Hyperfine structure and isotope shift of /sup 205/Pb

Thesis/Dissertation · Mon Dec 31 23:00:00 EST 1979

OSTI ID:5331353

Wiggins, R L

The hyperfine structure (hfs) of 1.43 x 10/sup 7/-y /sup 205/Pb (I = 5/2) and its isotope shift from /sup 208/Pb were measured using optical absorption spectroscopy. The hfs was then determined to greater precision using level crossing spectroscopy. Nuclear moments were calculated from the observed hfs. The optical absorption of the 283.3-nm, 6p/sup 2/ /sup 3/P/sub 0/ ..-->.. 6p7s /sup 3/P/sub 1//sup 0/ transition in a vapor of atomic /sup 205/Pb was analyzed with a 9.1-m focal length Czerny-Turner monochromator having a 25-cm blazed diffraction grating used in autocollimation near 63/sup 0/. Spectra were recorded both photographically and using scanned photoelectric detection. Cells containing > 10/sup 15/ atoms of isotopically pure /sup 205/Pb were examined. Calibration derived from a narrow-linewidth absorption beam of natural lead. The measured isotope shift and hfs interaction constants were IS(/sup 208/Pb-/sup 205/Pb) = 129.5 (2.6) mK, A(/sup 3/P/sub 1//sup 0/) = +70.4 (7) mK, and B(/sup 3/P/sub 1/) = -0.5 (1.3) mK. The level crossing measurements examined the Dm = 2 crossings in rectangular geometry. Excitation derived from a lead flow-lamp and detection combined field sweeping, lock-in detection of magnetic modulation, and extensive digital integration. The principal crossing was determined to occur at 3357.7 (21) G, giving a dipole interaction constant A = 70.52 (12)mK. Nuclear moments were calculated from the hfs interaction constants: ..mu..(/sup 205/Pb) = +0.707 (2)..mu../sub N/ (uncorrected), and Q(/sup 205/Pb) = -0.06 (23) barns (uncorrected). The magnetic-dipole moment agrees with that predicted from a configuration mixing calculation with pion exchange contributions.

• Research Organization: New York Univ., NY (USA)
• OSTI ID: 5331353
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
ABSORPTION SPECTROSCOPY
BETA DECAY RADIOISOTOPES
DIPOLE MOMENTS
ELECTRON CAPTURE RADIOISOTOPES
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXCITATION
HEAVY NUCLEI
HYPERFINE STRUCTURE
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LEAD 205
LEAD 208
LEAD ISOTOPES
MAGNETIC DIPOLE MOMENTS
MAGNETIC MOMENTS
MONOCHROMATORS
NUCLEI
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SPECTRA
SPECTRAL SHIFT
SPECTROSCOPY
STABLE ISOTOPES
YEARS LIVING RADIOISOTOPES