激发态$^{25}$ Mg衰变中精确选择蒸发链的实验研究
Experimental study of precisely selected evaporation chains in the decay of excited $^{25}$Mg
摘要：
利用位于INFN国立科学院的GARFIELD +环计数器装置研究了95 MeV轰击能量下的反应$^{12}$ C + $^{13}$ C。在本文中，我们要调查的$^{25}$ Mg的去激发，旨在核衰变的统计描述的一个新的严格的测试和直接比较系统$^{24}$ Mg通过$^{12}$ C+ $^{12}$ C反应形成的衰变先前研究。由于探测器的广泛接受和它良好的碎片识别能力，我们可以对聚变-蒸发事件进行严格的选择，要求它们的完整性。蒸发残留物和发射的光粒子的主要衰变特征总体上由纯统计模型很好地描述;然而，对于先前研究的24 Mg的情况，我们观察到分支比的一些偏差，特别是对于仅涉及$α$粒子蒸发的那些链。从这个角度来看，$^{24}$ Mg和$^{25}$ Mg衰变情况的行为似乎相当相似。尝试获得一个完整的质量平衡，即使没有中子探测也进行了讨论。
英文摘要：
The reaction $^{12}$C + $^{13}$C at 95 MeV bombarding energy is studied using the GARFIELD + Ring Counter apparatus located at the INFN Laboratori Nazionali di Legnaro. In this paper we want to investigate the de-excitation of $^{25}$Mg aiming both at a new stringent test of the statistical description of nuclear decay and a direct comparison with the decay of the system $^{24}$Mg formed through $^{12}$C+$^{12}$C reactions previously studied. Thanks to the large acceptance of the detector and to its good fragment identification capabilities, we could apply stringent selections on fusion-evaporation events, requiring their completeness in charge. The main decay features of the evaporation residues and of the emitted light particles are overall well described by a pure statistical model; however, as for the case of the previously studied 24Mg, we observed some deviations in the branching ratios, in particular for those chains involving only the evaporation of $α$ particles. From this point of view the behavior of the $^{24}$Mg and $^{25}$Mg decay cases appear to be rather similar. An attempt to obtain a full mass balance even without neutron detection is also discussed.
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