Simultaneous measurement of beta- decay to bound and continuum electron states.

作者信息

Ohtsubo T, Bosch F, Geissel H, Maier L, Scheidenberger C, Attallah F, Beckert K, Beller P, Boutin D, Faestermann T, Franczak B, Franzke B, Hausmann M, Hellström M, Kaza E, Kienle P, Klepper O, Kluge H-J, Kozhuharov C, Litvinov Yu A, Matos M, Münzenberg G, Nolden F, Novikov Yu N, Portillo M, Radon T, Stadlmann J, Steck M, Stöhlker T, Sümmerer K, Takahashi K, Weick H, Winkler M, Yamaguchi T

机构信息

Gesellschaft für Schwerionenforschung (GSI), 64291 Darmstadt, Germany.

出版信息

Phys Rev Lett. 2005 Jul 29;95(5):052501. doi: 10.1103/PhysRevLett.95.052501. Epub 2005 Jul 25.

DOI:10.1103/PhysRevLett.95.052501

PMID:16090870

Abstract

We report the first measurement of a ratio lambda(beta(b))/lambda(beta(c)) of bound-state ((lambda(beta(b))) and continuum-state (lambda(beta(c))) beta(-)-decay rates for the case of bare 207Tl81+ ions. These ions were produced at the GSI fragment separator FRS by projectile fragmentation of a 208Pb beam. After in-flight separation with the Brho-deltaE-Brho method, they were injected into the experimental storage-ring ESR at an energy of 400.5A MeV, stored, and electron cooled. The number of both the 207Tl81+ ions and their bound-state beta(-)-decay daughters, hydrogen-like 207Pb81+ ions, were measured as a function of storage time by recording their Schottky-noise intensities. The experimental result, lambda(beta(b))/lambda(beta(c)) = 0.188(18), is in very good agreement with the value of 0.171(1) obtained from theory employing spectra of allowed transitions.

摘要