arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.10112nucl-ex
收藏

对 $\mathrm{^{12}C}$ 激发态的多探针研究：厘清 Hoyle 态与 $E_{x} = 13$ MeV 之间单极强度的来源

Multi-probe study of excited states in $\mathrm{^{12}C}$: disentangling the sources of monopole strength between the Hoyle state and $E_{x} = 13$ MeV

iThemba LABS, National Research Foundation（iThemba实验室，国家研究基金会）；Department of Physics, University of Stellenbosch（斯泰伦博斯大学物理系）；Department of Physics, University of Oslo（奥斯陆大学物理系）；School of Physics, University of the Witwatersrand（威特沃特斯兰德大学物理学院）；NRC Kurchatov Institute（库尔恰托夫研究所）；Flerov Laboratory of Nuclear Reactions, JINR（杜布纳联合核研究所弗廖罗夫核反应实验室）；School of Physics and Astronomy, University of Birmingham（伯明翰大学物理与天文学院）；Nuclear Energy Group, ESRIG, University of Groningen（格罗宁根大学ESRIG核能组）；Department of Physics and Astronomy, University of the Western Cape（西开普大学物理与天文系）
K. C. W. Li, F. D. Smit, P. Adsley, R. Neveling, P. Papka, E. Nikolskii, J. W. Brümmer, L. M. Donaldson, M. Freer, M. N. Harakeh, F. Nemulodi, L. Pellegri, V. P… 展开作者

K. C. W. Li, F. D. Smit, P. Adsley, R. Neveling, P. Papka, E. Nikolskii, J. W. Brümmer, L. M. Donaldson, M. Freer, M. N. Harakeh, F. Nemulodi, L. Pellegri, V. Pesudo, M. Wiedeking, E. Z. Buthelezi, V. Chudoba, S. V. Förtsch, P. Jones, M. Kamil, J. P. Mira, G. G. O'Neill, E. Sideras-Haddad, B. Singh, G. F. Steyn, J. A. Swartz, I. T. Usman, J. J. van Zyl

备注：
25 pages (including appendix and bibliography), 16 figures
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

AI总结：

本研究利用多探针反应自洽分析$^{12}$C激发谱，发现在$E_x\sim 9$ MeV处存在过量单极强度，引入额外$0^+$态可显著改善拟合，该态可能是Hoyle态呼吸模式激发的主要候选者。

摘要：

了解 $\mathrm{^{12}C}$ 中低激发单极强度，尤其是 Hoyle 态，对于我们理解天体物理上重要的 $3α$ 反应以及 $α$ 粒子团簇结构至关重要。本研究利用 $\mathrm{^{12}C}(α, α^{\prime})\mathrm{^{12}C}$ 和 $\mathrm{^{14}C}(p, t)\mathrm{^{12}C}$ 反应来布居 $^{12}$C 中的态。我们对包含谱线形状的包容谱进行了自洽的同步分析，该分析考虑了核动力学和实验效应引起的畸变。结果发现了在 $E_{x} \sim 9$ MeV 处存在过量单极强度的明确证据，尤其是在 $0^{\circ}$ 的 $\mathrm{^{12}C}(α, α^{\prime})\mathrm{^{12}C}$ 反应中。这一额外强度无法由先前在 $E_{x} = 7$ 至 13 MeV 之间已确立的单极态所复现。在 $E_{x} \sim 9$ MeV 处增加一个额外的 $0^{+}$ 态可显著改善数据拟合，并且该态是所预言的 Hoyle 态呼吸模式激发的主要候选者。另一种可能是，这些结果表明需要一种更精细、具有物理动机的参数化方式来描述 $\mathrm{^{12}C}$ 中天体物理上重要的单极强度。

英文摘要：

Knowledge of the low-lying monopole strength in $\mathrm{^{12}C}$, the Hoyle state in particular, is crucial for our understanding of both the astrophysically important $3α$ reaction and of $α$-particle clustering. The $\mathrm{^{12}C}(α, α^{\prime})\mathrm{^{12}C}$ and $\mathrm{^{14}C}(p, t)\mathrm{^{12}C}$ reactions were employed to populate states in $^{12}$C. A self-consistent, simultaneous analysis of the inclusive spectra with lineshapes was performed, which accounted for distortion due to nuclear dynamics and experimental effects. Clear evidence was found for excess monopole strength at $E_{x} \sim 9$ MeV, particularly in the $\mathrm{^{12}C}(α, α^{\prime})\mathrm{^{12}C}$ reaction at $0^{\circ}$. This additional strength cannot be reproduced by the previously established monopole states between $E_{x} = 7$ and 13 MeV. An additional $0^{+}$ state at $E_{x} \sim 9$ MeV yielded a significantly improved fit of the data and is the leading candidate for the predicted breathing-mode excitation of the Hoyle state. Alternatively, the results may suggest that a more sophisticated, physically motivated parameterization of the astrophysically important monopole strengths in $\mathrm{^{12}C}$ is required.

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。

↑