Proton and alpha radioactivity of very neutron deficient Te, I, Xe and Cs isotopes, studied after electrostatic separation

Abstract

Abstract:In fusion reactions of 58Ni beams with 54Fe and 58Ni target nuclei neutron deficient evaporation residues have been produced and separated from the beam in an electrostatic deflector with large acceptance. The recoil nuclei were implanted and detected in an array of 100 PIN photodiodes, where also their particle decays were recorded. The assignment of the 0.81 MeV proton line to the decay of 1~ could be experimentally proven by the observation, that it is followed by the 3.31 MeV alpha emission from 1~A proton decay from llYCs was not observed. The decay energies of a number of known c~ emitters have been measured with better precision.

Proton spectroscopy beyond the drip line nearA=150

“…et al[17].The proton transitions measured in this work have been assigned to proton emission from the nuclei ' Tm, Lu, and ' 'Lu. The new proton energies and half-lives are summarized inTable I, together with a new half-life value for the proton emitter ' I which was measured…”

αDecay ofI109and Its Implications for the Proton Decay ofSbMazzocchi1, Grzywacz2, Liddick3 et al. 2007Phys. Rev. Lett.53160View full textAdd to dashboardCite

“…The measurement of the -decay energy of 109 I 56 allows an indirect measurement of the Q p value of 105 Sb 54 . Using Q p 109 I 56 828:9 4:0 keV [29], Q 108 Te 56 3445 4 keV [30], and our Q 109 I 56 we obtain Q p 105 Sb 54 356 22 keV. This corresponds to a partial proton half-life T p 1=2 4 10 6 s and branching ratio b p 3 10 ÿ7 as calculated using the WKB approximation assuming a spherical potential barrier and l 2 emission from a d 5=2 orbital.…”

First identification of γ-ray transitions in Te107

“…The 107 Te ground state to 103 Sn ground state ␣-decay Q-value is 4.012 MeV [18], corresponding to an ␣-particle kinetic energy of 3.862 MeV. An additional weak (0.5%) ␣-decay branch to the first excited state in 103 Sn at 168 keV was observed recently by Seweryniak et al [19].…”