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[en] Using Green's function techniques, we derive expressions for the width of a proton decaying state in spherical and deformed nuclei. We show that the proton decay widths calculated by the ''exact'' expressions of Maglione et al. are equivalent to the distorted wave expressions of Bugrov et al., and that of Aaberg et al. in the spherical case. (c) 2000 The American Physical Society

[en] Ground state proton radioactivity determines the limit of nuclei on the neutron deficient side of the valley of stability. It is predicted that the partial proton halflives decrease to values below ions within a window of only a few isotopes. Presently seven radioactive proton transitions are known. The basic features of this decay made are described and experimental methods and results are reviewed

[en] The proton emission from ground-state spherical nuclei is investigated exactly through the numerical solution of the time-dependent Schroedinger equation for initial single-proton quasistationary states. Contrary to common belief, it is shown that such calculations can be performed for any proton half-life ranging from 10^-22-20 s, the longest proton lifetime observed at present. The important and careful choice of the initial metastable state is clarified. Applied to the calculation of the decay width of several ground-state spherical emitters, this method gives comparable results with the distorted wave-Born approximation and therefore justifies its use. (c) 2000 The American Physical Society

[en] Considerable progress has been made in recent years to study and understand proton- and neutron-rich nuclei near the driplines. However, not all of the interesting physics is limited to particle-stable nuclei. To illustrate, the author discusses a kinematically complete decay study of the two-proton emitter ¹²O. Over 30 years ago GoIdanskii predicted ground state two-proton emission in some proton-rich even-Z nuclei. Because this decay process appears at the proton-rich limit of stability, only one case (⁶Be) had been studied experimentally prior to this work. The authors finds no evidence for ²He emission in the ¹²O decay despite previous predictions for a large diproton branching ratio. On the other hand, the decay is not consistent with pure three-body phase-space breakup. The author presents model studies of the ¹²O decay and discusses implications for the structure of the proton-rich ¹²O system

[en] Two-proton radioactivity studies have been performed on excited states of ¹⁸Ne produced by ²⁰Ne fragmentation at the FRIBs facility of the Laboratori Nazionali del Sud. The study of the relative-momentum correlations of the two protons allowed to disentangle the diproton, democratic and sequential decay contributions to the 2p emission. In order to extend the study on two-proton decay to other light-masses nuclei, an upgrade of the FRIBs facility is planned. A new configuration of the Fragment Separator would be able to increase the acceptance of the beam line and therefore the yield of the produced radioactive beams. Also the present tagging setup will be modified in view of the gain intensity, in order to sustain the higher foreseen incoming rate. Status and perspectives of the facility will be presented. (author)

[en] An expression for determining the n/p ratio in heavy-ion reactions has been tested using recently published data. The agreement between the calculated and measured ratios is satisfactory. (author)

[en] We formulate a theory of the two-proton radioactivity based on the real-energy continuum shell model. This microscopic approach is applied to describe the two-proton decay of the 1₂^- state in ¹⁸Ne

[en] Two-proton radioactivity was predicted more than 40 years ago. According to recent theoretical predictions, proton drip-line nuclei in the A=40-55 region were identified as the most promising candidates. The recent observation of two-proton radioactivity of 45Fe confirmed these predictions nicely. In the present paper, we will summarize experimental results for the decay of 45Fe, which include data from the 2002 discovery of this radioactivity, but also new data. In addition, we will report on the first observation of 54Zn and its decay by two-proton radioactivity, the second case of this new decay mode. Finally, we will discuss tentative evidence for a small two-proton radioactivity branch for 48Ni. These experimental results are confronted to modern theories which succeed in describing reasonably well this decay mode

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