A Systematic DWIA Analysis of the Conventional Mechanism for Pion Double Charge Exchange

Pan Lingjun; Jiang Huanqing; Zou Bingsong

Chinese Physics C> 1991, Vol. 15> Issue(S1) : 51-61

A Systematic DWIA Analysis of the Conventional Mechanism for Pion Double Charge Exchange

1 Institute of High Energy Physics, the Chinese Academy of Sciences, Beijing, China;
2 Institute of Theoretical Physics, the Chinese Academy of Sciences, Beijing, China

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Abstract：
In the framework of the distorted wave impulse approximation,a systematic analysis is performed for the contribution of the conventional mechanism to the double charge exchange reaction to the double isobaric analog state. The effects of distortions of pions, nuclear wave functions, short-range correlation functions, parameters of the form factors, the spin-dependent term in the pion-nucleon amplitude, etc. are examined. It is shown that all these elements are very important and not negligible for the conventional mechanism. But after combining the effects of all these elements, the conventional mechanism is still not able to reproduce the experimental excitation functions and angular distributions for the energy region of 0-300 MeV. Therefore, the effects of some other mechanisms should be added.
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Pan Lingjun, Jiang Huanqing and Zou Bingsong. A Systematic DWIA Analysis of the Conventional Mechanism for Pion Double Charge Exchange[J]. Chinese Physics C, 1991, 15(S1): 51-61.

Pan Lingjun, Jiang Huanqing and Zou Bingsong. A Systematic DWIA Analysis of the Conventional Mechanism for Pion Double Charge Exchange[J]. Chinese Physics C, 1991, 15(S1): 51-61. shu

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Received: 1990-04-10

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Supported in part by the National Natural Science Foundation of China.

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

A Systematic DWIA Analysis of the Conventional Mechanism for Pion Double Charge Exchange

1 Institute of High Energy Physics, the Chinese Academy of Sciences, Beijing, China;
2 Institute of Theoretical Physics, the Chinese Academy of Sciences, Beijing, China

Received Date: 1990-04-10

Fund Project: Supported in part by the National Natural Science Foundation of China.

Abstract: In the framework of the distorted wave impulse approximation,a systematic analysis is performed for the contribution of the conventional mechanism to the double charge exchange reaction to the double isobaric analog state. The effects of distortions of pions, nuclear wave functions, short-range correlation functions, parameters of the form factors, the spin-dependent term in the pion-nucleon amplitude, etc. are examined. It is shown that all these elements are very important and not negligible for the conventional mechanism. But after combining the effects of all these elements, the conventional mechanism is still not able to reproduce the experimental excitation functions and angular distributions for the energy region of 0-300 MeV. Therefore, the effects of some other mechanisms should be added.