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541
Interstellar Nitrogen Isotope Ratios: Measurements on Tracers of C14N and C15N
Published 2024-01-01“…The nitrogen isotope ratio ^14 N/ ^15 N is a powerful tool to trace Galactic stellar nucleosynthesis and constrain Galactic chemical evolution. …”
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542
Transition Probabilities of Near-infrared Ce iii Lines from Stellar Spectra: Applications to Kilonovae
Published 2023-01-01“…Kilonova spectra provide us with information of r -process nucleosynthesis in neutron star mergers. However, it is still challenging to identify individual elements in the spectra mainly due to the lack of experimentally accurate atomic data for heavy elements at near-infrared wavelengths. …”
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543
On Low Hubble Expansion Rate from Planck Data Anomalies
Published 2022-12-01“…We analyze the stability of the effective Newtonian constant <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>G</mi><mrow><mi>e</mi><mi>f</mi><mi>f</mi></mrow></msub></semantics></math></inline-formula> and its agreement with Big Bang Nucleosynthesis (BBN) constraints. We show that our results are highly compatible with the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="normal">Λ</mi></semantics></math></inline-formula>CDM paradigm, rather extending the perspective for further studies on redshift-space galaxy clustering data. …”
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544
Ionized-gas Metallicity of the Strong [O iii]λ5007 Emission-line Compact Galaxies in the LAMOST Survey
Published 2023-01-01“…The N/O measurements of the strong [O iii ] λ 5007 emission-line compact galaxies mainly locate at a plateau at low metallicity, indicating the product of primary nucleosynthesis. The Ne3O2 and O32 relation follows a tight linear relation with no redshift evolution. …”
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545
Experimental and numerical investigation of magneto-plasma optical properties toward measurements of opacity relevant for compact binary objects
Published 2022-10-01“…The KN light curve also delivers precious information on the composition and dynamics of the neutron-rich post-merger plasma ejecta (relying on r-process nucleosynthesis yields). In this sense, studying KN becomes of great relevance for nuclear astrophysics. …”
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546
The Stellar 72Ge(n, γ) Cross Section for weak s-process: A First Measurement at n_TOF
Published 2023-01-01“…The experiment, data analysis and the new MACS results will be presented including their impact on stellar nucleosynthesis, which was investigated using the post-processing nucleosynthesis code mppnp for a 25 solar mass model.…”
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547
The puzzle of suppression of nuclear level density in N ≈ Z Zn isotopes compared to N > Z
Published 2024-12-01“…A significant reduction of level density for nuclei situated away from the stability line could have critical implications for the calculation of astrophysical reaction rates pertinent to heavy-element nucleosynthesis.…”
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548
Early Universe Thermodynamics and Evolution in Nonviscous and Viscous Strong and Electroweak Epochs: Possible Analytical Solutions
Published 2021-02-01“…These results obviously help in improving our understanding of the nucleosynthesis and the cosmological large-scale structure.…”
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549
Revisiting Near-infrared Features of Kilonovae: The Importance of Gadolinium
Published 2025-01-01“…The observation of the kilonova AT2017gfo and investigations of its light curves and spectra confirmed that neutron star mergers are sites of r -process nucleosynthesis. However, the identification of elements responsible for the spectral features is still challenging, particularly at the near-infrared wavelengths. …”
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550
Updated Observing Scenarios and Multimessenger Implications for the International Gravitational-wave Networks O4 and O5
Published 2023-01-01“…While no confirmed kilonovae were identified in conjunction with any of these events, continued improvements of analyses surrounding GW170817 allow us to project constraints on the Hubble Constant ( H _0 ), the Galactic enrichment from r -process nucleosynthesis, and ultra-dense matter possible from forthcoming events. …”
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551
Study of decay properties for Ba to Nd nuclei relevant for the formation of the r-process rare-earth peak (A∼160)
