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Measurements of differential and angle-integrated cross sections for the 10B(n, α)7Li reaction in the neutron energy range from 1.0 eV to 2.5 MeV
Haoyu Jiang, Wei Jiang, Huaiyong Bai, Zengqi Cui, Guohui Zhang, Ruirui Fan, Han Yi, Changjun Ning, Liang Zhou, Jingyu Tang, Qi An, Jie Bao, Yu Bao, Ping Cao, Haolei Chen, Qiping Chen, Yonghao Chen, Yukai Chen, Zhen Chen, Changqing Feng, Keqing Gao, Minhao Gu, Changcai Han, Zijie Han, Guozhu He, Yongcheng He, Yang Hong, Hanxiong Huang, Weiling Huang, Xiru Huang, Xiaolu Ji, Xuyang Ji, Zhijie Jiang, Hantao Jing, Ling Kang, Mingtao Kang, Bo Li, Chao Li, Jiawen Li, Lun Li, Qiang Li, Xiao Li, Yang Li, Rong Liu, Shubin Liu, Xingyan Liu, Guangyuan Luan, Qili Mu, Binbin Qi, Jie Ren, Zhizhou Ren, Xichao Ruan, Zhaohui Song, Yingpeng Song, Hong Sun, Kang Sun, Xiaoyang Sun, Zhijia Sun, Zhixin Tan, Hongqing Tang, Xinyi Tang, Binbin Tian, Lijiao Wang, Pengcheng Wang, Qi Wang, Taofeng Wang, Zhaohui Wang, Jie Wen, Zhongwei Wen, Qingbiao Wu, Xiaoguang Wu, Xuan Wu, Likun Xie, Yiwei Yang, Li Yu, Tao Yu, Yongji Yu, Linhao Zhang, Qiwei Zhang, Xianpeng Zhang, Yuliang Zhang, Zhiyong Zhang, Yubin Zhao, Luping Zhou, Zuying Zhou, Danya
Published:   , doi: 10.1088/1674-1137/43/12/124002
Abstract:
Differential and angle-integrated cross sections for the 10B(n, α)7Li, 10B(n, α0) 7Li and 10B(n, α1) 7Li* reactions have been measured at CSNS Back-n white neutron source. Two enriched (90%) 10B samples 5.0 cm in diameter and ~85.0 μg/cm2 in thickness each with an aluminum backing were prepared, and back-to-back mounted at the sample holder. The charged particles were detected using the silicon-detector array of the Light-charged Particle Detector Array (LPDA) system. The neutron energy En was determined by TOF (time-of-flight) method, and the valid α events were extracted from the En-Amplitude two-dimensional spectrum. With 15 silicon detectors, the differential cross sections of α-particles were measured from 19.2° to 160.8°. Fitted with the Legendre polynomial series, the (n, α) cross sections were obtained through integration. The absolute cross sections were normalized using the standard cross sections of the 10B(n, α)7Li reaction in the 0.3 − 0.5 MeV neutron energy region. The measurement neutron energy range for the 10B(n, α)7Li reaction is 1.0 eV≤En < 2.5 MeV (67 energy points), and for the 10B(n, α0) 7Li and 10B(n, α1) 7Li* reactions is 1.0 eV ≤ En < 1.0 MeV (59 energy points). The present results have been analyzed by the resonance reaction mechanism and the level structure of the 11B compound system, and compared with existing measurements and evaluations.
Recalibration of the binding energy of hypernuclei measured in emulsion experiments and its implications
Peng Liu, Jinhui Chen, Declan Keane, Zhangbu Xu, Yu-Gang Ma
Published:   , doi: 10.1088/1674-1137/43/12/124001
Abstract:
The \begin{document}$ \Lambda $\end{document} separation energy for \begin{document}$ \Lambda $\end{document}-hypernuclei, denoted \begin{document}$ B_\Lambda $\end{document}, measured in 1967, 1968, and 1973 are recalibrated using the current best mass estimates for particles and nuclei. The recalibrated \begin{document}$ B_\Lambda $\end{document} are systematically larger (except in the case of \begin{document}$ .6_\Lambda $\end{document}He) than the original published values by about 100 keV. The effect of this level of recalibration is very important for light hypernuclei, especially for the hypertriton. The early \begin{document}$ B_\Lambda $\end{document} values measured in 1967, 1968, and 1973 are widely used in theoretical research, and the new results provide better constraints on the conclusions from such studies.
