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.

Ämnesord

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

Nyckelord

ar-31(beta(+)(p)) [from ca(p

t

pp energy and angular correlations

radioactivity

double sided si strip detector

on-line mass separation

cao target

branching ratios

s-30

ar-31 deduced beta 1p and beta 2p decay channels

ca-35

si p-i-n detectors

measured beta-delayed protons e-p

3pxn) reaction]

delayed 2-proton emission

modes

nuclei

be-6

surface barrier si detector

cl-31 deduced levels

pi

al-22

e-2p

proton emission

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