Showing 541 - 560 results of 568 for search '"nucleosynthesis"', query time: 0.16s Refine Results
  1. 541

    Interstellar Nitrogen Isotope Ratios: Measurements on Tracers of C14N and C15N by J. L. Chen, J. S. Zhang, C. Henkel, Y. T. Yan, H. Z. Yu, Y. X. Wang, Y. P. Zou, J. Y. Zhao, X. Y. Wang

    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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    Article
  2. 542

    Transition Probabilities of Near-infrared Ce iii Lines from Stellar Spectra: Applications to Kilonovae by Nanae Domoto, Jae-Joon Lee, Masaomi Tanaka, Ho-Gyu Lee, Wako Aoki, Miho N. Ishigaki, Shinya Wanajo, Daiji Kato, Kenta Hotokezaka

    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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    Article
  3. 543

    On Low Hubble Expansion Rate from Planck Data Anomalies by Abraão J. S. Capistrano, Luís A. Cabral, Carlos H. Coimbra-Araújo, José A. P. F. Marão

    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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  4. 544

    Ionized-gas Metallicity of the Strong [O iii]λ5007 Emission-line Compact Galaxies in the LAMOST Survey by Siqi Liu, A-Li Luo, Wei Zhang, Xiao Kong, Yan-Xia Zhang, Shi-Yin Shen, Yong-Heng Zhao

    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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  5. 545
  6. 546

    The Stellar 72Ge(n, γ) Cross Section for weak s-process: A First Measurement at n_TOF by Dietz M., Lederer-Woods C., Tattersall A., Battino U., Gunsing F., Heinitz S., Lerendegui-Marco J., Krtička M., Reifarth R., Valenta S., Aberle O., Amaducci S., Andrzejewski J., Audouin L., Bacak M., Balibrea J., Barbagallo M., Bečvář F., Berthoumieux E., Billowes J., Bosnar D., Brown A., Caamaño M., Calviño F., Calviani M., Cano-Ott D., Cardella R., Casanovas A., Cerutti F., Chen Y. H., Chiaveri E., Colonna N., Cortés G., Cortés-Giraldo M. A., Cosentino L., Damone L. A., Diakaki M., Domingo-Pardo C., Dressler R., Dupont E., Durán I., Fernández-Domínguez B., Ferrari A., Ferreira P., Finocchiaro P., Göbel K., García A. R., Gawlik-Ramie˛ga A., Gilardoni S., Glodariu† T., Gonçalves I. F., González-Romero E., Griesmayer E., Guerrero C., Harada H., Heyse J., Jenkins D. G., Jericha E., Käppeler† F., Kadi Y., Kahl D., Kalamara A., Kavrigin P., Kimura A., Kivel N., Kokkoris M., Krtička M., Kurtulgil D., Leal-Cidoncha E., Leeb H., Lo Meo S., Lonsdale S. J., Macina D., Manna A., Marganiec J., Martínez T., Masi A., Massimi C., Mastinu P., Mastromarco M., Maugeri E. A., Mazzone A., Mendoza E., Mengoni A., Milazzo P. M., Mingrone F., Musumarra A., Negret A., Nolte R., Oprea A., Patronis N., Pavlik A., Perkowski J., Porras I., Praena J., Quesada J. M., Radeck D., Rauscher T., Rubbia C., Ryan J. A., Sabaté-Gilarte M., Saxena A., Schillebeeckx P., Schumann D., Smith A. G., Sosnin N. V., Stamatopoulos A., Tagliente G., Tain J. L., Tarifeño-Saldivia A., Tassan-Got L., Vannini G., Variale V., Vaz P., Ventura A., Vlachoudis V., Vlastou R., Wallner A., Warren S., Weiss C., Woods P. J., Wright T., Žugec P.

    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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  7. 547

    The puzzle of suppression of nuclear level density in N ≈ Z Zn isotopes compared to N > Z by Pratap Roy, K. Banerjee, N. Quang Hung, N. Ngoc Anh, Samir Kundu, S. Manna, A. Sen, T.K. Ghosh, T.K. Rana, G. Mukherjee, R. Pandey, S. Mukhopadhyay, Deepak Pandit, Debasish Mondal, Surajit Pal, C. Bhattacharya

    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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    Article
  8. 548

    Early Universe Thermodynamics and Evolution in Nonviscous and Viscous Strong and Electroweak Epochs: Possible Analytical Solutions by Abdel Nasser Tawfik, Carsten Greiner

    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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    Article
  9. 549

    Revisiting Near-infrared Features of Kilonovae: The Importance of Gadolinium by Salma Rahmouni, Masaomi Tanaka, Nanae Domoto, Daiji Kato, Kenta Hotokezaka, Wako Aoki, Teruyuki Hirano, Takayuki Kotani, Masayuki Kuzuhara, Motohide Tamura

