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Coincidences have been detected between γ-rays and β-delayed protons emitted after the decay of very neutron-deficient nuclei. In the three cases studied the decay proceeds to the ground state with branches to the first excited (2+) state of the even daughter nucleus of (58±7) % (115Xe to 709 keV in 114Te), (14±3) % (117Xe to 679 keV in 116Te), and (50±10) % (181Hg to 158 keV in 180Pt). Upper limits of 2 and 6 % can be placed on the branches to the 4+ states of 114Te and 180Pt. For the cases of 115,117Xe, coincidences with annihilation radiation were also observed; the measured positon/proton ratio determines the difference Q—Bp, between the energy available for electron capture and the proton separation energy for the daughter. For 115Xe the result is 6.20±0.13 MeV, for 117Xe 4.10±0.20 MeV. 相似文献
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