High resolution measurements of mass, energy and nuclear charge correlations for 229Th(nth, f) with the cosi fan tutte spectrometer
1989; Elsevier BV; Volume: 502; Linguagem: Inglês
10.1016/0375-9474(89)90666-0
ISSN1873-1554
AutoresN. Boucheneb, P. Geltenbort, Muhammad Irfan Asghar, G. Barreau, T.P. Doan, F. Gönnenwein, B. Leroux, A. Oed, A. Sicre,
Tópico(s)Astro and Planetary Science
ResumoThe COSI FAN TUTTE spectrometer has been used to measure for the first time in one go the mass-charge-energy correlations for well-resolved light group masses for 229Th(nth, f). About 4.8 × 105 events were collected in a ≈ 3 months run. The global mass distribution shows structures and the distribution for EL = (112±0.5) MeV is dominated by mass numbers AL = 86 and 96. The mean kinetic energy 〈EL〉 shows strong fluctuations as a function of the light fragment mass AL. The mean proton odd-even effects in yields and energy are дp = (40.0±1.0)% and д Eo-eTKE = (1.35±0.17) MeV, respectively. The δp(EL) varies by a factor of ≈ 3 for EL = 02 to 107 MeV with a plateau for EtL ≈ 96 to 103 MeV. The mean neutron odd-even effect is δn = (1.95±0.5)%). The mean value of the conditional variance is 〈σ2 (Z¦A)〉 = (0.33±0.02) and it varies little with energy. The conditional variance seems to decrease as one goes from 252Cf to 230Th. These data are discussed in the context of existing results on other nuclei.
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