Abstract:Large amplitude roll waves are incorporated into a previously developed slug tracking scheme for two phase gas-liquid pipe flow. The applicability of the tracking scheme to large amplitude waves is demonstrated with a simplified model for the waves. The waves are modelled analogous to slugs on a moving grid with corresponding wave velocities and a pressure variation determined using an orifice type relation. Slugs and waves in the tracking scheme are separated by regions of stratified flow, which are modelled … Show more
“…Holstein also provided expressions for the Coulomb corrections to the spectral functions, which are noted as ∆F [52]. Furthermore, including the radiative corrections (∆R 2 and ∆R 3 ) as defined by Yokoo and Morita [53], the β-asymmetry parameter can be written as [54]:…”
Background: Precision measurements at low energy search for physics beyond the Standard Model in a way complementary to searches for new particles at colliders. In the weak sector the most general β decay Hamiltonian contains, besides vector and axial-vector terms, also scalar, tensor and pseudoscalar terms. Current limits on the scalar and tensor coupling constants from neutron and nuclear β decay are on the level of several percent.Purpose: Extracting new information on tensor coupling constants by measuring the β-asymmetry parameter in the pure Gamow-Teller decay of 67 Cu, thereby testing the V-A structure of the weak interaction.
“…Holstein also provided expressions for the Coulomb corrections to the spectral functions, which are noted as ∆F [52]. Furthermore, including the radiative corrections (∆R 2 and ∆R 3 ) as defined by Yokoo and Morita [53], the β-asymmetry parameter can be written as [54]:…”
Background: Precision measurements at low energy search for physics beyond the Standard Model in a way complementary to searches for new particles at colliders. In the weak sector the most general β decay Hamiltonian contains, besides vector and axial-vector terms, also scalar, tensor and pseudoscalar terms. Current limits on the scalar and tensor coupling constants from neutron and nuclear β decay are on the level of several percent.Purpose: Extracting new information on tensor coupling constants by measuring the β-asymmetry parameter in the pure Gamow-Teller decay of 67 Cu, thereby testing the V-A structure of the weak interaction.
“…[29,30]) we estimate b/Ac = 4.6 ± 2.7 and d/Ac = ±(1.2 ± 1.2) with A here being the mass of the nucleus and c the GT form factor [28]. One then calculates a recoil correction of −0.0041 (30) which leads to A = -0.994 ± 0.010(stat) ± 0.010(syst). weighted average -0.990 (10) Being in agreement with the Standard Model value A β − SM = −1 this result can now be used to constrain physics beyond.…”
mentioning
confidence: 96%
“…Further, from systematics (see e.g. [29,30]) we estimate b/Ac = 4.6 ± 2.7 and d/Ac = ±(1.2 ± 1.2) with A here being the mass of the nucleus and c the GT form factor [28]. One then calculates a recoil correction of −0.0041 (30) which leads to A = -0.994 ± 0.010(stat) ± 0.010(syst).…”
The β asymmetry parameter A for the pure Gamow-Teller decay of 114 In is reported. The low temperature nuclear orientation method was combined with a GEANT4 based simulation code allowing for the first time to address in detail the effects of scattering and of the magnetic field. The result, A = -0.994 ± 0.010 stat ± 0.010 syst , constitutes the most accurate value for the asymmetry parameter of a nuclear β transition to date. The value is in agreement with the Standard Model prediction of A = -1 and provides new limits on tensor type charged weak currents.
“…radiative corrections, are well understood and can be calculated to good precision, weak magnetism has until now only been studied for a number of low-mass (i.e. up to A = 30) isotopes [73] and additional information is more than welcome. As the weak magnetism term is proportional to E β , transitions with high endpoint energy are preferred.…”
Precision measurements of observables in nuclear beta decay continue to provide important information on the structure and symmetries of the weak interaction. In this review the main focus is on the status and prospects of such measurements at radioactive ion beam facilities, often using atom or ion traps, in the era of the Large Hadron Collider. With the precision of these measurements reaching the per mil level small Standard Model effects now have to be included as well. The understanding of some of these requires additional measurements be performed in order to maintain optimal sensitivity to weak interaction properties.
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