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8 results on '"Finlay, P."'

1. High-Precision Branching Ratio Measurement and Spin Assignment Implications for $^{62}$Ga Superallowed $��$ Decay

Author

MacLean, A. D., Laffoley, A. T., Svensson, C. E., Ball, G. C., Leslie, J. R., Andreoiu, C., Babu, A., Bhattacharjee, S. S., Bidaman, H., Bildstein, V., Burbadge, C., Bowry, M., Cheng, C., Cross, D. S., Diaz-Varela, A., Dillmann, I., Dunlop, M. R., Dunlop, R., Evitts, L. J., Finlay, P., Gillespie, S., Garnsworthy, A. B., Garrett, P. E., Gopaul, E., Griffin, C. J., Grinyer, G. F., Hackman, G., Henderson, J., Jigmeddorj, B., Leach, K. G., Kassanda, E., McAfee, J., Moukaddam, M., Natzke, C., Nittala, S., Olaizola, B., Park, J., Paxman, C., Pore, J. L., Porzio, C., Radich, A. J., Ruotsalainen, P., Saito, Y., Sharma, S., Smallcombe, J., Smith, J. K., Sultana, R., Turko, J., Williams, J., Yates, D., and Zidar, T.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

A high-precision branching ratio measurement for the superallowed Fermi $��^{+}$ emitter $^{62}$Ga was performed with the Gamma-Ray Infrastructure for Fundamental Investigations of Nuclei (GRIFFIN) spectrometer at the Isotope Separator and Accelerator (ISAC) radioactive ion beam facility at TRIUMF. The high efficiency of the GRIFFIN spectrometer allowed 63 $��$-ray transitions, with intensities down to $\approx$1 part per million (ppm) per $^{62}$Ga $��^{+}$ decay, to be placed in the level scheme of the daughter nucleus $^{62}$Zn, establishing the superallowed $��$ branching ratio for $^{62}$Ga decay to be 99.8577$^{+0.0023}_{-0.0029}\%$, a factor of 4 more precise than the previous world average. For several cascades, $��-��$ angular correlation measurements were performed to assign spins and/or determine the mixing ratios of transitions. In particular, the spin of the 2.342 MeV excited state in the daughter nucleus $^{62}$Zn was definitively assigned as $J = 0$. This assignment resolves a discrepancy between previous measurements and has important implications for the isospin symmetry breaking correction, $��_{C1}$, in $^{62}$Ga superallowed Fermi $��$ decay., A text label in Figure 12 has been corrected compared to the original submission

Published
2020
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2. Structure of states in 12Be via the 11Be(d,p) reaction

Author

Kanungo, R., Gallant, A.T., Uchida, M., Andreoiu, C., Austin, R.A.E., Bandyopadhyay, D., Ball, G.C., Becker, J.A., Boston, A.J., Boston, H.C., Brown, B.A., Buchmann, L., Colosimo, S.J., Clark, R.M., Cline, D., Cross, D.S., Dare, H., Davids, B., Drake, T.E., Djongolov, M., Finlay, P., Galinski, N., Garrett, P.E., Garnsworthy, A.B., Green, K.L., Grist, S., Hackman, G., Harkness, L.J., Hayes, A.B., Howell, D., Hurst, A.M., Jeppesen, H.B., Leach, K.G., Macchiavelli, A.O., Oxley, D., Pearson, C.J., Pietras, B., Phillips, A.A., Rigby, S.V., Ruiz, C., Ruprecht, G., Sarazin, F., Schumaker, M.A., Shotter, A.C., Sumitharachchi, C.S., Svensson, C.E., Tanihata, I., Triambak, S., Unsworth, C., Williams, S.J., Walden, P., Wong, J., and Wu, C.Y.

Subjects
Nuclear and High Energy Physics
Published
2010
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3. Measurement of the $��$-asymmetry parameter of $^{67}$Cu in search for tensor type currents in the weak interaction

Author

Soti, G., Wauters, F., Breitenfeldt, M., Finlay, P., Herzog, P., Knecht, A., K��ster, U., Kraev, I. S., Porobic, T., Prashanth, P. N., Towner, I. S., Tramm, C., Z��kouck��, D., and Severijns, N.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex)
Abstract

Precision measurements at low energy search for physics beyond the Standard Model in a way complementary to searches for new particles at colliders. In the weak sector the most general $��$ decay Hamiltonian contains, besides vector and axial-vector terms, also scalar, tensor and pseudoscalar terms. Current limits on the scalar and tensor coupling constants from neutron and nuclear $��$ decay are on the level of several percent. The goal of this paper is extracting new information on tensor coupling constants by measuring the $��$-asymmetry parameter in the pure Gamow-Teller decay of $^{67}$Cu, thereby testing the V-A structure of the weak interaction. An iron sample foil into which the radioactive nuclei were implanted was cooled down to milliKelvin temperatures in a $^3$He-$^4$He dilution refrigerator. An external magnetic field of 0.1 T, in combination with the internal hyperfine magnetic field, oriented the nuclei. The anisotropic $��$ radiation was observed with planar high purity germanium detectors operating at a temperature of about 10\,K. An on-line measurement of the $��$ asymmetry of $^{68}$Cu was performed as well for normalization purposes. Systematic effects were investigated using Geant4 simulations. The experimental value, $\tilde{A}$ = 0.587(14), is in agreement with the Standard Model value of 0.5991(2) and is interpreted in terms of physics beyond the Standard Model. The limits obtained on possible tensor type charged currents in the weak interaction hamiltonian are -0.045 $< (C_T+C'_T)/C_A

Published
2014
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4. High-Precision Measurement of the 19Ne Half-Life and Implications for Right-Handed Weak Currents

