Measurement of the Neutrino Asymmetry Parameter<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>in Neutron Decay

Schümann, M.; Söldner, T.; Deissenroth, M.; Glück, F.; Krempel, J.; Kreuz, Michael; Märkisch, Bastian; Mund, D.; Petoukhov, A.; Abele, H.

doi:10.1103/physrevlett.99.191803

Cited by 61 publications

(55 citation statements)

References 27 publications

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“…This is to be compared to values ranging from 220 GeV/c 2 to 310 GeV/c 2 (90% C.L.) obtained from other experiments in nuclear and neutron β decay [77][78][79][80][81][82][83]. Constraints on the right-handed currents parameters δ and ζ from measurements of different observables in nuclear β decay, i.e.…”

Section: B Limits On Right-handed Currentsmentioning

confidence: 99%

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: B Limits On Right-handed Currentsmentioning

confidence: 99%

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

et al. 2010

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“…The two most precise results, i.e. B n = 0.9801 (46) [60,61] and B n = 0.9802(50) [62], dominate the world average value of B n = 0.9807 (30). …”

Section: Neutrino Asymmetry Parameter In Neutron Decaymentioning

confidence: 84%

Tests of P-violation in neutron and nuclear beta decay

Severijns

2011

Hyperfine Interact

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“…For these experiments, the use of a series of opaque spin filters (see Sec. VII.E.1) has been employed to determine neutron polarization to 0.1 % accuracy, thus substantially reducing this contribution to the overall uncertainty budget (Mund et al , 2013; Schumann et al , 2008, 2007). An NSF was also used to determine the neutron polarization in a measurement of the neutron electric dipole moment via spin rotation in a non-centrosymmetric crystal (Fedorov et al , 2010).…”

Section: Neutron Spin-filtersmentioning

confidence: 99%

Optically polarizedHe3

et al. 2017

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This article reviews the physics and technology of producing large quantities of highly spin-polarized 3He nuclei using spin-exchange (SEOP) and metastability-exchange (MEOP) optical pumping. Both technical developments and deeper understanding of the physical processes involved have led to substantial improvements in the capabilities of both methods. For SEOP, the use of spectrally narrowed lasers and K-Rb mixtures has substantially increased the achievable polarization and polarizing rate. For MEOP nearly lossless compression allows for rapid production of polarized 3He and operation in high magnetic fields has likewise significantly increased the pressure at which this method can be performed, and revealed new phenomena. Both methods have benefitted from development of storage methods that allow for spin-relaxation times of hundreds of hours, and specialized precision methods for polarimetry. SEOP and MEOP are now widely applied for spin-polarized targets, neutron spin filters, magnetic resonance imaging, and precision measurements.

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Measurement of the Neutrino Asymmetry ParameterBin Neutron Decay

Cited by 61 publications

References 27 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 P-violation in neutron and nuclear beta decay

Optically polarizedHe3

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