Meson exchange currents in first forbidden beta decay in the lead region

0185025 - UJF-V 20000195 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Versyck, S. - Beck, M. - Beck, D. - Delauré, B. - de Moor, P. - Feyaerts, T. - Herzog, P. - Knipper, A. - Phalet, T. - Prandolini, M. J. - Schuurmans, P. - Severijns, N. - Sevenich, P. - Srnka, Dušan - Van Geert, A. - Vénos, Drahoslav - Verecke, B. - Walter, G. - Will, B. - Zákoucký, Dalibor
Meson exchange currents in first forbidden beta decay in the lead region.
Workshop on the Beta Decay, from Weak Interaction to Nuclear Structure. Strasbourg: Institut de Recherches Subatomiques, 1999 - (Dessagne, P.; Michalon, A.; Miehé, C.), s. 22-29
[Workshop on the Beta Decay, from Weak Interaction to Nuclear Structure. Strasbourg (FR), 17.03.1999-19.03.1999]
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače

Due to meson exchange currents (MEC) the time-like component of the weak axial vector current is enhanced with respectto the impulse approximation. This Enhancement can be observed in the first-forbidden beta decay matrix element fç.sup.5.For several transitions in the lead region the MEC-enhancement factor îMEC of this matrix element was determined by measuring the beta asymmetry and combining this with the known experimental ft value. To obtain the beta asymmetry on-line low-temperature nuclear orientation measurements were performedboth at the ISOLDE (CERN) and the LISOL (Louvain-la-Neuve) mass separator facilities. The lead region nuclei under studyare .sub.205 Hg, .sub.207 Tl and .sub.213 Bi.
Trvalý link: http://hdl.handle.net/11104/0081449