β-decay studies of 135-137Sn using selective resonance laser ionization techniques

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Beta Decay, Double Beta Decay, Electron And Muon Capture, Spectrometers And Spectroscopic Techniques, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, 90<=A<=149

Scientific paper

The decays of the very neutron rich Sn isotopes 135-137Sn were studied at CERN/ISOLDE using isotopic and isobaric selectivity achieved by the use of a resonance ionization laser ion source and mass spectroscopy, respectively. Neutron decay rates, γ-ray singles, and γ-γ coincidence data were collected as a function of time. The half-life (T1/2) and delayed neutron emission probability (Pn) values of 135Sn were measured to be 530(20) ms and 21(3)%, respectively. For 136Sn, a T1/2 of 250(30) ms was determined along with a Pn value of 30(5)%. For 137Sn, a T1/2 of 190(60) ms and a Pn value of 58(15)% were deduced. Identification of low-energy transitions in 135Sb was made possible by comparison of laser-on and laser-off γ-ray spectra. Those data combined with γ-γ coincidence spectra were used to construct a level scheme for 135Sb that includes an unexpectedly low first excited state at 282 keV. A ground state β branch of 33.2% was measured by following the growth and decay of the 135Sb daughter. Shell-model calculations are consistent with the observed 135Sb level structure and can account for a lowered first excited state.

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