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Fine structure in the alpha decay of even-even nuclei as an experimental proof for the stability of the Z =82 magic shell at the very neutron-deficient side

1994; American Physical Society; Volume: 72; Issue: 9 Linguagem: Inglês

10.1103/physrevlett.72.1329

1092-0145

J. Wauters, N. Bijnens, P. Dendooven, M. Huýse, Han Yull Hwang, G. Reusen, J. von Schwarzenberg, P. Van Duppen, R. Kirchner, E. Roeckl,

Quantum Chromodynamics and Particle Interactions

Fine structure has been observed in the \ensuremath{\alpha} decay of $^{202}\mathrm{Rn}$, $^{194,196,198}\mathrm{Po}$, $^{186,188}\mathrm{Pb}$, and $^{180,182,184}\mathrm{Hg}$ and has led to the identification of low-lying ${0}^{+}$ states in $^{198}\mathrm{Po}$, $^{190,192,194}\mathrm{Pb}$, $^{182,184}\mathrm{Hg}$, and $^{176,178,180}\mathrm{Pt}$. The large variation in the hindrance factors of the \ensuremath{\alpha} decay to the exicted ${0}^{+}$ state is a proof for the persistence of the Z=82 shell closure at the neutron-deficient side. Comparing the reduced widths of the \ensuremath{\alpha} 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.