Constraints on the dipole photon strength for the odd uranium isotopes
Constraints on the dipole photon strength for the odd uranium isotopes
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奇数铀同位素偶极子光子强度的约束
DOI：
10.1103/physrevc.105.024618
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发表时间：
2022
影响因子：
3.1
通讯作者：
Moreno-Soto J
中科院分区：
文献类型：
--
作者：
Moreno-Soto J
背景：光子强度函数（PSF）和核能级密度（NLD）是计算光子与原子核相互作用，特别是反应截面的关键因素。这些截面是重要的，特别是在核天体物理学和先进的核technology.Purpose的发展：剪刀模式的作用在thePSF（良好变形）锕系元素的几种实验技术进行了研究。不同实验的分析结果存在显著差异，尤其是在模态强度上。巨电偶极共振的低能尾的形状也不确定。特别是，一些作品提出了一个存在的thepygmy共振略高于7兆电子伏。方法：用欧洲核子研究中心的n_TOF装置的总吸收量热计测量了中子俘获反应在~、~、~核上的射线谱。几个孤立波共振高达约140 eV的背景校正和能量和多步级联光谱提取。结果：实验光谱进行了比较，统计模型预测来自一个大的选择模型的光子强度函数和核能级密度。没有任何文献中的PSF和NLD模型的组合能够全局地描述我们的光谱。经过广泛的搜索，我们能够找到模型的组合与修改后的广义洛伦兹（MGLO）PSF，这符合实验光谱以及总的辐射widths.Conclusions：恒定温度的能量依赖是有利于NLD。巨电偶极共振的尾部可以用PSF的MGLO模型很好地描述，而没有任何侏儒共振的迹象。PSF必须包含一个非常强的，相对较宽的，可能是双共振剪刀模式。该模式是负责约一半的总辐射宽度的中子共振，并显着影响的辐射截面。
Background:The photon strength functions (PSFs) and nuclear level density (NLD) are key ingredients for calculation of the photon interaction with nuclei, in particular the reaction cross sections. These cross sections are important especially in nuclear astrophysics and in the development of advanced nuclear technologies.Purpose:The role of the scissors mode in thePSF of (well-deformed) actinides was investigated by several experimental techniques. The analyses of different experiments result in significant differences, especially on the strength of the mode. The shape of the low-energy tail of the giant electric dipole resonance is uncertain as well. In particular, some works proposed a presence of thepygmy resonance just above 7 MeV. Because of these inconsistencies additional information on PSFs in this region is of great interest.Methods:The-ray spectra from neutron-capture reactions on the,, andnuclei have been measured with the total absorption calorimeter of the n_TOF facility at CERN. The background-corrected sum-energy and multi-step-cascade spectra were extracted for several isolated-wave resonances up to about 140 eV.Results:The experimental spectra were compared to statistical model predictions coming from a large selection of models of photon strength functions and nuclear level density. No combination of PSF and NLD models from literature is able to globally describe our spectra. After extensive search we were able to find model combinations with modified generalized Lorentzian (MGLO)PSF, which match the experimental spectra as well as the total radiative widths.Conclusions:The constant temperature energy dependence is favored for a NLD. The tail of giant electric dipole resonance is well described by the MGLO model of thePSF with no hint of pygmy resonance. ThePSF must contain a very strong, relatively wide, and likely double-resonance scissors mode. The mode is responsible for about a half of the total radiative width of neutron resonances and significantly affects the radiative cross section.
