Precise measurement of parity nonconservation in atomic thallium

Technical Report · Fri May 01 04:00:00 EDT 1981

DOI:https://doi.org/10.2172/6384679· OSTI ID:6384679

Hunter, L R

Observation of parity non-conservation in the 6P/sub 1/2/ - 7P/sub 1/2/ transition in /sub 81/Tl/sup 203/ /sup 205/ is reported. The transition is nominally forbidden M1 with amplitude M. Due to the violation of parity in the electron-nucleon interaction, the transition acquires an additional (parity nonconserving) amplitude e/sub p/. In the presence of an electric field, incident 293 nm circularly polarized light results in a polarization of the 7P/sub 1/2/ state through interference of the Stark amplitude with M and E/sub p/. This polarization is observed by selective excitation of the 7P/sub 1/2/ - (8S/sub 1/2) transition with circularly polarized 2.18 ..mu..m light and observation of the subsequent fluorescence at 323 nm. By utilizing this technique and carefully determining possible systematic contributions through auxiliary measurements, the circular dichroism delta = 2Im(E/sub p/)/ M is observed: delta/sub exp/ = (2.8 + 1.0 - .9) x 10/sup -3/. In addition, measurements of A(6D/sub 3/2/ - 7P/sub 1/2/) = (5.97 +- .78) x 10/sup 5/ s/sup -1/, A(7P/sub 1/2/ - 7S/sub 1/2/) = (1.71 +- .07) x 10/sup 7/ s/sup -1/ and A(7P/sub 3/2/ - 7S/sub 1/2/) = (2.37 +- .09) s/sup -1/ are reported. These values are employed in a semiempirical determination of delta based on the Weinberg-Salam Model. The result of this calculation for sin/sup 2/THETA/sub 2/ = .23 is delta/sub Theo/ = 1.7 +- .8) x 10/sup -3/.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6384679
• Report Number(s): LBL-12472; ON: DE81025214
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
645301 -- High Energy Physics-- Particle Invariance Principles & Symmetries-- General-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
74 ATOMIC AND MOLECULAR PHYSICS
ALGEBRAIC CURRENTS
BEAMS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CURRENTS
DATA
DICHROISM
ELECTRIC FIELDS
ELECTROMAGNETIC RADIATION
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
FLUORESCENCE
FORBIDDEN TRANSITIONS
HEAVY NUCLEI
INFORMATION
INVARIANCE PRINCIPLES
ISOTOPES
LASER RADIATION
LUMINESCENCE
MATHEMATICAL MODELS
NEUTRAL CURRENTS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
P INVARIANCE
P STATES
PARTICLE MODELS
POLARIZED BEAMS
RADIATIONS
RADIOISOTOPES
S STATES
STABLE ISOTOPES
THALLIUM 203
THALLIUM 204
THALLIUM ISOTOPES
UNIFIED GAUGE MODELS
WEAK NEUTRAL CURRENTS
WEINBERG LEPTON MODEL
YEARS LIVING RADIOISOTOPES