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112 results on '"Grzywacz, Robert"'

1. Motivations for Early High-Profile FRIB Experiments

Author

Brown, B. Alex, Gade, Alexandra, Stroberg, S. Ragnar, Escher, Jutta, Fossez, Kevin, Giuliani, Pablo, Hoffman, Calem R., Nazarewicz, Witold, Seng, Chien-Yeah, Sorensen, Agnieszka, Vassh, Nicole, Bazin, Daniel, Brown, Kyle W., Capri, Mark A., Crawford, Heather, Danielewic, Pawel, Drischler, Christian, Ruiz, Ronald F. Garcia, Godbey, Kyle, Grzywacz, Robert, Holt, Jeremy W., Iwasaki, Hiro, Lee, Dean, Lenzi, Silvia M., Liddick, Sean, Lubna, Rebeka, Macchiavelli, Augusto O., Pinedo, Gabriel Martinez, McCoy, Anna, Mercenne, Alexis, Minamisono, Kei, Monteagudo, Belen, Navratil, Petr, Ringle, Ryan, Sargsyan, Grigor, Schatz, Hendrik, Spieker, Mark-Christoph, Volya, Alexander, Zegers, Remco G. T., Zelevinsky, Vladimir, and Zhang, Xilin

Subjects
Nuclear Theory
Abstract

This white paper is the result of a collaboration by those that attended a workshop at the Facility for Rare Isotope Beams (FRIB), organized by the FRIB Theory Alliance (FRIB-TA), on Theoretical Justifications and Motivations for Early High-Profile FRIB Experiments. It covers a wide range of topics related to the science that will be explored at FRIB. After a brief introduction, the sections address: (II) Overview of theoretical methods, (III) Experimental capabilities, (IV) Structure, (V) Near-threshold Physics, (VI) Reaction mechanisms, (VII) Nuclear equations of state, (VIII) Nuclear astrophysics, (IX) Fundamental symmetries, and (X) Experimental design and uncertainty quantification., Comment: 227 pages, 24 figures

Published
2024

2. Experimental validation of a CFD model of a ground heat exchanger with slinky coils

Author

Grzywacz Robert and Teper Mikołaj

Subjects
ground heat exchanger, cfd, experimental validation, Chemistry, QD1-999
Abstract

Rising energy prices have increased the popularity of many renewable energy sources including heat pumps. In the case of ground heat pumps research related to the analysis of the operation and selection of ground heat exchangers as a heat source are insufficient. With this in mind, on the operation of the horizontal slinky coil heat exchanger research work has been undertaken. As a research tool, the Computational Fluid Dynamics has been used. To check the adequacy of the CFD model, a validation of the model was carried out using the results of research on a real heat exchanger. Comparison was made: values of ground temperatures, outlet temperatures from the exchanger, and heat flux exchanged by the heat exchanger. In the opinion of the authors, the validation of the CFD model was successful.

Published
2024
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4. FRIB and the GW170817 Kilonova

Author

Aprahamian, A., Surman, R., Frebel, A., McLaughlin, G. C., Arcones, A., Balantekin, A. B., Barnes, J., Beers, Timothy C., Holmbeck, Erika M., Yoon, Jinmi, Brodeur, Maxime, Sprouse, T. M., Vassh, Nicole, Cizewski, Jolie A., Clark, Jason A., Cote, Benoit, Couch, Sean M., Eichler, M., Engel, Jonathan, Ezzeddine, Rana, Fuller, George M., Giuliani, Samuel A., Grzywacz, Robert, Han, Sophia, Horowitz, C. J., Kankainen, Anu, Korobkin, Oleg, Kwiatkowski, A. A., Lawler, J. E., Lippuner, Jonas, Litvinova, Elena, Mathews, G. J., Mumpower, M. R., Naimi, S., Nazarewicz, W., O'Connor, Evan, O'Shea, Brian W., Perego, Albino, Perdikakis, G., Radice, David, Richers, Sherwood, Roberts, Luke F., Robin, Caroline, Roederer, Ian U., Siegel, Daniel M., Schunck, Nicolas, Spyrou, A., and Zhu, Yong-Lin

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics, Nuclear Theory
Abstract

In July 2018 an FRIB Theory Alliance program was held on the implications of GW170817 and its associated kilonova for r-process nucleosynthesis. Topics of discussion included the astrophysical and nuclear physics uncertainties in the interpretation of the GW170817 kilonova, what we can learn about the astrophysical site or sites of the r process from this event, and the advances in nuclear experiment and theory most crucial to pursue in light of the new data. Here we compile a selection of scientific contributions to the workshop, broadly representative of progress in r-process studies since the GW170817 event., Comment: Proceedings for the FRIB Theory Alliance workshop "FRIB and the GW170817 kilonova", held 16-27 July 2018 at the Facility for Rare Isotope Beams, Michigan State University, East Lansing, MI USA; 44 pages, 14 figures

