Showing 601 - 620 results of 673 for search '"nucleosynthesis"', query time: 0.18s Refine Results
  1. 601

    Fractional yields inferred from halo and thick disk stars by Caimmi R.

    Published 2013-01-01
    “…Hence, the fractional yields, ^pQ/^pO, are determined and (as an example) a comparison is shown with their theoretical counterparts inferred from SNII progenitor nucleosynthesis under the assumption of a power-law stellar initial mass function. …”
    Get full text
    Article
  2. 602

    METAL-POOR STARS OBSERVED WITH THE MAGELLAN TELESCOPE. III. NEW EXTREMELY AND ULTRA METAL-POOR STARS FROM SDSS/SEGUE AND INSIGHTS ON THE FORMATION OF ULTRA METAL-POOR STARS by Placco, Vinicius M., Lee, Young Sun, Beers, Timothy C., Pena, Jose M., Chan, Conrad, Heger, Alexander, Frebel, Anna L., Jacobson, Heather

    Published 2015
    “…We also provide new insights on the formation of the UMP stars, based on comparisons with a new set of theoretical models of supernovae (SNe) nucleosynthesis. The models were matched with 20 UMP stars found in the literature, together with one of the program stars (SDSS J1204+1201), with [Fe/H] = -4.34. …”
    Get full text
    Get full text
    Get full text
    Article
  3. 603

    R-process enrichment from a single event in an ancient dwarf galaxy by Simon, Joshua D., Ji, Alexander Pung, Frebel, Anna L., Chiti, Anirudh

    Published 2017
    “…The smaller, chemically simpler, and more ancient ultrafaint dwarf galaxies assembled shortly after the first stars formed, and are ideal systems with which to study nucleosynthesis events such as the r-process. Reticulum II is one such galaxy. …”
    Get full text
    Get full text
    Get full text
    Get full text
    Article
  4. 604

    From Actinides to Zinc: Using the Full Abundance Pattern of the Brightest Star in Reticulum II to Distinguish between Different by Ji, Alexander P., Frebel, Anna L.

    Published 2018
    “…We compare the detailed abundance pattern to predictions from nucleosynthesis calculations of NSMs and magnetorotationally driven jet supernovae, finding that nuclear physics uncertainties dominate over astrophysical uncertainties. …”
    Get full text
    Get full text
    Article
  5. 605

    The R-process alliance: discovery of the first metal-poor star with a combined r- and s-process element signature by Gull, Maude, Frebel, Anna, Cain, Madelyn G., Ji, Alexander P., Ezzeddine, Rana

    Published 2020
    “…Thorium is also detected, as expected from an r-process origin, as Th is not produced in the s-process. We employ nucleosynthesis model predictions that take an initial r-process enhancement into account, and then determine the mass transfer of carbon and s-process material from a putative more massive companion onto the observed star. …”
    Get full text
    Article
  6. 606

    Dynamically Tagged Groups of Very Metal-poor Halo Stars from the HK and Hamburg/ESO Surveys by Limberg, Guilherme, Rossi, Silvia, Beers, Timothy C, Perottoni, Hélio D, Pérez-Villegas, Angeles, Santucci, Rafael M, Abuchaim, Yuri, Placco, Vinicius M, Lee, Young Sun, Christlieb, Norbert, Norris, John E, Bessell, Michael S, Ryan, Sean G, Wilhelm, Ronald, Rhee, Jaehyon, Frebel, Anna

    Published 2022
    “…Taken as a whole, these results are consistent with ultra-faint and/or dwarf spheroidal galaxies as birth environments in which r-process nucleosynthesis took place, and then were disrupted by the Milky Way.…”
    Get full text
    Article
  7. 607

    THE BEST AND BRIGHTEST METAL-POOR STARS by Casey, Andrew R., Schlaufman, Kevin C

    Published 2015
    “…The chemical abundances of large samples of extremely metal-poor (EMP) stars can be used to investigate metal-free stellar populations, supernovae, and nucleosynthesis as well as the formation and galactic chemical evolution of the Milky Way and its progenitor halos. …”
    Get full text
    Get full text
    Article
  8. 608

    The VLT-FLAMES Tarantula Survey: XXV. Surface nitrogen abundances of O-type giants and supergiants by Grin, N, Ramírez-Agudelo, O, de Koter, A, Sana, H, Puls, J, Brott, I, Crowther, P, Dufton, P, Evans, C, Gräfener, G, Herrero, A, Langer, N, Lennon, D, van Loon, J, Markova, N, , d, Najarro, F, Schneider, F, Taylor, W, Tramper, F, Vink, J, Walborn, N

