30 research outputs found
Etude des Ă©tats excitĂ©s 2+ de noyaux pairs-pairs peuplĂ©s par des transitions BĂȘta. Effet de l'environnement atomique sur la corrĂ©lation directionnelle BĂȘta-Gamma.
Docteur en Sciences -- Université catholique de Louvain, 196
Optimization of the Recoil-direction-sensitive Target for Muon-capture
The optimal thickness of layers composing nucleus-recoil-sensitive target that enables the measurement of a particular orientation parameter of the final nuclei B-12(gs)(I = 1(+)) and N-16(gs)(I = 2(-)) in the reactions mu(-) + C-12(0(+)) --> upsilon(mu) + B-12(gs)(I = 1(+)) and mu(-) + O-16(0(+)) --> upsilon(mu) + N-16(gs)(I = 2(-)) is estimated according to the current status of art of the slowing down of low energy (recoil energy of B-12 is 376 keV and that of N-16 is 300 keV) charged particles in matter. The choice of materials for orientation preserving (Ni, Ag, Rh) and for orientation-destroying (Al) layers which sandwich the production target layer C or BeO is based on the data obtained with polarized B-12 and N-13 radioactive nuclei beams at the Universite Catholique de Louvain
Comparison of the /sup 16/N/sup m/(O/sup -/) beta -decay rate with the inverse muon-capture rate: the induced pseudoscalar form factor in nuclei
An experiment to measure the rate lambda /sub beta / of the weak decay /sup 16/N/sup m/(O/sup -/, 120 keV) rarr /sup 16/O(O/sup +/, g.s.)+ beta /sup -/+ nu macr is described. The results are combined with the rate lambda /sub mu / for the inverse reaction mu /sup -/+/sup 16/O(O/sup +/, g.s.) rarr /sup 16/N /sup m/(O/sup -/, 120 keV)+ nu mu to yield a value for g/sub p/ the inverse-pseudoscalar form factor. The result suggests an upward renormalisation.Anglai
Macroscopic polarization signals with stopped muons
The authors point out the merits of macroscopic polarization signals known as Hanle signals, generated with stopped polarized muons.Anglai