Isoscalar giant dipole resonance in Zr-90, Sn-116, and Pb-208
Isoscalar giant dipole resonance in Zr-90, Sn-116, and Pb-208
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Zr-90、Sn-116 和 Pb-208 中的等标量巨偶极子共振
DOI：
10.1103/physrevc.63.031301
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发表时间：
2001
影响因子：
3.1
通讯作者：
D. Youngblood
中科院分区：
文献类型：
--
作者：
H. Clark;Y. Lui;D. Youngblood
90 Zr、116 Sn 和 208 Pb 等标量偶极子激发的强度函数已通过 240 MeV α 粒子在小角度的非弹性散射进行了测量。发现每个核中的等标量 E 1 强度分布由 E x∼ 1 1 4/A 1/3 MeV 处的宽分量组成，包含大约 100% 的 EWSR 和 E x∼ 7 2/A 1/3 MeV 处的较窄分量，包含总等标量 E 1 强度的 15-28%。较高的分量是先前仅在 208 Pb 中报告的压缩模式 E 1 强度，而较低的分量可能是先前未报告的新模式，但由最近的 RPA-HF 和相对论平均场计算表明。
Strength functions for isoscalar dipole excitations in 90 Zr, 116 Sn, and 208 Pb have been measured with inelastic scattering of 240 MeV α particles at small angles. The isoscalar E 1 strength distribution in each nucleus is found to consist of a broad component at E x∼ 1 1 4/A 1/3 MeV containing approximately 100% of the E 1 EWSR and a narrower one at E x∼ 7 2/A 1/3 MeV containing 15–28% of the total isoscalar E 1 strength. The higher component is the compression mode E 1 strength previously reported only in 208 Pb, whereas the lower component may be a new mode not reported previously, but suggested by recent RPA-HF and relativistic mean field calculations.