The E1 capture amplitude in C-12 (alpha,gamma(0))O-16

L Gialanella, D Rogalla, F Strieder, S Theis, G Gyurki, C Agodi, R Alba, M Aliotta, L Campajola, A Del Zoppo, A D'Onofrio, P Figuera, U Greife, G Imbriani, A Ordine, V Roca, C Rolfs, M Romano, C Sabbarese, P SapienzaF Schumann, E Somorjai, F Terrasi, H P Trautvetter

Research output: Contribution to journalArticlepeer-review

Abstract

An excitation function of the ground-state gamma (0)-ray capture transition in C-12(alpha, gamma)O-16 at theta (gamma) = 90 degrees was obtained in far geometry using six Ge detectors, where the study of the reaction was initiated in inverse kinematics involving a windowless gas target. The detectors observed predominantly the El capture amplitude. The data at E = 1.32 to 2.99 MeV lead to an extrapolated astrophysical S factor S-E1(E-0) = 90 +/- 15 keV b at E-0 = 0.3 MeV (for the case of constructive interference between the two lowest E1 sources), in good agreement with previous works. However, a novel Monte Carlo approach in the data extrapolation reveals systematic differences between the various data sets such that a combined analysis of all available data sets could produce a biased estimate of the S-E1(E-0) value. As a consequence, the case of destructive interference between the two lowest E1 sources with S-E1(E-0) = 8 +/- 3 keV b cannot be ruled out rigorously.

Original languageEnglish
Pages (from-to)357-370
Number of pages14
JournalEuropean Physical Journal A: Hadrons and Nuclei
Volume11
Issue number3
DOIs
Publication statusPublished - Jul 2001

Keywords

  • STELLAR ENERGIES
  • CROSS-SECTION

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