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Title: {beta} decay of {sup 32}Na

Abstract

The {beta}-decay of {sup 32}Na has been studied using {beta}-{gamma} coincidences. New transitions and levels are tentatively placed in the level scheme of {sup 32}Mg from an analysis of {gamma}-{gamma} and {beta}-{gamma}-{gamma} coincidences. The observation of the indirect feeding of the 2321 keV state in {sup 32}Mg removes some restrictions previously placed on the spin assignment for this state. No evidence of a state at 2117 keV in {sup 32}Mg is found. Previously unobserved weak transitions up to 5.4 MeV were recorded but could not be placed in the decay scheme of {sup 32}Na.

Authors:
 [1];  [1];  [2]; ; ; ; ;  [3]; ;  [3];  [4];  [5]; ; ; ; ; ;  [6];  [3];  [2] more »; ; ;  [7] « less
  1. Department of Physics, Colorado School of Mines, Golden, Colorado 80401 (United States)
  2. (Canada)
  3. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3 (Canada)
  4. (United Kingdom)
  5. Department of Physics and Astronomy, Saint Mary's University, Halifax, Nova Scotia, Canada B3H 3C3 (Canada)
  6. Department of Physics, University of Guelph, Guelph, Ontario, Canada N1G 2W1 (Canada)
  7. Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4K1 (Canada) (and others)
Publication Date:
OSTI Identifier:
20990986
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.75.017302; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BETA DECAY; ENERGY LEVELS; KEV RANGE; MAGNESIUM 32; MEV RANGE 01-10; SODIUM 32; SPIN

Citation Formats

Mattoon, C. M., Sarazin, F., TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Hackman, G., Ball, G. C., Chakrawarthy, R. S., Scraggs, H. C., Smith, M. B., Cunningham, E. S., Walker, P. M., Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, Austin, R. A. E., Finlay, P., Grinyer, G. F., Hyland, B., Phillips, A. A., Schumaker, M. A., Svensson, C. E., Garrett, P. E., Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Koopmans, K. A., Waddington, J. C., and Washbrook, B.. {beta} decay of {sup 32}Na. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.017302.
Mattoon, C. M., Sarazin, F., TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Hackman, G., Ball, G. C., Chakrawarthy, R. S., Scraggs, H. C., Smith, M. B., Cunningham, E. S., Walker, P. M., Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, Austin, R. A. E., Finlay, P., Grinyer, G. F., Hyland, B., Phillips, A. A., Schumaker, M. A., Svensson, C. E., Garrett, P. E., Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Koopmans, K. A., Waddington, J. C., & Washbrook, B.. {beta} decay of {sup 32}Na. United States. doi:10.1103/PHYSREVC.75.017302.
Mattoon, C. M., Sarazin, F., TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Hackman, G., Ball, G. C., Chakrawarthy, R. S., Scraggs, H. C., Smith, M. B., Cunningham, E. S., Walker, P. M., Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, Austin, R. A. E., Finlay, P., Grinyer, G. F., Hyland, B., Phillips, A. A., Schumaker, M. A., Svensson, C. E., Garrett, P. E., Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Koopmans, K. A., Waddington, J. C., and Washbrook, B.. Mon . "{beta} decay of {sup 32}Na". United States. doi:10.1103/PHYSREVC.75.017302.
@article{osti_20990986,
title = {{beta} decay of {sup 32}Na},
author = {Mattoon, C. M. and Sarazin, F. and TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3 and Hackman, G. and Ball, G. C. and Chakrawarthy, R. S. and Scraggs, H. C. and Smith, M. B. and Cunningham, E. S. and Walker, P. M. and Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH and Austin, R. A. E. and Finlay, P. and Grinyer, G. F. and Hyland, B. and Phillips, A. A. and Schumaker, M. A. and Svensson, C. E. and Garrett, P. E. and Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1 and Koopmans, K. A. and Waddington, J. C. and Washbrook, B.},
abstractNote = {The {beta}-decay of {sup 32}Na has been studied using {beta}-{gamma} coincidences. New transitions and levels are tentatively placed in the level scheme of {sup 32}Mg from an analysis of {gamma}-{gamma} and {beta}-{gamma}-{gamma} coincidences. The observation of the indirect feeding of the 2321 keV state in {sup 32}Mg removes some restrictions previously placed on the spin assignment for this state. No evidence of a state at 2117 keV in {sup 32}Mg is found. Previously unobserved weak transitions up to 5.4 MeV were recorded but could not be placed in the decay scheme of {sup 32}Na.},
doi = {10.1103/PHYSREVC.75.017302},
journal = {Physical Review. C, Nuclear Physics},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}
  • 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.more » 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.« less
  • Analysis of energy spectra of protons from the reactions /sup 23/Na (d,p)/sup 24/Na, /sup 27/Al (d,p)/sup 28/Al, and /sup 31/P (d,p)/sup 32/P has been carried out. Excitation energies have been measured for 97 levels of /sup 24/Na, /sup 28/Al, and /sup 32/P nuclei with uncertainties of about 1 keV. The dependence of the level density for the nuclei /sup 24/Na, /sup 28/Al, and /sup 32/P on the excitation energy is found with better accuracy, and a new method has been proposed to evaluate the number of levels omitted because of the finite energy resolution. It is shown in a formalmore » way that the densities of flow-lying levels can be equally satisfactorily described by the constant-temperature and Fermi-gas models.« less
  • We determined the absolute branch of the T=2 superallowed decay of {sup 32}Ar by detecting the {beta}{sup +}-delayed protons and {gamma} decays of the daughter state. We obtain b{sub SA}{sup {beta}}=(22.71{+-}0.16)%, which represents the first determination of a proton branch to better than 1%. Using this branch along with the previously determined {sup 32}Ar half-life and energy release, we determined ft=(1552{+-}12) s for the superallowed decay. This ft value, together with the corrected Ft value extracted from previously known T=1 superallowed decays, yields a measurement of the isospin symmetry breaking correction in {sup 32}Ar decay {delta}{sub C}{sup exp}=(2.1{+-}0.8)%. This canmore » be compared to a theoretical calculation {delta}{sub C}=(2.0{+-}0.4)%. As by-products of this work, we determined the {gamma} and proton branches for the decay of the lowest T=2 state of {sup 32}Cl, made a precise determination of the total proton branch and relative intensities of proton groups that leave {sup 31}S in its first excited state and deduced an improved value for the {sup 32}Cl mass.« less