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Your search keyword '"Behr, J.A."' showing total 24 results
Start Over Author "Behr, J.A." Publisher elsevier b.v.
24 results on '"Behr, J.A."'

3. Diffusion of Xe in Ta, Zr, and Pt

Author

Warner, T., Ball, G., Behr, J.A., Chupp, T.E., Finlay, P., Hackman, G., Hayden, M.E., Hyland, B., Koopmans, K., Nuss-Warren, S.R., Pearson, M.R., Phillips, A.A., Schumaker, M.A., Smith, M.B., Svensson, C.E., and Tardiff, E.R.

Published
2005
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6. Quadrupole moments of 20,21Na

Author

Minamisono, K., Matsuta, K., Minamisono, T., Levy, C.D.P., Nagatomo, T., Ogura, M., Sumikama, T., Behr, J.A., Jackson, K.P., Fujiwara, H., Mihara, M., and Fukuda, M.

Published
2004
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9. Polarized radioactive beam at ISAC

Author

Levy, C.D.P., Hatakeyama, A., Hirayama, Y., Kiefl, R.F., Baartman, R., Behr, J.A., Izumi, H., Melconian, D., Morris, G.D., Nussbaumer, R., Olivo, M., Pearson, M., Poutissou, R., and Wight, G.W.

Published
2003
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15. Measurement of the neutrino asymmetry in the β decay of laser-cooled, polarized 37K

Author

Melconian, D., Behr, J.A., Ashery, D., Aviv, O., Bricault, P.G., Dombsky, M., Fostner, S., Gorelov, A., Gu, S., Hanemaayer, V., Jackson, K.P., Pearson, M.R., and Vollrath, I.

Subjects
*PHYSICS, *PHYSICAL sciences, *SCIENCE, *NUCLEAR reactions
Abstract

Abstract: A measurement of the neutrino asymmetry is presented which represents the first search for new physics using polarized radioactive atoms initially cooled and confined in a magneto-optical trap. Optical pumping and photoionization techniques are used to generate and measure, in situ, a highly spin-polarized sample of the short-lived -emitter 37K. The angular distribution of neutrinos from this polarized decay, inferred from the daughter recoil asymmetry, is used to search for a hypothetical current in the weak interaction. We find the ν asymmetry parameter to be , in agreement with the standard model''s purely interaction. [Copyright &y& Elsevier]

Published
2007
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21. Specific mass shift of potassium 5P1/2 state

Author

Halloran, L.J.S., Fostner, S., Paradis, E., and Behr, J.A.

Subjects
*ISOTOPE shift, *POTASSIUM isotopes, *CHARGE transfer, *NUCLEAR charge, *HYPERFINE structure, *LASER spectroscopy
Abstract

Abstract: We have measured the isotope shift between 41K and 39K in the 4s1/2 →5p1/2 transition at 405nm using saturation spectroscopy. Our measured isotope shift is 456.1±0.8MHz, implying a residual isotope shift (sum of specific mass shift and field shift) of −52.7±0.8MHz. We deduce a specific mass shift of −40±5MHz, which would imply that the 5p1/2 state has a considerably larger specific mass shift than the 4p1/2 state. We have in addition measured the 5p1/2 hyperfine splitting for 41K. [Copyright &y& Elsevier]

Published
2009
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22. Quadrupole moments of neutron-deficient 20,21Na

Author

Minamisono, K., Matsuta, K., Minamisono, T., Levy, C.D. P., Nagatomo, T., Ogura, M., Sumikama, T., Behr, J.A., Jackson, K.P., Mihara, M., and Fukuda, M.

Subjects
*QUADRUPOLE moments, *COUPLING constants, *ENERGY levels (Quantum mechanics), *SODIUM, *NEUTRONS, *ZINC oxide, *NUCLEAR shell theory
Abstract

Abstract: The electric-quadrupole coupling constant of the ground states of the proton drip line nucleus 20Na (, ) and the neutron-deficient nucleus 21Na (, ) in a hexagonal ZnO single crystal were precisely measured to be and , respectively, using the multi-frequency β-ray detecting nuclear magnetic resonance technique under presence of an electric-quadrupole interaction. An electric-quadrupole coupling constant of 27Na in the ZnO crystal was also measured to be . The electric-quadrupole moments were extracted as and , using the electric-coupling constant of 27Na and the known quadrupole moment of this nucleus as references. The present results are well explained by shell-model calculations in the full sd-shell model space. [Copyright &y& Elsevier]

Published
2009
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23. Alignment correlation term in the β-ray angular distribution from spin aligned 20Na

Author

Minamisono, K., Matsuta, K., Minamisono, T., Levy, C.D.P., Nagatomo, T., Ogura, M., Sumikama, T., Behr, J.A., Jackson, K.P., Fujiwara, H., Mihara, M., and Fukuda, M.

Subjects
*NUCLEAR reactions, *ANGULAR correlations (Nuclear physics), *UNIVERSAL algebra, *SCATTERING (Physics)
Abstract

The alignment correlation term in the β-ray angular distribution from nuclear-spin aligned 20Na(Iπ = 2+, T1/2 = 449.7 ms) has been measured for the first time. A large enhancement of the time component d in the main axial vector current was preliminarily obtained and the higher order matrices j2 and j3 were also evaluated. In order to extract very small G-parity violating induced tensor term, the alignment correlation term of the mirror partner 20F have to be measured. [Copyright &y& Elsevier]

Published
2004
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24. Measuring isospin mixing in 36Ar using a polarized, neutral atom trap

Author

Melconian, D., Ashery, D., Ball, G., Behr, J.A., Bricault, P., Brown, B.A., Dombsky, M., Jackson, K.P., Fostner, S., Gorelov, A., Groves, M.N., Gu, S., Pearson, M.R., Towner, I.S., Trinczek, M., and Vollrath, I.

Subjects
*ION traps, *RADIOACTIVE substances, *RADIOACTIVE decay, *ISOBARIC spin
Abstract

Magneto-optical traps provide a cold, compact cloud of radioactive atoms and therefore are an ideal source for use in precision nuclear β decay studies. Optical pumping techniques can add a new dimension to such experiments by efficiently polarizing these samples to ≳99%. Triumf’s experiment E925 is utilizing these techniques to prepare to measure the isospin mixing between the first two Iπ=2+ excited states of 36Ar with the lowest 2+, T=1 isobaric analog state. The spin-polarized 36K β+ decay observables will be measured using Triumf’s neutral atom trap at Isac, Triumf’s isotope separator and accelerator facility. The main purpose is to test isospin mixing models in the s,d-shell needed for determination of the superallowed Fermi strength in 0+ → 0+ decays. [Copyright &y& Elsevier]

Published
2003
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