Temperature dependence of the nucleon effective mass and the physics of stellar collapse

Donati, Paola; Pizzochero, Pierre M.; Bortignon, P. F.; Broglia, R. A.

doi:10.1103/physrevlett.72.2835

Cited by 72 publications

(113 citation statements)

References 13 publications

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“…This implies, apart from the decrease of the level density parameter a ∝ m* , an increase with the temperature of the symmetry (kinetic) energy contribution to the nuclear binding energy through the dependence on the isospin component [16], [17], [18]:…”

Section: Isospin Effects On the Symmetry Energymentioning

confidence: 99%

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Search for isospin effects on nuclear level density

Brondi

Nitto

Rana

et al. 2010

EPJ Web of Conferences

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Abstract. Studies on the isospin dependence of the level density have been recently reported in the literature for nuclei with 20≤A≤110. Corrections to the level density have been deduced which would imply a significant reduction of this quantity for nuclei far from the valley of stability. Isospin effects on the level density are also expected through the symmetry energy contribution to the nuclear masses, which is predicted to increase with the temperature. According to these findings, we have implemented the statistical model in order to account for isospin effects on the level density parameter a and on the temperature-dependent symmetry energy. We present the results of calculations for the decay of a variety of neutron-rich composite systems. We found that isospin produces sizable effects on different observables, this result being promising for future experiments with the second generation RIB facilities SPES and SPIRAL2. We report the results of a first experiment aimed at searching for isospin effects in the decay of 139 Eu composite nuclei produced by a stable beam at E x =90 MeV.

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Section: Isospin Effects On the Symmetry Energymentioning

confidence: 99%

“…It has been shown that the gain in the explosion may be comparable to the explosion energy itself [16]. Fig.…”

Section: Isospin Effects On the Symmetry Energymentioning

confidence: 99%

Search for isospin effects on nuclear level density

Brondi

Nitto

Rana

et al. 2010

EPJ Web of Conferences

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“…Fusion reactions, where the composite system deexcites mainly by evaporation, allow to experimentally access the nuclear level density ρ(E) and the limiting temperature T lim , in order to study their N/Z dependence. The nuclear level density is an important quantity for the study of both thermal and decay properties of excited nuclei and for the determination of cross sections used in nuclear astrophysics calculations [1,2]. Moreover ρ is an essential ingredient in calculating the statistical decay of a compound nucleus (CN) in statistical models.…”

Section: Introductionmentioning

confidence: 99%

Exploring isospin effects on the level density parameter

Marini

Rivet

Borderie

et al. 2010

EPJ Web of Conferences

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“…We will adopt the "standard" average values of these two parameters: m ω /m = 1.7 and T 0 = 2 MeV. Their meaningful physical ranges are: 1.4 m ω /m 1.8 and 1.9 T 0 2.1, which account for the dependence on the nucleus under study (Donati et al 1994). In analogy to the results of the Fermi gas model and assuming that only the kinetic part of the symmetry energy depends on the effective mass, it has been argued in Paper I that the temperature dependence of E sym can be obtained by the following analytical expression:…”

Section: Equation Of Statementioning

confidence: 99%

“…By means of a one-dimensional Newtonian numerical simulation, we study the effect of the temperature dependence of the inmedium nucleon mass. In the article by Donati et al (1994, Paper I from now on), a first investigation of the temperature dependence of the nuclear symmetry energy on the dynamics of the collapse was carried out in a one-zone (uniform mean density) model. This approach is easy to implement and nevertheless is able to incorporate the important physics coming into play.…”

Section: Introductionmentioning

confidence: 99%

Effects of the temperature dependence of the in-medium nucleon mass on core-collapse supernovae

Fantina

Blottiau

Margueron

et al. 2012

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Aims. A complete description of the core collapse supernova mechanism requires an appropriate treatment of both the hydrodynamics and the microphysics. We study the influence of a nuclear physics input, namely the temperature dependence of the nucleon effective mass in nuclei induced by the in-medium effects, in the core collapse of a massive star. Methods. We present here the first implementation of this nuclear input in a hydrodynamical one-dimensional simulation. The simulations are performed with a spherically symmetric Newtonian model, with neutrino transport treated in the multi-group flux-limited diffusion approximation. Results. The inclusion of the temperature dependence of the in-medium nucleon mass has an impact on the equation of state of the system and reduces the deleptonisation during the collapse. This results in a non-negligible effect on the shock wave energetics. The shock wave is formed more outwards, and in the first few milliseconds after bounce the shock front has propagated further out.

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Temperature dependence of the nucleon effective mass and the physics of stellar collapse

Cited by 72 publications

References 13 publications

Search for isospin effects on nuclear level density

Search for isospin effects on nuclear level density

Exploring isospin effects on the level density parameter

Effects of the temperature dependence of the in-medium nucleon mass on core-collapse supernovae

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