## Abstract

The theory of energy straggling attempts to calculate F(E,S), where F(E,S)dE is the fraction of the heavy charged particles which have an energy between E and E+dE after a path length S has been traversed in absorbing medium. This paper develops a method of calculating F(E,S) for path lengths large enough so that F(E,S) is almost Gaussian. The method remains valid until a large fraction of the particles run out of energy. The theory is applied to calculations of F(E,S) for 50-MeV protons in Be and for 5.3-MeV α particles in air. The calculations for α particles in air are in good agreement with the experimental results of Rotondi and Gieger. The theory is also in agreement with numberical calculations by Tschalär.

Original language | English |
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Pages (from-to) | 611-623 |

Number of pages | 13 |

Journal | Physical Review |

Volume | 185 |

Issue number | 2 |

DOIs | |

State | Published - 1969 |