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SUMMARY:Influence of the tetraneutron on the EoS under core-collapse super
 nova and heavy-ion collision conditions
DTSTART;VALUE=DATE-TIME:20240528T153000Z
DTEND;VALUE=DATE-TIME:20240528T155000Z
DTSTAMP;VALUE=DATE-TIME:20260812T030012Z
UID:indico-contribution-23818@indico.ific.uv.es
DESCRIPTION:Speakers: Helena Pais (University of Coimbra)\nLight (e.g. deu
 terons\, tritons\, helions\, α−particles)\, and heavy (pasta phases) nu
 clei exist in nature in core-collapse supernova matter and neutron star (N
 S) mergers\, where temperatures of the order of 50 to 100 MeV may be attai
 ned. In the NS inner crust\, that is under different conditions of tempera
 ture\, density and asymmetry\, these heavy clusters should also be present
 . The appearance of these clusters can modify the neutrino transport\, and
 \, therefore\, consequences on the dynamical evolution of supernovae and o
 n the cooling of proto-neutron stars are expected. However\, a correct est
 imation of their abundance implies that an in-medium modification of their
  binding energies is precisely derived. At such temperatures\, other exoti
 c degrees of freedom\, such as hyperons\, ∆−isobars\, or even resonant
  states of four neutrons\, may appear. Recently\, such a resonant state of
  four neutrons (tetraneutron) with an energy of E4n = 2.37±0.38(stat) ± 
 0.44(sys) MeV and a width of Γ = 1.75±0.22(stat) ± 0.30(sys) MeV was re
 ported. In this work\, we analyze the effect of including such an exotic s
 tate on the yields of other light clusters. We use a relativistic mean-fie
 ld (RMF) formalism\, where we consider in-medium effects in a two-fold way
  – that is\, via the couplings of the clusters to the mesons\, and via a
  binding energy shift – to compute the low-density equation of state (Eo
 S) for nuclear matter at finite temperature and fixed proton fraction. We 
 consider five light clusters – namely deuterons\, tritons\, helions\, α
 −particles\, and 6He – immersed in a gas of protons and neutrons\, and
  we calculate their abundances and chemical equilibrium constants with and
  without the tetraneutron. We also analyze how the associated energy of th
 e tetraneutron would influence such results. We find that the low-temperat
 ure\, neutron-rich systems are the ones most affected by the presence of t
 he tetraneutron\, making NSs excellent environments for their formation. M
 oreover\, its presence in strongly asymmetric matter may increase the prot
 on and α−particle fractions considerably. This may have an influence on
  the dissolution of the accretion disk of the merger of two NSs.\n\nhttps:
 //indico.ific.uv.es/event/7332/contributions/23818/
LOCATION:ADEIT - Valencia
URL:https://indico.ific.uv.es/event/7332/contributions/23818/
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