supported by the National Natural Science Foundation of China(Nos.11535004,11375086,11120101005,11175085 and11235001);the 973 National Major State Basic Research and Development of China(No.2013CB834400);the Science and Technology Development Fund of Macao(No.068/2011/A)
The a-preformation factors of medium and heavy-mass nuclei are calculated by using the cluster-formation model.The obtained preformation factors of even–even,odd-A,and odd–odd nuclei consist in both magnitude and tr...