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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2011, Volume 93, Issue 5, Pages 283–288
(Mi jetpl1844)
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This article is cited in 4 scientific papers (total in 4 papers)
FIELDS, PARTICLES, AND NUCLEI
Emission of light nuclei $(p, d, t, \alpha)$ in the process of annihilation of slow antiprotons in nuclear emulsion
V. V. Dubinina, N. P. Egorenkova, E. A. Pozharova, V. A. Smirnitsky Institute for Theoretical and Experimental Physics (Russian Federation State Scientific Center), Moscow
Abstract:
The annihilation of slow ($\sim7$ MeV) antiprotons in nuclear emulsion has been studied. The yields and energy spectra of $p$, $d$, $t$ and $\alpha$ particles in the evaporation region have been measured. The shape of the spectra of $p$, $d$ and $t$ is in agreement with the Maxwell distribution and the excitation energy of a nucleus is consistent with a theoretical estimate for evaporation from the equilibrium state. The probability of the absorption of antiprotons inside the nucleus estimated from the multiplicity of $h$ particles is $\varepsilon=(2.0\pm0.6)\cdot10^{-2}$. The relative $d/p$ yield coincides with a similar ratio appearing in the capture of slow $\pi^-$ mesons by nuclei in the nuclear emulsion. The yields of $t$- и $\alpha$ particles in the process of the annihilation of antiprotons are much higher than those in a similar process for pions. To identify $g$ particles $(0.29<\beta<0.70)$, energy losses $dE/dx$ on ionization and multiple scattering have been measured. In this velocity region, the yields of $p$, $d$, $t$, and pions have been observed. The ratios $(n_d/n_p)_g$, $(n_d/n_p)_b$ and $(n_d/n_p)$ measured in the capture of $\pi^-$ mesons are almost the same. In this velocity range ($g$ particles), $\alpha$ particles have not been observed.
Received: 29.12.2010 Revised: 27.01.2011
Citation:
V. V. Dubinina, N. P. Egorenkova, E. A. Pozharova, V. A. Smirnitsky, “Emission of light nuclei $(p, d, t, \alpha)$ in the process of annihilation of slow antiprotons in nuclear emulsion”, Pis'ma v Zh. Èksper. Teoret. Fiz., 93:5 (2011), 283–288; JETP Letters, 93:5 (2011), 253–258
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https://www.mathnet.ru/eng/jetpl1844 https://www.mathnet.ru/eng/jetpl/v93/i5/p283
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Abstract page: | 233 | Full-text PDF : | 45 | References: | 46 |
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