标题： 高能剪刀模式 显示英文标题

标题： High-energy scissors mode

摘要： 所有从旋转不变的QRPA得到的轨道M1激发，无论在低能还是高能区域，都代表了碎片化的剪切模态。 高能M1强度几乎完全是轨道的，并位于同位旋矢量巨四极矩共振区域。 在重的形变核中，高能剪切模态在17到25 MeV之间强烈碎片化（不确定性来自于对同位旋矢量势了解不足）。 相干剪切运动由于碎片化而受阻，$B(M1) < 0.25 \; \mu^2_N$在此区域的单个跃迁中。 对于17 MeV以上的激发，$(e,e^{\prime})$跨度在E2激发上比M1激发大一个数量级，即使在后向角度也是如此。 显示英文摘要

摘要： All the orbital M1 excitations, at both low and high energies, obtained from a rotationally invariant QRPA, represent the fragmented scissors mode. The high-energy M1 strength is almost purely orbital and resides in the region of the isovector giant quadrupole resonance. In heavy deformed nuclei the high-energy scissors mode is strongly fragmented between 17 and 25 MeV (with uncertainties arising from the poor knowledge of the isovector potential). The coherent scissors motion is hindered by the fragmentation and $B(M1) < 0.25 \; \mu^2_N$ for single transitions in this region. The $(e,e^{\prime})$ cross sections for excitations above 17 MeV are one order of magnitude larger for E2 than for M1 excitations even at backward angles.