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Charge distributions of Ra recoil ions produced in 12C+Pb fusion-evaporation reactions

Sagaidak, R. N.; Kondratiev, N. A.; Corradi, L.; Fioretto, E.; Mijatović, Tea; Montagnoli, G.; Scarlassara, F.; Stefanini, A. M.; Szilner, Suzana (2018) Charge distributions of Ra recoil ions produced in 12C+Pb fusion-evaporation reactions. Physical review. C, 97 (5). ISSN 2469-9985

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Charge state distributions of the Ra recoil ions produced in the 12C+Pb fusion-evaporation reactions have been obtained by measuring their yields as a function of the high voltage applied to an electrostatic deflector. Well-defined two-humped yield curves for evaporation residues (ERs) were observed. Such observations can be explained by the different sets of charge states inherent in Ra recoil ions. These charge sets correspond to the equilibrated and nonequilibrated components, as earlier observed for evaporation residues produced in different reactions. The main parameters of the distributions (mean charge values, widths, and relative intensities) for both components have been estimated using Monte Carlo simulations of the transmission of the Ra recoil ions through the deflector. For the equilibrated component the values of the mean charge and width are close to those given by different empirical systematics. For the nonequilibrated component these parameters have been obtained for the first time. The additional nonequilibrated ionization is presumably due to the formation of inner shell vacancies produced by the internal conversion of nuclear isomeric transitions of ERs. Nonequilibrated charge parameters obtained for Ra recoil ions are compared to similar available experimental data and some theoretical predictions.

Item Type: Article
Uncontrolled Keywords: nuclear reaction ; fusion-evaporation reactions
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Nuklearna struktura i reakcije: eksperimentima prema neutronskoj liniji kapanja-SR-ETNoSuzana SzilnerIP-2013-11-7194HRZZ
Depositing User: Suzana Szilner
Date Deposited: 18 Jul 2018 10:48
DOI: 10.1103/PhysRevC.97.054622

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