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Lifetime of 26S and a Limit for its 2p Decay Energy

A. S. Fomichev ; I. G. Mukha ; S. V. Stepantsov ; L. V. Grigorenko ; E. V. Litvinova ; V. Chudoba ; I. A. Egorova ; M. S. Golovkov ; A. V. Gorshkov ; V. A. Gorshkov ; G. Kaminski ; S. A. Krupko ; Y. L. Parfenova ; S. I. Sidorchuk ; R. S. Slepnev ; G. M. Ter-Akopian ; R. Wolski ; Mikhail V. Zhukov (Institutionen för fundamental fysik, Subatomär fysik)
International Journal of Modern Physics E - Nuclear Physics (0218-3013). Vol. 20 (2011), 6, p. 1491-1508.
[Artikel, refereegranskad vetenskaplig]

The unknown isotope (26)S, expected to decay by two-proton (2p) emission, was studied theoretically and searched experimentally. The structure of this nucleus was examined within the relativistic mean field (RMF) approach. A method for taking into account the many-body structure in the three-body decay calculations was developed. The results of the RMF calculations were used as an input for the three-cluster decay model optimized for the study of a possible 2p decay branch of this nucleus. The experimental search for (26)S was performed by fragmentation of a 50.3 A MeV (32)S beam. No events of a particles table (26)S or (25)P (a presumably proton-unstable subsystem of (26)S) were observed. Based on the obtained production systematics, an upper half-life limit of T(1/2) < 79 ns was established from the time-of-flight through the fragment separator. Together with the theoretical lifetime estimates for two-proton decay, this gives a decay energy limit of Q(2p) > 640 keV for (26)S. Analogous limits for (25)P are found as T(1/2) < 38 ns and Q(p) > 110 keV. In the case that the one-proton emission is the main branch of the (26)S decay, a limit Q(2p) > 230 keV would follow for this nucleus. According to these limits, it is likely that (26)S resides in the picosecond life time range

Nyckelord: Properties of nuclei, nuclear energy, mean-field-theory, 2-proton decay, drip lines, light-nuclei, proton, halos, be-6, neutron, fe-45, shell, radioactivity

Denna post skapades 2011-08-11.
CPL Pubid: 144081


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Institutionen för fundamental fysik, Subatomär fysik (2005-2013)



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