Spectroscopy of Pionic Atoms in 122 Sn ( d , 3 He ) Reaction and Angular Dependence of the Formation Cross Sections
Spectroscopy of Pionic Atoms in 122 Sn ( d , 3 He ) Reaction and Angular Dependence of the Formation Cross Sections
复制标题
122 Sn( d , 3 He ) 反应中π原子的光谱和地层横截面的角度依赖性
DOI：
10.1103/physrevlett.120.152505
复制
发表时间：
2018
影响因子：
8.6
通讯作者：
K. Itahashi et al.
中科院分区：
文献类型：
--
作者：
T. Nishi;K. Itahashi et al.
在核反应的丢失质谱中，我们观察到束缚核的原子态和态是不同的峰结构。一个非常强烈的氘核束和一个光谱仪与一个大的角度接受让我们实现了潜在的发现，其中包括确定的角度依赖的横截面与高统计的能力。首次观察到Sn核中的态。的结合能和宽度的介子态的测定和发现是与以前的实验结果的其他锡同位素。首次测量了有限反应角下的光谱。确定了反应角在0° ~ 2°范围内的地层截面。所观察到的反应角的依赖性，每个状态的理论计算再现。然而，与我们的高精度数据的定量比较揭示了一个显着的差异之间的测量和计算的形成截面的pionicstate。
We observed the atomicandstates ofbound tonuclei as distinct peak structures in the missing mass spectra of thenuclear reaction. A very intense deuteron beam and a spectrometer with a large angular acceptance let us achieve a potential of discovery, which includes the capability of determining the angle-dependent cross sections with high statistics. Thestate in a Sn nucleus was observed for the first time. The binding energies and widths of the pionic states are determined and found to be consistent with previous experimental results of other Sn isotopes. The spectrum is measured at finite reaction angles for the first time. The formation cross sections at the reaction angles between 0° and 2° are determined. The observed reaction-angle dependence of each state is reproduced by theoretical calculations. However, the quantitative comparison with our high-precision data reveals a significant discrepancy between the measured and calculated formation cross sections of the pionicstate.