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Keywords:

proton drip-line, isolde, nuclei, deformations, targets, shape, beams, Decay, Temperature, Density, Science & Technology, Physical Sciences, Physics, Nuclear, Physics, PROTON DRIP-LINE, ISOLDE, NUCLEI, DEFORMATIONS, TARGETS, SHAPE, BEAMS, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, 5106 Nuclear and plasma physics

Abstract:

The beta-decay half-life of Kr-70 has been measured for the first time at the ISOLDE PSB Facility at CERN. Mass separated Kr-70 ions were produced by 1 GeV proton-induced spallation reactions in a Nb foil. The measured half-life is 57(21) ms. This value is consistent with the half-life calculated assuming a pure Fermi decay, but is clearly lower than the value used in a recent rp-process reaction flow calculation. The result shows that the reaction flow via two-proton-capture of Se-68 is 2.5 times faster than previously calculated assuming an astrophysical temperature of 1.5 GK and a density of 10(6) g/cm(3).