Abstract
The possibility for the existence of 1-neutron and 2-neutron halo nuclei through the decay of even-even nuclei 270-316116, 272-318118 and 278-320120 in the super-heavy region is studied within the frame work of the Coulomb and Proximity Potential Model (CPPM). Halo structure in neutron rich nuclei with Z<=20 is identified by calculating the neutron separation energies and on the basis of potential energy considerations. The 1n + core configuration of proposed 1-neutron halo nuclei between z=10 and Z=20 is found shifted to 2n + core configuration in higher angular momentum states. The calculation of half-life of decay is performed by considering the proposed halo nuclei as spherical cluster and as deformed nuclei with a rms radius. Except for 15C, the half-life of decay is found decreased when the rms radius is considered. Only the 1-neutron halo nuclei 26F and 55Ca showed half-lives of decay which are less than the experimental limit. None of the proposed 2-neutron halo nuclei have shown a half-life of decay lower than the experimental limit. Also, the probability for the emission of neutron halo nuclei is found to be less in super-heavy region when compared with the clusters of same isotope family. Further, neutron shell closure at neutron numbers 150, 164 and 184 is identified form the plot of log10 T1/2 verses the neutron number of parents. The plots of Q-1/2 verses log10 T1/2 and -ln P verses log10 T1/2 for various halo nuclei emitted from the super-heavy elements are found to be linear showing that Geiger-Nuttall law is applicable to the emission of neutron halo also.
Highlights
The stability of a nucleus is mainly determined by the binding energy per nucleon
We have studied the decay of 1n- and 2n- halo nuclei with Z = - 20 through cluster radioactivity from the superheavy elements 270-316116, 272-318118 and 278-320120 by using the Coulomb and Proximity Potential Model (CPPM)
The decay half-life of 1n and 2n halo nuclei from 270-316116, 272-318118 and 278-320120 is studied within the frame work of Coulomb and Proximity Potential Model
Summary
The stability of a nucleus is mainly determined by the binding energy per nucleon. For stable nuclei, the typical value of binding energy per nucleon is in the range of 6-8 MeV. The stability of the nucleus ends at the drip lines where the last nucleons are no longer attached to the nucleus by the strong nuclear interaction [1] This leads to an important observation in many nuclei near the drip line; the last one or two nucleons, either proton or neutron, are found to be very loosely bounded to the core of the nucleus. The separation energies of such nucleons are very low, typically less than 1 MeV As a result, these weakly bound nucleons are free to occupy a larger volume and the nuclear matter density distribution is found to be extended more in space leads to a nuclear radius which is much larger than that of the normal nucleus. A large number of studies on the interaction and reaction cross-sections involving halo nuclei near the drip line can be found in the literature [24,25,26,27,28].
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