Published 2023-01-01“…In addition to improving predictions of nucleosynthesis models that describe the production of the rare-earth peak at A ∼ 160 via the r-process, these additional experimental data should help to constrain theoretical models for calculations of T1/2 and Pxn in this region.…”
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552
The X-Ray Luminous Type Ibn SN 2022ablq: Estimates of Preexplosion Mass Loss and Constraints on Precursor Emission
Published 2024-01-01“…We conclude that our observations disfavor a Wolf–Rayet star progenitor losing He-rich material via stellar winds and instead favor lower-mass progenitor models, including Roche-lobe overflow in helium stars with compact binary companions or stars that undergo eruptive outbursts during late-stage nucleosynthesis stages.…”
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553
RIB induced reactions: Studying astrophysical reactions with low-energy RI beam at CRIB
Published 2023-01-01“…One is for the neutron-induced destruction reactions of 7Be in the Big-Bang nucleosynthesis, and the other is the study on the 22Mg(α, p) reaction relevant in X-ray bursts, which was performed with the resonant scattering method from the inverse reaction channel.…”
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554
Measurement of the $$ ^{181} $$ 181 Ta( $$n,\gamma $$ n , γ ) cross sections up to stellar s-process temperatures at the CSNS Back-n
Published 2023-08-01“…For the characteristic thermal energy of an astrophysical site, at kT = 30keV the MACS value of $$^{181}$$ 181 Ta is 834 ± 75 mb, which shows an obvious discrepancy with the Karlsruhe Astrophysical Database of Nucleosynthesis in Stars (KADoNiS) recommended value 766 ± 15 mb. …”
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555
Cerium Features in Kilonova Near-infrared Spectra: Implication from a Chemically Peculiar Star
Published 2023-01-01“…Observations of the kilonova from the neutron star merger event GW170817 opened a way to study r -process nucleosynthesis directly using neutron star mergers. It is, however, challenging to identify individual elements in kilonova spectra due to a lack of complete atomic data, in particular at near-infrared (NIR) wavelengths. …”
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556
Experimental observation of the M1 scissors mode in 254No
Published 2022-11-01“…Our results provide a stringent test of phenomenological formulae for the scissors mode currently used in stellar nucleosynthesis calculations. We find that those formulae are not satisfactory, and we recommend using sum-rule estimates assuming a rigid-body moment of inertia instead for describing the scissors mode in superheavy nuclei.…”
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557
Early Results from GLASS–JWST. XXI. Rapid Asembly of a Galaxy at z = 6.23 Revealed by Its C/O Abundance
Published 2023-01-01“…The abundance of carbon relative to oxygen (C/O) is a promising probe of star formation history in the early universe, as the ratio changes with time due to production of these elements by different nucleosynthesis pathways. We present a measurement of $\mathrm{log}({\rm{C}}/{\rm{O}})=-1.01\pm 0.12$ (stat) ±0.15 (sys) in a z = 6.23 galaxy observed as part of the GLASS–JWST Early Release Science Program. …”
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558
Search for 22Na in novae supported by a novel method for measuring femtosecond nuclear lifetimes
Published 2023-09-01“…However, the prediction of such an observation requires good knowledge of its nucleosynthesis. The 22Na(p, γ)23Mg reaction remains the only source of large uncertainty about the amount of 22Na ejected. …”
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559
Origin of Plutonium-244 in the Early Solar System
Published 2022-06-01“…We consider two large sets of <i>r</i>-process nucleosynthesis models and analyse if the origin of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mn>244</mn></msup></semantics></math></inline-formula>Pu in the ESS is consistent with that of the other <i>r</i> and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>s</mi><mi>l</mi><mi>o</mi><mi>w</mi></mrow></semantics></math></inline-formula> (<i>s</i>) neutron-capture process radioactive nuclei. …”
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560
Shockingly Bright Warm Carbon Monoxide Molecular Features in the Supernova Remnant Cassiopeia A Revealed by JWST
Published 2024-01-01“…NIRSpec-IFU spectra (3–5.5 μ m) were obtained toward two representative knots in the NE and S fields that show very different nucleosynthesis characteristics. Both regions are dominated by the bright fundamental rovibrational band of CO in the two R and P branches, with strong [Ar vi ] and relatively weaker, variable strength ejecta lines of [Si ix ], [Ca iv ], [Ca v ], and [Mg iv ]. …”
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