质子与4He核碰撞反应中N*(1440)的共振激发
N* (1440)ResonanceProductionintheCollisionReactionofProtonand4HeNucleus
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摘要: 在介子交换模型下,考虑质子入射动能为2.8GeV时,对p+4He→p+π+4He反应中共振激发N* (1440)(Roper共振态)进行了研究,在π 介子与核子不变质量为1440MeV附近重现了Roper共振峰;得出了末态π 介子的角分布和动量分布,讨论了在兰州重离子冷却储存环(CSR)上开展该实验研究的可行性.Abstract: Basedonthemeson-exchangemodel,theexcitednucleonN* (1440)wasstudiedinthereactionchannelp+4He→p+π+4He,whenthekineticenergyoftheincomingprotonwas2.8GeV.ThepeakofRoperresonancewasreproducedperfectlynear1440MeVofinvariantmassoftheπNsystem,andtheangledistributionandthemomentumdistributionofthefinal-stateπpionwereobtained.ThefeasibilityofexperimentalstudyofN* (1440)resonanceattheCoolingStoreRing(CSR)ofLanzhouisdiscussed
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