Effects of the nuclear structure of fission fragments on the high-energy prompt fission γ-ray spectrum in U235(nth,f)
Effects of the nuclear structure of fission fragments on the high-energy prompt fission γ-ray spectrum in U235(nth,f)
复制标题
裂变碎片的核结构对U235(nth,f)高能瞬发裂变γ能谱的影响
DOI：
10.1103/physrevc.100.044610
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发表时间：
2019
影响因子：
3.1
通讯作者：
Kawano T.
中科院分区：
文献类型：
--
作者：
Makii H.;Nishio K.;Hirose K.;Orlandi R.;L?guillon R.;Ogawa T.;Soldner T.;K?ster U.;Pollitt A.;Hambsch F.-J.;Tsekhanovich I.;A?che M.;Czajkowski S.;Mathieu L.;Petrache C. M.;Astier A.;Guo S.;Ohtsuki T.;Sekimoto S.;Takamiya K.;Frost R. J. W.;Kawano T.
在能区测量了冷中子诱发裂变的瞬发裂变射线能谱，与迄今为止的测量结果相比，获得了约1个统计因子。光谱在和处表现出局部的凸点结构，在处也表现出宽的凸点结构.为了理解这些隆起的起源，我们使用统计豪泽-费什巴赫模型计算了这些谱，并考虑了所有可能的初级裂变碎片的去激发。结果表明，这种碰撞是由周围碎片中的分立能级之间的跃迁产生的，而这种碰撞主要来自于互补光碎片。它还表明，有限数量的核素，在低激发能量下具有高自旋态，可以有助于周围的凸块结构，诱导的过渡喂养到低位的高自旋态。
The prompt fission-ray energy spectrum for cold-neutron-induced fission ofwas measured in the energy range, by gaining a factor of aboutin statistics compared to the measurements performed so far. The spectrum exhibits local bump structures atand, and also a broad one at. In order to understand the origins of these bumps, thespectra were calculated using a statistical Hauser-Feshbach model, taking into account the deexcitation of all the possible primary fission fragments. It is shown that the bump atis created by the transitions between the discrete levels in the fragments around, and the bump atmostly comes from the complementary light fragments. It is also indicated that a limited number of nuclides, which have high-spin states at low excitation energies, can contribute to the bump structure around, induced by the transition feeding into the low-lying high-spin states.