The beta 2p decay mechanism of Ar-31
The beta 2p decay mechanism of Ar-31
We 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.
This work was supported in part by the Spanish agency CICYT under contract number AEN96-1679. I. Piqueras thanks the Svenska Institutet for a Guest Scholarship.
23 pages, 10 figures.-- PACS nrs.: 23.40.Hc; 27.30.+t.-- Printed version published on Sep 11, 2000.
Peer reviewed
Ca-35, Be-6, Ar-31 deduced β1p and β2p decay channels, Si p-i-n detectors, Delayed 2-proton emission, On-line mass separation, Al-22, Surface barrier Si detector, Measured β-delayed protons E-p, E-2p, pp energy and angular correlations, S-30, Cl-31 deduced levels, T, π, branching ratios, CaO target, Nuclei, Double sided Si strip detector, Radioactivity, Ar-31(β(+)(p)) [from Ca(p,3pxn) reaction], Proton emission, Modes
Ca-35, Be-6, Ar-31 deduced β1p and β2p decay channels, Si p-i-n detectors, Delayed 2-proton emission, On-line mass separation, Al-22, Surface barrier Si detector, Measured β-delayed protons E-p, E-2p, pp energy and angular correlations, S-30, Cl-31 deduced levels, T, π, branching ratios, CaO target, Nuclei, Double sided Si strip detector, Radioactivity, Ar-31(β(+)(p)) [from Ca(p,3pxn) reaction], Proton emission, Modes
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