https://doi.org/10.1140/epja/i2016-16304-x
Regular Article - Experimental Physics
Beta-delayed proton emission from 20Mg
1
Department of Physics and Astronomy, Aarhus University, DK-8000, Aarhus C, Denmark
2
Department of Physics, University of York, YO10 5DD, York, N Yorkshire, UK
3
Instituto de Estructura de la Materia, CSIC, E-28006, Madrid, Spain
4
ISOLDE, PH Department, CERN, CH-1211, Geneva 23, Switzerland
5
Department of Nuclear Physics, Lund University, SE-221 00, Lund, Sweden
6
KU-Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001, Leuven, Belgium
7
Facultad de Ciencias Fisicas, Universidad Complutense de Madrid, CEI Moncloa, 28040, Madrid, Spain
8
Helsinki Institute of Physics, University of Helsinki, P.O. Box 64, FIN-00014, Helsinki, Finland
9
Department of Physics, University of Jyväskylä, P.O. Box 35, FIN-40014 University of Jyväskylä, Jyväskylä, Finland
10
Department of Physics, Oliver Lodge Laboratory, University of Liverpool, L69 7ZE, Liverpool, UK
11
Department of Physics, Chalmers University of Technology, SE-412 96, Göteborg, Sweden
12
STFC Daresbury, WA4 4AD, Daresbury, Warrington, UK
13
“Horia Hulubei” National Institute of Physics and Nuclear Engineering, RO-077125, Magurele, Romania
14
Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937, Köln, Germany
* e-mail: morten.vinther.lund@gmail.com
Received:
5
July
2016
Accepted:
31
August
2016
Published online:
4
October
2016
Beta-delayed proton emission from 20 Mg has been measured at ISOLDE, CERN, with the ISOLDE Decay Station (IDS) setup including both charged-particle and gamma-ray detection capabilities. A total of 27 delayed proton branches were measured including seven so far unobserved. An updated decay scheme, including three new resonances above the proton separation energy in 20 Na and more precise resonance energies, is presented. Beta-decay feeding to two resonances above the Isobaric Analogue State (IAS) in 20 Na is observed. This may allow studies of the 4032.9(2.4)keV resonance in 19 Ne through the beta decay of 20 Mg, which is important for the astrophysically relevant reaction 15O(,
)19Ne . Beta-delayed protons were used to obtain a more precise value for the half-life of 20 Mg, 91.4(1.0)ms.
© SIF, Springer-Verlag Berlin Heidelberg, 2016