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arXiv 1312.7175nucl-th
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从破裂观测量提取单中子晕核的电偶极破裂截面

Extracting electric dipole breakup cross section of one-neutron halo nuclei from breakup observables

Kazuki Yoshida, Tokuro Fukui, Kosho Minomo, Kazuyuki Ogata

备注：
12 pages, 4 figures, 7 tables, published on PTEP
发表信息：
Prog. Theor. Exp. Phys. 2014, 053D03
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摘要：

本文讨论了如何从12 C靶和208 Pb靶测量的单中子去除截面中提取电偶极（E1）破裂截面σ（E1）的方法。结果表明，在5%的误差范围内，σ（E1）可由σ_（-1n）^Pb减去Γσ_（-1n）^C得到。然而，对于弱约束弹的反作用，标度因子Γ是通常采用的标度因子的两倍。结果表明，在250 MeV/核子下，~（31）Ne的σ（E_1）比以前的实验数据小13-20%。将几种射弹的Γ值汇总，得到Γ=（2.30 +/- 0.41）\exp（-Sn）+（2.43 +/- 0.21），其中Sn为中子分离能。研究了单中子去除截面和弹性破碎截面的核部分与靶质量数的关系。

英文摘要：

How to extract an electric dipole (E1) breakup cross section σ(E1) from one- neutron removal cross sections measured by using 12C and 208Pb targets, σ_(-1n)^C and σ_(-1n)^Pb, respectively, is discussed. It is shown that within about 5% error, σ(E1) can be obtained by subtracting Γσ_(-1n)^C from σ_(- 1n)^Pb, as assumed in preceding studies. However, for the reaction of weakly-bound projectiles, the scaling factor Γis found to be two times as large as that usually adopted. As a result, we obtain 13-20% smaller σ(E1) of 31Ne at 250 MeV/nucleon than extracted in a previous analysis of experimental data. By compiling the values of Γobtained for several projectiles, Γ=(2.30 +/- 0.41)\exp(- S_n)+(2.43 +/- 0.21) is obtained, where S_n is the neutron separation energy. The target mass number dependence of the nuclear parts of the one-neutron removal cross section and the elastic breakup cross section is also investigated.

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