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107Ag(n,2n)106mAg反应截面测量 总被引:1,自引:0,他引:1
本文报告了En=13.50—14.73MeV中子能区用活化法以27Al(n,2)24Na截面为中子注量标准得的107Ag(n,2n)106mAg的反应截面.在En=13.50,13.60,13.90,14.10,14.35,和14.73MeV处的截面分别为469±22,480±22,503±24,538±25,555±25和572±26mb.在文中还列举了一些国外已发表的截面数据以作比较.中子能量用铌锆活度比法测定. 相似文献
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报道了在13.5—14.6MeV中子能区用活化法测得的160Gd(n,2n)159Gd和158Gd(n,p)158Eu的
反应截面值. 中子注量用93Nb(n, 2n)92m Nb反应截面得到. 由(13.5±0.2)MeV,(14.1±0.1)MeV和(14.6±0.2)MeV中子引起的160Gd(n, 2n) 159Gd反应截面值分别为(1940±83)mb, (2324±92)mb和(1983±77)mb, 158Gd(n, p) 158Eu反应截面值分别为(1.9±0.1)mb, (2.1±0.1)mb和(3.5±0.1)mb. 单能中子由T(d, n)4He反应获得.文中还列举了已收集到的数据以作比较. 相似文献
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本文报告了在En=13.6—14.8MeV中子能区用活化法以27Al(n,α)24Na截面为中子注量标准测得的62Ni(n,α)59Fe的反应截面.在En为 13.64,13.79,14.00,14.05,14.33,14.60和14.80MeV处的截面分别为17.4±1.1,19.5±1.5,21.9±1.9,22.4±1.6,25.4±1.4,26.1±1.1和26.0±1.1mb.在文章中还列举了所能收集到的一些作者的数据以作比较.中子能量是用铌锆截面比法测定的. 相似文献
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本文报告了En=13.6—14.8MeV中子能区用活化法以27Al(n,α)24Na截面为中子注量标准得的60Ni(n,p)60Co的反应截面.在En为 13.64,13.79,14.03,14.33,14.60,14.80MeV处的截面分别为184.4±12.2,178.8±10.5,171.4±10.3,161.9±9.6,157.0±9.3,147.5±8.9mb.在文章中还列举了所能收集的一些作者的数据以作比较.中子能量是用铌锆截面比法则定的. 相似文献
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用屏栅电离室测量了入射中子能量为5.1MeV的58Ni(n,α)55Fe核反应的α粒子角分布,238U裂变电离室作中子注量率的测量,测得该能点58Ni(n,α)55Fe的总截面为(47.4±5.0)mb.用中国核数据中心推荐的理论计算程序UNF计算了在1—8MeV能区58Ni(n,p)58Co,58Ni(n,α)55Fe的反应截面和入射中子能量为5.1MeV的58Ni(n,α)反应角分布.理论和测量数据的比较说明,用复合核模型来描写该能点的角分布是可行的. 相似文献
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用中子活化法相对于54Fe(n,P)54Mn反应,在13.50—14.80MeV中子能区测量了Ba(n,x)134Cs,134Ba(n,2n)133Ba,140Ce(n,2n)139Ce,142Ce(n,2n)141Ce和23Na(n,2n)22Na的反应截面.并将所测的结果和其他作者的结果进行了比较,中子能量是用90Zr(n,2n)89m+gZr反应和93Nb(n,2n)92mNb反应截面比法测定的. 相似文献
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S. André J. Boutet J. Rivier J. Treherne J. Jastrzebski J. Łukasiak Z. Sujkowski C. Sebille-Schück 《Nuclear Physics A》1975,243(2):229-259
Enriched targets of 187Re and 185Re were bombarded with α-particles of energy between 23.0 and 42.8 MeV. The levels characteristic of 189Ir and 187Ir produced by the (α, 2n) reaction were studied. The positive parity bands built on the ground state and on the first excited state in both nuclei were observed and interpreted as bands built on the +[402] and [400] Nilsson states. The negative parity levels form two independent systems: the first one possesses characteristics typical of a rotation-aligned band and is interpreted as belonging to the h orbital; the second one is connected with the isomeric state which originates from the h orbital. The possibility of a triaxial shape for this h. level system is discussed. In 189Ir a 3.2 ms isomeric state of 2333 keV excitation energy has been found and, as a by-product, some information has been gathered on the 4.1 ms isomer in 188Ir. 相似文献
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A.J. Kreiner C. Alonso Arias M. Debray D. Digregorio A. Pacheco J. Davidson M. Davidson 《Nuclear Physics A》1984,425(3):397-410
The deexcitation of states in 188Ir, formed through the 187Re(α, 3n)188Ir reaction, was studied using in-beam and off-beam gamma and electron spectroscopy techniques. A new level scheme, exhibiting a rather high level density, is presented. An interpretation of the structure of these states is attempted using information on one-quasiparticle intrinsic states from neighboring oddproton and odd-neutron nuclei. 相似文献
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Friedrich Grein 《Molecular physics》2020,118(18)
CCSD(T) and MP2 results using the aug-cc-pV5Z basis set are reported for chain, cyclic and other structures of the clusters (H2)n, n?=?2-8, (CO2)n, n?=?2-6 and (HF)n, n?=?2-8. In chain-like structures of (H2)n and (CO2)n, with the bonding type of the dimer maintained, the dissociation energy De of the dimer doubles for the trimer, triples for the tetramer, and so on. Due to these systems being dominated by short-range forces, interactions are essentially restricted to neighbouring monomers. For other types of (H2)n and (CO2)n structures, the multipliers relative to the dimerisation energy can be much higher. Dissociation energies for the hexamers in S6 symmetry of both H2 (379?cm?1) and CO2 (4925?cm?1) are over ten times the respective dimerisation energies. For the chain-like trimer of HF, however, De is in excess of double the dimer value. Mainly due to longer-range dipolar forces, the interactions reach beyond the neighbouring monomers. The interaction energy between HF monomers in chains follows an approximate R?2 (R being the F–F distance) relationship, The calculated dissociation energies of the HF octamer are 15,985?cm?1 (factor of 10.4) for the chain, and 21,003?cm?1 (factor of 13.7) for the C6h cyclic structure. 相似文献
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The cross sections for the reactions 241Am(n, 2n)240Am and 241Am(n, 3n)239Am are measured for several neutron-energy values in the range 13.42–14.86 MeV. An upper limit on the cross section for the reaction 241Am(n, α)238Np is also obtained. 相似文献
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The multi-step compound-emission (MSC) theory has been used to analyse the preequilibrium effects in the neutron-emission spectra and excitation curves of the (n, 2n) reactions. Cross sections for the 191Ir(n, 2n) and 193Ir(n, 2n) reactions are reported in the neutron-energy range from 13 MeV to 18 MeV and analysed in terms of combined compound-nucleus and MSC theory. 相似文献
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在统计理论及考虑角动量守恒的激子模型的基础上,运用Monte Carlo方法计算(n,20)反应同质异能态截面比. 以59Co(n,2n)58Co、93Nb(n,2n)92Nb和181Ta(n,2n)180Ta的3个反应道为例,计算从其阈能到20MeV能区的同质异能态截面比,并和已有实验数据做了比较,结果符合较好. 这表明本文提供的方法是计算(n,2n)反应同质异能态截面比的一种有效方法. 相似文献