Electroexcitation of 208Pb, distribution of electric dipole and quadrupole strength and fragmentation of the isoscalar quadrupole giant resonance
Electroexcitation of 208Pb, distribution of electric dipole and quadrupole strength and fragmentation of the isoscalar quadrupole giant resonance
复制标题
208Pb的电激发、电偶极子和四极子强度分布以及等标量四极巨共振的破碎
DOI：
10.1016/0370-2693(81)90588-8
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发表时间：
1981
影响因子：
4.4
通讯作者：
W. Knüpfer
中科院分区：
文献类型：
--
作者：
G. Kühler;D. Meuer;S. Müller;A. Richter;E. Spamer;O. Titze;W. Knüpfer
用低动量转移、高分辨非弹性电子散射研究了激发能Ex=8−12 MeV范围内E_1和E_2强度的分布。E_1和E_2强度非常零散，在所研究的能区，E_1和E_2强度分别达到(10+7−6)%和(29+11−8)%。所得的E_2强度比目前的大多数理论预测要小，但与本文提出的1p-1h+2p-2h模型的计算结果定性地吻合。E_2的强度也比已知的强子散射强度小，电子和强子散射的强度分布形状也有明显的不同。
Low momentum transfer, high-resolution inelastic electron scattering on208Pb has been used to study the distribution of E1 and E2 strength in the region of excitation energy Ex= 8−12MeV. The E1 and E2 strength is very fragmented and the EWSR strength amounts to (10+7−6)% and (29+11−8)% in the investigated energy region, respectively. The E2 strength found is less than most current theoretical predictions but agrees qualitatively with a 1p - 1h +2p - 2h model calculation presented in this paper. The E2 strength is also smaller than what is known from hadron scattering and the shape of the strength distribution is also markedly different in electron and hadron scattering.