    Published 2017
    “…Theoretically, rotation-induced chemical mixing in massive stars has far reaching evolutionary consequences, affecting the sequence of morphological phases, lifetimes, nucleosynthesis, and supernova characteristics. Aims. …”
    Journal article
  9. 609

    NINE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE (WMAP) OBSERVATIONS: FINAL MAPS AND RESULTS by Bennett, C, Larson, D, Weiland, J, Jarosik, N, Hinshaw, G, Odegard, N, Smith, K, Hill, R, Gold, B, Halpern, M, Komatsu, E, Nolta, MR, Page, L, Spergel, D, Wollack, E, Dunkley, J, Kogut, A, Limon, M, Meyer, S, Tucker, G, Wright, E

    Published 2013
    “…When WMAP data are combined with finer scale CMB, baryon acoustic oscillation, and Hubble constant measurements, we find that big bang nucleosynthesis is well supported and there is no compelling evidence for a non-standard number of neutrino species (N eff = 3.84 ± 0.40). …”
    Journal article
  10. 610

    From SuperTIGER to TIGERISS by B. F. Rauch, W. V. Zober, Q. Abarr, Y. Akaike, W. R. Binns, R. F. Borda, R. G. Bose, T. J. Brandt, D. L. Braun, J. H. Buckley, N. W. Cannady, S. Coutu, R. M. Crabill, P. F. Dowkontt, M. H. Israel, M. Kandula, J. F. Krizmanic, A. W. Labrador, W. Labrador, L. Lisalda, J. V. Martins, M. P. McPherson, R. A. Mewaldt, J. G. Mitchell, J. W. Mitchell, S. A. I. Mognet, R. P. Murphy, G. A. de Nolfo, S. Nutter, M. A. Olevitch, N. E. Osborn, I. M. Pastrana, K. Sakai, M. Sasaki, S. Smith, H. A. Tolentino, N. E. Walsh, J. E. Ward, D. Washington, A. T. West, L. P. Williams

    Published 2024-01-01
    “…Extended single-element resolution UHGCR measurements through <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mrow></mrow><mn>82</mn></msub></semantics></math></inline-formula>Pb will cover elements produced in s-process and r-process neutron capture nucleosynthesis, adding to the multi-messenger effort to determine the relative contributions of supernovae (SNe) and Neutron Star Merger (NSM) events to the r-process nucleosynthesis product content of the galaxy.…”
    Get full text
    Article
  11. 611

    Collapse of Rotating Massive Stars Leading to Black Hole Formation and Energetic Supernovae by Sho Fujibayashi, Yuichiro Sekiguchi, Masaru Shibata, Shinya Wanajo

    Published 2023-01-01
    “…The explosion energy is still increasing at the end of the simulations with a rate of >10 ^50 erg s ^−1 , and thus, it may reach ∼10 ^52 erg. A nucleosynthesis calculation shows that the mass of ^56 Ni amounts to ≳0.1 M _⊙ , which, together with the high explosion energy, may satisfy the required amount for broad-lined type Ic supernovae. …”
    Get full text
    Article
  12. 612

    Experimental study of 37Cl(α,n)40K reaction in order to constrain the reaction rate of destruction of 40K in stars by Dimitrakopoulos Nikolaos, Perdikakis Georgios, Tsintari Pelagia, Brune Carl R., Massey Thomas N., Meisel Zach, Voinov Alexander, Ingram David C., Gastis Panos, Jones-Alberty Yenuel, Subedi Shiv K., Warren Justin, Brandenburg Kristyn H., Singh Nisha, Ulbrich Lauren P.

    Published 2023-01-01
    “…This study aims to constrain the 40K(n,α)37Cl reaction rate, one of the two major destruction paths of 40K in stellar nucleosynthesis,by measuring the reverse reaction 37Cl(α,n)40K and applying the principle of detailed balance as we have done before for the 40K (40K(n,p)40Ar reaction rate) [2]. …”
    Get full text
    Article
  13. 613

    Proposed Lunar Measurements of r-Process Radioisotopes to Distinguish the Origin of Deep-sea 244Pu by Xilu Wang, Adam M. Clark, John Ellis, Adrienne F. Ertel, Brian D. Fields, Brian J. Fry, Zhenghai Liu, Jesse A. Miller, Rebecca Surman

    Published 2023-01-01
    “…. ^244 Pu is among the heaviest r -process products, and we consider whether it was created in supernovae, which is disfavored by nucleosynthesis simulations, or in an earlier kilonova event that seeded the nearby interstellar medium with ^244 Pu that was subsequently swept up by the supernova debris. …”
    Get full text
    Article
  14. 614

