Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 39: Nuclear Astrophysics III

HK 39.4: Vortrag

Dienstag, 17. März 1998, 18:00–18:15, E

Discovery of the astrophysically interesting 3/2⁺ state of ¹⁹F at E_x = 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 E_x = 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 (E_x = 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