‘Magic’ nucleus 42Si

J. Fridmann, I. Wiedenhöver, A. Gade, L. T. Baby, D. Bazin, B. A. Brown, C. M. Campbell, J. M. Cook, P. D. Cottle (), E. Diffenderfer, D.-C. Dinca, T. Glasmacher, P. G. Hansen, K. W. Kemper, J. L. Lecouey, W. F. Mueller, H. Olliver, E. Rodriguez-Vieitez, J. R. Terry, J. A. Tostevin and K. Yoneda
Additional contact information
J. Fridmann: Florida State University
I. Wiedenhöver: Florida State University
A. Gade: Michigan State University
L. T. Baby: Florida State University
D. Bazin: Michigan State University
B. A. Brown: Michigan State University
C. M. Campbell: Michigan State University
J. M. Cook: Michigan State University
P. D. Cottle: Florida State University
E. Diffenderfer: Florida State University
D.-C. Dinca: Michigan State University
T. Glasmacher: Michigan State University
P. G. Hansen: Michigan State University
K. W. Kemper: Florida State University
J. L. Lecouey: Michigan State University
W. F. Mueller: Michigan State University
H. Olliver: Michigan State University
E. Rodriguez-Vieitez: Lawrence Berkeley National Laboratory
J. R. Terry: Michigan State University
J. A. Tostevin: University of Surrey
K. Yoneda: Michigan State University

Nature, 2005, vol. 435, issue 7044, 922-924

Abstract: Silicon: the question is 42 Dramatic advances are being made in nuclear structure physics because of the availability of facilities producing beams of exotic radioisotopes. Of these, silicon-42 is of particular interest for study of the effects of packing extra neutrons into a nucleus. Neutrons and protons in atomic nuclei are arranged in a series of energy levels or ‘shells’. When a shell has a full quota of particles, the nucleus is particularly stable: the ‘magic numbers’ for stability are 2, 8, 20, 28, 50, 82 and 126. Silicon-42 owes its existence to its 28 neutrons, but is still a short-lived atom. This short lifetime has been explained as a consequence of strong deformation but this is contradicted in a new study that suggests that silicon-42 is almost spherical.

Date: 2005
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DOI: 10.1038/nature03619

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