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Keywords:

neutron-deficient, coexistence, isotopes, nuclei, shape, bands, Science & Technology, Physical Sciences, Physics, Nuclear, Physics, NEUTRON-DEFICIENT, COEXISTENCE, ISOTOPES, NUCLEI, SHAPE, BANDS, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, 5106 Nuclear and plasma physics

Abstract:

Fine structure in the α decay of mass-separated Pb186 and Hg184 has been studied at the GSI on-line mass separator. Alpha singles spectra as well as α-x-t and α-e-t coincidence events were collected. The α decay of Pb186 revealed feeding to a low-lying 0+ state at 328(12) keV in Hg182. This state can be interpreted as being the bandhead of the deformed rotational band observed previously in in-beam studies. In the α decay of Hg184, feeding towards the first excited 2+ state at 153 keV and the 02+ state at 478 keV in Pt180 was observed. The hindrance factor of the α decay towards the excited 0+ state gives information about the particle-hole character of the states connected in the α decay. A two-level mixing calculation is introduced. From the mixing in Pt and the α-decay hindrance factors, small mixing is deduced fro ground stattes of neutron-deficient Hg and Pb nuclei. © 1994 The American Physical Society.