Study of molecular structure of nuclei in the ^<44>Ti region

α-团簇模型在^ Ne附近的sd壳层区域是非常成功<20>的。然而，该模型遇到了很大的困难，在^<44>Ti的fp壳层区域。关键是K=0^-带不可避免地出现在阈值附近，这与实验数据相矛盾。因此，我们认为α-团簇模型可能由于强的自旋-轨道力而不能统一地描述该区域的核结构，通过统一地研究束缚态和散射态，我们可以很好地再现α + ^<40>Ca系统在较宽的能区。我们预言K= 0^-带应该被认为是存在的，并在实验中寻找。1989年在大坂观测到了这一现象，并确定α星团图像在^ Ti中仍然存在<44>，包括基带。我们还证明了α-团簇模型在^ Ca核中成立<40>。通过对fp壳层区束缚态和散射态的统一研究，我们发现在fp壳层区α团簇图像仍然成立，需要从理论和实验两方面进行系统的研究。

Alpha-cluster model has been very successful in the sd-shell region around ^<20>Ne. However the model has met a great difficulty in ^<44>Ti in the fp-shell region. The point is that the K=0^- band inevitably appears near the threshold in contradiction with the experimental data. Therefore, it has been considered that the alpha-cluster model may be no more valid in describing the nuclear structure in a unified way in this region possibly because of strong spin-orbit force.By studying the bound and scattering states in a unified way, we could reproduce the alpha+ ^<40>Ca system very well in a wide energy region. And we have predicted that the K= 0^- band should be considered to exist and be searched for in experiment. This has been observed in 1989 at Osaka and it has been established that the alpha-cluster picture still holds in ^<44>Ti including the ground band. We have also shown that the alpha-cluster model holds in the ^<40>Ca nucleus. The K=0^- band was also predicted near tie threshold , which is now being searched for in experiment.Through the unified study of bound and scattering states in the fp-shell region, we have shown that the alpha-cluster picture still holds in the fp-shell region and should be investigated systematically both theoretically and experimentally.