Superallowed beta decay studies at TRIUMF - Nuclear structure and fundamental symmetries

E. F. Zganjar; T. Achtzehn; D. Albers; C. Andreoiu; A. N. Andreyev; R. A. E. Austin; G. C. Ball; J. A. Behr; G. C. Biosvert; P. Bricault; S. Bishop; R. S. Chakrawarthy; R. Churchman; D. Cross; E. Cunningham; J. M. D'Auria; M. Dombsky; P. Finlay; P. E. Garrett; G. F. Grinyer; G. Hackman; V. Hanemaayer; J. C. Hardy; D. F. Hodgson; B. Hyland; V. Iacob; P. Klages; K. A. Koopmans; W. D. Kulp; J. Lassen; J. P. Lavoie; J. R. Leslie; T. Linder; J. A. Macdonald; H-B Mak; D. Melconian; A. C. Morton; W. E. Ormand; C. J. Osborne; C. J. Pearson; M. R. Pearson; A. A. Phillips; A. Piechaczek; J. Ressler; F. Sarazin; G. Savard; M. A. Schumaker; H. C. Scraggs; C. E. Svensson; J. J. Valiente-Dobon; I. S. Towner; J. C. Waddington; P. M. Walker; K. Wendt; J. L. Wood

Superallowed beta decay studies at TRIUMF - Nuclear structure and fundamental symmetries

E. F. Zganjar^*, T. Achtzehn, D. Albers, C. Andreoiu, A. N. Andreyev, R. A. E. Austin, G. C. Ball, J. A. Behr, G. C. Biosvert, P. Bricault, S. Bishop, R. S. Chakrawarthy, R. Churchman, D. Cross, E. Cunningham, J. M. D'Auria, M. Dombsky, P. Finlay, P. E. Garrett, G. F. GrinyerG. Hackman, V. Hanemaayer, J. C. Hardy, D. F. Hodgson, B. Hyland, V. Iacob, P. Klages, K. A. Koopmans, W. D. Kulp, J. Lassen, J. P. Lavoie, J. R. Leslie, T. Linder, J. A. Macdonald, H-B Mak, D. Melconian, A. C. Morton, W. E. Ormand, C. J. Osborne, C. J. Pearson, M. R. Pearson, A. A. Phillips, A. Piechaczek, J. Ressler, F. Sarazin, G. Savard, M. A. Schumaker, H. C. Scraggs, C. E. Svensson, J. J. Valiente-Dobon, I. S. Towner, J. C. Waddington, P. M. Walker, K. Wendt, J. L. Wood

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

Precision measurement of the beta-decay half-life, Q-value, and branching ratio between nuclear analog states of J(pi) = 0(+) and T = 1 can provide critical and fundamental tests of the Standard Model's description of electroweak interactions. A program has been initiated at TRIUMF-ISAC to measure the ft values of these superallowed beta transitions. Two T. = 0, A > 60 cases, Rb-74 and Ca-62, are presented. These are particularly relevant because they can provide critical tests of the calculated nuclear structure and isospin-symmetry breaking corrections that are predicted to be larger for heavier nuclei, and because they demonstrate the advance in the experimental precision on ft at TRIUMF-ISAC from 0.26% for Rb-74 in 2002 to 0.05% for Ga-62 in 2006. The high precision world data on experimental f t and corrected Ft values are discussed and shown to be consistent with CVC at the 10(-4) level, yielding an average Ft = 3073.70(74) s. This Ft leads to V-ud = 0.9737(4) for the up-down element of the Standard Model's CKM matrix. With this value and the Particle Data Group's 2006 values for V-us and V-ub, the unitarity condition for the CKM matrix is met. Additional measurements and calculations are needed, however, to reduce the uncertainties in that evaluation. That objective is the focus of the continuing program on superallowed-beta decay at TRIUMF-ISAC.

Original language	English
Pages (from-to)	1179-1194
Number of pages	16
Journal	Acta Physica Polonica B
Volume	38
Issue number	4
Publication status	Published - Apr 2007
Event	41st Zakopane Conference on Nuclear Physics - Zakopane, Poland Duration: 4 Sept 2006 → 10 Sept 2006

Keywords

HALF-LIFE MEASUREMENT
RB-74
GA-62
PRECISION
PARTICLE PHYSICS
ISAC

Cite this

Zganjar, E. F., Achtzehn, T., Albers, D., Andreoiu, C., 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., ... Wood, J. L. (2007). Superallowed beta decay studies at TRIUMF - Nuclear structure and fundamental symmetries. Acta Physica Polonica B, 38(4), 1179-1194.

