探测原子核基态中预先形成的α粒子
Probing pre-formed alpha particles in the ground state of nuclei
摘要：
在这封信中，我们报告的α粒子发射通过核分裂反应40Ca在40Ca靶在50 A MeV。据观察，与核子类似，α粒子在反应过程中可以以非常特定的角分布发射到连续谱中。α粒子的性质可以理解为子核中的α团簇受到碰撞伙伴的短程核吸引力的扰动而发射。描述α粒子波函数演化的含时理论能够定性地再现所观察到的角分布。这一机制为研究α粒子在核介质中的性质提供了新的可能性。
英文摘要：
In this Letter, we report on alpha particle emission through the nuclear break-up in the reaction 40Ca on a 40Ca target at 50A MeV. It is observed that, similarly to nucleons, alpha particles can be emitted to the continuum with very specific angular distribution during the reaction. The alpha particle properties can be understood as resulting from an alpha cluster in the daughter nucleus that is perturbed by the short range nuclear attraction of the collision partner and emitted. A time-dependent theory that describe the alpha particle wave-function evolution is able to reproduce qualitatively the observed angular distribution. This mechanism offers new possibilities to study alpha particle properties in the nuclear medium.
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