Normalization Coefficient Method Research Articles

ASYMPTOTIC NORMALIZATION COEFFICIENTS FOR 7Be(p, γ)8B FROM RMF CALCULATION

The asymptotic normalization coefficient (ANC) method is used to determine the cross sections of peripheral reactions at astrophysical energies because of existence of the Coulomb barriers. In this paper, we address an estimation of the ANC of 8 B with its single particle wavefunction obtained within the framework of relativistic mean field (RMF) theory. We test the force parameters used in the RMF theory by comparing the calculated structure properties of A = 7–9 drip-line nuclei with experimental results. Utilizing the corrected bound wavefunction of 8 B , the ANC [Formula: see text] is obtained and that indicates the S17(0) is 18.07 eV b. Additionally, we find that the root-mean-square (rms) radius for the loosely bound proton in 8 B is 3.98 fm. This confirms that 8 B has a proton halo structure.

INVESTIGATIONS ON THE NUCLEAR HALO STRUCTURES

The halo structures in some light nuclei are investigated systemically with the nuclear asymptotic normalization coefficient (ANC) method and the relativistic mean-field (RMF) theory. Some important results about the halo structures in mirror nuclei are obtained, and some qualitative analyses are made to explore the role of Coulomb effects on the formation of proton halo nuclei.

Exotic structure of the third excited state in21Na

The probability of the last proton being out of the binding potential,P and the root-mean-square (rms) radius («r2»1/2= of the third excited state in21Na are calculated by means of asymptotic normalization coefficient (ANC) method with the experimental date existing. The results are P=54.73% and «r2»1/2=5.28 fm respectively. TheP value and the contribution of the asymptotic part to the «r2»1/2 are compared with those of several other low energy states in21Na. It is found that the valence particle in the third excited state has an obvious largerP than those of other states. The density distribution of the valence proton in this state is also compared with the nucleons in the nuclear core20Ne, and a far extended tail can be seen clearly. These results show that the third excited state in21Na is a proton halo state.