U.S.-France Cooperative Research: Nuclear Spin Excitations

该提案要求罗格斯大学的首席研究员Charles Glashausser博士和两位同事与巴黎第十一大学核物理研究所的Louis Bimbot博士及其研究小组合作，在萨克雷的国家实验室（laboratory National Saturne）开展原子核自旋激发的研究。这两个小组将在两个实验室的中能粒子加速器上合作进行新的实验。通过测量从碳-12和钙-48等目标散射出来的粒子的自旋所产生的可观测值，实验人员将确定核连续状态的光谱，这种状态只能通过自旋向原子核的转移来激发。这两个小组先前的独立工作表明，这些新的实验可能解决长期存在的缺失磁偶极子强度的问题，并确定以前未探索的核谱的特征。美国和法国的研究小组在核物理的这一领域都取得了长期的重大成就。他们的相互参与很可能带来重要的新成果，这是任何一方单独工作都无法实现的。对于美国团队来说，这意味着有机会利用美国没有的偏振氘核光束开创一个新的子领域。对于法国团队来说，这意味着现在有机会为法国有效启动的研究领域做出重要贡献。

This proposal requests support for the principal investigator Dr. Charles Glashausser and two colleagues at Rutgers University to carry out research on spin excitations in atomic nuclei at the Laboratoire National Saturne in Saclay, in collaboration with Dr. Louis Bimbot of the Institute for Nuclear Physics, University of Paris XI and his research group. The two groups will collaborate on new experiments at intermediate energy particle accelerators at the two laboratories. By measuring observables which depend upon the spin of the outgoing particles scattered from targets such as carbon-12 and calcium-48 the experimenters will determine the spectrum of nuclear continuum states which can be excited only by a transfer of spin to the nucleus. Previous independent work by both groups suggests that these new experiments may resolve the long-standing problem of missing magnetic dipole strength as well as determine features of the nuclear spectrum in previously unexplored regimes. Both the U.S. and French groups have a long record of significant accomplishment in this area of nuclear physics. Their mutual involvement is very likely to lead to important new results which neither could accomplish working alone. For the U.S. group, it means the opportunity to initiate a new subfield by making use of the polarized deuteron beam unavailable in the U.S. For the French, it means an opportunity to make an important contribution now to a line of research effectively initiated in France.