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Cross sections and isomer ratios in the Rb(n, $$\gamma $$ γ ) and Sr(n, $$\gamma $$ γ ) reactions
The European Physical Journal A ( IF 2.7 ) Pub Date : 2021-01-11 , DOI: 10.1140/epja/s10050-020-00299-2
K. S. Krane

The neutron radiative capture cross sections have been measured for the stable isotopes of Rb (mass numbers 85, 87) and Sr (mass numbers 84, 86, 88) using the activation technique, by observing the \(\gamma \) rays emitted in the decays of the radionuclides produced in neutron irradiation. Values are reported for both the thermal cross sections and the resonance integrals. Internal consistency of the deduced values has been obtained where possible by measuring several radioisotopes from the same sample as well as by irradiating at several different reactor sites that have different mixtures of thermal and epithermal neutrons. Experimental values of the thermal cross sections are compared with values calculated from the known resonances. Isomer ratios are deduced and compared with values calculated from a phenomenological model. Also reported are spectroscopic studies of Rb and Sr radionuclides leading to improved values for the energy of \(\gamma \) rays emitted in the decays of \(^{{86}}\hbox {Rb}\), \(^{{{85g}}} \hbox {Sr}\), and \(^{\mathrm {89}}\hbox {Sr}\). The half-life of \(^{{{87m}}}\hbox {Sr}\) has been remeasured in order to resolve the conflict between two precise but discrepant values reported in the literature.



中文翻译:

Rb(n,$$ \γ$$γ)和Sr(n,$$ \γ$$γ)反应中的截面和异构体比率

使用激活技术,通过观察\(\ gamma \),测量了Rb(质量数85、87)和Sr(质量数84、86、88)的稳定同位素的中子辐射俘获截面中子辐照产生的放射性核素衰变时发出的射线。报告了热横截面和共振积分的值。可以通过测量来自同一样品的几种放射性同位素以及在具有热中子和超热中子的不同混合物的几个不同的反应堆位置进行辐照来获得推断值的内部一致性。将热横截面的实验值与根据已知共振计算的值进行比较。推导异构体比率,并将其与从现象学模型计算得出的值进行比较。还报道了对Rb和Sr放射性核素的光谱研究,从而提高了\(^ {{86}} \ hbox {Rb} \)衰减时发射的\(\ gamma \)射线能量的值\(^ {{{{85g}}} \ hbox {Sr} \)\(^ {\ mathrm {89}} \ hbox {Sr} \)\(^ {{{{87m}}} \ hbox {Sr} \)的半衰期已经过重新测量,以解决文献中报道的两个精确但不一致的值之间的冲突。

更新日期:2021-01-12
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