JAERI-Research 2003-004

A Systematics of Fission Product Mass Yields with 5 Gaussian Functions

Jun-ichi KATAKURA

Department of Nuclear Energy System
Tokai Research Establishment
Japan Atomic Energy Research Institute
Tokai-mura, Naka-gun, Ibaraki-ken

A systematics of fission product mass yields is proposed. The systematics is based on Moriyama-Ohnishi systematics developed about 30 years ago. The parameter set of the systematics is newly determined by examining measured data taken after Moriyama-Ohnishi systematics was released. The systematics using the newly determined parameter set is employed to calculate mass distributions of various kinds of fission and compare them with measured data. The comparison shows rather good agreement between them from spontaneous fission to high energy particle induced fission.

Contents

1. Introduction
2. Moriyama-Ohnishi Systematics
  2.1 Outline of the Moriyama-Ohnishi Systematics
  2.2 Problems of the Moriyama-Ohnishi Systematics
3. Parameter Search for New Systematics
4. Calculation Using New Parameter Set
5. Summary
Acknowledgements
References