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
ISSN1092-0145
AutoresJ. Wauters, N. Bijnens, P. Dendooven, M. Huýse, Han Yull Hwang, G. Reusen, J. von Schwarzenberg, P. Van Duppen, R. Kirchner, E. Roeckl,
Tópico(s)Quantum Chromodynamics and Particle Interactions
ResumoFine 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.
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