π-NUCLEAR DOUBLE CHARGE EXCHANGE REACTION AND NUCLEAR STRUCTURE

LI YANG-GUO; WU ZONG-EN; HUANG CHAO-HUI; LI YANG-GHO

Chinese Physics C> 1981, Vol. 5> Issue(2) : 157-168

π-NUCLEAR DOUBLE CHARGE EXCHANGE REACTION AND NUCLEAR STRUCTURE

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Abstract：
Using coherent fluctuation nuclear model and Glauber's multiple scattering theory,the double charge exchange (DCE) reaction cross sections for π⁺ on ¹⁶O and on ¹⁶O are calculated. The results show that, owing to the paring effect, the probability of the double nucleon transition between the isospin non-analogue states increases remarkably: the calculated values of the ratio of a σ ¹⁸O (π⁺, π^-) ¹⁸Ne_g.s. to σ (¹⁶O (π⁺,π^-) ¹⁶Ne)_g.s. fit the experimental data quite well. It also shows that, for fitting the experimental data, the magnitude of the 2p-2h configuration components exsited in ¹⁶O ground state would not be too large. The effect of the intermediate states in multiple stage processes is estimated, which shows that the contribution of these processes to the DCE reaction is rather small.

References

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R. L. Burman et al., Phys. Rev., C17(1978), 1774.[2] T. Marks et al., Phya. Rev. Lett., 38(1977), 149.[3] R. T. Holt et al., Phys. Lett., 69B(1977), 55.[4] C. Perrin et al., Phys. Lett., 63B(1977), 301.[5] Kamal, A. Seth et al., Phys, Rev, Lett,, 41(1978), 1589.[6] 张宗烨等,物理学报,26(1977). 54.[7] R. J. Glauber, Lecture in Theoratical Phyaics, 1(1958), 315.李扬国等,中国科学,18(1975), 38.[8] 刘宪辉等,高能物理与核物理,3(1979), 434.[9] J. M. Mckinley, Rev, Mod. Phys., 35(1963), 788.[10] T. 8. H. Lee et al., Phys. Rev. Lett., 39(1977), 1307.[11] S. J. Grecn et al., 8th Inter. Conf. on High Energy Phyaica and Nuclear structure, 1979, 1E23.

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LI YANG-GUO, WU ZONG-EN, HUANG CHAO-HUI and LI YANG-GHO. π-NUCLEAR DOUBLE CHARGE EXCHANGE REACTION AND NUCLEAR STRUCTURE[J]. Chinese Physics C, 1981, 5(2): 157-168.

LI YANG-GUO, WU ZONG-EN, HUANG CHAO-HUI and LI YANG-GHO. π-NUCLEAR DOUBLE CHARGE EXCHANGE REACTION AND NUCLEAR STRUCTURE[J]. Chinese Physics C, 1981, 5(2): 157-168. shu

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Received: 1979-09-15
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

π-NUCLEAR DOUBLE CHARGE EXCHANGE REACTION AND NUCLEAR STRUCTURE

Received Date: 1979-09-15
Accepted Date: 1900-01-01
Available Online: 1981-04-05

Abstract: Using coherent fluctuation nuclear model and Glauber's multiple scattering theory,the double charge exchange (DCE) reaction cross sections for π⁺ on ¹⁶O and on ¹⁶O are calculated. The results show that, owing to the paring effect, the probability of the double nucleon transition between the isospin non-analogue states increases remarkably: the calculated values of the ratio of a σ ¹⁸O (π⁺, π^-) ¹⁸Ne_g.s. to σ (¹⁶O (π⁺,π^-) ¹⁶Ne)_g.s. fit the experimental data quite well. It also shows that, for fitting the experimental data, the magnitude of the 2p-2h configuration components exsited in ¹⁶O ground state would not be too large. The effect of the intermediate states in multiple stage processes is estimated, which shows that the contribution of these processes to the DCE reaction is rather small.