Spin-flip isovector giant resonances from the 90Zr(n,p)90Y reaction at 198 MeV.
Spin-flip isovector giant resonances from the 90Zr(n,p)90Y reaction at 198 MeV.
复制标题
198 MeV 90Zr(n,p)90Y 反应的自旋翻转等向量巨共振。
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
Yavin
中科院分区：
文献类型：
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作者：
Raywood;Spicer;Yen;Long;Moinester;Abegg;Alford;Celler;Drake;Frekers;Green;Häusser;Helmer;Edward S. Henderson;Hicks;Jackson;Jeppesen;King;Miller;Officer;Schubank;Shute;Vetterli;Watson;Yavin
在198 MeV激发到38 MeV的剩余核上，测量了反应{sup_(90)_r({ital_n}，{ital_p}){sup_(90)Y的双微分截面。获得了1.3 MeV的总分辨率。光谱的形状和大小与最近的随机相位近似计算显示出定性的一致；然而，所有的计算都低估了光谱的高激发区域。利用在扭曲波脉冲近似下计算的微分截面，对数据进行了多极分解。给出了反应中Gamow-Teller强度的估计值。已经发现了向量自旋-翻转偶极子的巨型共振，也有向量单极强度的迹象。
Doubly differential cross sections of the reaction {sup 90}Zr({ital n},{ital p}){sup 90}Y have been measured at 198 MeV for excitations up to 38 MeV in the residual nucleus. An overall resolution of 1.3 MeV was achieved. The spectra show qualitative agreement in shape and magnitude with recent random phase approximation calculations; however, all of the calculations underestimate the high excitation region of the spectra. A multipole decomposition of the data has been performed using differential cross sections calculated in the distorted-wave impulse approximation. An estimate of the Gamow-Teller strength in the reaction is given. The isovector spin-flip dipole giant resonance has been identified and there is also an indication of isovector monopole strength.