Nuclear Fermi Motion Effect on Pion Double Charge Exchange

QING Cheng-Rui; HE Zhuo-Xiu; ZOU Bing-Song; JIANG Huan-Qing

Chinese Physics C> 1991, Vol. 15> Issue(1) : 46-51

Nuclear Fermi Motion Effect on Pion Double Charge Exchange

Institute of Theoretical Physics,Academia Sinica,Beijing 1000801 Institute of High Energy Physics,Academia Sinica,Beijing 100039

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Abstract：
The influence of nuclear Fermi motion on the conventional mechanism of pion double charge exchange (DCX) is examined.Concrete calculations of the 0° excitation function over the energy region 0—300MeV are performed for the double isobaric analog DCX transition on ¹⁴C.The calculated results coincide very well with the experimental data for the energies above 100MeV,but are about a factor of 2—3 smaller than the experimental data around 50MeV.It indicates that the pure conventional mechanism seems incapable to fully explain the anomalous behavior of the low energy DCX,and some new mechanisms are needed.

References

[1]

Proceeding of the LAMPF Workshop an Pion Double Charge Exchange, LA-10550-C (1985).[2] K. K. Seth, Nucl. Phys., A478(1988),59Ic.[3] W. B. Gibbs et al., in Ref. [1]，p. 90.[4] M. Bleszynski and R. J. Glauber, Phys. Rev., C36(1987), 681.[5] E. R. Siciliano, M. B. Johnson and H. Sarafian, Preprint LA-UR-89-3302, to be published in Ann. Phys.(July 1990).[6] G. A.Miller, Phys, Rev. Lett., 53(1984), 2008.[7] H.C.Chiang and B. S. Zou, Nucl. Phys., .41496(1989), 739.[8] a) C. R. Ching, T. H. Ho, B. S. Zou and M. B. Johnson, Commun. Theot. Phys. 11(1989) 171; b) C.R. Ching, T, H. Ho and B. S. Zou, Nucl. I'hys., A (to be published).[9] N. Auerbach et al., Phys. Rev., C38(1988), 1277.[10] 潘玲君、姜焕清、邹冰松，《高能物理与核物理》14(1990)，1014.[11] G. Rowe, M. Salomon and R. H. Laudau, Phys. Rev., C18(1978), 584.[12] G. A. Miller and J. E. Spencer, Ann. Phys., 100 (1976), 562.[13] A. Wirzba et al., Phys, Rev., C40(1989), 2745.[14] G. E. Brawn et al., Nucl. Phys., A286(1977), 191.

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QING Cheng-Rui, HE Zhuo-Xiu, ZOU Bing-Song and JIANG Huan-Qing. Nuclear Fermi Motion Effect on Pion Double Charge Exchange[J]. Chinese Physics C, 1991, 15(1): 46-51.

QING Cheng-Rui, HE Zhuo-Xiu, ZOU Bing-Song and JIANG Huan-Qing. Nuclear Fermi Motion Effect on Pion Double Charge Exchange[J]. Chinese Physics C, 1991, 15(1): 46-51. shu

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Received: 1900-01-01
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Nuclear Fermi Motion Effect on Pion Double Charge Exchange

Corresponding author: QING Cheng-Rui,

Institute of Theoretical Physics,Academia Sinica,Beijing 1000801 Institute of High Energy Physics,Academia Sinica,Beijing 100039

Received Date: 1900-01-01
Accepted Date: 1900-01-01
Available Online: 1991-01-05

Abstract: The influence of nuclear Fermi motion on the conventional mechanism of pion double charge exchange (DCX) is examined.Concrete calculations of the 0° excitation function over the energy region 0—300MeV are performed for the double isobaric analog DCX transition on ¹⁴C.The calculated results coincide very well with the experimental data for the energies above 100MeV,but are about a factor of 2—3 smaller than the experimental data around 50MeV.It indicates that the pure conventional mechanism seems incapable to fully explain the anomalous behavior of the low energy DCX,and some new mechanisms are needed.