학술논문
The α-decay of the Hoyle state in 12C: a new high-precision investigation
Document Type
article
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.
Source
EPJ Web of Conferences, Vol 184, p 01005 (2018)
Subject
Language
English
ISSN
2100-014X
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.