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A systematic experimental study of pre-compound emission in $$\alpha $$ α -particle induced reactions on odd mass nuclei A = 103–123
The European Physical Journal A ( IF 2.7 ) Pub Date : 2020-10-03 , DOI: 10.1140/epja/s10050-020-00238-1
Manoj Kumar Sharma , Mahesh Kumar , Mohd. Shuaib , Ishfaq Majeed , M. Shariq Asnain , Vijay R. Sharma , Abhishek Yadav , Pushpendra P. Singh , Devendra P. Singh , B. P. Singh , R. Prasad

The compound and pre-compound emission processes have been established as two main competing de-excitation modes of an excited nucleus by-dint-of evaporation and emission of light fast particles in low energy \(\alpha \)-induced reactions, respectively. An existence of the plenty experimental data on above established processes for a wide range of mass nuclei coerces to drive for some systematic trends in such reactions with excitation energy and mass number (A). Present work is an attempt to develop a systematics on the pre-compound emission process by analysing consistent experimental cross-section data of \(\alpha \)-particle induced reactions on odd Z and odd A isotopic target nuclei viz., \(^{103}\)Rh, \(^{107}\)Ag, \(^{109}\)Ag, \(^{113}\)In, \(^{115}\)In, \(^{121}\)Sb, and \(^{123}\)Sb, respectively. The analysis of data indicates sarcastic deviation in the experimental cross-section data with respect to calculations performed by the statistical Monte-Carlo code pace4 beyond the peak region. Such deviation becomes more prominent towards tail portion of excitation functions, which is regarded as a significant contribution of the pre-compound emission process. Observed energy dependent uniformity of such deviation for all studied reactions gives a clue for existing some systematics on concerning process with atomic mass number (A). Present study is an extension of previous work [Eur. Phys. J. A 54, 205 (2018)], but rather in more precise way for nearby isotopic target mass nuclei \(^{107}\)Ag, \(^{109}\)Ag, \(^{113}\)In, \(^{115}\)In, \(^{121}\)Sb, and \(^{123}\)Sb, respectively, where role of the Coulomb barrier V\(_b\) and target deformation is found to be significantly important in the systematic decay of excited nuclei through emission of light fast particles in pre-compound process with mass number (A).



中文翻译:

在奇数质量核上的$$ \ alpha $$α粒子诱发的反应中预化合物发射的系统实验研究A = 103–123

化合物和预化合物的发射过程已被确定为两种主要竞争的去激励模式,分别是在低能(α)诱导的反应中,原子核的蒸发和光坚牢粒子的散发。在上述建立的过程中,存在大量的大量质量核强迫的大量实验数据,以推动这种具有激发能和质量数(A)的反应的系统性趋势。当前的工作是通过分析在奇异Z和奇异A靶标原子核上由\(\ alpha \)粒子引起的反应的一致实验横截面数据,来开发一种用于预化合物发射过程的系统学的尝试,\(^ {103} \) Rh,\(^ {107} \) Ag,\(^ {109} \) Ag,\(^ {113} \) In,\(^ {115} \) In,\(^ {121} \) Sb和\(^ {123} \) Sb。数据分析表明,相对于由峰区域以外的统计蒙特卡罗编码速度4进行的计算,实验横截面数据中存在讽刺性偏差。这种偏离朝向激励函数的尾部变得更加突出,这被认为是预化合物发射过程的重要贡献。对于所有研究的反应,观察到的这种偏差的能量依赖性均一性为现有的一些有关原子质量数的过程的系统提供了线索(A)。目前的研究是先前工作的延伸[Eur。物理 J.甲54,205(2018)],而是在附近的同位素目标质量原子核更精确的方式\(^ {107} \)的Ag,\(^ {109} \)的Ag,\(^ {113} \ ) In,\(^ {115} \) In,\(^ {121} \) Sb和\(^ {123} \) Sb,其中库仑势垒V \(_ b \)和目标的作用发现在预复合过程中,通过质量数(A)的快速固光粒子的发射,形变对于激发核的系统衰变非常重要。

更新日期:2020-10-04
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