Published
2018

7. Improved data for isotopes in the decay chain of super heavy nucleus 283Cn

Author

Ibadullayev, Dastan, primary, Utyonkov, Vladimir K., additional, Oganessian, Yury Ts., additional, Abdullin, Farid Sh., additional, Dmitriev, Sergey N., additional, Itkis, Mikhail G., additional, Karpov, Alexander V., additional, Kovrizhnykh, Nikita D., additional, Kuznetsov, Dmitriy A., additional, Petrushkin, Oleg V., additional, Podshibiakin, Alexander V., additional, Polyakov, Alexander N., additional, Popeko, Andrey G., additional, Sagaidak, Roman N., additional, Schlattauer, Leo, additional, Shubin, Vladimir D., additional, Shumeiko, Maxim V., additional, Solovyev, Dmitriy I., additional, Tsyganov, Yury S., additional, Voinov, Alexey A., additional, Subbotin, Vladimir G., additional, Bodrov, Alexander Yu., additional, Sabel’nikov, Alexey V., additional, Lindner, Antonin, additional, Rykaczewski, Krzysztof P., additional, King, Thomas T., additional, Roberto, James B., additional, Brewer, Nathan T., additional, Grzywacz, Robert K., additional, Gan, Zaiguo, additional, Zhang, Zhiyuan, additional, Huang, Minghui, additional, and Yang, Huabin, additional

Published
2024
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10. Orbital dependent nucleonic pairing in the lightest known isotopes of tin

Author

Darby, Iain G., Grzywacz, Robert K., Batchelder, Jon C., Bingham, Carrol R., Cartegni, Lucia, Gross, Carl J., Hjorth-Jensen, Morten, Joss, David T., Liddick, Sean N., Nazarewicz, Witold, Padgett, Stephen, Page, Robert D., Papenbrock, Thomas, Rajabali, Mustafa M., Rotureau, Jimmy, and Rykaczewski, Krzysztof P.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

By studying the 109Xe-->105Te-->101Sn superallowed alpha-decay chain, we observe low-lying states in 101Sn, the one-neutron system outside doubly magic 100Sn. We find that the spins of the ground state (J = 7=2) and first excited state (J = 5=2) in 101Sn are reversed with respect to the traditional level ordering postulated for 103Sn and the heavier tin isotopes. Through simple arguments and state-of-the-art shell model calculations we explain this unexpected switch in terms of a transition from the single-particle regime to the collective mode in which orbital-dependent pairing correlations, dominate., Comment: 5 pages 3 figures

Published
2010
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11. $\beta$-decay spectroscopy with laser-polarised beams of neutron-rich potassium isotopes

Author

Piersa-Siłkowska, Monika, Madurga, Miguel, Kowalska, Magdalena, Azaryan, Nikolay, Baranowski, Mikołaj, Bissell, Mark, Chojnacki, Mateusz, Christie, James, Fijałkowska, Aleksandra, Grzywacz, Robert, Jankowski, Marcus, Korgul, Agnieszka, Lică, Razvan, Michelon, Ilaria, Mihai, Constantin, Pešek, Michael, Stryjczyk, Marek, Treczoks, Tobias, Xu, Zhengyu, Solak, Krzysztof, and Poklepa, Wiktor

Subjects
Detectors and Experimental Techniques
Published
2023

12. A new reference database for beta-delayed neutrons

Author

Dimitriou Paraskevi, Dillmann Iris, Singh Balraj, Piksaikin Vladimir, Tain Jose-Luis, Rykaczewski Krzysztof, Algora Alejandro, Banerjee Kaushik, Borzov Ivan, Cano-Ott Daniel, Chiba Satoshi, Fallot Muriel, Foligno Daniela, Grzywacz Robert, Huang Xiaolong, Marketin Tomislav, Minato Futoshi, Mukherjee Gopal, Rasco Bertis-Charlie, Sonzogni Alejandro, and Verpelli Marco

Subjects
Physics, QC1-999
Abstract

A new database containing all available experimental and evaluated β-delayed neutron data is presented in this paper. The database is the product of an international effort coordinated by the International Atomic Energy Agency. It comprises a microscopic section including all available experimental data on beta-decay half-lives, β-delayed neutron emission probabilities and spectra, as well as new systematics and global theoretical calculations for comparison. The beta-delayed neutron data for individual precursors have been benchmarked against available data on macroscopic properties such as total delayed-neutron yields and spectra, delayed-neutron decay curves and time-dependent group parameters using the summation method. All available measured macroscopic data have also been compiled in the macroscopic section of the database. The dedicated database is available online on the IAEA server (URL:http://www-nds.iaea.org/beta-delayed-neutron/database.html).

