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arXiv 2302.07490nucl-exnucl-th
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$^{40}$Ca的电偶极极化率

Electric dipole polarizability of $^{40}$Ca

R. W. Fearick, P. von Neumann-Cosel, S. Bacca, J. Birkhan, F. Bonaiti, I. Brandherm, G. Hagen, H. Matsubara, W. Nazarewicz, N. Pietralla, V. Yu. Ponomarev, P. -… 展开作者

R. W. Fearick, P. von Neumann-Cosel, S. Bacca, J. Birkhan, F. Bonaiti, I. Brandherm, G. Hagen, H. Matsubara, W. Nazarewicz, N. Pietralla, V. Yu. Ponomarev, P. -G. Reinhard, X. Roca-Maza, A. Richter, A. Schwenk, J. Simonis, A. Tamii

AI总结:

本研究通过质子非弹性散射实验结合光吸收数据测定$^{40}$Ca的电偶极极化率,结合$^{48}$Ca的测量值检验核结构理论,为中子皮和物态方程研究提供约束。

摘要:

大阪大学核物理研究中心(RCNP)通过极小角度的质子非弹性散射实验,测定了5至25 MeV范围内$^{40}$Ca的电偶极强度分布。结合更高激发能下的总光吸收数据,研究人员提取出$^{40}$Ca的电偶极极化率$α_\text{D}$($^{40}$Ca) = 1.92(17) fm³。该结果与已测得的$^{48}$Ca的$α_{\rm D}$一同,为包括采用手征有效场论相互作用的耦合团簇计算、以及最新的能量密度泛函在内的现代理论方法提供了严格检验。研究表明,对于该中等质量区的原子核,理论能够很好地描述其电偶极极化率,这对$^{48}$Ca的中子皮及相关的物态方程参量具有重要约束作用。

英文摘要:

The electric dipole strength distribution in $^{40}$Ca between 5 and 25 MeV has been determined at RCNP, Osaka, from proton inelastic scattering experiments at very forward angles. Combined with total photoabsorption data at higher excitation energy, this enables an extraction of the electric dipole polarizability $α_\mathrm{D}$($^{40}$Ca) = 1.92(17) fm$^3$. Together with the measured $α_{\rm D}$ in $^{48}$Ca, it provides a stringent test of modern theoretical approaches, including coupled cluster calculations with chiral effective field theory interactions and state-of-the art energy density functionals. The emerging picture is that for this medium-mass region dipole polarizabilities are well described theoretically, with important constraints for the neutron skin in $^{48}$Ca and related equation of state quantities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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