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

Journal Article · Sat May 15 04:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.055503· OSTI ID:21389068

Wrede, C ^[1]; Clark, J A ^[2]; Deibel, C M ^[2]; Faestermann, T; Parikh, A; Bishop, S; Eppinger, K; Kruecken, R; Lepyoshkina, O; Rugel, G ^[3]; Hertenberger, R; Wirth, H -F ^[4]; Chen, A A ^[5]; Garcia, A ^[1]; Setoodehnia, K ^[5]

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1. Department of Physics, University of Washington, Seattle, Washington 98195 (United States)
2. Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520 (United States)
3. Physik Department E12, Technische Universitaet Muenchen, D-85748, Garching (Germany)
4. Fakultaet fuer Physik, Ludwig-Maximilians-Universitaet Muenchen, D-85784, Garching (Germany)
5. 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, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 81; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCURACY
ALKALINE EARTH ISOTOPES
ALUMINIUM 24
ALUMINIUM ISOTOPES
ARGON 32
ARGON 36 TARGET
ARGON ISOTOPES
BEAMS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CALIBRATION
CHLORINE 32
CHLORINE ISOTOPES
CORRECTIONS
CORRELATIONS
DAUGHTER PRODUCTS
DECAY
DIPOLES
ELECTRON CAPTURE RADIOISOTOPES
ENERGY
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITATION
FIELD THEORIES
GRAND UNIFIED THEORY
GROUND STATES
HELIUM 3 BEAMS
ION BEAMS
ION IMPLANTATION
ISOMERIC TRANSITION ISOTOPES
ISOSPIN
ISOTOPES
KEV RANGE
LIGHT NUCLEI
MAGNESIUM 20
MAGNESIUM 24
MAGNESIUM ISOTOPES
MASS
MATHEMATICAL MODELS
MILLISECONDS LIVING RADIOISOTOPES
MULTIPOLES
NEON 20
NEON ISOTOPES
NUCLEAR DECAY
NUCLEI
ODD-ODD NUCLEI
PARTICLE MODELS
PARTICLE PROPERTIES
PHOSPHORUS 28
PHOSPHORUS ISOTOPES
POTASSIUM 36
POTASSIUM ISOTOPES
Q-VALUE
QUANTUM FIELD THEORY
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SILICON 24
SILICON 28
SILICON ISOTOPES
SODIUM 20
SODIUM ISOTOPES
STABLE ISOTOPES
STANDARD MODEL
SYMMETRY BREAKING
TARGETS
UNIFIED GAUGE MODELS