The weak cosmic censorship conjecture and thermodynamics in the quintessence AdS black hole under charge particle absorption
Ke-Jian He, Xin-Yun Hu, Xiao-Xiong Zeng
Published:   , doi: 10.1088/1674-1137/43/12/125101
Abstract:
Considering the cosmological constant as the pressure, we mainly study the laws of thermodynamics and weak cosmic censorship conjecture in the Reissner-Nordström-AdS black hole surrounded by quintessence dark energy under charged particle absorbtion. The first law of thermodynamics is found to be valid as a particle is absorbed by the black hole. The second law however is found to be violated for the extremal and near-extremal black holes since the entropy of these black hole decrease. Moreover, we find that the extremal black hole do not change it configuration in the extended phase space, implying that the weak cosmic censorship conjecture is valid. Remarkably, the near-extremal black hole can be overcharged beyond the extremal condition under charged particle absorption. That is, the cosmic censorship conjecture could be violated for the near-extremal black hole in the extended phase space. To make a comparison, we also discuss the first law, second law as well as the weak cosmic censorship conjecture in the normal phase space, and find that all of them are valid in this case.
Is the X(3872) a bound state?
Pablo G. Ortega, Enrique Ruiz Arriola
Published:   , doi: 10.1088/1674-1137/43/12/124107
Abstract:
All existing experimental evidence of the bound state nature of the \begin{document}$X(3872)$ \end{document} relies on considering its decay products with a finite experimental spectral mass resolution which is typically \begin{document}$\Delta m \geqslant 2 $ \end{document} MeV and much larger than its alleged binding energy, \begin{document}$B_X=0.00\,(18)$ \end{document} MeV. On the other hand, we have found recently that there is a neat cancelation in the \begin{document}$1^{++}$ \end{document} channel for the invariant \begin{document}$D {\bar D}^*$ \end{document} mass around the threshold between the continuum and bound state contribution. This is very much alike a similar cancelation in the proton-neutron continuum with the deuteron in the \begin{document}$1^{++}$ \end{document} channel. Based on comparative fits of experimental cross section deuteron and \begin{document}$X(3872)$ \end{document} prompt production in pp collisions data with a finite \begin{document}$p_T$ \end{document} to a common Tsallis distribution we find a strong argument questioning the bound state nature of the state but also explaining the large observed production rate likely consistent with a half-bound state.
The structure study of neutron-rich calcium isotopes by shell model with realistic effective interactions
Xiao-Bao Wang, Yu-Hang Meng, Ya Tu, Guo-Xiang Dong
Published:   , doi: 10.1088/1674-1137/43/12/124106
Abstract:
In this work, we focused on the structure study of neutron-rich calcium isotopes, by shell model with realistic interactions. CD-Bonn and Kuo-Brown (KB) interactions are used. As they lack three-body forces, the direct use of them leads to poor calculation results. We have tested whether or not the adjustments of single particle energies (SPEs) according to single particle states would be enough to include three-body correlations empirically. It turns out that CD-Bonn interaction after the SPE-adjustment can give good agreements with data of energies and spectroscopy. For KB interaction, both SPEs and monopole terms require adjustments. Thus, the monopole problem is less serious for modern realistic interactions which include higher-order perturbations till the third order. We also test the effect of non-central force on shell structure. It is found that the effect of tensor force in CD-Bonn interaction is weaker than that in KB interaction.
Isospin asymmetry effect determinations on α-decay
O. N. Ghodsi, B. A. Gheshlagh
Published:   , doi: 10.1088/1674-1137/43/12/124105
Abstract:
In this work, we compared the effect of the isospin asymmetry of proton and neutron density distributions corresponding to the Neutron skin-type (NST) case and Hartree-Fock formalism (HF) on the half-life of alpha emitters with the atomic number in the range of \begin{document}$82\leqslant Z\leqslant 92$\end{document}. It is illustrated that the NST case and HF formalism based on the Skyrme-SLy4 effective interaction reveal different isospin asymmetry for selected alpha emitters. In addition, the obtained results reveal an increase of about 30% for α-decay widths in the NST case in comparison with their corresponding values obtained by HF formalism. The standard deviations for calculated half-lives within NST case and HF formalism are about 0.438 and 0.391 respectively.