Recently, the synthesis of new elements above Z = 118 has been a hot topic in nuclear physics. Meanwhile, the α-decay chain is expected to be the unique tool to identify these heaviest nuclei. We have systematically ...Recently, the synthesis of new elements above Z = 118 has been a hot topic in nuclear physics. Meanwhile, the α-decay chain is expected to be the unique tool to identify these heaviest nuclei. We have systematically calculated the α-decay energies and half-lives on the same footing for superheavy nuclei (SHN) within the cluster model along with a slightly modified Woods-Saxon (W.S.) potential as the nuclear potential. Based on the available experimental data, the key radius parameter (R) in the α-core potential is determined via the systematic trend from the α-decay and isotopic chains. The α-decay energy (Qα) values and half-lives are then obtained simultaneously for those unknown SHN in the range of 117 ≤ Z ≤ 120, during which the decay width is obtained using a new treatment for the asymptotic behavior of the α-core wave function. The theoretical values and experimental data are found to be in excellent agreement for the nuclei ^(293,294)117 and ^(294)118 regardless of the method used to determine the R parameter. Predicting the α-decay chains for new elements Z = 119 and Z = 120 can be useful in ongoing or forthcoming experiments.展开更多
In addition to the Coulomb displacement energy,the residual differences between the binding energies of mirror nuclei(a pair of nuclei with the same mass number plus interchanged proton and neutron numbers)contribute ...In addition to the Coulomb displacement energy,the residual differences between the binding energies of mirror nuclei(a pair of nuclei with the same mass number plus interchanged proton and neutron numbers)contribute to the shell effect via the valence scheme in this study.To this end,one linear combining type of valence nucleon number,namely,αNp+βNn,is chosen to tackle this shell correction,in which Npand Nnare the valence proton and neutron numbers with respect to the nearest shell closure,respectively.The mass differences of mirror nuclei,as the sum of the empirical Coulomb displacement energy and shell effect correction,are then used to obtain the binding energies of proton-rich nuclei through the available data of their mirror partners to explore the proton dripline of the nuclear chart.展开更多
基金Supported by the National Natural Science Foundation of China (12075121),the Natural Science Foundation of Jiangsu Province (BK20190067),and the Fundamental Research Funds for the Central Universities (30922010312)。
文摘Recently, the synthesis of new elements above Z = 118 has been a hot topic in nuclear physics. Meanwhile, the α-decay chain is expected to be the unique tool to identify these heaviest nuclei. We have systematically calculated the α-decay energies and half-lives on the same footing for superheavy nuclei (SHN) within the cluster model along with a slightly modified Woods-Saxon (W.S.) potential as the nuclear potential. Based on the available experimental data, the key radius parameter (R) in the α-core potential is determined via the systematic trend from the α-decay and isotopic chains. The α-decay energy (Qα) values and half-lives are then obtained simultaneously for those unknown SHN in the range of 117 ≤ Z ≤ 120, during which the decay width is obtained using a new treatment for the asymptotic behavior of the α-core wave function. The theoretical values and experimental data are found to be in excellent agreement for the nuclei ^(293,294)117 and ^(294)118 regardless of the method used to determine the R parameter. Predicting the α-decay chains for new elements Z = 119 and Z = 120 can be useful in ongoing or forthcoming experiments.
基金Supported by the National Natural Science Foundation of China(12075121 and 11605089)by the Natural Science Foundation of Jiangsu Province(BK20190067 and BK20150762)。
文摘In addition to the Coulomb displacement energy,the residual differences between the binding energies of mirror nuclei(a pair of nuclei with the same mass number plus interchanged proton and neutron numbers)contribute to the shell effect via the valence scheme in this study.To this end,one linear combining type of valence nucleon number,namely,αNp+βNn,is chosen to tackle this shell correction,in which Npand Nnare the valence proton and neutron numbers with respect to the nearest shell closure,respectively.The mass differences of mirror nuclei,as the sum of the empirical Coulomb displacement energy and shell effect correction,are then used to obtain the binding energies of proton-rich nuclei through the available data of their mirror partners to explore the proton dripline of the nuclear chart.
