Study of Weak Hyperon Nucleon Interaction by means of Decay Particle Spectroscopy

众所周知，哈龙（Baryons和Mesons）是由强有力的相互作用制成的。“哈龙之间的互动并不是很好地理解我们的无能来描述夸克信任被破坏在一个已知的原则上。”核相互作用很好地描述了米森交换理论，除了在短距离内，哈龙的大小可以在模型中获得帐户。夸克和胶水的自由度必须呈现出梅森变化模型的灵活性，以使其能够锁定并清除自由的存在。SU（3）模型的扩展应该是对许多模型的最佳测试，以描述NN交互良好。在目前的研究中，我们将注意力集中在最初的短程相互作用上。在这项研究中研究的后续主题。（1） Parity violation in the weak nonmesonic decay of hypernuclei.Weak nonmesonic decay NΛ乃至NN has a large momentum transfer that make interaction at short distance vital。我们演示了极化γ hypernuclei和weak nonmesonic decay具有不对称角度分布对奇偶破坏的生成。“奇偶校验破坏的严重程度被发现与米森交换模型不一致。”（2） Spin-orbit interaction ofイイD313（/）イエD3C was measured. Spin-orbit splitting of·hypernuclei is known to be small though no definite value has been given by experiments。We producedイD313（\）イエD3C by the （イD1-イD1，イD1-イD1） using kaon beam provided by the AGS at BNL and measured the splitting by detecting·发现的碎片比核碎片小20-40次。（3）通过较弱的交互来生产strangeness。我们准备了一个实验来衡量较弱的非中间年（pn → pΛ）。这是一个通过弱互动而使生产变得奇怪的过程。这从来没有受到过挑战。我们发现，这个实验是由探测器精心设计的。

It is well known that hadrons (Baryons and mesons) are made up of quarks and gluons by the strong interaction. The interaction among hadrons is not well understood especially due to our inability to describe the quark confinement beased on a known principle. The nucleon nucleon interaction is well described by meson exchange theory except at short distances where size of hadrons has to be taken into account in the model. Quark and gluon degrees of freedom have to be present though flexibility of the meson change model forbits to pin down clearly the existence of the freedom. The SU(3) extention of the model should be the best testing gound for many models that describe well the NN interaction. In the present research we focused our attention to the phenomena which originate short range interaction. Following subjects were studied in this research.(1) Parity violation in the weak nonmesonic decay of hypernuclei.Weak nonmesonic decay NΛ → NN has a large momentum transfer that make interaction at short distance vital. We demonstrated production of polarized Λ hypernuclei and weak nonmesonic decay has asymmetric angular distribution corresponding parity violation. The magnitude of the parity violation is found to be inconsistent with meson exchange model.(2) Spin-orbit interaction of ィイD313(/)ΛィエD3C was measured.Spin-orbit splitting of Λ hypernuclei is known to be small though no definite value has been given by experiments. We produced ィイD313(/)ΛィエD3C by the (KィイD1-ィエD1, πィイD1-ィエD1) using kaon beam provided by the AGS at BNL and measured the splitting by detecting γ rays. The splitting was found to be 20-40 times smaller than that of nucleons.(3) Production of strangeness by weak interaction.We are preparing an experiment to measure the inverse reaction (pn → pΛ) of the weak nonmesonic decay. It is a process to produce strangeness by weak interaction. It has never been challenged. We found that the experiment is feasible by carefully designing the detector.