K P Santhosh
Articles written in Pramana – Journal of Physics
Volume 55 Issue 3 September 2000 pp 375-382 Research Articles
Exotic decay in Ba isotopes via 12C emission
Considering Coulomb and proximity potentials as barriers, we have calculated the half lives for 12C emission from various Ba isotopes using different mass tables. The half life for 112Ba isotope calculated by us is 6.020×103 s which is comparable with the experimental value 5.620×103 s. From our study it is found that 114Ba is the good parent for 12C emission whose emission rate is favorable for measurement. The half lives predicted by us lie very close to those reported by Shanmugam
Volume 59 Issue 4 October 2002 pp 599-609 Research Articles
Exotic decay: Transition from cluster mode to fission mode
Exotic decay of some heavy nuclei with
Volume 59 Issue 4 October 2002 pp 679-684 Brief Reports
Effect of parent and daughter deformation on half-life time in exotic decay
Taking Coulomb and proximity potential as interacting barrier for post-scission region we calculated half-life time for different modes of exotic decay treating parent and fragments as spheres and these values are compared with experimental data. We studied the effect of deformation of parent and daughter on half-life time treating emitted cluster as spherical. When deformations are included half-life time values are found to decrease, though slightly. It is found that parent deformation alone will not produce appreciable change in half-life time since it affects relatively small pre-scission part of the barrier.
Volume 90 Issue 3 March 2018 Article ID 0035 Research Article
Theoretical studies on the α decay half-lives of hyper and normal isotopes of Po
The $\alpha$ decay half-lives of hyper and normal isotopes of Po nuclei are studied in the present work. The inclusion of $\Lambda–N$ interaction changes the half-life for $\alpha$ decay. The theoretical predictions on the $\alpha$ decay half-lives of normal Po isotopes are compared with experimental results and are seen to be matching well with each other. The neutron shell closure at $N = 126$ is found to be the same for both normal and hypernuclei. The Geiger–Nuttal (G–N) law for $\alpha$ decay is unaltered in the case of hypernuclei. The hypernuclei will decay into normal nuclei by mesonic or non-mesonic decay modes. Since the half-lives of normal Po nuclei are well within the experimental limits, our theoretical results suggest experimental verification of the $\alpha$ emission from hyper Po nuclei in a cascade process.
Volume 91 Issue 1 July 2018 Article ID 0005 Research Article
All possible tripartitions of $^{236}\rm{U}$ isotope in collinear configuration
K P SANTHOSH SREEJITH KRISHNAN JAYESH GEORGE JOSEPH
Using the recently proposed unified ternary fission model (UTFM), the tripartition of $^{236}\rm{U}$ isotope was studied for all possible fragmentations, in which the interacting potential barrier is taken as the sum of the Coulomb and proximity potentials with fragments in collinear configuration. The highest yield is obtained for the fragmentation $^{48}\rm{Ca}+^{58}\rm{Ti}+^{130}\rm{Sn}$ and next highest yield is found for $^{58}\rm{Cr}+^{46}\rm{Ar}+^{132}\rm{Sn}$,which stress the importance of doubly magic or near doubly magic nuclei in the tripartition of $^{236}\rm{U}$ isotope. The formation of $^{68}\rm{Ni}$ and $^{70}\rm{Ni}$ as the edge fragments linking the doubly magic nucleus $^{132}\rm{Sn}$ by the isotope of Si is in good agreement with experimental and theoretical studies, in the collinear cluster tripartition of $^{236}\rm{U}$ isotope which reveals the reliability of our model (UTFM) in ternary fission.
Volume 92 Issue 1 January 2019 Article ID 0006 Research Article
Decay of Z = 82−102 heavy nuclei via emission of one-proton and two-proton halo nuclei
The halo structure of a nucleus is investigated on the basis of separation energy consideration and potential energy calculations. Most of the predictions on the existence of halo nuclei are found to agree with the available experimental studies. For the first time, the possibility of emitting proton halo (p-halo) nuclei from heavy nuclei within the range $82 \leq Z \leq 102$ has been studied by evaluating decay half-lives for the emission of 1p-halo nuclei $^{8}\rm{B}, ^{12}\rm{N}, ^{13}\rm{N}, ^{17}\rm{F}$ and 2p-halo nuclei $^{9}\rm{C}, ^{17}\rm{Ne}, ^{18}\rm{Ne}, ^{20}\rm{Mg}$ using Coulomb and proximity potential model (CPPM). Of these, the emissions of 1p-halo nuclei $^{8}\rm{B}, ^{12}\rm{N}, ^{13}\rm{N}$ and $^{17}\rm{F}$ are found to be probable from various heavy nuclei as the half-lives of the corresponding emissions are within the experimental upper limit $(T_{1/2} \leq 10^{30} s)$. When dealing with 2p-halo nuclei, its emission is observed to be less probable compared to 1p-halo nuclei, except $^{18}\rm{Ne}$. Compared to the probability of emission of a normal cluster, the probability of emission of a p-halo nucleus from a radioactive nuclide is found to be less but still, there is a finite probability of p-halo emissions from heavy nuclei.
Volume 95 All articles Published: 5 July 2021 Article ID 0114 Research Article
Cluster decay of the superheavy nuclei $^{270-318}118$ has been studied taking Coulomb and proximity potentials as interacting barriers. This study is based on the concept of cold valley. Cluster decay half-lives and other characteristics are computed for various clusters. The predicted α decay half-life values are compared with other theoretical models and also with the sole experimental value. Plots connecting half-lives with the neutron number of the daughter nuclei as well as with the neutron number of the parent nuclei, strongly indicated neutron shell closure at $N = 184$. Also, we noted that proton shell closure occurs at $Z = 114$. From our studies, we noted that the nuclide $^{298}_{184}114$, which is doubly closed, is very stable and we could reach the inference that $^{298}_{184}114$ is the most probable nuclide to be the centre of island of stability.
Volume 95 All articles Published: 5 October 2021 Article ID 0162 Research Article
Cluster decay half-lives of trans-lead nuclei emitting clusters like C, N, O, F, Ne, Mg and Si are
studied by incorporating various cluster pre-formation probabilities to the modified generalised liquid drop model
(MGLDM). MGLDM is a method in which generalised liquid drop model (GLDM) is modified using proximity
77 potential. In this approach, we make the assumption that the cluster is pre-born inside the parent nuclei and the
pre-formation factor that depends on
Volume 96, 2022
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