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arXiv 2209.02162nucl-exnucl-th
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$^{25}$ F（-1 p）$^{24}$ O反应研究$^{25}$ F的核

The Core of $^{25}$F studied by the $^{25}$F(-1p)$^{24}$O reaction

H. L. Crawford, M. D. Jones, A. O. Macchiavelli, P. Fallon, D. Bazin, P. C. Bender, B. A. Brown, C. M. Campbell, R. M. Clark, M. Cromaz, B. Elman, A. Gade, J. D… 展开作者

H. L. Crawford, M. D. Jones, A. O. Macchiavelli, P. Fallon, D. Bazin, P. C. Bender, B. A. Brown, C. M. Campbell, R. M. Clark, M. Cromaz, B. Elman, A. Gade, J. D. Holt, R. V. F. Janssens, I. Y. Lee, B. Longfellow, S. Paschalis, M. Petri, A. L. Richard, M. Salathe, J. A. Tostevin, D. Weisshaar

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6 pages, 2 figures
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摘要：

在NSCL使用S800光谱仪研究了$^{25}$ F（$5/2^+) (-1p) ^{24}$ O）反应。基态到基态跃迁的实验光谱因子表明质子$d_{5/2}$强度与壳模型预期相比有很大的损耗。我们的结果支持Tang \textit{et al.}在RIBF研究$(p,2p)$反应中的发现。如果$^{24}$ O在$^{25}$ F中充当一个坚固的双魔核，那么$^{25}$ F和$^{24}$ O基态之间的重叠比预期的要小得多。我们解释的$d_{5/2}$质子耦合到一个四极声子的有效核心的粒子振动耦合（PVC）的框架内的结果。该方法通过要求具有$\hbarω_2$ = 3.2 MeV的声子能量的有效$^{24}$ O* 芯和$B(E2) ~ 2.7$ W.u.，比一个光秃秃的$^{24}$ O更柔软更集体。Nilsson变形平均场和PVC模型似乎都捕捉到了$^{25}$ F的有效核的性质，这表明额外的质子倾向于以这样一种方式使自由的、双魔的$^{24}$ O发生扭曲，使它要么轻微变形，要么成为四极振子。

英文摘要：

The $^{25}$F($5/2^+) (-1p) ^{24}$O reaction was studied at the NSCL using the S800 spectrometer. The experimental spectroscopic factor for the ground-state to ground-state transition indicates a substantial depletion of the proton $d_{5/2}$ strength compared to shell-model expectations. Our result supports the findings reported by Tang \textit{et al.}, from their study of the $(p,2p)$ reaction at RIBF. The overlap between the $^{25}$F and $^{24}$O ground-states is considerably less than anticipated if $^{24}$O acted as a robust and rigid doubly-magic core in $^{25}$F. We interpret the results within the framework of the Particle-Vibration Coupling (PVC) of a $d_{5/2}$ proton coupled to a quadrupole phonon of an effective core. This approach provides a good description of the experimental data by requiring an effective $^{24}$O* core with a phonon energy of $\hbarω_2$= 3.2 MeV, and a $B(E2) ~ 2.7$ W.u., softer and more collective than a bare $^{24}$O. Both the Nilsson deformed mean field and the PVC models appear to capture the properties of the effective core of $^{25}$F, suggesting that the additional proton tends to polarize the free, doubly magic $^{24}$O in such a way that it becomes either slightly deformed or a quadrupole vibrator.

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