Fission probabilities ofAm242,Cm243, and

Abstract

:We have measured the fission probabilities of 242

Experimental set-up for the simultaneous measurement of fission and γ-emission probabilities induced by transfer or inelastic-scattering reactions

“…Our aim is to measure fission probabilities with relative uncertainties ∆P f /P f < 10% and γemission probabilities with ∆P γ /P γ < 25%. Our previous work has shown that with these uncertainties it is possible to fix model parameters [4] and to investigate the surrogatereaction method [6,8,9]. In refs.…”

“…In refs. [4] and [9] we have performed a very thorough uncertainty analysis of the decay probabilities, taking into account the covariances between the different measured quantities. Using the equations developed in section G of [9], we can estimate the impact of the uncertainty in the detection efficiencies ε f and on the measured decay probabilities.…”

“…In the last position we place a target backing alone. Measurements with the target backing are necessary to evaluate place on it, see [4,9]. The airlock includes a high center of the targets on the beam axis.…”

“…They were first proposed as fission detectors by Siegert [11], and have been used as fission detectors within large γ-detector arrays as Euroball [12]. The CENBG collaboration has many years of experience using them for the measurement of fission probabilities [4,6,13].…”

“…However, when no experimental data are available, the existing nuclear-structure models give very different predictions for these properties, which lead to discrepancies between the calculated cross sections as large as two orders of magnitude or more [1,2]. Fission probabilities induced by transfer and inelastic-scattering reactions with light projectile nuclei have been used since many years to explore the fission threshold and infer fissionbarrier parameters [3,4]. In particular, transfer-and inelastic-scattering-induced fission probabilities are the only way to obtain information on the fission barriers of fissile nuclei, i.e.…”