Evidence from. cap alpha. decay that Z = 82 is not magic for light Pb isotopes

Journal Article · Mon Oct 22 04:00:00 EDT 1984 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.53.1623· OSTI ID:6234055

Toth, K S; Ellis-Akovali, Y A; Bingham, C R; Moltz, D M; Sousa, D C; Carter, H K; Mlekodaj, R L; Spejewski, E H

To resolve the reported anomalous behavior of the ..cap alpha..-decay rates of /sup 186,188,190,192/Pb we determined more accurate ..cap alpha..-decay branches for these isotopes. Our data result in ..cap alpha..-decay reduced widths whose dependence on N is similar to that observed for other elements. However, contrary to the expectation of a shell effect at Z = 82, this new information indicates lead nuclei to be less hindered toward ..cap alpha.. decay than mercury isotopes. It appears that midway between n = 82 and N = 126 the proton number of 82 is not magic.

• Research Organization: Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
• DOE Contract Number: AC05-76OR00033; AS05-76ER04936
• OSTI ID: 6234055
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 53:17; ISSN PRLTA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY
ALPHA DECAY RADIOISOTOPES
BRANCHING RATIO
COINCIDENCE SPECTROMETRY
DECAY
EVEN-EVEN NUCLEI
GAMMA SPECTRA
HEAVY NUCLEI
ISOTOPES
LEAD 186
LEAD 188
LEAD 190
LEAD 192
LEAD ISOTOPES
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEI
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SHELL MODELS
SPECTRA
X-RAY SPECTRA