Constraint of the Nuclear Dissipation Coefficient in Fission of Hypernuclei

Abstract

Experimental studies of nuclear fission induced by fusion, transfer, spallation, fragmentation, and electromagnetic reactions in combination with state-of-the-art calculations are successful to investigate the nuclear dissipation mechanism in normal nuclear matter, containing only nucleons. The dissipation mechanism has been widely studied by the use of many different fission observables and nowadays the dissipation coefficients involved in transport theories are well constrained. However, the existence of hypernuclei and the possible presence of hyperons in neutron stars make it necessary to extend the investigation of the nuclear dissipation coefficient to the strangeness sector. In this Letter, we use fission reactions of hypernuclei to constrain for the first time the dissipation coefficient in hypernuclear matter, observing that this coefficient increases a factor of 6 in presence of a single $\Lambda$-hyperon with respect to normal nuclear matter.

6 pages, 2 figures

References in corpus (4)

• Hyperon-nucleon interactions - a chiral effective field theory approach
• Brownian shape motion on five-dimensional potential-energy surfaces: Nuclear fission-fragment mass distributions
• Extension of the Liège Intranuclear-Cascade model to reactions induced by light nuclei
• Viscosity of neutron star matter and $r$-modes in rotating pulsars

Cited by in corpus (1)

• A direct probe of $\Lambda$ potential in nuclear medium