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Isospin and Spin-Isospin Modes in Charge-Exchange Reactions

机译:电荷交换反应中的同位旋和自旋同位旋模式

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摘要

The microscopic structure of the Gamow-Teller resonance (GTR) and spin-dipole resonance (SDR) in ~(208)Bi has been investigated in the ~(208)Pb(~3He,tp)~(207)Pb reaction at E(~3He) = 450 MeV and very forward scattering angles. The partial and total branching ratios and the escape widths for GTR and SDR decay to the residual neutron-hole states in ~(207)Pb were deduced. These are found to be in good agreement with recent theoretical estimates. The (~3He,tp) reaction on Pb at E(~3He) = 177 MeV was also studied in order to locate isovector monople strength corresponding to 2h#omega# transitions. Monople strength at excitation energies above 25 MeV was discovered and compared to calculated strength due to the isovector giant monopole resonance and the spin-flip isovector monopole resonance. Calculations in a normal-mode framework show that all isovector monopole strength can be accounted for if the branching ratio for decay by proton emission is 20percent.
机译:在〜(208)Pb(〜3He,tp)〜(207)Pb反应中,研究了〜(208)Bi中的Gamow-Teller共振(GTR)和自旋偶极共振(SDR)的微观结构。 (〜3He)= 450 MeV和非常向前的散射角。推导了〜(207)Pb中GTR和SDR向剩余中子-空穴态衰减的部分和总分支比以及逸出宽度。发现这些与最近的理论估计非常吻合。为了确定对应于2h#omega#跃迁的等矢量单重强度,还研究了E(〜3He)= 177 MeV下Pb上的(〜3He,tp)反应。发现在25 MeV以上的激发能下的单强度,并将其与等强度的巨型单极共振和自旋翻转等矢量单极共振引起的计算强度进行比较。在正常模式框架中的计算表明,如果质子发射引起的衰变的分支比为20%,则可以考虑所有等矢量单极强度。

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