@article{cf7433c288cc414aa48aa0c7637ec5c3,

title = "Superallowed beta decay studies at TRIUMF - Nuclear structure and fundamental symmetries",

abstract = "Precision measurement of the beta-decay half-life, Q-value, and branching ratio between nuclear analog states of J(pi) = 0(+) and T = 1 can provide critical and fundamental tests of the Standard Model's description of electroweak interactions. A program has been initiated at TRIUMF-ISAC to measure the ft values of these superallowed beta transitions. Two T. = 0, A > 60 cases, Rb-74 and Ca-62, are presented. These are particularly relevant because they can provide critical tests of the calculated nuclear structure and isospin-symmetry breaking corrections that are predicted to be larger for heavier nuclei, and because they demonstrate the advance in the experimental precision on ft at TRIUMF-ISAC from 0.26% for Rb-74 in 2002 to 0.05% for Ga-62 in 2006. The high precision world data on experimental f t and corrected Ft values are discussed and shown to be consistent with CVC at the 10(-4) level, yielding an average Ft = 3073.70(74) s. This Ft leads to V-ud = 0.9737(4) for the up-down element of the Standard Model's CKM matrix. With this value and the Particle Data Group's 2006 values for V-us and V-ub, the unitarity condition for the CKM matrix is met. Additional measurements and calculations are needed, however, to reduce the uncertainties in that evaluation. That objective is the focus of the continuing program on superallowed-beta decay at TRIUMF-ISAC.",

keywords = "HALF-LIFE MEASUREMENT, RB-74, GA-62, PRECISION, PARTICLE PHYSICS, ISAC",

author = "Zganjar, {E. F.} and T. Achtzehn and D. Albers and C. Andreoiu and Andreyev, {A. N.} and Austin, {R. A. E.} and Ball, {G. C.} and Behr, {J. A.} and Biosvert, {G. C.} and P. Bricault and S. Bishop and Chakrawarthy, {R. S.} and R. Churchman and D. Cross and E. Cunningham and D'Auria, {J. M.} and M. Dombsky and P. Finlay and Garrett, {P. E.} and Grinyer, {G. F.} and G. Hackman and V. Hanemaayer and Hardy, {J. C.} and Hodgson, {D. F.} and B. Hyland and V. Iacob and P. Klages and Koopmans, {K. A.} and Kulp, {W. D.} and J. Lassen and Lavoie, {J. P.} and Leslie, {J. R.} and T. Linder and Macdonald, {J. A.} and H-B Mak and D. Melconian and Morton, {A. C.} and Ormand, {W. E.} and Osborne, {C. J.} and Pearson, {C. J.} and Pearson, {M. R.} and Phillips, {A. A.} and A. Piechaczek and J. Ressler and F. Sarazin and G. Savard and Schumaker, {M. A.} and Scraggs, {H. C.} and Svensson, {C. E.} and Valiente-Dobon, {J. J.} and Towner, {I. S.} and Waddington, {J. C.} and Walker, {P. M.} and K. Wendt and Wood, {J. L.}",

year = "2007",

month = apr,

language = "English",

volume = "38",

pages = "1179--1194",

journal = "Acta Physica Polonica B",

issn = "0587-4254",

publisher = "Jagellonian University",

number = "4",

note = "41st Zakopane Conference on Nuclear Physics ; Conference date: 04-09-2006 Through 10-09-2006",

}

Zganjar, EF, Achtzehn, T, Albers, D, Andreoiu, C, Andreyev, AN, Austin, RAE, Ball, GC, Behr, JA, Biosvert, GC, Bricault, P, Bishop, S, Chakrawarthy, RS, Churchman, R, Cross, D, Cunningham, E, D'Auria, JM, Dombsky, M, Finlay, P, Garrett, PE, Grinyer, GF, Hackman, G, Hanemaayer, V, Hardy, JC, Hodgson, DF, Hyland, B, Iacob, V, Klages, P, Koopmans, KA, Kulp, WD, Lassen, J, Lavoie, JP, Leslie, JR, Linder, T, Macdonald, JA, Mak, H-B, Melconian, D, Morton, AC, Ormand, WE, Osborne, CJ, Pearson, CJ, Pearson, MR, Phillips, AA, Piechaczek, A, Ressler, J, Sarazin, F, Savard, G, Schumaker, MA, Scraggs, HC, Svensson, CE, Valiente-Dobon, JJ, Towner, IS, Waddington, JC, Walker, PM, Wendt, K & Wood, JL 2007, 'Superallowed beta decay studies at TRIUMF - Nuclear structure and fundamental symmetries', Acta Physica Polonica B, vol. 38, no. 4, pp. 1179-1194.

TY - JOUR

T1 - Superallowed beta decay studies at TRIUMF - Nuclear structure and fundamental symmetries

AU - Zganjar, E. F.

AU - Achtzehn, T.

AU - Albers, D.

