Simultaneous measurement of beta- decay to bound and continuum electron states.
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.
Ohtsubo
T
T
Gesellschaft für Schwerionenforschung (GSI), 64291 Darmstadt, Germany.
Bosch
F
F
Geissel
H
H
Maier
L
L
Scheidenberger
C
C
Attallah
F
F
Beckert
K
K
Beller
P
P
Boutin
D
D
Faestermann
T
T
Franczak
B
B
Franzke
B
B
Hausmann
M
M
Hellström
M
M
Kaza
E
E
Kienle
P
P
Klepper
O
O
Kluge
H-J
HJ
Kozhuharov
C
C
Litvinov
Yu A
YA
Matos
M
M
Münzenberg
G
G
Nolden
F
F
Novikov
Yu N
YN
Portillo
M
M
Radon
T
T
Stadlmann
J
J
Steck
M
M
Stöhlker
T
T
Sümmerer
K
K
Takahashi
K
K
Weick
H
H
Winkler
M
M
Yamaguchi
T
T