Ab initio calculations of nuclei face the challenge of simultaneously describing the strong short-range internucleon correlations and the long-range properties of weakly bound halo nucleons. Natural orbitals, which di...Ab initio calculations of nuclei face the challenge of simultaneously describing the strong short-range internucleon correlations and the long-range properties of weakly bound halo nucleons. Natural orbitals, which diagonalize the one-body density matrix, provide a basis which is better matched to the physical structure of the many-body wave function. We demonstrate that the use of natural orbitals significantly improves convergence for ab initio no-core configuration interaction calculations of the neutron halo nucleus ~6He, relative to the traditional oscillator basis.展开更多
Aiming at the production of <sup>6</sup>He,<sup>8</sup>Li and <sup>7</sup>Be radioactive beams,various nuclear dataof d+<sup>6,7</sup>Li and d+<sup>9</sup>Be...Aiming at the production of <sup>6</sup>He,<sup>8</sup>Li and <sup>7</sup>Be radioactive beams,various nuclear dataof d+<sup>6,7</sup>Li and d+<sup>9</sup>Be reactions at incident energies spanning 0,1～30.0 MeV are obtained bycalculation with the distorted wave Born approximation,preequilibrium nuclear reaction andHauser-Feshbach（HF）theory.The cross sections of d+<sup>7</sup>Be reaction are also predicted.Theresults show that the experimental measurement for d+<sup>7</sup>Be reaction is feasible at HI-13 tandemaccelerator.展开更多
The angular distribution of the 12C(7Li,6He)13N reaction at E(7Li) = 44.0 MeV was measured at the HI-13 tandem accelerator of Beijing, China. The asymptotic normalization coefficient (ANC) of 13N → 12C + p was derive...The angular distribution of the 12C(7Li,6He)13N reaction at E(7Li) = 44.0 MeV was measured at the HI-13 tandem accelerator of Beijing, China. The asymptotic normalization coefficient (ANC) of 13N → 12C + p was derived to be (1.64 ± 0.11) fm-1/2 through the distorted wave Born approximation (DWBA) analysis. The ANC was then used to deduce the astrophysical S (E) factors and reaction rates for the 12C(p,γ)13N direct capture reaction at energies of astrophysical relevance.展开更多
基金supported by the US Department of Energy,Office of Science,under Award Numbers DE-FG02-95ER-40934,DESC0008485(Sci DAC/NUCLEI)and DE-FG02-87ER40371
文摘Ab initio calculations of nuclei face the challenge of simultaneously describing the strong short-range internucleon correlations and the long-range properties of weakly bound halo nucleons. Natural orbitals, which diagonalize the one-body density matrix, provide a basis which is better matched to the physical structure of the many-body wave function. We demonstrate that the use of natural orbitals significantly improves convergence for ab initio no-core configuration interaction calculations of the neutron halo nucleus ~6He, relative to the traditional oscillator basis.
基金The project supported by the Nuclear Industry Science Foundation of China
文摘Aiming at the production of <sup>6</sup>He,<sup>8</sup>Li and <sup>7</sup>Be radioactive beams,various nuclear dataof d+<sup>6,7</sup>Li and d+<sup>9</sup>Be reactions at incident energies spanning 0,1～30.0 MeV are obtained bycalculation with the distorted wave Born approximation,preequilibrium nuclear reaction andHauser-Feshbach（HF）theory.The cross sections of d+<sup>7</sup>Be reaction are also predicted.Theresults show that the experimental measurement for d+<sup>7</sup>Be reaction is feasible at HI-13 tandemaccelerator.
基金supported by the National Basic Research Program of China(Grant No. 2007CB815003)the National Natural Science Foundation of China (Grant Nos. 10675173, 10605039, 10705053, 10735100,10720101076, 10875175 and 10975193)
文摘The angular distribution of the 12C(7Li,6He)13N reaction at E(7Li) = 44.0 MeV was measured at the HI-13 tandem accelerator of Beijing, China. The asymptotic normalization coefficient (ANC) of 13N → 12C + p was derived to be (1.64 ± 0.11) fm-1/2 through the distorted wave Born approximation (DWBA) analysis. The ANC was then used to deduce the astrophysical S (E) factors and reaction rates for the 12C(p,γ)13N direct capture reaction at energies of astrophysical relevance.
