Neutron and proton shell closure in the superheavy region via cluster radioactivity in 280–314116 isotopes

Abstract

Based on the concept of cold valley in fission and fusion, the radioactive decay of superheavy 280−314 116 nuclei was studied taking Coulomb and proximity potentials as the interacting barrier. It is found that the inclusion of proximity potential does not change the position of minima but minima become deeper which agrees with the earlier findings of Gupta and co-workers. In addition to alpha particle minima, the other deepest minima occur for 8 Be, 12,14 C clusters. In the fission region two deep regions are found each consisting of several comparable minima, the first region centred on 208 Pb and the second is around 132 Sn. The cluster decay half-lives and other characteristics are computed for various clusters ranging from alpha particle to 70 Ni. The computed half-lives for alpha decay match with the experimental values and with the values calculated using ViolaSeaborg-Sobiczewski (VSS) systematic. The plots connecting computed Q values and half-lives against neutron number of daughter nuclei were studied for different clusters and it is found that the next neutron shell closures occur at N = 162, 172 and 184. Isotopic and isobaric mass parabolas are studied for various cluster emissions and minima of parabola indicate neutron shell closure at N = 162, 184 and proton shell closure at Z = 114. Our study shows that 276 162 114 is the deformed doubly magic and 298 184 114 is the spherical doubly magic nuclei.

Heavy particle radioactivity from superheavy nuclei leading to 298114 daughter nuclei

“…So through our study, we could confidently predict the new island for the cluster radioactivity leading to the residual superheavy isotope 298 114 and its neighbors. We would like to mention that, the results obtained through our study closely agree with that of the early predictions [36][37][38][39][40]. Thus we have established the fact that, the isotope 298 114 should be considered as the next predicted spherical doubly magic nucleus after the experimentally observed doubly magic nuclei 208 Pb and 100 Sn.…”

“…The decay half lives in the emission of even-even clusters 4 He, 8 Be, 10 Be, 14 C, 20 O and 24 Ne from the various even-even superheavy parent isotopes 290-314 116, 294-318 118, 296-320 118, 300-324 120, 122 and 310-334 124 leading to the predicted [36][37][38][39][40] doubly magic 298 114 (Z = 114, N = 184) and the neighboring nuclei have been calculated by using the Coulomb and proximity potential model (CPPM). The possibility to have a cluster decay process is related to its exotermicity, Q > 0.…”

“…Within the preformed cluster model, Gupta et al, [38] have calculated the alpha half-life time value of 285 114, indicating that the isotope is stable against α decay and the magicity of protons at Z = 114 or of neutrons at N ≈ 172 was accounted for this stability. Alpha decay studies on Z = 122 [39] and cluster decay studies based on the concept of cold valley in fission and fusion on Z = 116 [40] by Santhosh et al, also indicate neutron shell closure at N = 162, 184 and proton shell closure at Z = 114 and have shown that 298 114 is the spherical doubly magic nuclei. The Coulomb and proximity potential model (CPPM) [41,42] and its modified version, the Coulomb and proximity potential model for deformed nuclei (CPPMDN) [43] is being used by the Santhosh et al, since the last decade for the cluster decay and alpha decay studies of heavy [44][45][46][47] and superheavy nuclei [48][49][50][51][52].…”

“…Within the preformed cluster model, Gupta et al, [38] have calculated the alpha half-life time value of 285 114, indicating that the isotope is stable against α decay and the magicity of protons at Z = 114 or of neutrons at N ≈ 172 was accounted for this stability. Alpha decay studies on Z = 122 [39] and cluster decay studies based on the concept of cold valley in fission and fusion on Z = 116 [40] by Santhosh et al, also indicate neutron shell closure at N = 162, 184 and proton shell closure at Z = 114 and have shown that 298 114…”

A Systematic Study on the Existence of 7-9B, 16-19Ne, 8-11C, 23-30P and 26-32S Nuclei via Cluster Decay in the Super Heavy Region

“…The present work aims to study the possibility for the existence of various exotic nuclei 7-9 B, [16][17][18][19] Ne, [8][9][10][11] C, 23-30 P, [26][27][28][29][30][31][32] S from even-even super heavy isotopes 274-332 116, 274-334 118, 288-334 120 with and without the inclusion of deformation effect using Coulomb and Proximity Potential Model [63][64][65][66][67]. In addition with this we would like to point out that most of the exotic nuclei belong to proton halo structure.…”