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arXiv 0809.3685nucl-th
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靶取向角和轨道angular momentum在蒸发残渣生产中的作用

Role of the target orientation angle and orbital angular momentum in the evaporation residue production

Giovanni Fazio, Giorgio Giardina, Francis Hanappe, Giuseppe Mandaglio, Marina Manganaro, Akhtam I. Muminov, Avazbek K. Nasirov, Carmelo Sacca

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20 pages, 10 figures, submitted to JPSJ
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摘要：

本文研究了靶核对称轴相对于束流方向的取向角对$^{48}$ Ca+ $^{154}$ Sm反应蒸发残渣产生的影响。在低能量（$E_{\rm c.m.}<$ 137 MeV），蒸发残留物的产量，观察到只有小的取向角（$α_T<45^0$）的碰撞。在大能量（约$E_{\rm c.m.}=$ 140- 180 MeV）下，所有取向角$α_T$可在10- 100 mb范围内对蒸发残余物横截面$σ_{ER}$作出贡献，而在$E_{c.m.}>$ 180 MeV下，$σ_{ER}$的范围约为0.1- 10 mb，因为复合核的裂变势垒因其激发能和角动量的增加而降低。

英文摘要：

The influence of the orientation angles of the target nucleus symmetry axis relative to the beam direction on the production of the evaporation residues is investigated for the $^{48}$Ca+$^{154}$Sm reaction as a function of the beam energy. At low energies ($E_{\rm c.m.}<$137 MeV), the yield of evaporation residues is observed only for collisions with small orientation angles ($α_T<45^0$). At large energies (about $E_{\rm c.m.}=$140--180 MeV) all the orientation angles $α_T$ can contribute to the evaporation residue cross section $σ_{ER}$ in the 10--100 mb range, and at $E_{c.m.}>$180 MeV $σ_{ER}$ ranges around 0.1--10 mb because the fission barrier for a compound nucleus decreases by increasing its excitation energy and angular momentum.

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