| In-medium pion dispersion relation and medium correction of Nπ■Δ near the threshold energy of pion production |
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| 引用本文： | 崔莹,张英逊,李祝霞.In-medium pion dispersion relation and medium correction of Nπ■Δ near the threshold energy of pion production[J].中国物理C（英文版）,2021(4):344-358. |
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| 作者姓名： | 崔莹 张英逊 李祝霞 |
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| 作者单位： | China Institute of Atomic Energy;Guangxi Key Laboratory Breeding Base of Nuclear Physics and Technology |
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| 基金项目： | Supported by National Key R&D Program of China(2018 YFA0404404);National Natural Science Foundation of China(11875323,11875125,11475262,11961141003,11790323,11790324,11790325);the Continuous Basic Scientific Research Project(WDJC-2019-13,No BJ20002501). |
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| 摘 要： | Transport models cannot simultaneously explain very recent data on pion multiplicities and pion charged ratios from central collision of Sn+Sn at 0.27 A GeV.This stimulates further investigations on the pion dispersion relation,in-medium Nπ→Δ cross sections,and Δ→Nπ decay widths near the threshold energy or at subthreshold energy of pion production in isospin asymmetric nuclear matter.In this study,the pion dispersion relation,in-medium Nπ→Δ cross section,and Δ→Nπ decay width near the threshold energy are investigated in isospin asymmetric nuclear matter by using the one-boson-exchange model.With the consideration of the energy conservation effect,the in-medium Nπ→Δ cross sections are enhanced at s1/2 <1.11 GeV in a nuclear medium.The prediction of pion multiplicity and π-/π+ ratios near the threshold energy could be modified if this effect is considered in transport model simulations.
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| 关 键 词： | HIG collisions pion dispersion relation Nπ→△cross section △→Nπdecay width |
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