Polarisation circulaire du rayonnement gamma De 58Co, 48V, 52Mn et 56Co

Pingot, O.

doi:10.1016/0375-9474(71)90411-8

Cited by 21 publications

(3 citation statements)

References 29 publications

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“…Our final result for 56 Co is y =-0.091 ± 0.005 where the error listed includes all the sources considered. Except for the early NO measurement 4 and the deviant CP measurement, 10 our value for v is in reasonable agreement with previous CP measurements. Thus, the NO and CP experimental methods give consistent results.…”

Section: Secsupporting

confidence: 91%

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Fermi-Gamow-Teller Mixing in the Allowed Isospin-Hindered Positron Decay ofCo56

et al. 1982

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calculated effective decay lengths agree within about 0.2 mm. Variations of the above control sample were also studied. Considering the consistency of all the data for both T and control events we have assigned a systematic uncertainty of 0.3 mm to the decay path measurement.Taking the T mass to be 3 1.782 GeV, and the average beam energy for this experiment of 14.5 GeV, we find for the lifetime T T =(4.9±2.0)X10" 13 sec.A new high-precision measurement of the asymmetry coefficient, A$ 9 for the positron decay of polarized 56 Co is reported: A^ = + 0.359± 0.009. If one assumes the V-A form of the weak interaction and time-reversal invariance, the Fermi-Gamow-Teller mixing ratio, y = C V M ¥ /C A M GT9 is then -0.091 ± 0.005. Since y is nonzero and isospin is not conserved, 56 Co (3 + decay is a good candidate for sensitive time-reversal invariance tests of the weak interaction.

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Section: Secsupporting

confidence: 91%

“…4 and Pingot. 10 The results reported by Ambler etal. 4 were from a very early measurement of A a for 56 Co that used adiabatic demagnetization for cooling.…”

Section: Secmentioning

confidence: 91%

Fermi-Gamow-Teller Mixing in the Allowed Isospin-Hindered Positron Decay ofCo56

et al. 1982

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“…Since 1956, fourteen measurements [4][5][6][7][8][9][10][11][12][13][14][15][16][17] have been made on the asymmetry coefficient A for 0 + of the 58 Co 58 Fe decay with a view to obtaining y. However, such measurements by either polarized nuclei or jS-y circular polarization correlations in unpolarized nuclei are difficult, and different workers tend to obtain rather different values.…”

Section: Introductionmentioning

confidence: 99%

Vanishing Fermi to Gamow-Teller Mixing Ratio of the ß⁺ Decay of ⁵⁸Co

Saw

Yap

1990

Zeitschrift Für Naturforschung A

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Since 1956, fourteen experimentally-deduced values of the Fermi to Gamow-Teller mixing ratio y = CvMF/CAMGT were published, varying from 0.05 to -0.36 with most values consistent with y = 0, particularly those from recent measurements. Our calculation, using the Nilsson model, yields y= 2.07 x 10-4, which can be taken as zero. Our result is therefore consistent with time-reversal invariance. Furthermore, the vanishing value of y arises both from the ΔT selection rule and the ΔK selection rule

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