Dissipation coefficients; Dissipation mechanism; Electromagnetics; Hypernuclei; Neutron stars; Nuclear matters; State of the art; Transport theory; Physics and Astronomy (all); Nuclear Theory; General Physics and Astronomy
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.
Disciplines :
Physics
Author, co-author :
Rodríguez-Sánchez, J L ; CITENI, Campus Industrial de Ferrol, Universidade da Coruńa, E-15403 Ferrol, Spain ; IGFAE, Universidad de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
Cugnon, Joseph ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Interactions fondamentales en physique et astrophysique (IFPA)
David, J-C ; IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
Hirtz, J ; IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France ; Physics Institute, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
Kelić-Heil, A ; GSI-Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
Vidaña, I; INFN, Sezione di Catania, Dipartimento di Fisica "Ettore Majorana," Università di Catania, I-95123 Catania, Italy
Language :
English
Title :
Constraint of the Nuclear Dissipation Coefficient in Fission of Hypernuclei.
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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The uncertainty is calculated with the standard deviation of the mean, using the results listed in the Table I for hypernuclear matter.
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