| Zugriffsnummer | 21996 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | β-delayed α emission of 18N: Broad J π=1- states in the 14C + α system |
| Autor(in); Institution |
Buchmann, L.; TRIUMF, Vancouver, CANADA
D’Auria, J.; Simon Fraser University, Burnaby, CANADA
Dombsky, M.; Simon Fraser University, Burnaby, CANADA; TRIUMF, Vancouver, CANADA
Giesen, Ulrich; 6.4, Ionenbeschleuniger und Referenzstrahlungsfelder, PTB-Braunschweig; TRIUMF, Vancouver, CANADA
Jackson, K. P.; TRIUMF, Vancouver, CANADA
McNeely, P.; University of Alberta, Edmonton, CANADA; Max-Planck Institut für Plasmaphysik, Garching, GERMANY
Powell, J.; University of Toronto, Toronto, CANADA; Lawrence Berkeley Laboratory, Berkeley, USA
Volya, A.; Florida State University, Tallahassee, USA
|
| Quelle/Jahr | Physical Review C: 75 (2007), 012804-1 - 012804-5 |
| ISSN | 0556-2813 |
| DOI | |
| Verlag | Ridge, NY: American Physical Society |
| Klassifikationscode | PACS: 23.60.+e ; PACS: 25.55.Ci ; PACS: 27.20.+n |
| Freie Schlagworte | nuclear structure ; β-delayed α-decay ; nuclear astrophysics |
| Zusammenfassung | The β-delayed α-spectrum of 18N has been measured at the TISOL facility at TRIUMF resolving the structure of a broad α-particle distribution at α-energies of 1.5-5.5 MeV into several states that show a distinct interference pattern. R-matrix fits assuming a solely J π = 1- partial wave confirm this finding. The extrapolated low energy part of this structure constitutes the natural parity background in a possible experiment to observe the parity forbidden α-decay of the Ex = 6.880 MeV, J π = 0- state in 18O that is estimated from the fit to be 2 × 10-8 of the intensity of the E α = 1081 keV peak. In addition, the tails of the broad 1- states observed likely contribute to the astrophysical 14C(α, γ) 18O reaction rate though the experimental information available is too incomplete to allow precise predictions. The β-delayed α-spectrum of 18N also excludes complex β-feeding amplitudes at a significant level. The states seen in the β-delayed α-decay produce a pattern of approximately equally spaced 1- states in 18O consistent with J π = 1- states seen at the same and higher excitation energies of 18O. |
Zitierung
Buchmann, L., D’Auria, J., Dombsky, M., Giesen, U., Jackson, K. P., McNeely, P., Powell, J., & Volya, A. (2007). β-delayed α emission of ¹⁸N: Broad J π=1⁻ states in the ¹⁴C + α system. Physical Review C, 75, 012804-1–012804-5. https://doi.org/10.1103/physrevc.75.012804