A SYSTEMATIC DISTORTED WAVE IMPULSE APPROXIMATION ANALYSIS OF THE CONVENTIONAL MECHANISM FOR PION DOUBLE CHARGE EXCHANGE

PAN Ling-Jun; JIANG Huan-Qing; ZOU Bing-Song

Chinese Physics C> 1990, Vol. 14> Issue(11) : 1014-1022

A SYSTEMATIC DISTORTED WAVE IMPULSE APPROXIMATION ANALYSIS OF THE CONVENTIONAL MECHANISM FOR PION DOUBLE CHARGE EXCHANGE

Institute of High Energy Physics,Academia Sinica,Beijing2 Institute of Theoretical Physics,Academia,sinica,Beijing

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

References

[1]

R. Gilman, in Proc. LAMPF Workshop on pion double charge, excharge, LA-10550-C (1985), p. 14.[2] Zou Bingsong and Jiang Huanqing, High Energy Phys. and Nucl. Phys. (allerton Press, USA), 12(1988),271.[3] G. E. Brown et al., Phys. Rep., 50(1979), 227.[4] Gibbs et al., in Ref. [I] , p. 90.[5] M. bleszynski and R. J. Glauber, Phys. Rev., C36(1987), 681.[6] E. R. Siciliano, M. B. Johnson and H. Sarafian, LANL Report No. LA-UR-89-3302.[7] G. Rowe et al., Phys. Rev., C18(1978), 584.[8] M . B. Johnson et al., Phys. Rev, C27(1983), 730.[9] H. C. Chiang and M. B. Johnson, Phys. Rev., C32(1985), 531.[10] R. A. Eisenstein and G. A. Miller, Comp. Phys. Commun., 8(1974), 130.[11] T. Karapiperis and M. Kobayashi, Phys. Rev. Lett., 54(1985), 1230; Ann. Phys., 177(1987), 1 .[12] G. E. Brown et al., Nucl. Phys, A286(1977), 191.[13] G. A. Miller and E. Spencer, Ann. Phys, 100(1976), 562.[14] H. Q. Song, H. F. Wu and T. T. S. Ruo, Phys. Rev., C40(1989), 2260. .[15] E. Oset, D. Strottman and G. E. Brown, Phys. Lett., B73(1978), 393.[16] N. Auerbach et al., Phys. Rev., C38(1988), 1277.[17] A. Wirzba et al.. Phys. Rev., C40(1989), 2745.[18] S. J. Greene et al., Phys. Rev., C30(1984), 2003.[19] G. A. Miller, Phys. Rev. Lett., 53(1984), 2008.[20] H. C. Chiang and B. S. Zou. Nucl. Phys., A496(1989), 739.[21] C. R. Ching, T. H. Ho, B. S. Zou and M. B. Johnson, Connun. Theor. Phys.,11(1989), 171; C. R.Ching, T. H. Ho and B. S. Zou, Preprints AS-ITP-88-039, AS-ITP-90-01, to be published in Nucl.Phys. A.

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[19]	Liu Xian-hui , Wu Zong-en , Huang Chao-hui , Li Yang-guo . π-NUCLEAR DOUBLE CHARGE EXCHANGE REACTION AND NUCLEAR STRUCTURE. Chinese Physics C, 1980, 4(3): 394-397.
[20]	Liu Bo , Zhang Zong-ye . THE ISOBAR EXCITATION MECHANISM OF THE PION SINGLE CHARGE EXCHANGE REACTION. Chinese Physics C, 1980, 4(6): 767-770.

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PAN Ling-Jun, JIANG Huan-Qing and ZOU Bing-Song. A SYSTEMATIC DISTORTED WAVE IMPULSE APPROXIMATION ANALYSIS OF THE CONVENTIONAL MECHANISM FOR PION DOUBLE CHARGE EXCHANGE[J]. Chinese Physics C, 1990, 14(11): 1014-1022.

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Received: 1900-01-01
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

A SYSTEMATIC DISTORTED WAVE IMPULSE APPROXIMATION ANALYSIS OF THE CONVENTIONAL MECHANISM FOR PION DOUBLE CHARGE EXCHANGE

Corresponding author: PAN Ling-Jun,

Institute of High Energy Physics,Academia Sinica,Beijing2 Institute of Theoretical Physics,Academia,sinica,Beijing

Received Date: 1900-01-01

Accepted Date: 1900-01-01

Available Online: 1990-11-05

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

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A SYSTEMATIC DISTORTED WAVE IMPULSE APPROXIMATION ANALYSIS OF THE CONVENTIONAL MECHANISM FOR PION DOUBLE CHARGE EXCHANGE

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