Scalar current limit from the beta-neutrino correlation: the WISArD experiment
Language
en
Communication dans un congrès
This item was published in
J.Phys.Conf.Ser., J.Phys.Conf.Ser., 2019-01-07, Cocoyoc. 2019, vol. 1308, n° 1, p. 012003
English Abstract
Beta - neutrino correlation measurements are key in the research of physics beyond the Standard Model. In pure Fermi beta transitions, the beta-neutrino correlation coefficient, a βν, is sensitive to the presence of scalar ...Read more >
Beta - neutrino correlation measurements are key in the research of physics beyond the Standard Model. In pure Fermi beta transitions, the beta-neutrino correlation coefficient, a βν, is sensitive to the presence of scalar currents. The present limits were established by experimental studies of various nuclear systems with allowed Fermi transitions. A new experiment to improve the constraints on scalar currents is being developed, by the WISArD collaboration at ISOLDE/CERN, where the aim is to measure the energy shift of the β-delayed protons emitted from the isobaric analogue state of the 32Ar ground state. To enhance the sensitivity, protons and positrons are guided by a strong magnetic field and measured in coincidence between the two detection configurations located on both sides of a catcher foil in which the radioactive samples are implanted. Kinematic energy shifts of the protons in coincidence with positrons, in the same or opposite hemisphere of the catcher foil, will be more or less pronounced as a function of the possible scalar current component of the weak interaction. Details of the apparatus and preliminary results of the experiment are presented.Read less <
English Keywords
nucleus: semileptonic decay
neutrino: interaction
current: scalar
magnetic field: high
radioactivity
weak interaction
sensitivity
CERN Lab
numerical calculations
new physics
Origin
Hal imported