The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
T.k. Umesh - One of the best experts on this subject based on the ideXlab platform.
-
role of 208pb Daughter Nucleus and nuclear shell effects in trans lead cluster radioactivity by emission of neon clusters from 218 236u isotopes
Annalen der Physik, 2012Co-Authors: G.s. Swamy, T.k. UmeshAbstract:In the present work, the cluster radioactivity of even A uranium isotopes (218–236U) with the emission of both alpha-like and non-alpha-like neon clusters (20,22,24,26,28Ne) was studied. The decimal logarithm of half-lives (expressed in seconds) were calculated by three different approaches based on (i) the single line of Universal curve (UNIV) for alpha and cluster radioactive decay, (ii) the Universal Decay law (UDL) and (iii) by considering a fission-like model in which the interacting nuclear potential barrier was taken to be the sum of Coulomb and proximity potentials (CPPM) respectively. Based on the half-lives calculated by using the three different approaches mentioned above, significance of the role of 208Pb Nucleus (doubly magic Nucleus) and nuclear shell effects in trans-lead cluster radioactivity were investigated. The calculated half-lives have also been compared with available experimental results. It was observed that cluster decay modes leading to the formation of 208Pb Daughter Nucleus have the lowest half-lives. This implies that there is a shell closure at proton number (Z) = 82 and neutron number (N) = 126. Hence, it confirms the existence of nuclear shell effect and stresses the significance of role of 208Pb Daughter Nucleus in the trans-lead cluster radioactivity. It can be noticed that the calculated half-lives for several cluster decay modes are well within the present experimental upper limit for measurements (T1/2 < 1030S). These results may be useful for future experiments.
-
Role of 208Pb Daughter Nucleus and nuclear shell effects in trans‐lead cluster radioactivity by emission of neon clusters from 218–236U isotopes
Annalen der Physik, 2012Co-Authors: G.s. Swamy, T.k. UmeshAbstract:In the present work, the cluster radioactivity of even A uranium isotopes (218–236U) with the emission of both alpha-like and non-alpha-like neon clusters (20,22,24,26,28Ne) was studied. The decimal logarithm of half-lives (expressed in seconds) were calculated by three different approaches based on (i) the single line of Universal curve (UNIV) for alpha and cluster radioactive decay, (ii) the Universal Decay law (UDL) and (iii) by considering a fission-like model in which the interacting nuclear potential barrier was taken to be the sum of Coulomb and proximity potentials (CPPM) respectively. Based on the half-lives calculated by using the three different approaches mentioned above, significance of the role of 208Pb Nucleus (doubly magic Nucleus) and nuclear shell effects in trans-lead cluster radioactivity were investigated. The calculated half-lives have also been compared with available experimental results. It was observed that cluster decay modes leading to the formation of 208Pb Daughter Nucleus have the lowest half-lives. This implies that there is a shell closure at proton number (Z) = 82 and neutron number (N) = 126. Hence, it confirms the existence of nuclear shell effect and stresses the significance of role of 208Pb Daughter Nucleus in the trans-lead cluster radioactivity. It can be noticed that the calculated half-lives for several cluster decay modes are well within the present experimental upper limit for measurements (T1/2 < 1030S). These results may be useful for future experiments.
Zhongzhou Ren - One of the best experts on this subject based on the ideXlab platform.
-
Systematic calculations on cluster radioactivity half-lives
Journal of Physics G: Nuclear and Particle Physics, 2011Co-Authors: Zongqiang Sheng, Zhongzhou RenAbstract:Half-lives of cluster radioactivity have been systematically investigated using the effective liquid drop description with the varying mass asymmetry shape and effective inertial coefficient. A new nuclear radius formula including the isospin-dependent term is presented instead of the old empirical radius formula R(p) = 1.20A(p)(1/3). The calculated half-lives with the new nuclear radius formula are in good agreement with the available experimental data and closer to the experimental values than the ones with the old nuclear radius formula. We made some predictions on the new possible island of cluster radioactivity around the double-magic Daughter Nucleus (100)Sn. The calculated results show that the alpha-like-nuclei clusters are the most probable cases for measurements in this region. We also try to find cluster radioactivities around another double-magic Daughter Nucleus (132)Sn, but there is no clear evidence for the existence of cluster radioactivity. The predictions on the half-lives of cluster radioactivity around the Daughter Nucleus (208)Pb are made as well. These results may be useful for future experiments.
