Abstract
Line shapes broadened by theγ-ray emission are described in the coordinate frame, in which a quantization axis is chosen to be the direction of the center of mass scattering angle of a decaying nucleus. In this coordinate frame the line shapes can be described only by diagonal density matrix elements for finite values of kinematic factork. The method of this analysis has been applied to the single and mutual excitations of the first 2+ state of12C in the12C+12C inelastic scattering.
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We wish to thank Drs. E. Takekoshi, M. Sawada, K. Nagano, T. Tachikawa, S. Kubono and M. Tanaka for their help in measuring the line shape. Special thanks are due to the operating crew of the JAERI tandem accelerator for their efforts to obtain stable and intense beams.