Study of hidden nuclear interactions(Neutron rich nuclei and the tensor forces)

在RCNP，我们研究了E_p=200~400 MeV的^&lt；16&gt；O(p，d)^&lt；15&gt；O反应。测量了^&lt；15&gt；O到离散激发态的跃迁截面。在高能正宇称态的跃迁中，观察到了截面的反常增强。这种反常现象被定量地理解为张量力产生的高动量核子的影响，从而暗示了原子核中张量力的直接证据。在GSI，质子弹性散射测量已经被用来研究丰中子镍同位素的密度分布。我们本可以将测量范围扩大到^&lt；70；Ni。数据正在分析中。我们将首次获得中等质量丰中子核的密度分布。

At RCNP, we study^<16> O(p, d)^<15> O reaction at E_p=200~ 400 MeV. The cross section of transitions to the discrete excited states in^<15> O have been measured. The abnormal enhancement of the cross section has been observed in the transition to the positive parity states at high energy. This anomaly is understood quantitatively as an effect of high-momentum nucleon produced by the tensor force and thus suggests a direct evidence of the tensor force in a nucleus.At GSI, measurements of proton elastic scattering have been made to study the density distribution of neutron rich Ni isotopes. We could have extended the measurement up to^<70> Ni. The data are under analysis. We will obtain density distribution of medium mass neutron-rich nuclei for the first time.