    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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    Article
  10. 550

    Updated Observing Scenarios and Multimessenger Implications for the International Gravitational-wave Networks O4 and O5 by R. Weizmann Kiendrebeogo, Amanda M. Farah, Emily M. Foley, Abigail Gray, Nina Kunert, Anna Puecher, Andrew Toivonen, R. Oliver VandenBerg, Shreya Anand, Tomás Ahumada, Viraj Karambelkar, Michael W. Coughlin, Tim Dietrich, S. Zacharie Kam, Peter T. H. Pang, Leo P. Singer, Niharika Sravan

    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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    Article
  11. 551
  12. 552

    The X-Ray Luminous Type Ibn SN 2022ablq: Estimates of Preexplosion Mass Loss and Constraints on Precursor Emission by C. Pellegrino, M. Modjaz, Y. Takei, D. Tsuna, M. Newsome, T. Pritchard, R. Baer-Way, K. A. Bostroem, P. Chandra, P. Charalampopoulos, Y. Dong, J. Farah, D. A. Howell, C. McCully, S. Mohamed, E. Padilla Gonzalez, G. Terreran

    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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  13. 553
  14. 554
  15. 555

    Cerium Features in Kilonova Near-infrared Spectra: Implication from a Chemically Peculiar Star by Masaomi Tanaka, Nanae Domoto, Wako Aoki, Miho N. Ishigaki, Shinya Wanajo, Kenta Hotokezaka, Kyohei Kawaguchi, Daiji Kato, Jae-Joon Lee, Ho-Gyu Lee, Teruyuki Hirano, Takayuki Kotani, Masayuki Kuzuhara, Jun Nishikawa, Masashi Omiya, Motohide Tamura, Akitoshi Ueda

    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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    Article
  16. 556

    Experimental observation of the M1 scissors mode in 254No by F.L. Bello Garrote, A. Lopez-Martens, A.C. Larsen, I. Deloncle, S. Péru, F. Zeiser, P.T. Greenlees, B.V. Kheswa, K. Auranen, D.L. Bleuel, D.M. Cox, L. Crespo Campo, F. Giacoppo, A. Görgen, T. Grahn, M. Guttormsen, T.W. Hagen, L. Harkness-Brennan, K. Hauschild, G. Henning, R.-D. Herzberg, R. Julin, S. Juutinen, T.A. Laplace, M. Leino, J.E. Midtbø, V. Modamio, J. Pakarinen, P. Papadakis, J. Partanen, T. Renstrøm, K. Rezynkina, M. Sandzelius, J. Sarén, C. Scholey, S. Siem, J. Sorri, S. Stolze, J. Uusitalo

    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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    Article
  17. 557

    Early Results from GLASS–JWST. XXI. Rapid Asembly of a Galaxy at z = 6.23 Revealed by Its C/O Abundance by Tucker Jones, Ryan Sanders, Yuguang Chen, Xin Wang, Takahiro Morishita, Guido Roberts-Borsani, Tommaso Treu, Alan Dressler, Emiliano Merlin, Diego Paris, Paola Santini, Pietro Bergamini, A. Henry, Erin Huntzinger, Themiya Nanayakkara, Kristan Boyett, Marusa Bradac, Gabriel Brammer, Antonello Calabró, Karl Glazebrook, Kathryn Grasha, Sara Mascia, Laura Pentericci, Michele Trenti, Benedetta Vulcani

    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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    Article
  18. 558
  19. 559

    Origin of Plutonium-244 in the Early Solar System by Maria Lugaro, Andrés Yagüe López, Benjámin Soós, Benoit Côté, Mária Pető, Nicole Vassh, Benjamin Wehmeyer, Marco Pignatari

    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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  20. 560

    Shockingly Bright Warm Carbon Monoxide Molecular Features in the Supernova Remnant Cassiopeia A Revealed by JWST by J. Rho, S.-H. Park, R. Arendt, M. Matsuura, D. Milisavljevic, T. Temim, I. De Looze, W. P. Blair, A. Rest, O. Fox, A. P. Ravi, B.-C. Koo, M. Barlow, A. Burrows, R. Chevalier, G. Clayton, R. Fesen, C. Fransson, C. Fryer, H. L. Gomez, H.-T. Janka, F. Kirchschlager, J. M. Laming, S. Orlando, D. Patnaude, G. Pavlov, P. Plucinsky, B. Posselt, F. Priestley, J. Raymond, N. Sartorio, F. Schmidt, P. Slane, N. Smith, N. Sravan, J. Vink, K. Weil, J. Wheeler, S. C. Yoon

    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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