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n TOF 合作
DOI：
--
发表时间：
2011
期刊：
影响因子：
--
作者：
F. Belloni;M. Calviani;N. Colonna;P. Mastinu;P. Milazzo;U. Abbondanno;F. Álvarez;S. Andriamonje;J. Andrzejewski;L. Audouin;G. Badurek;P. Baumann;E. Berthoumieux;D. Cano;R. Capote;P. Cennini;V. Chepel;E. Chiaveri;G. Cortés;A. Couture;M. Dahlfors;I. Dillmann;C. Domingo;W. Dridi;C. Eleftheriadis;M. Embid;A. Ferrari;R. Ferreira;W. Furman;E. González;F. Gramegna;C. Guerrero;B. Haas;R. Haight;A. Herrera;M. Igashira;D. Karadimos;D. Karamanis;M. Kerveno;P. Koehler;E. Kossionides;C. Lamboudis;H. Leeb;J. Marganiec;C. Moreau;M. Mosconi;F. Neves;C. Papachristodoulou;C. Papadopoulos;C. Paradela;N. Patronis;A. Pavlik;P. Pavlopoulos;R. Plag;A. Plompen;J. Quesada;R. Reifarth;M. Rosetti;C. Rubbia;P. Rullhusen;J. Salgado;C. Santos;L. Sarchiapone;I. Savvidis;C. Stéphan;G. Tagliente;R. Terlizzi;G. Vannini;P. Vaz;D. Villamarín;V. Vlachoudis;R. Vlastou;S. Walter;M. Wiescher;K. Wisshak
通讯作者：
K. Wisshak
实验多步级联光谱对偶极子光子强度函数的约束
影响因子：
3.1
作者：
M. Krticka;S. Goriely;S. Hilaire;S. Péru;S. Valenta
通讯作者：
S. Valenta
影响因子：
2.7
作者：
Guerrero, C.;Tsinganis, A.;Zugec, P.
通讯作者：
Zugec, P.
在 n-TOF CERN 设施测量的 236U 中子俘获截面
DOI：
--
发表时间：
2017
期刊：
影响因子：
--
作者：
M. Mastromarco;A. Wallner;T. Katabuchi;C. Lederer;C. Eleftheriadis;H. Leeb;G. Giubrone;C. Weiss;Vlachoudis;R. Losito;F. Käppeler;M. Chin;S. Heinitz;M. Krticka;C. Carrapiço;L. Audouin;A. Mengoni;Alejandro Garcia;S. Altstadt;Khryachkov;T. Heftrich;T. Rauscher;Ketlerov;F. Calviño;R. Vlastou;E. Berthoumieux;M. Cortés;M. Licata;S. Schmidt;F. Becvár;J. Quesada;P. Žugec;E. Jericha;A. Ferrari;I. Durán;D. Karadimos;E. Mendoza;S. Ganesan;A. Tarifeño;M. Barbagallo;L. S. Leong;A. Plompen;P. Sedyshev;D. Jenkins;N. Colonna;C. Domingo;G. Cortés;I. Gonçalves;P. Vaz;E. Griesmayer;M. Diakaki;F. Cerutti;D. Tarrío;C. Lampoudis;M. Sabate;M. Calviani;A. Riego;T. Martinez;J. Billowes;E. Leal;P. Milazzo;A. Tsinganis;P. Gurusamy;G. Vannini;M. B. Gómez;J. Lerendegui;J. Andrzejewski;D. Bosnar;T. Ware;J. Tain;A. Manousos;J. Heyse;F. Gunsing;W. Mondelaers;Y. Kadi;Markus Brugger;A. Saxena;R. Sarmento;R. Reifarth;A. Ventura;M. Kokkoris;D. Schumann;E. González;M. Mirea;C. Rubbia;S. Valenta;M. Vermeulen;J. Perkowski;M. Weigand;E. Chiaveri;A. Hernández;R. Versaci;M. Robles;C. Guerrero;C. Langer;J. Praena;Variale;Furman;N. Dzysiuk;F. Roman;K. Fraval;C. Paradela;J. Ryan;L. Tassan;D. Cano;T. Wright;F. Mingrone;C. Massimi;P. Mastinu;G. Tagliente;A. Goverdovski;P. Koehler;Bécares;J. Kroll;P. Schillebeeckx;J. Marganiec;F. Belloni;A. Pavlik
通讯作者：
A. Pavlik
CERN n_TOF 设施中 238U(n,γ) 横截面的高精度测量
DOI：
--
发表时间：
2014
期刊：
影响因子：
--
作者：
T. Wright
通讯作者：
T. Wright