with a total charge number of 2, the formation of the ΔSi isobaric nucleus, the formation of the Δ isobar in the interaction of the incident proton with a nuclear nucleon, and the production of a π 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.
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Original Russian Text © A.A. Vasenko, N.D. Galanina, K.E. Gusev, V.S. Demidov, E.V. Demidova, I.V. Kirpichnikov, A.Yu. Sokolov, A.S. Starostin, N.A. Khaldeeva, 2006, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2006, Vol. 83, No. 10, pp. 504–509.
An erratum to this article is available at http://dx.doi.org/10.1134/S0021364006120149.
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Vasenko, A.A., Galanina, N.D., Gusev, K.E. et al. Formation of 24Mg* in the spallation of 28Si nuclei by 1-GeV protons. Jetp Lett. 83, 433–438 (2006). https://doi.org/10.1134/S002136400610002X
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DOI: https://doi.org/10.1134/S002136400610002X