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The beta 2p decay mechanism of Ar-31

Otros títulosThe β2p decay mechanism of Ar-31
AutorFynbo, H. O. U.; García Borge, María José ; Axelsson, L.; Äystö, Juha; Bergmann, U. C.; Fraile, Luis M. ; Honkanen, A.; Hornshøj, P.; Jading, Y.; Jokinen, A.; Jonson, B.; Martel, Ismael; Mukha, I. ; Nilsson, T.; Nyman, G.; Oinonen, M.; Piqueras, Inmaculada; Riisager, K.; Siiskonen, T.; Smedberg, M. H.; Tengblad, Olof ; Thaysen, J.; Wenander, F.
Palabras claveAr-31(β(+)(p)) [from Ca(p,3pxn) reaction]
Measured β-delayed protons E-p, E-2p
pp energy and angular correlations
Ar-31 deduced β1p and β2p decay channels
S-30, Cl-31 deduced levels, T, π, branching ratios
CaO target
On-line mass separation
Double sided Si strip detector
Si p-i-n detectors
Surface barrier Si detector
Delayed 2-proton emission
Proton emission
Fecha de publicación15-ago-2000
SerieNuclear Physics A 677(1-4): 38–60 (2000)
ResumenWe have measured the beta-decay of Ar-31 with a high granularity setup sensitive to multiparticle decay branches. Two-proton emission is observed from the isobaric analog state in Cl-31 to the four lowest states in P-29 and furthermore from a large number of states fed in Gamow-Teller transitions. The mechanism of two-proton emission is studied via energy and angular correlations between the two protons. In all cases the mechanism is found to be sequential yielding information about states in S-30 up to 8 MeV excitation energy. Improved data on the beta-delayed one-proton branches together with the two-proton data provide precise information about the beta-strength distribution up to 15 MeV excitation energy.
Descripción23 pages, 10 figures.-- PACS nrs.: 23.40.Hc; 27.30.+t.-- Printed version published on Sep 11, 2000.
Versión del editorhttp://dx.doi.org/10.1016/S0375-9474(00)00248-7
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