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Two-proton emission in the decay of Ar-31

AuthorsAxelsson, L.; Äystö, Juha; Bergmann, U. C.; García Borge, María José ; Fraile, Luis M. ; Fynbo, H. O. U.; Honkanen, A.; Hornshøj, P.; Jokinen, A.; Jonson, B.; Martel, Ismael; Mukha, I. ; Nilsson, T.; Nyman, G.; Petersen, B.; Riisager, K.; Smedberg, M. H.; Tengblad, Olof
KeywordsRadioactivity Ar-31(beta(+)p) [from Ca(p,3pxn) reaction]
Measured beta-delayed E-p, pp-coin
Ar-31 deduced beta 2p-decay channels
CaO target
Surface barrier Si detectors
On-line mass separation
Delayed 2-proton emission
3-particle decays
Issue Date19-Jan-1998
CitationNuclear Physics A 628(3): 345-362 (1998)
AbstractSeveral beta-delayed two-proton branches were observed in the decay of Ar-31, the most intense ones proceeding through the isobaric analogue state (IAS) in Cl-31. The mechanism of the two-proton emission is studied via the energy and angular distributions of the two protons, Simultaneous emission of the two protons fits the present data well, sequential decays might also describe them. Independent of the decay mechanism, a spin of 5/2 for the IAS is suggested, An improved limit on the direct two-proton emission from the ground state of Ar-31 is presented.
Description18 pages, 7 figures, 2 tables.-- PACS nrs.: 23.40.Hc; 27.30.+t.
Publisher version (URL)http://dx.doi.org/10.1016/S0375-9474(97)00623-4
Appears in Collections:(CFMAC-IEM) Artículos
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