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The beta 2p decay mechanism of Ar-31

H. O. U. Fynbo ; M. J. G. Borge ; Leif Axelsson (Institutionen för experimentell fysik, Subatomär fysik) ; J. Aysto ; U. C. Bergmann ; L. M. Fraile ; A. Honkanen ; P. Hornshoj ; Y. Jading ; A. Jokinen ; Björn Jonson (Institutionen för experimentell fysik, Subatomär fysik) ; I. Martel ; I. Mukha ; Thomas Nilsson ; Göran Nyman (Institutionen för experimentell fysik, Subatomär fysik) ; M. Oinonen ; I. Piqueras ; K. Riisager ; T. Siiskonen ; Martin Smedberg (Institutionen för experimentell fysik, Subatomär fysik) ; O. Tengblad ; J. Thaysen ; Fredrik Wenander (Institutionen för experimentell fysik, Subatomär fysik)
Nuclear Physics A (0375-9474). Vol. 677 (2000), p. 38-60.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: ar-31(beta(+)(p)) [from ca(p, 3pxn) reaction], measured beta-delayed protons e-p, e-2p, pp energy and angular correlations, ar-31 deduced beta 1p and beta 2p decay channels, s-30, cl-31 deduced levels, t, pi, 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, radioactivity, nuclei, ca-35, modes, al-22, be-6

Denna post skapades 2010-10-21. Senast ändrad 2014-09-02.
CPL Pubid: 127920


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Institutionen för experimentell fysik, Subatomär fysik (1900-2005)



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