分类： 物理学 >> 核物理学 提交时间： 2023-06-26
摘要： The possible exotic nuclear properties in the neutron-rich Ca, Ni, Zr, and Sn isotopes are examined with the continuum Skyrme HartreeFockBogoliubov theory in the framework of the Green's function method. The pairing correlation, the couplings with the continuum, and the blocking effects for the unpaired nucleon in odd-A nuclei are properly treated. The Skyrme interaction SLy4 is adopted for the ph channel and the density-dependent interaction is adopted for the pp channel, which well reproduce the experimental two- neutron separation energies S2n and one-neutron separation energies Sn. It is found that the criterion Sn > 0 predicts a neutron drip line with neutron numbers far smaller than those for S2n > 0. Owing to the unpaired odd neutron, the neutron pairing energies Epair in odd-A nuclei are far lower than those in the neighboring even-even nuclei. By investigating the single-particle structures, the possible halo structures in the neutron#2; rich Ca, Ni, and Sn isotopes are predicted, where sharp increases in the root-mean-square (rms) radii with signifificant deviations from the traditional r A 1/3 rule and diffuse spatial density distributions are observed. Analyzing the contributions of various partial waves to the total neutron density lj (r)/(r) reveals that the orbitals located around the Fermi surfaceparticularly those with small angular momentasignifificantly affect the extended nuclear density and large rms radii. The number of neutrons N (N0) occupying above the Fermi surface n (continuum threshold) is discussed, whose evolution as a function of the mass number A in each isotope is consistent with that of the pairing energy, supporting the key role of the pairing correlation in halo phenomena.
分类： 天文学 >> 天文仪器与技术 提交时间： 2016-04-27
摘要： AstroCloud is a cyber-Infrastructure for Astronomy Research initiated by Chinese Virtual Observatory (China-VO) under funding support from NDRC (Na- tional Development and Reform commission) and CAS (Chinese Academy of Sci- ences). Tasks such as proposal submission, proposal peer-review, data archiving, data quality control, data release and open access, Cloud based data processing and analyz- ing, will be all supported on the platform. It will act as a full lifecycle management system for astronomical data and telescopes. Achievements from international Virtual Observatories and Cloud Computing are adopted heavily. In this paper, backgrounds of the project, key features of the system, and latest progresses are introduced.
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