Investigation of the isoscalar response of 24Mg to 6Li scattering
Investigation of the isoscalar response of 24Mg to 6Li scattering
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24Mg 至 6Li 散射的等标量响应研究
DOI：
10.1103/physrevc.104.014607
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发表时间：
2021
影响因子：
3.1
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
Zamora J. C.;Sullivan C.;Zegers R. G. T.;...;Nobuyuki Kobayashi;et al.
背景：是一个处于基态的强变形核。在等标量巨单极子和四极子共振结构中可以观察到变形效应。也是一个众所周知呈现不同类型的团簇振荡模式的核。巨共振和团态都被等标量跃迁强烈填充。目的：提取、、和过渡优势。该探针是研究具有非常有利的共振-连续介质背景比的等标量核响应的有力工具。方法：测量光束能量为100 MeV/u时非弹性散射双微分截面的激发能范围和散射角。采用多极分解分析提取等标量、、和强度分布。结果：提取的多极强度与准粒子随机相近似计算的预测结果进行了比较。理论预测与实验数据相当吻合。强度也与文献中发现的反对称分子动力学计算结果进行了比较。实验数据中的一些峰值可能与聚类有关。结论：等标量巨单极子共振（ISGMR）和等标量巨四极子共振（ISGQR）分布存在基态变形效应。ISGMR强度在19 MeV和28 MeV左右分为两个峰值。ISGQR在20 MeV处显示出一个明显的峰值，在低能区展宽，与微观计算的预测相似。在响应中观察到簇态的激发特征。进一步的研究，包括粒子衰变测量，将需要确认观察到的峰的性质。
Background:is a strongly deformed nucleus in the ground state. Deformation effects can be observed in the structure of the isoscalar giant monopole and quadrupole resonances.is also a nucleus that is well known to present different types of cluster-oscillation modes. Both giant resonances and cluster states are strongly populated by isoscalar transitions.Purpose:To extract the,, andtransition strengths viascattering. Theprobe is a powerful tool for investigating the isoscalar nuclear response with a very favorable ratio of resonance-to-continuum background.Method:Double-differential cross sections ofinelastic scattering, at the beam energy of 100 MeV/u, were measured in the excitation-energy rangeand scattering angles. A multipole-decomposition analysis was performed for extracting the isoscalar,, andstrength distributions.Results:The extracted multipole strengths were compared with predictions from consistent quasiparticle random phase approximation calculations. The theoretical predictions are in fair agreement with the experimental data. Thestrength was also compared with results from antisymmetrized molecular dynamics calculations found in the literature. A few peaks in the experimental data might be associated with clustering in.Conclusions:Ground-state deformation effects were observed in the isoscalar giant monopole resonance (ISGMR) and isoscalar giant quadrupole resonance (ISGQR) distributions. The ISGMR strength is split in two peaks around 19 and 28 MeV. The ISGQR exhibits a pronounced peak at 20 MeV with a broadening at the low-energy region, similar to predictions from microscopic calculations. Signatures of excitation of cluster states were observed in theresponse. Further studies including particle-decay measurements will be required to confirm the nature of the observed peaks.