-
Branching ratios of α-decay to excited states of even–even nuclei
Nuclear Physics A, 2006Co-Authors: Zhongzhou RenAbstract:We make a systematic calculation on $\alpha$-decay branching ratios to members of ground-state rotational band and to excited $0^{+}$ states of even-even nuclei by a simple barrier penetration approach. The branching ratios to the excited states of Daughter Nucleus are determined by the $\alpha$-decay energy, the angular momentum of $\alpha$-particle, and the excitation probability of the Daughter Nucleus. Our calculation covers isotopic chains from Hg to Fm in the mass regions 180$
-
Favored α-decays of medium mass nuclei in density-dependent cluster model
Nuclear Physics, 2005Co-Authors: Zhongzhou RenAbstract:We present a systematic calculation on α-decay half-lives of medium mass nuclei by the improved version of density-dependent cluster model, in which the nuclear potential between α-particle and Daughter Nucleus is obtained from the double-folding integral of the renormalized M3Y nucleon–nucleon interaction with the matter density distributions of α-particle and Daughter Nucleus, and the Coulomb potential is obtained from the double-folding integral of the proton–proton Coulomb interaction with the charge density distributions of α-particle and Daughter Nucleus. For the favored transitions from nuclear ground states, the theoretical partial half-lives of α-decay are in good agreement with experimental ones. On average, the density-dependent cluster model (DDCM) can reproduce the experimental α-decay half-lives of nuclei with Z=52–80 to within a factor of 3 or better. Therefore DDCM gives reliable and accurate results for favored α-decays in the medium mass region.
-
DENSITY-DEPENDENT CLUSTER MODEL OF α DECAY
International Journal of Modern Physics B, 2005Co-Authors: Zhongzhou RenAbstract:A new cluster model of α decay is proposed where the effective potential between α-cluster and Daughter Nucleus is obtained from the double folding integral of the renormalized M3Y nucleon-nucleon interaction and of the density distributions of α particle and Daughter Nucleus. Without introducing any extra adjustment on the potential, the new model (named as the density-dependent cluster model) can successfully reproduce the experimental half-lives of α decay within a factor of 3. The model also works well for new superheavy elements which are the current interests of nuclear physics and chemistry.
-
systematical calculation of α decay half lives by density dependent cluster model
Nuclear Physics, 2005Co-Authors: Zhongzhou RenAbstract:Abstract Systematical calculations on the α decay half-lives of nuclei are carried out in a new cluster model (density-dependent cluster model) where the effective potential between α cluster and Daughter Nucleus is obtained from the double folded integral of the renormalized M3Y nucleon–nucleon interaction with the density distributions of the α particle and the Daughter Nucleus. The model reproduces the experimental half-lives within a factor of 3 for many nuclei. The model also works well for new superheavy elements which are the current interests of nuclear physics and chemistry. This successful description of α decay data is due to the correct incorporation of the low-density behavior of the effective nucleon–nucleon interaction in the popular M3Y potential. The effective α-core potential of the density-dependent cluster model is analyzed and discussed.
G.s. Swamy - One of the best experts on this subject based on the ideXlab platform.
-
role of 208pb Daughter Nucleus and nuclear shell effects in trans lead cluster radioactivity by emission of neon clusters from 218 236u isotopes
Annalen der Physik, 2012Co-Authors: G.s. Swamy, T.k. UmeshAbstract:In the present work, the cluster radioactivity of even A uranium isotopes (218–236U) with the emission of both alpha-like and non-alpha-like neon clusters (20,22,24,26,28Ne) was studied. The decimal logarithm of half-lives (expressed in seconds) were calculated by three different approaches based on (i) the single line of Universal curve (UNIV) for alpha and cluster radioactive decay, (ii) the Universal Decay law (UDL) and (iii) by considering a fission-like model in which the interacting nuclear potential barrier was taken to be the sum of Coulomb and proximity potentials (CPPM) respectively. Based on the half-lives calculated by using the three different approaches mentioned above, significance of the role of 208Pb Nucleus (doubly magic Nucleus) and nuclear shell effects in trans-lead cluster radioactivity were investigated. The calculated half-lives have also been compared with available experimental results. It was observed that cluster decay modes leading to the formation of 208Pb Daughter Nucleus have the lowest half-lives. This implies that there is a shell closure at proton number (Z) = 82 and neutron number (N) = 126. Hence, it confirms the existence of nuclear shell effect and stresses the significance of role of 208Pb Daughter Nucleus in the trans-lead cluster radioactivity. It can be noticed that the calculated half-lives for several cluster decay modes are well within the present experimental upper limit for measurements (T1/2 < 1030S). These results may be useful for future experiments.
