Nuclear orientation facility for the study of the angular distribution of γ radiation and β particles emitted by polarized nuclei

Chirovsky, L. M. F.; Lee, Wen-Piao; Sabbas, Albert; Becker, A.; Groves, J.L.; Wu, Chenye

doi:10.1016/0167-5087(84)90140-6

Cited by 17 publications

(21 citation statements)

References 24 publications

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“…(10). Our result is comparable to the value previously obtained by Chirovsky et al, of −1.01(2) [26]. When investigating the report on their measurement in more detail, we recognize these authors' efforts to reduce all sources of systematic errors.…”

Section: Discussionsupporting

confidence: 79%

“…For the most precise measurements to date with 60 Co [26] and 114 In [9], accuracies of 2 % and 1.5 % have been obtained. To improve significantly on the existing constraints for a tensor-type weak interaction the β-asymmetry parameter has to be determined with a precision of at least this order or even better, depending on the isotope in question and its β endpoint energy, see Eq.…”

Section: Introductionmentioning

confidence: 99%

“…An excellent illustration of the potential of this method is the well-known experiment performed in 1957 with 60 Co by C. S. Wu et al, which established the violation of parity in weak interactions [25]. This experiment was later repeated with better precision by Chirovsky et al [26]. Table I summarizes the most precise β-asymmetry measurements for superallowed mixed Fermi/Gamow-Teller and pure GamowTeller (GT) nuclear β decays.…”

Section: Introductionmentioning

confidence: 99%

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Precision measurements of theCo60β-asymmetry parameter in search for tensor currents in weak interactions

et al. 2010

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The β-asymmetry parameter A for the Gamow-Teller decay of 60 Co was measured by polarizing the radioactive nuclei with the brute force low-temperature nuclear-orientation method. The 60 Co activity was cooled down to milliKelvin temperatures in a 3 He-4 He dilution refrigerator in an external 13 T magnetic field. The β particles were observed by a 500 µm thick Si PIN diode operating at a temperature of about 10 K in a magnetic field of 0.6 T. Extensive GEANT4 Monte-Carlo simulations were performed to gain control over the systematic effects. Our result, A = −1.014 (12)stat (16)syst, is in agreement with the Standard-Model value of −0.987(9), which includes recoil-order corrections that were addressed for the first time for this isotope. Further, it enables limits to be placed on possible tensor-type charged weak currents as well as other physics beyond the Standard Model.

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Section: Discussionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Precision measurements of theCo60β-asymmetry parameter in search for tensor currents in weak interactions

et al. 2010

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“…Twenty years later this experiment was repeated with a more advanced set-up where the nuclear polarization could be rotated using two crossed magnetic coils, yielding A = −1.01(2) (Chirovsky et al, 1984(Chirovsky et al, , 1980. Using Eq.…”

Section: Beta-asymmetry Parametermentioning

confidence: 99%

Tests of the standard electroweak model in nuclear beta decay

2006

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We review the current status of precision measurements in allowed nuclear beta decay, including neutron decay, with emphasis on their potential to look for new physics beyond the standard electroweak model. The experimental results are interpreted in the framework of phenomenological model-independent descriptions of nuclear beta decay as well as in some specific extensions of the standard model. The values of the standard couplings and the constraints on the exotic couplings of the general beta decay Hamiltonian are updated. For the ratio between the axial and the vector couplings we obtain C A /C V = −1.26992(69) under the standard model assumptions. Particular attention is devoted to the discussion of the sensitivity and complementarity of different precision experiments in direct beta decay. The prospects and the impact of recent developments of precision tools and of high intensity low energy beams are also addressed.

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“…It is easy to see from this expression that theX-prescription will then apply not only for standard asymmetries, but also for measurements of the θ differential distribution [28]. However, the recoil momentum r and the β-particle energy W are not independent.…”

Section: Correlation Coefficientsmentioning

confidence: 99%

Kinematic sensitivity to the Fierz term ofβ-decay differential spectra

González–Alonso

Naviliat‐Cuncic

2016

Phys. Rev. C

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The current most stringent constraints on exotic scalar or tensor couplings in neutron and nuclear β decay, involving left-handed neutrinos, are obtained from the Fierz interference term. The sensitivity to this term in a correlation coefficient is usually driven by an energy-averaged kinematic factor that increases monotonically toward smaller values of the β endpoint energies. We first point out here that this property does not hold for certain differential observables that are directly sensitive to the Fierz term, such as the β or the recoil energy spectrum. This observation is relevant for the selection of sensitive transitions in searches for exotic couplings through spectrum shape measurements. We then point out previous errors in the exploitation of measurements of the β − ν angular correlation coefficient and discuss their impact on the extraction of constraints on exotic couplings.

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Nuclear orientation facility for the study of the angular distribution of γ radiation and β particles emitted by polarized nuclei

Cited by 17 publications

References 24 publications

Precision measurements of theCo60β-asymmetry parameter in search for tensor currents in weak interactions

Precision measurements of theCo60β-asymmetry parameter in search for tensor currents in weak interactions

Tests of the standard electroweak model in nuclear beta decay

Kinematic sensitivity to the Fierz term ofβ-decay differential spectra

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