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Theoretical achievements and questions in the quenching problem

Quenching問題に対する理論研究の進展と課題

吉田 数貴   

Yoshida, Kazuki

本講演では、ノックアウト反応理論の立場からQuenching問題に関する近年の成功と残る問題について議論する。ノックアウト反応の観測量から分光学的因子を得るには、その反応を記述する理論の定量性が重要である。この点について、最近行った、ノックアウト反応を記述する理論である歪曲波インパルス近似(DWIA), Transfer-to-the-continuum模型, Faddeev/AGS法の比較研究の成果を報告する。また、Quenching問題解決に向けての反応理論における今後の課題についても議論する。

In this talk I will overview recent achievements and remaining questions to resolve the quenching problem, from knockout reaction theory point of view in particular. For extracting spectroscopic factors from knockout experiment, quantitative accuracy of the reaction theory adopted to reaction analysis is, of course, essential. I will introduce our recent study on validity of three reaction theories for knockout analysis, i.e., Distorted Wave Impulse Approximation (DWIA), Transfer-to-the-Continuum model (TC), and Faddeev/Alt-Grassberger-Sandhas method (FAGS). In this study it has been shown that DWIA, which is the model most commonly adopted to knockout reaction analyses, gives consistent knockout cross section with those of TC and FAGS, once the same ingredients are given to the reaction calculation. I also introduce a possible reason for the systematic quenching found in nucleon removal reaction analysis. The key will be the adiabatic approximation.

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