Influence Of Nuclear Deformation On Alpha Decay Half-Life

Alpha decay is the spontaneous emission of radiation from the nucleus into an-other element.Alpha decay is the main decay method of neutron-deficient heavy and superheavy nuclei,and it is also an important and effective method to identify unknown nuclides and new nuclides.Study of alpha decay can get a lot of nucleus structure infor-mation,such as shell structure,nuclear decay energy spectrum,ground state half-life,spin parity,energy level and atomic nuclei deformation,alpha decay also has important application in astrophysics,can through the research of alpha rays to the exploration of the universe in the universe structure information,therefore,the study of alpha decay is the current nuclear physics,one of the leading edge of the hot issues in the alpha decay half-life of theoretical calculation,in addition to the choice of the barrier is critical,the alpha particle of form factor is also a very sensitive parameters,how to turn the mi-croscopic effect of atomic nuclei,such as shell effect,the introduction of deformation effects into the preformation factors is very important to improve the predictive power of the model.Based on the cosh barrier penetration method,this paper studies the effect of nuclear deformation on the half-life of alpha decay.The main work is as follows:1.We analyze and sort out the experimental data of alpha decay half-life in the latest nuclear property evaluation table NUBASE2016,put forward the alpha preform-ing factor with deformation effect,and the research shows that the deformation energy of the nucleus has a parabolic relation with alpha preforming factor.2.We calculate the alpha decay half-life of 198 nuclides with A>140,Z<100,alpha decay mode greater than 90%using the deformation energy-related alpha preforming factor,and the calculated results are compared with the traditional alpha decay half-life calculated by the alpha preformation factor considering the shell effect and the experimental data.It was found that the decay half-life of the preformative factor associated with the deformation energy was better calculated,with an accuracy improvement of 12%.3.We calculate the alpha decay half-life of the heavy nucleus(101 nuclides with Z>92)using the new alpha preformation factor.The result of the calculation was found to be similar to that of the 18 empirical formulas.This indicates that the alpha preformation factor related to deformation energy has certain reliability for accurately predicting the half-life of alpha decay.