DOI: 10.1140/epja/i2001-10251-7
Decay studies of
nuclei from
to
T. Faestermann1, R. Schneider1, A. Stolz1, K. Sümmerer2, E. Wefers1, J. Friese1, H. Geissel2, M. Hellström2, 3, P. Kienle1, H.-J. Körner1, M. Mineva3, M. Münch1, G. Münzenberg2, C. Schlegel2, K. Schmidt2, P. Thirolf4, H. Weick2 and K. Zeitelhack1
1 Technische Universität München, 85748 Garching, Germany
2 Gesellschaft für Schwerionenforschung mbH, 64291 Darmstadt, Germany
3 Lund University, 22100 Lund, Sweden
4 Ludwig-Maximilians-Universität München, 85748 Garching, Germany
thomas.faestermann@ph.tum.de
(Received 21 March 2002 / Published online: 31 October 2002)
Abstract
Neutron deficient nuclei near
have been
produced by fragmentation of a
GeV
beam. The fragments were separated, identified and
stopped in a highly segmented silicon strip detector stack. This
detector measured the total energy of emitted
-particles.
-radiation was measured with surrounding detectors. The
half-lives for many nuclides have been determined for the first
time and give important information for the following topics: For
the heaviest particle-stable odd-odd nuclei
,
and
we observed for the first time
fast
-decays, compatible with superallowed Fermi
transitions and confirmed such decays for
,
and
. We have also observed
long-lived
T=0 states in some of these nuclei. We measured the
half-lives of all rp-process waiting-point nuclei from
up to
. In addition we find the
proton drip line nucleus
to decay dominantly via
-decay. To study the Gamov-Teller strength in the
-decay near the doubly magic
we measured
the half-life,
- and
-spectrum of
.
We propose a level scheme for the daughter nuclide
and deduce the Gamov-Teller strength
.
This is one of the largest values known.
21.10.Tg - Lifetimes.
23.40.Hc - Relation with nuclear matrix elements and nuclear structure.
23.50.+z - Decay by proton emission.
© Società Italiana di Fisica, Springer-Verlag 2002