6Li（0+;T=1）晕态的γ延迟氘发射
Gamma-delayed deuteron emission of the 6Li (0+;T=1) halo state
摘要：
在三体模型中研究了3.563 MeV的M1从$^6$ Li（$0^+;T=1$）态到$^6$ Li（$1^+$）基态和到$α+d$连续体的跃迁.在超球坐标系下，利用拉格朗日网格将束缚态描述为一个$α+n+p$系统.得到了$^6$ Li（0 $^+$）共振的基态磁矩和γ宽度。$^6$ Li $(0^+)$共振的类晕结构被证实，并通过$α+d$连续谱的M1跃迁几率进行探测。光谱对$α+d$相移的描述敏感。相应的伽马宽度约为1.0 meV，具有最佳电位。通过与$^6$ He的$β$延迟氘谱的比较，分析了电荷对称性.在$^6$ He中，发现了短程贡献和晕贡献之间几乎完美的抵消效应。对$^6$ Li（$0^+;T=1$）$γ$衰变进行了类似的分析;它表明，由于不同的结合能和不同的电荷，在大距离处的电荷对称性破缺减少了这种效应。目前的分支比$Γ_γ(0^+\to α+d)/Γ_γ(0^+\to1^+)\approx 1.3\times 10^{-4}$应该可以用现有的实验设备观察到。
英文摘要：
M1 transitions from the $^6$Li($0^+;T=1$) state at 3.563 MeV to the $^6$Li($1^+$) ground state and to the $α+d$ continuum are studied in a three-body model. The bound states are described as an $α+n+p$ system in hyperspherical coordinates on a Lagrange mesh. The ground-state magnetic moment and the gamma width of the $^6$Li(0$^+$) resonance are well reproduced. The halo-like structure of the $^6$Li$(0^+)$ resonance is confirmed and is probed by the M1 transition probability to the $α+d$ continuum. The spectrum is sensitive to the description of the $α+d$ phase shifts. The corresponding gamma width is around 1.0 meV, with optimal potentials. Charge symmetry is analyzed through a comparison with the $β$-delayed deuteron spectrum of $^6$He. In $^6$He, a nearly perfect cancellation effect between short-range and halo contributions was found. A similar analysis for the $^6$Li($0^+;T=1$) $γ$ decay is performed; it shows that charge-symmetry breaking at large distances, due to the different binding energies and to different charges, reduces this effect. The present branching ratio $Γ_γ(0^+\to α+d)/Γ_γ(0^+\to1^+)\approx 1.3\times 10^{-4}$ should be observable with current experimental facilities.
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