Toward precise Q{sub EC} values for the superallowed 0{sup +}->0{sup +} beta decays of T=2 nuclides: The masses of {sup 20}Na, {sup 24}Al, {sup 28}P, and {sup 32}Cl
- Department of Physics, University of Washington, Seattle, Washington 98195 (United States)
- Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520 (United States)
- Physik Department E12, Technische Universitaet Muenchen, D-85748, Garching (Germany)
- Fakultaet fuer Physik, Ludwig-Maximilians-Universitaet Muenchen, D-85784, Garching (Germany)
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada)
High-precision measurements of superallowed 0{sup +}->0{sup +} beta decays of T=2 nuclides such as {sup 20}Mg, {sup 24}Si, {sup 28}S, and {sup 32}Ar can contribute to searches for physics beyond the standard model of particle physics if the Q{sub EC} values are accurate to a few keV or better. As a step toward providing precise Q{sub EC} values for these decays, the ground-state masses of the respective daughter nuclei {sup 20}Na, {sup 24}Al, {sup 28}P, and {sup 32}Cl have been determined by measuring the ({sup 3}He,t) reactions leading to them with the {sup 36}Ar({sup 3}He,t){sup 36}K reaction as a calibration. A quadrupole-dipole-dipole-dipole (Q3D) magnetic spectrograph was used together with thin ion-implanted carbon-foil targets of {sup 20}Ne, {sup 24}Mg, {sup 28}Si, {sup 32}S, and {sup 36}Ar. The masses of {sup 20}Na and {sup 32}Cl are found to be in good agreement with the values from the 2003 Atomic Mass Evaluation (AME03) [G. Audi, A. H. Wapstra, and C. Thibault, Nucl. Phys. A 729, 337 (2003)], and the precision has been improved by a factor of 6 in both cases. The masses of {sup 24}Al and {sup 28}P are found to be higher than the values from AME03 by 9.5 keV (3.2sigma) and 11.5 keV (3.6sigma), respectively, and the precision has been improved by a factor of 2.5 in both cases. The new {sup 32}Cl mass is used together with the excitation energy of its lowest T=2 level and the mass of {sup 32}Ar to derive an improved superallowed Q{sub EC} value of 6087.3(22) keV for this case. The effects on quantities related to standard-model tests including the beta-nu correlation coefficient a and the isospin-symmetry-breaking correction delta{sub C} are examined for the A=32 case.
- OSTI ID:
- 21389068
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 81, Issue 5; Other Information: DOI: 10.1103/PhysRevC.81.055503; (c) 2010 The American Physical Society; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACCURACY
ALUMINIUM 24
ARGON 32
ARGON 36 TARGET
BETA DECAY
CALIBRATION
CHLORINE 32
CORRECTIONS
CORRELATIONS
DAUGHTER PRODUCTS
DIPOLES
EXCITATION
GROUND STATES
HELIUM 3 BEAMS
ION IMPLANTATION
ISOSPIN
KEV RANGE
MAGNESIUM 20
MAGNESIUM 24
MASS
NEON 20
PHOSPHORUS 28
POTASSIUM 36
Q-VALUE
SILICON 24
SILICON 28
SODIUM 20
STANDARD MODEL
SYMMETRY BREAKING
ALKALINE EARTH ISOTOPES
ALUMINIUM ISOTOPES
ARGON ISOTOPES
BEAMS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHLORINE ISOTOPES
DECAY
ELECTRON CAPTURE RADIOISOTOPES
ENERGY
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
FIELD THEORIES
GRAND UNIFIED THEORY
ION BEAMS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
MAGNESIUM ISOTOPES
MATHEMATICAL MODELS
MILLISECONDS LIVING RADIOISOTOPES
MULTIPOLES
NEON ISOTOPES
NUCLEAR DECAY
NUCLEI
ODD-ODD NUCLEI
PARTICLE MODELS
PARTICLE PROPERTIES
PHOSPHORUS ISOTOPES
POTASSIUM ISOTOPES
QUANTUM FIELD THEORY
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SILICON ISOTOPES
SODIUM ISOTOPES
STABLE ISOTOPES
TARGETS
UNIFIED GAUGE MODELS