Charged Particle Production in Stopped Pion Absorption by Nuclei


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Abstract

The spectra of 3,4He charged particles produced in stopped pion absorption by nuclei were measured for 17 nuclei in the mass-number range of 6 ≤ A ≤ 209 by means of a semiconductor spectrometer. These data were analyzed on the basis of a phenomenological model where the absorption reaction in question is treated as a three-stage process: primary absorption by intranuclear clusters, preequilibrium stage, and evaporation stage. It is shown that a dominant contribution to the production of helium isotopes with energies not less than 20 MeV comes from the preequilibrium stage. The contribution of the knockout and pickup mechanisms to 3,4He production is estimated.

About the authors

Yu. B. Gurov

National Research Nuclear University MEPhI

Email: chernyshev@mephi.ru
Russian Federation, Moscow, 115409

V. S. Karpukhin

National Research Nuclear University MEPhI

Email: chernyshev@mephi.ru
Russian Federation, Moscow, 115409

S. V. Lapushkin

National Research Nuclear University MEPhI

Email: chernyshev@mephi.ru
Russian Federation, Moscow, 115409

T. I. Leonova

National Research Nuclear University MEPhI

Email: chernyshev@mephi.ru
Russian Federation, Moscow, 115409

R. V. Pritula

National Research Nuclear University MEPhI

Email: chernyshev@mephi.ru
Russian Federation, Moscow, 115409

B. A. Chernyshev

National Research Nuclear University MEPhI

Author for correspondence.
Email: chernyshev@mephi.ru
Russian Federation, Moscow, 115409

V. G. Sandukovsky

National Research Nuclear University MEPhI

Email: chernyshev@mephi.ru
Russian Federation, Moscow, 115409

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