Author:
Dell‘Aquila D.,Lombardo I.,Verde G.,Vigilante M.,Acosta L.,Agodi C.,Cappuzzello F.,Carbone D.,Cavallaro M.,Cherubini S.,Cvetinovic A.,D‘Agata G.,Francalanza L.,Guardo G.L.,Gulino M.,Indelicato I.,La Cognata M.,Lamia L.,Ordine A.,Pizzone R.G.,Puglia S.M.R.,Rapisarda G.G.,Romano S.,Santagati G.,Spartà R.,Spadaccini G.,Spitaleri C.,Tumino A.
Abstract
The αdecay path of the Hoyle state in 12C (Ex = 7:654MeV) represents one ofthe most challenging questions of modern nuclear physics. Its knowledge can help in theunderstanding of cluster configurations in light nuclei and the possible existence of Bose-Einstein condensates in nuclei. In stars, it is involved in the so-called 3αprocess, wherethe 12C nucleosynthesis occurs. We studied the 14N(d; α2)12C(7:654) reaction at 10:5MeVincident energy to probe its direct decay component. We found, with a precision higherof a factor 5 than any other previous experiment, an almost total absence of direct decaysby-passing the ground state of 8Be. From our analysis, a new upper limit of such decayis found at 0:043% (95% C.L.). Astrophysical 3α process reaction rate calculations haveto be accordingly revised.
Cited by
2 articles.
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