Hyperfine Structure of the Metastable (1s22s2p) P3 States of Be94 and the Nuclear Electric Quadrupole Moment

Arthur G. Blachman and Allen Lurio
Phys. Rev. 153, 164 – Published 5 January 1967
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Abstract

The hyperfine structure (hfs) of Be9(I=32)4 in its metastable (1s22s2p) P23 and P13 atomic states has been measured by the atomic-beam magnetic-resonance method. The zero-field hfs intervals in the P23 state are {Δν(12,32),=187.6157±0.0042 Mcsec,}{Δν(32,52),=312.0226±0.0021 Mcsec,}{Δν(52,72),=435.4773±0.0021 Mcsec.} The zero-field hfs intervals in the P13 state are {Δν(12,32),=202.9529±0.0015 Mcsec,}{Δν(32,52),=354.4365±0.0027 Mcsec.} In order to obtain the dipole and quadrupole coupling constants from the hfs separations, second- and third-order corrections arising from off-diagonal matrix elements of the hyperfine interaction between the P3 fine-structure levels must be included. The values of the hfs interaction constants before and after secondand third-order corrections are: The individual-electron interaction constants, calculated from the corrected values of A and B, are {as,=460.2±1.6 Mcsec,}{a32,=12.65±0.54 Mcsec,}{b32,=1.467±0.042 Mcsec.} The reason for the larger error limits in the corrected, compared with the uncorrected, numbers is discussed and the experimental values of as and a32 are compared with theory. Measurements of the magnetic field dependence of the hfs lead to the following estimate for the P3 fine-structure separations: {W(P23)W(P13),=71.86±0.24 Gcsec,}{W(P13)W(P03),=19.41±0.19 Gcsec.} From the ratio b32a32 the quadrupole moment, without Sternheimer polarization corrections, is Q=+0.049±0.003 b. Expressions for the third-order corrections to the zero-field hyperfine energies are given, and estimates of the intermediate coupling coefficients c1 and c2 are discussed.

  • Received 17 August 1966

DOI:https://doi.org/10.1103/PhysRev.153.164

©1967 American Physical Society

Authors & Affiliations

Arthur G. Blachman* and Allen Lurio

  • IBM Watson Laboratory at Columbia University, New York, New York

  • *Present address: IBM Watson Research Center, Yorktown Heights, New York.

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Vol. 153, Iss. 1 — January 1967

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