large variation in the hindrance factors of the a decay to the excited 0+ state is a proof for the persistence of the Z 82 shell closure at the neutron-deficient side. Comparing the reduced widths of the a decays to the ground and excited states offers a unique way to probe the proton particle-hole character of the 0+ states in this region.PACS numbers: 23.60.+e, 21.60. Cs, 27.70.+q, 27.80.+w Alpha decay, although one of the oldest study objects in nuclear physics, remains an intriguing decay mode.The explanation of the striking relation between the adecay half-life and the a-decay energy, known as the Geiger-Nuttall law, was one of the prominent successes of quantum mechanics [1,2]. Later on, Rasmussen [3] proposed to extract from the partial a-decay half-lives and the a-decay energies, the reduced a widths (8 ), a

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The e decay of mass-separated 18Spb and 18~has been studied at the GSI on-line mass separator. Alpha singles spectra as well as a :-X -t and e-e -t coincidence events were collected. Fine structure in the e decay of 188pb was measured for the first time, feeding the 2 + and 0~-states in 184Hg. The e decay of ~8~ feeds low-lying states in 176'178pt. One of these states could be identified as a 0 + state. The deexcitation pattern could be established. As a by-product an alpha-decay scheme of 18~ towards levels in 176Ir is given. The experimentThe 188pb and 18o, 182Hg isotopes were produced at the GSI mass-separator facility at Darmstadt, in the following fusion-evaporation reactions: