Abstract :
[en] 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 the presence of a single Λ hyperon with respect to normal nuclear matter.
Funding text :
We thank Dr. Alain Boudard, Dr. Davide Mancusi, and Dr. Sylvie Leray for enlightening discussions and Dr. Georg Schnabel for his technical support. This work was partially supported by the P2IO LabEx (ANR-10-LABX-0038) in the framework “Investissements d’Avenir” (ANR-11-IDEX-0003-01), managed by the Agence Nationale de la Recherche (ANR) (France), and by the EU ENSAR2 FP7 project (Grant Agreement No. 654002). I. V. thanks the support of the European Union’s Horizon 2020 research and innovation programme under the Grant Agreement No. 824093. J. L. R.-S. is thankful for the support by the Department of Education, Culture and University Organization of the Regional Government of Galicia under the Postdoctoral Fellowship Grant No. ED481D-2021-018 and by the “Ramón y Cajal” programme under the Grant No. RYC2021-031989-I, funded by MCIN/AEI/10.13039/501100011033 and by “European Union NextGenerationEU/PRTR.”
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