Constraining the destruction rate of 
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 in stellar nucleosynthesis through the study of the 
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Gastis, P.; Perdikakis, G.; Dissanayake, J.; Tsintari, Pelagia; Sultana, I.; Brune, C. R.; Massey, T. N.; Meisel, Z.; Voinov, A.; Brandenburg, K.; Danley, T. W.; Giri, R.; Jones-Alberty, Y.; Paneru, S. N.; Soltesz, D.; Subedi, S. K.

doi:10.1103/physrevc.101.055805

Cited by 8 publications

(2 citation statements)

References 36 publications

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“…Along these lines, since Eu is also a lithophile element and by following (Wang et al 2020a) it is a preferred proxy for long-lived radionuclides 235,238 U and 232 Th in terrestrial-type planets, we therefore adopt Eu/(Mg+Si) as a proxy for indicating the concentration of these long-lived isotopes and the budget of the resultant radiogenic heating production over geologic timescales. A similar approach awaits formulation, however, to estimate 40 K abundance (Gastis et al 2020). Following Frank et al (2014), we assume that the α-CenA/B system has an initial value of 40 K as that of the Solar System, but we also note that due to the age of the stars in the α-CenA/B system (Morel 2018;Salmon et al 2021), 40 K is considerably depleted in the modern mantle of our model α-Cen-Earth (Wang et al 2020a).…”

Section: Key Geochemical Ratiosmentioning

confidence: 99%

A model Earth-sized planet in the habitable zone of $α$ Centauri A/B

Wang,

Lineweaver,

Quanz

et al. 2021

Preprint

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The bulk chemical composition and interior structure of rocky exoplanets are of fundamental importance to understanding their long-term evolution and potential habitability. Observations of the chemical compositions of the solar system rocky bodies and of other planetary systems have increasingly shown a concordant picture that the chemical composition of rocky planets reflects that of their host stars for refractory elements, whereas this expression breaks down for volatiles. This behavior is explained by devolatilization during planetary formation and early evolution. Here, we apply a devolatilization model calibrated with the solar system bodies to the chemical composition of our nearest Sun-like stars -α Centauri A and B -to estimate the bulk composition of any habitable-zone rocky planet in this binary system ("α-Cen-Earth"). Through further modeling of likely planetary interiors and early atmospheres, we find that compared to Earth, such a planet is expected to have (i) a reduced (primitive) mantle that is similarly dominated by silicates albeit enriched in carbon-bearing species (graphite/diamond); (ii) a slightly larger iron core, with a core mass fraction of 38.4 +4.7 −5.1 wt% (cf. Earth's 32.5 ± 0.3 wt%); (iii) an equivalent water-storage capacity; and (iv) a CO 2 -CH 4 -H 2 O-dominated early atmosphere that resembles that of Archean Earth. Further taking into account its ∼ 25% lower intrinsic radiogenic heating from long-lived radionuclides, an ancient α-Cen-Earth (∼ 1.5-2.5 Gyr older than Earth) is expected

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Section: Key Geochemical Ratiosmentioning

confidence: 99%

A model Earth-sized planet in the habitable zone of $α$ Centauri A/B

Wang,

Lineweaver,

Quanz

et al. 2021

Preprint

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“…Recently, the importance of certain (n,p) and (n,a) reactions to questions related to the radiogenic heating of terrestrial planets with implications for the habitability of exoplanets was explored by the group at Central Michigan University [18].…”

Section: Introductionmentioning

confidence: 99%

Implementation and validation of realistic (n,x) reaction yields in GEANT4 utilizing a detailed evaluated nuclear reaction library below 20 MeV

Tsintari¹,

Perdikakis²,

Lee³

et al. 2022

Preprint

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Neutron-induced reactions with charged particle emission play an important role in a variety of research fields ranging from fundamental nuclear physics and nuclear astrophysics to applications of nuclear technologies to energy production and material science. Recently, the capability to study reactions with radioactive targets has become important to significantly advance research in explosive nucleosynthesis and nuclear applications. To achieve the relevant research goals and study (n,x) reactions over a broad neutron beam energy range, the Low Energy Neutron-induced charged-particle (Z) chamber (LENZ) at Los Alamos Neutron Science Center (LANSCE) was developed along with varied ancillary instrumentation to enable the aforementioned research program. For the (n,x) reactions of interest at low energies, a precise simulation of the discrete spectrum of emitted charged particles is essential. In addition, since LANSCE is a user facility, a simulation application that can be easily accessible by users has high value. With these goals in mind, we have developed a detailed simulation using the GEANT4 toolkit. In this work, we present the implementation and the validation of the simulation using experimental data from recent campaigns with the LENZ instrument. Specifically, we benchmark the simulation against a similar MCNP-based tool and determine the realistic range of applicability for the probability biasing technique used. We describe our implementation of an evaluated library with angular distribution and partial cross-section data, and we perform a validation of the application based on comparisons of simulated spectra with the experimental ones, for a number of targets used in previous experimental campaigns. Last, we discuss the limitations, caveats, and assets of the simulation code and techniques used.

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