Coexistence and fluctuations phenomena with Davidson-like potentials in quadrupoleoctupole deformed nuclei  

作　　者：M M Hammad W H Mansour E M El-Maghraby H A Motaweh Ayman A Aly 

机构地区：[1]Faculty of Science,Mathematics Department,Damanhour University,Egypt [2]Faculty of Science,Physics Department,Damanhour University,Egypt

出　　处：《Communications in Theoretical Physics》2021年第3期105-118,共14页理论物理通讯（英文版）

摘　　要：The energy spectra of three types of two-dimensional potentials(we will call them‘Davidson-like potentials’(DLPs)),characterized by four minima separated by barriers,are investigated.The predictions for spectra and wave functions are obtained by using the nine-point finite-difference method.For these potentials,with the existence of a single configuration,a transition of spectra,as a function of barrier height,is covered from tunneling splitting modes to fluctuations phenomena,with equal peaks wave functions,crossing to the spectra of purely anharmonic oscillator potentials(AOPs).A different type of phase transition occurs when two(or more)configurations coexist.With the change of the parameters,a transition of spectra is covered from coexistence phenomena of two distinct quantum tunneling modes to fluctuations phenomena,with unequal peaks wave functions,crossing to the spectra of purely AOPs.Using DLPs,a particular application of the coherent quadropole-octupole model to describe energy bands with alternating parity of the nuclei^(100)Mo,^(146,148)Nd,^(148,150)Sm,^(220)Ra,^(220,222)Rn,and^(220,222)Th is presented.The global parametrization of the model for the selected nuclei is achieved.

关 键 词：quantum phase transitions fluctuations phenomena coherent quadrupole-octupole motion model coexistence phenomena 

分 类 号：O571[理学—粒子物理与原子核物理]