AU - Andreoiu, C.

AU - Andreyev, A. N.

AU - Austin, R. A. E.

AU - Ball, G. C.

AU - Behr, J. A.

AU - Biosvert, G. C.

AU - Bricault, P.

AU - Bishop, S.

AU - Chakrawarthy, R. S.

AU - Churchman, R.

AU - Cross, D.

AU - Cunningham, E.

AU - D'Auria, J. M.

AU - Dombsky, M.

AU - Finlay, P.

AU - Garrett, P. E.

AU - Grinyer, G. F.

AU - Hackman, G.

AU - Hanemaayer, V.

AU - Hardy, J. C.

AU - Hodgson, D. F.

AU - Hyland, B.

AU - Iacob, V.

AU - Klages, P.

AU - Koopmans, K. A.

AU - Kulp, W. D.

AU - Lassen, J.

AU - Lavoie, J. P.

AU - Leslie, J. R.

AU - Linder, T.

AU - Macdonald, J. A.

AU - Mak, H-B

AU - Melconian, D.

AU - Morton, A. C.

AU - Ormand, W. E.

AU - Osborne, C. J.

AU - Pearson, C. J.

AU - Pearson, M. R.

AU - Phillips, A. A.

AU - Piechaczek, A.

AU - Ressler, J.

AU - Sarazin, F.

AU - Savard, G.

AU - Schumaker, M. A.

AU - Scraggs, H. C.

AU - Svensson, C. E.

AU - Valiente-Dobon, J. J.

AU - Towner, I. S.

AU - Waddington, J. C.

AU - Walker, P. M.

AU - Wendt, K.

AU - Wood, J. L.

PY - 2007/4

Y1 - 2007/4

N2 - Precision measurement of the beta-decay half-life, Q-value, and branching ratio between nuclear analog states of J(pi) = 0(+) and T = 1 can provide critical and fundamental tests of the Standard Model's description of electroweak interactions. A program has been initiated at TRIUMF-ISAC to measure the ft values of these superallowed beta transitions. Two T. = 0, A > 60 cases, Rb-74 and Ca-62, are presented. These are particularly relevant because they can provide critical tests of the calculated nuclear structure and isospin-symmetry breaking corrections that are predicted to be larger for heavier nuclei, and because they demonstrate the advance in the experimental precision on ft at TRIUMF-ISAC from 0.26% for Rb-74 in 2002 to 0.05% for Ga-62 in 2006. The high precision world data on experimental f t and corrected Ft values are discussed and shown to be consistent with CVC at the 10(-4) level, yielding an average Ft = 3073.70(74) s. This Ft leads to V-ud = 0.9737(4) for the up-down element of the Standard Model's CKM matrix. With this value and the Particle Data Group's 2006 values for V-us and V-ub, the unitarity condition for the CKM matrix is met. Additional measurements and calculations are needed, however, to reduce the uncertainties in that evaluation. That objective is the focus of the continuing program on superallowed-beta decay at TRIUMF-ISAC.

AB - Precision measurement of the beta-decay half-life, Q-value, and branching ratio between nuclear analog states of J(pi) = 0(+) and T = 1 can provide critical and fundamental tests of the Standard Model's description of electroweak interactions. A program has been initiated at TRIUMF-ISAC to measure the ft values of these superallowed beta transitions. Two T. = 0, A > 60 cases, Rb-74 and Ca-62, are presented. These are particularly relevant because they can provide critical tests of the calculated nuclear structure and isospin-symmetry breaking corrections that are predicted to be larger for heavier nuclei, and because they demonstrate the advance in the experimental precision on ft at TRIUMF-ISAC from 0.26% for Rb-74 in 2002 to 0.05% for Ga-62 in 2006. The high precision world data on experimental f t and corrected Ft values are discussed and shown to be consistent with CVC at the 10(-4) level, yielding an average Ft = 3073.70(74) s. This Ft leads to V-ud = 0.9737(4) for the up-down element of the Standard Model's CKM matrix. With this value and the Particle Data Group's 2006 values for V-us and V-ub, the unitarity condition for the CKM matrix is met. Additional measurements and calculations are needed, however, to reduce the uncertainties in that evaluation. That objective is the focus of the continuing program on superallowed-beta decay at TRIUMF-ISAC.

KW - HALF-LIFE MEASUREMENT

KW - RB-74

KW - GA-62

KW - PRECISION

KW - PARTICLE PHYSICS

KW - ISAC

M3 - Article

SN - 0587-4254

VL - 38

SP - 1179

EP - 1194

JO - Acta Physica Polonica B

JF - Acta Physica Polonica B

IS - 4

T2 - 41st Zakopane Conference on Nuclear Physics

Y2 - 4 September 2006 through 10 September 2006

ER -