WEAK ABSORPTION AND RESONANCES IN LIGHT HEAVY-ION REACTIONS INDUCED BYTHE NON-a-TYPE 14C NUCLEUS

Fizika B (Zagreb)

ZORAN BASRAK¹  FLORENT HAAS¹  SUZANA SZILNER¹ 

关键词: heavy ions;    14C radioactive beam;    14C targets;    molecular resonances;    refractive effects;    nuclear rainbow;   

DOI  :  

学科分类：物理（综合）

来源: Fizika B: a journal of experimental and theoretical physics

【 摘 要 】

The observation of resonant structures attributed to nuclear molecular configurationsin a-type systems involving the ¹²C and ¹⁶Onuclei is a clear signature of a weak and surface-transparent absorption in these lightheavy-ion reactions at energies around and up to well above the Coulomb barrier. Such aweak absorption, i.e. nuclear-surface transparency, is also predicted in reactions inducedby the ¹⁴C nucleus owing to the very special structure of low-lying states ofthis non-a-type nucleus. The experimental search for resonantstructures in the ¹⁴C +¹⁴C, ¹⁴C +¹²Cand ¹⁴C +¹⁶O reactions undertaken by the Strasbourg-Zagrebcollaboration is described and discussed in the context of weak-absorption phenomena.Strong and correlated resonances have been observed in the three systems studied andparticularly in those decay channels which are sensitive to the largest partial waves inthe entrance channel. As the incident energy increases, weak and surface-transparentabsorption gives rise to refractive effects, i.e to the nuclear rainbow. Indeed, nuclearrainbows have been observed recently in the same a-type ¹²C +¹²C,¹²C +¹⁶O and ¹⁶O +¹⁶O systems inwhich prominent nuclear molecular resonances have been reported at lower energies. It ispredicted that such refractive effects should also be observed in the ¹⁴C-inducedreactions at energies above ~5MeV per nucleon.

【 授权许可】

Unknown