Abstract
Fission-fragment mass and total-kinetic-energy distributions following fission of the fermium isotopes 256,258,260Fm at low excitation energy have been calculated using the Brownian shape-motion model. A transition from asymmetric fission in 256Fm to symmetric fission in 258Fm is obtained. The total-kinetic-energy distributions for the three isotopes show radically different behaviour due to varying contributions from different fission modes, with a double-humped distribution for 258Fm.
Highlights
The co-existence of two modes in fission leading to very different values of the total kinetic energy (TKE) of the fragments, known as bimodal fission, has been observed in the fermium region [1]
This phenomenon is argued to arise due to two fission paths in the potential-energy landscape; one path is described by the liquid-drop model leading to elongated scission configurations with low TKE, while the other path is influenced by both fragments being close to the doubly magic nucleus 132Sn leading to compact scission with high TKE
A transition from asymmetric fission in 256Fm to symmetric fission in 258Fm is obtained. This transition is in agreement with experimental data for spontaneous fission [1, 9], and has been ascribed to the strong shell effects emerging from fragments approaching the doubly magic nucleus 132Sn
Summary
The co-existence of two modes in fission leading to very different values of the total kinetic energy (TKE) of the fragments, known as bimodal fission, has been observed in the fermium region [1]. This phenomenon is argued to arise due to two fission paths in the potential-energy landscape; one path is described by the liquid-drop model leading to elongated scission configurations with low TKE, while the other path is influenced by both fragments being close to the doubly magic nucleus 132Sn leading to compact scission with high TKE. We calculate fissionfragment mass and TKE distributions for the fermium isotopes 256,258,260Fm using the Brownian shape-motion (BSM) model [3].
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