-
Role of 208Pb Daughter Nucleus and nuclear shell effects in trans‐lead cluster radioactivity by emission of neon clusters from 218–236U isotopes
Annalen der Physik, 2012Co-Authors: G.s. Swamy, T.k. UmeshAbstract:In the present work, the cluster radioactivity of even A uranium isotopes (218–236U) with the emission of both alpha-like and non-alpha-like neon clusters (20,22,24,26,28Ne) was studied. The decimal logarithm of half-lives (expressed in seconds) were calculated by three different approaches based on (i) the single line of Universal curve (UNIV) for alpha and cluster radioactive decay, (ii) the Universal Decay law (UDL) and (iii) by considering a fission-like model in which the interacting nuclear potential barrier was taken to be the sum of Coulomb and proximity potentials (CPPM) respectively. Based on the half-lives calculated by using the three different approaches mentioned above, significance of the role of 208Pb Nucleus (doubly magic Nucleus) and nuclear shell effects in trans-lead cluster radioactivity were investigated. The calculated half-lives have also been compared with available experimental results. It was observed that cluster decay modes leading to the formation of 208Pb Daughter Nucleus have the lowest half-lives. This implies that there is a shell closure at proton number (Z) = 82 and neutron number (N) = 126. Hence, it confirms the existence of nuclear shell effect and stresses the significance of role of 208Pb Daughter Nucleus in the trans-lead cluster radioactivity. It can be noticed that the calculated half-lives for several cluster decay modes are well within the present experimental upper limit for measurements (T1/2 < 1030S). These results may be useful for future experiments.
Raj K. Gupta - One of the best experts on this subject based on the ideXlab platform.
-
Cluster emissions with Daughter from neutron-rich nuclei
Journal of Physics G: Nuclear and Particle Physics, 1996Co-Authors: Satish Kumar, J.s. Batra, Raj K. GuptaAbstract:Cluster emissions from neutron-rich , and nuclei are studied within the preformed cluster model of Malik and Gupta. Q-value estimates of the decays selected on the basis of shell effects in binding energies and their relative preformation probabilities show that these nuclei are stable (Q 0) decays are of non-alpha-like heavy clusters. The most probable decays (minimum half-life times) are the ones with a doubly magic Nucleus as the Daughter Nucleus, arising due to the WKB penetrability. Compared to the presently measurable alpha-like cluster decays of the corresponding neutron-deficient parents into a Daughter Nucleus, these decays are suppressed by many orders of magnitude.
Yanzhao Wang - One of the best experts on this subject based on the ideXlab platform.
-
Cluster radioactivity of neutron-deficient nuclei in trans-tin region
Scientific reports, 2020Co-Authors: Yonghao Gao, Jianpo Cui, Yanzhao WangAbstract:The possibility of cluster radioactivity (CR) of the neutron-deficient nuclei in the trans-tin region is explored by using the effective liquid drop model (ELDM), generalized liquid drop model (GLDM), and several sets of analytic formulas. It is found that the minimal half-lives are at Nd = 50 (Nd is the neutron number of the Daughter Nucleus) for the same kind cluster emission because of the Q value (released energy) shell effect at Nd = 50. Meanwhile, it is shown that the half-lives of α-like (Ae = 4n, Ze = Ne. Ze and Ne are the charge number and neutron number of the emitted cluster, respectively.) cluster emissions leading to the isotopes with Zd = 50 (Zd is the proton number of the Daughter Nucleus) are easier to measure than those of non-α-like (Ae = 4n + 2) cases due to the large Q values in α-like cluster emission processes. Finally, some α-like CR half-lives of the Nd = 50 nuclei and their neighbours are predicted, which are useful for searching for the new CR in future experiments.
