Bochum 1998 – scientific programme
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HK: Hadronen und Kerne
HK 39: Nuclear Astrophysics III
HK 39.4: Talk
Tuesday, March 17, 1998, 18:00–18:15, E
Discovery of the astrophysically interesting 3/2+ state of 19F at Ex = 7101 keV — •J.W. Hammer2, Y. Butt1, P. Parker1, M. Jaeger2, R. Kunz2, A. Mayer2, R. Schreiter2, and G. Staudt3 — 1Wright Nuclear Structure Laboratory, Yale University, USA — 2Institut f"ur Strahlenphysik, Universit"at Stuttgart, D-70550 Stuttgart — 3Physikalisches Institut, Universit"at T"ubingen, D-72076 Tübingen
We report on the discovery of the astrophysically interesting 3/2+
state in 19F at Ex = 7101 keV via
the 15N(α,γ)19F reaction at the University of
Stuttgart 4 MV Dynamitron. The experiment has been performed
using enriched 15N gas in the windowless gas target facility
Rhinoceros, BGO-shielded HPGe detectors of about 100 %
relative efficiency and He+ beam currents of about 80 µA.
This new and directly measured resonance, which has a total width of
28 keV and a considerable strength, confirms the recent discovery of
the mirror 3/2+ state (Ex = 7070 keV) in 19Ne at Argonne
National Laboratory [Re96] and Louvain la Neuve [Co95] which dominates
the recycling / breakout rate from the Hot CNO-cycle to the rp-process
via 18F(p,α)15O and 18F(p,γ)19Ne.
The 3/2+ state in 19F has been identified by confirming its
unique γ–decay scheme.
[Re96] K.E. Rehm et al., Phys. Rev. C 53 (1996) 1950
[Co95] R Coszach et al., Phys. Letters B 353 (1995) 184