Production of Co-60 sources for high-accuracy efficiency calibrations of gamma-ray spectrometers

Schönfeld, E.; Janßen, H.; Klein, R.; Hardy, J.C.; Iacob, V. E.; Sanchez‐Vega, M.; Griffin, H. C.; Ludington, M. A.

doi:10.1016/s0969-8043(01)00191-9

Cited by 31 publications

(8 citation statements)

References 13 publications

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“…We then adopt the value, Ft = 3072.7 (8), which is the average result extracted from superallowed 0 + → 0 + beta decays when the correction terms are calculated by the same methods as those used here (see Eq. 11 in Ref.…”

Section: Discussionmentioning

confidence: 99%

Branching ratios for theβdecay ofNa21

et al. 2006

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We have measured the beta-decay branching ratio for the transition from 21 Na to the first excited state of 21 Ne. A recently published test of the standard model, which was based on a measurement of the β-ν correlation in the decay of 21 Na, depended on this branching ratio. However, until now only relatively imprecise (and, in some cases, contradictory) values existed for it. Our new result, 4.74(4)%, reduces but does not remove the reported discrepancy with the standard model.

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Section: Discussionmentioning

confidence: 99%

Branching ratios for theβdecay ofNa21

et al. 2006

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“…This was reported thoroughly a decade ago [7,8] [7]. Of crucial importance were two 60 Co sources specially prepared by the PhysikalischTechnische Bundesanstalt [9], with activities certified to ±0.06%. These sources were used to anchor our absolute efficiency calibration, with cascaded γ-ray transitions from the other sources providing precise links over a wide range of energies.…”

Section: Efficiency Calibrationsmentioning

confidence: 99%

Precise measurement of branching ratios in theβdecay ofCa38

et al. 2015

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We present the full description of a measurement of the branching ratios for the β-decay of 38 Ca. This decay includes five allowed 0 + → 1 + branches and a superallowed 0 + → 0 + one. With our new result for the latter, we determine its f t value to be 3062.3±6.8 s, a result whose precision (0.2%) is comparable to the precision of the thirteen well known 0 + → 0 + transitions used up till now for the determination of V ud , the up-down quark-mixing element of the CKM matrix. The 38 Ca superallowed transition thus becomes the first addition to this set of transitions in nearly a decade and the first for which a precise mirror comparison is possible, thus enabling an improved test of the isospin-symmetry-breaking corrections required for the extraction of V ud .

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“…This was reported thoroughly more than a decade ago [11,12]. Initially [11], we used 10 different radionuclides with accurately known relative photon emission rates together with two 60 Co sources specially prepared by the Physikalisch-Technische Bundesanstalt [13], having activities certified to ±0.06%. The 60 Co sources were used to anchor our absolute efficiency calibration, with cascaded γ-ray transitions from the other sources providing precise links covering an energy range from 22 to 1836 keV.…”

Section: Efficiency Calibrationsmentioning

confidence: 99%

Precise β branching-ratio measurement for the 0+→0+ superallowed decay of Ar
Iacob
¹
,
Hardy
²
,
Park
³

et al. 2020
Phys. Rev. C
4
0
0
0
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We have measured the branching ratio for the superallowed 0 + → 0 + β transition from 34 Ar to be 0.9448(8), and determined its f t value to be 3058.1(28) s, a result with ±0.09% precision, which is a factor of three improvement over the previous result based on current world data. The f t-value ratio for the mirror pair of superallowed transitions 34 Ar → 34 Cl and 34 Cl → 34 S, becomes the most precise yet measured and, in a sensitive test of the method used to calculate the isospin-symmetry-breaking correction, δC , it agrees well with the ratio as calculated with Woods-Saxon radial wave functions. This confirms the method used in the most recent survey of superallowed decays to extract V ud , the up-down quark-mixing element of the Cabibbo-Kobayashi-Maskawa matrix. In addition, our branching-ratio results for the four observed Gamow-Teller branches to 1 + states in 34 Cl are shown to agree well with shell-model calculations based on the same effective interactions that were used in the determination of δC .

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Production of Co-60 sources for high-accuracy efficiency calibrations of gamma-ray spectrometers

Cited by 31 publications

References 13 publications

Branching ratios for theβdecay ofNa21

Branching ratios for theβdecay ofNa21

Precise measurement of branching ratios in theβdecay ofCa38

Precise β branching-ratio measurement for the 0+→0+ superallowed decay of Ar
Iacob
¹
,
Hardy
²
,
Park
³

et al. 2020
Phys. Rev. C
4
0
0
0
View full text Add to dashboard Cite

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Production of Co-60 sources for high-accuracy efficiency calibrations of gamma-ray spectrometers

Cited by 31 publications

References 13 publications

Branching ratios for theβdecay ofNa21

Branching ratios for theβdecay ofNa21

Precise measurement of branching ratios in theβdecay ofCa38

Precise β branching-ratio measurement for the 0+→0+ superallowed decay of ArIacob1, Hardy2, Park3 et al. 2020Phys. Rev. C4000View full textAdd to dashboardCite

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Precise β branching-ratio measurement for the 0+→0+ superallowed decay of Ar
Iacob
¹
,
Hardy
²
,
Park
³

et al. 2020
Phys. Rev. C
4
0
0
0
View full text Add to dashboard Cite