The $A(K^-_{stop},π^\pmΣ^\mp)A'$ reaction on p-shell nuclei
FINUDA Collaboration, M. Agnello, L. Benussi, M. Bertani, H. C. Bhang, G. Bonomi, E. Botta, M. Bregant, T. Bressani, S. Bufalino, L. Busso, D. Calvo, P. Camerin… 展开作者
FINUDA Collaboration, M. Agnello, L. Benussi, M. Bertani, H. C. Bhang, G. Bonomi, E. Botta, M. Bregant, T. Bressani, S. Bufalino, L. Busso, D. Calvo, P. Camerini, B. Dalena, F. DeMori, G. D'Erasmo, F. L. Fabbri, A. Feliciello, A. Filippi, E. M. Fiore, A. Fontana, H. Fujioka, P. Genova, P. Gianotti, N. Grion, V. Lucherini, S. Marcello, N. Mirfakhrai, F. Moia, P. Montagna, O. Morra, T. Nagae, H. Outa, A. Pantaleo, V. Paticchio, S. Piano, R. Rui, G. Simonetti, R. Wheadon, A. Zenoni
备注：
14 pages, 5 figures, accepted for publication in Phys. Lett. B
这封信涉及p壳层核中$K^-_{stop}A\rightarrow π^\pmΣ^\mp A'$反应的研究，即，$^{6,7}Li$、$^9Be$、$^{13}C$和$^{16}O$。将$π^\pmΣ^\mp / K^-_{stop}$发射率报告为$A$的函数。这些利率进行了讨论，与以前的调查结果相比。发现p壳层核中的比率$π^-Σ^+/π^+Σ^-$与氢上的比率相差很大，这为亚阈值$Λ(1405)$可能产生的大的介质效应提供了支持。本文还讨论了瞬发π介子和自由σ的连续动量谱，以及$π^\pmΣ^\mp$的质量缺失行为和与反应机制的联系。用于研究的仪器是在DA $Φ$ NE $ϕ$工厂（LNF-INFN，意大利）运行的FINUDA光谱仪。
英文摘要：
This letter is concerned with the study of the $K^-_{stop}A\rightarrow π^\pmΣ^\mp A'$ reaction in p-shell nuclei, i.e., $^{6,7}Li$, $^9Be$, $^{13}C$ and $^{16}O$. The $π^\pmΣ^\mp / K^-_{stop}$ emission rates are reported as a function of $A$. These rates are discussed in comparison with previous findings. The ratio $π^-Σ^+/π^+Σ^-$ in p-shell nuclei is found to depart largely from that on hydrogen, which provides support for large in-medium effects possibly generated by the sub-threshold $Λ(1405)$. The continuum momentum spectra of prompt pions and free sigmas are also discussed as well as the $π^\pmΣ^\mp$ missing mass behavior and the link with the reaction mechanism. The apparatus used for the investigation is the FINUDA spectrometer operating at the DA$Φ$NE $ϕ$-factory (LNF-INFN, Italy).
Shell gaps and pn pairing interaction in N = Z nuclei
我们分析了观察到的壳层间隙N=Z核确定的结合能差。结果表明，壳层能隙可以用单粒子能级间距、类核子配对和质子-中子配对相互作用的综合贡献来描述。这一结论与Chasman在Phys. Rev. Lett. 99（2007）082501。对于双闭壳层N=Z核，用Woods-Saxon势计算的单粒子能级间距与从观察到的壳层能隙中减去nn对相互作用得到的结果非常接近.对于亚封闭或非封闭壳层N=Z核，pn配对相互作用被证明是重要的观察到的壳层间隙。
From closed shells to open shells: Coupled-cluster calculations of atomic nuclei
Johannes Gutenberg-Universität Mainz（美因茨约翰内斯·古腾堡大学）；Facility for Rare Isotope Beams, Michigan State University（密歇根州立大学稀有同位素束设施）；Oak Ridge National Laboratory（橡树岭国家实验室）；Université Libre de Bruxelles（布鲁塞尔自由大学）；KU Leuven（荷语鲁汶大学）；Helmholtz-Institut Mainz（美因茨亥姆霍兹研究所）；CEA, Université Paris-Saclay（法国原子能和替代能源委员会，巴黎萨克雷大学）；University of Tennessee（田纳西大学）