Author

Triambak, S., Finlay, P., Sumithrarachchi, C. S., Hackman, G., Ball, G. C., Garrett, P. E., Svensson, C. E., Cross, D. S., Garnsworthy, A. B., Kshetri, R., Orce, J. N., Pearson, M. R., Tardiff, E. R., Al-Falou, H., Austin, R. A. E., Churchman, R., Djongolov, M. K., D'Entremont, R., Kierans, C., Milovanovic, L., O'Hagan, S., Reeve, S., Sjue, S. K. L., and Williams, S. J.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

We report a precise determination of the 19Ne half-life to be $T_{1/2} = 17.262 \pm 0.007$ s. This result disagrees with the most recent precision measurements and is important for placing bounds on predicted right-handed interactions that are absent in the current Standard Model. We are able to identify and disentangle two competing systematic effects that influence the accuracy of such measurements. Our findings prompt a reassessment of results from previous high-precision lifetime measurements that used similar equipment and methods., Comment: 5 pages and 5 figures. Paper accepted for publication in Phys. Rev. Lett

Published
2012
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5. Lifetimes of high-spin states in Kr-76

Author

Valiente-Dobon, Jj, Svensson, Ce, O Leary, Cd, Ragnarsson, I., Andreoiu, C., Austin, Rae, Michael Patten Carpenter, Dashdorj, D., Finlay, P., Freeman, Sj, Garrett, Pe, Gorgen, A., Greene, J., Grinyer, Gf, Hyland, B., Jenkins, D., Johnston-Theasby, F., Joshi, P., Kelsall, Ns, Macchiavelli, Ao, Moore, F., Mukherjee, G., Phillips, Aa, Reviol, W., Sarantites, D., Schumaker, Ma, Seweryniak, D., Smith, Mb, Wadsworth, R., and Ward, D.

Subjects
Physical Sciences, Nuclear & Particles Physics, Mathematical Sciences
Published
2005

6. Nuclear structure research at TRIUMF

Author

Garrett, P. E., Andreyev, A., Austin, R. A. E., Ball, G. C., Bandyopadhyay, D., Becker, J. A., Boston, A. J., Chakrawarthy, R. S., Cline, D., Cooper, R. J., Churchman, R., Cross, D., Dashdorj, D., Demand, G. A., Dimmock, M. R., Drake, T. E., Finlay, P., Gagon-Miosan, F., Gallant, A. T., Green, K. L., Grint, A. N., Grinyer, G. F., Hackman, G., Harkness, L. J., Hayes, A. B., Kanungo, R., Kulp, W. D., Kyle Leach, Lee, G., Leslie, J. R., Martin, J. -P, Mattoon, C., Mills, W. J., Morton, A. C., Mythili, S., Nelson, L., Newman, O., Nolan, P. J., Padilla-Rodal, E., Pearson, C. J., Phillips, A. A., Porter-Peden, M., Ressler, J. J., Roy, R., Ruiz, C., Savajols, H., Sarazin, F., Schumaker, M. A., Scraggs, D. P., Scraggs, H. C., Strange, M. D., Svensson, C. E., Waddington, J. C., Wan, J. M., Whitbeck, A., Williams, S. J., Wong, J., Wood, J. L., Wu, C. Y., and Zganjar, E. F.

7. Superallowed beta decay studies at TRIUMF -nuclear structure and fundamental symmetries

Author

Zganjar, E. F., Achtzehn, T., Albers, D., Corina Andreoiu, Andreyev, A. N., Austin, R. A. E., Ball, G. C., Behr, J. A., Biosvert, G. C., Bricault, P., Bishop, S., Chakrawarthy, R. S., Churchman, R., Cross, D., Cunningham, E., D Auria, J. M., Dombsky, M., Finlay, P., Garrett, P. E., Grinyer, G. F., Hackman, G., Hanemaayer, V., Hardy, J. C., Hodgson, D. F., Hyland, B., Iacob, V., Klages, P., Kpmans, K. A., Kulp, W. D., Lassen, J., Lavoie, J. P., Leslie, J. R., Linder, T., Macdonald, J. A., Mak, H. -B, Melconian, D., Morton, A. C., Ormand, W. E., Osborne, C. J., Pearson, C. J., Pearson, M. R., Phillips, A. A., Piechaczek, A., Ressler, J., Sarazin, F., Savard, G., Schumaker, M. A., Scraggs, H. C., Svensson, C. E., Valiente-Dobon, J. J., Towner, I. S., Waddington, J. C., Walkers, P. M., Wendt, K., and Wood, J. L.

8. Lifetimes of high-spin states in76Kr

Author

Valiente-Dobón, J. J., Svensson, C. E., O Leary, C. D., Ragnarsson, I., Andreoiu, C., Austin, R. A. E., Carpenter, M. P., Dashdorj, D., Finlay, P., Freeman, S. J., Garrett, P. E., Görgen, A., Greene, J., Grinyer, G. F., Hyland, B., Jenkins, D., Johnston-Theasby, F., Joshi, P., Kelsall, N. S., Macchiavelli, A. O., Moore, F., Mukherjee, G., Phillips, A. A., Reviol, W., Sarantites, D., Schumaker, M. A., Seweryniak, D., Martin Smith, Wadsworth, R., and Ward, D.

Subjects
Physical Sciences, Nuclear & Particles Physics, Mathematical Sciences
Abstract

High-spin states in 3676Kr40 have been populated in the 40Ca(40Ca,4p)76Kr fusion-evaporation reaction at a beam energy of 165 MeV, and studied using the GAMMASPHERE and MICROBALL multi-detector arrays. The ground-state band and two signature-split negative-parity bands of 76Kr have been extended to ∼30hℏ. Lifetime measurements using the Doppler-shift attenuation method indicate that the transition quadrupole moment of these three bands decrease as they approach their maximum-spin states.

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