    Modeling space-resolved ion dynamics in ECR plasmas for predicting in-plasma β-decay rates by Bharat Mishra, Bharat Mishra, Alessio Galatà , Angelo Pidatella , Sándor Biri , Giorgio Sebastiano Mauro , Eugenia Naselli , Richárd Rácz , Giuseppe Torrisi , David Mascali 

    Published 2022-10-01
    “…Accurate knowledge of the relation between plasma parameters and nuclear decay rates are essential for reducing uncertainties in present nucleosynthesis models, and this is precisely the aim of the PANDORA experiment. …”
    Get full text
    Article
  15. 615

    The Black Hole Universe, Part II by Enrique Gaztanaga

    Published 2022-09-01
    “…If our Universe formed this way, there is no need for Cosmic Inflation or a singular start (the Big Bang). Nucleosynthesis and recombination follow a hot expansion, as in the standard model, but cosmological measurements (which are free parameters in the standard model) could in principle be predicted from first principles. …”
    Get full text
    Article
  16. 616

    Imprint of pairing correlation in (n, γ) and Maxwellian-averaged cross sections of an odd-odd 166Ho nucleus by Le Tan Phuc, Tran Vu Dong, Nguyen Dinh Dang, Bui Minh Hue, Le Thi Quynh Huong, Balaram Dey, Nguyen Ngoc Anh, Nguyen Quang Hung

    Published 2024-02-01
    “…Utilizing the obtained NLD and RSF, we predict the 165Ho(n,γ)166Ho and Maxwellian-averaged cross sections, which exhibit remarkable agreement with all the available experimental data from the Experimental Nuclear Reaction Data and Karlsruhe Astrophysical Database of Nucleosynthesis in Stars. These results reflect the imprint of the pairing correlation on those quantities.…”
    Get full text
    Article
  17. 617

    Fusion measurements of 12C+12C at energies of astrophysical interest by Santiago-Gonzalez D., Jiang C.L., Rehm K.E., Alcorta M., Almaraz-Calderon S., Avila M.L., Ayangeakaa A.D., Back B.B., Bourgin D., Bucher B., Carpenter M.P., Courtin S., David H.M., Deibel C.M., Dickerson C., DiGiovine B., Fang X., Greene J.P., Haas F., Henderson D.J., Janssens R.V.F., Jenkins D., Lai J., Lauritsen T., Lefebvre-Schuhl A., Montanari D., Pardo R.C., Paul M., Seweryniak D., Tang X.D., Ugalde C., Zhu S.

    Published 2016-01-01
    “…The cross section of the 12C+12C fusion reaction at low energies is of paramount importance for models of stellar nucleosynthesis in different astrophysical scenarios, such as Type Ia supernovae and Xray superbursts, where this reaction is a primary route for the production of heavier elements. …”
    Get full text
    Article
  18. 618

    Detection of Metal Enrichment by SN 2011jm in NGC 4809 by Yulong Gao, Qiusheng Gu, Ping Zhou, Yong Shi, Xiangdong Li

    Published 2024-01-01
    “…Cosmic metals are believed to originate from stellar and supernovae (SNe) nucleosynthesis, dispersed into the interstellar medium (ISM) through stellar winds and supernova explosions. …”
    Get full text
    Article
  19. 619

    SD 1313–0019: ANOTHER SECOND-GENERATION STAR WITH [Fe/H] = −5.0, OBSERVED WITH THE MAGELLAN TELESCOPE by Chiti, Anirudh, Placco, Vinicius M., Frebel, Anna L., Ji, Alexander Pung, Jacobson, Heather

    Published 2015
    “…This ever-increasing population of carbon-rich, iron-deficient stars can potentially constrain nucleosynthesis in Population III stars and their supernova explosions, the formation mechanisms of the first low-mass stars, and the nature of the first galaxies.…”
    Get full text
    Get full text
    Get full text
    Get full text
    Get full text
    Article
  20. 620

    THE CHEMICAL ABUNDANCES OF STARS IN THE HALO (CASH) PROJECT. III. A NEW CLASSIFICATION SCHEME FOR CARBON-ENHANCED METAL-POOR STARS WITH s-PROCESS ELEMENT ENHANCEMENT by Hollek, Julie K., Placco, Vinicius M., Karakas, Amanda I., Shetrone, Matthew, Sneden, Christopher, Christlieb, Norbert, Frebel, Anna L.

    Published 2016
    “…Based on abundance comparisons with asymptotic giant branch (AGB) star nucleosynthesis models, we suggest a new physically motivated origin and classification scheme for CEMP-s stars and the still poorly understood CEMP-r/s. …”
    Get full text
    Get full text
    Article