Published
2020
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14. Probing Optimal Reaction Energy for Synthesis of Element 119 from 51V+248Cm Reaction with Quasielastic Barrier Distribution Measurement

Author

Tanaka, Masaomi, primary, Brionnet, Pierre, additional, Du, Miting, additional, Ezold, Julie, additional, Felker, Kevin, additional, Gall, Benoît J.P., additional, Go, Shintaro, additional, Grzywacz, Robert K., additional, Haba, Hiromitsu, additional, Hagino, Kouichi, additional, Hogle, Susan, additional, Ishizawa, Satoshi, additional, Kaji, Daiya, additional, Kimura, Sota, additional, King, Thomas T., additional, Komori, Yukiko, additional, Lemon, Raiden K., additional, Leonard, Milan G., additional, Morimoto, Kouji, additional, Morita, Kosuke, additional, Nagae, Daisuke, additional, Naito, Natsuki, additional, Niwase, Toshitaka, additional, Rasco, Bertis C., additional, Roberto, James B., additional, Rykaczewski, Krzysztof P., additional, Sakaguchi, Satoshi, additional, Sakai, Hideyuki, additional, Shigekawa, Yudai, additional, Stracener, Daniel W., additional, VanCleve, Shelley, additional, Wang, Yang, additional, Washiyama, Kouhei, additional, and Yokokita, Takuya, additional

Published
2022
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19. Neutron emission from unbound states in 135Sn

Author

Grzywacz, Robert, Korgul, A, Madurga, M, Fraile, L M, Xu, Z, Piersa-Siłkowska, M, Benito, J, Algora, A, Allmond, J M, Bardayan, D, Bielak, P, Fijałkowska, A, Gaffney, L P, Guadilla, V, Heideman, J, Henrich, C, Neupane, S, King, T T, Kitamura, N, Koszuk, Ł, García Borge, M J, Illana, A, Janas, Z, Jones, K L, Kankainen, A, Karny, K, Kawano, T, Kolos, K, Kröll, T, Lama, A, Lică, R, Llanos, M, Morales, A I, Mazzocchi, C, Mihai, C, Miernik, K, Murias, J R, Orrigo, S E A, Page, R D, Podolyák, Zs, Poklepa, W, Rasco, B C, Rajabali, M M, Rubio, B, Rudigier, M, Rykaczewski, K, Siegl, K, Singh, M, Stepaniuk, M, Stryjczyk, M, Solak, K, Sotty, C, Tengblad, O, Tresckow, M, Warr, N, Wimmer, K, DeWitte, H, and Yokoyama, R

Subjects
Detectors and Experimental Techniques
Published
2021

20. Beta-strength and anti-neutrino spectra from total absorption spectroscopy of a decay chain 142Cs→142Ba→142La

Author

Wolińska-Cichocka Marzena, Rasco B. Charles, Rykaczewski Krzysztof P., Brewer Nathan T., Stracener Daniel, Grzywacz Robert, Gross Carl J., kowska Aleksandra Fijał, Goetz K. Callie, Karny Marek, King Toby, Go Shintaro, McCutchan Elizabeth A., Nesaraja Caroline, Sonzogni Alejandro A., Wang Enhong, Winger Jeff A., Xiao Yongchi, Zachary Christopher J., and Zganjar Edward F.

Subjects
Physics, QC1-999
Abstract

Beta decays of mass A = 142 isobaric chain starting from 142Cs have been investigated by means of Modular Total Absorption Spectrometer (MTAS) and on-line mass separation at Oak Ridge National Laboratory. The beta strength distribution derived for 142Cs decay from MTAS spectra is showing significant differences in β-feeding pattern when compared to the values listed at nuclear databases. MTAS results are shifting the associated anti-neutrino energy spectrum towards lower energies. A decay pattern deduced for 142Ba is similar to earlier reported results.

Published
2017
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22. Probing Optimal Reaction Energy for Synthesis of Element 119 from 51V+248Cm Reaction with Quasielastic Barrier Distribution Measurement.

Author

Masaomi Tanaka, Brionnet, Pierre, Miting Du, Ezold, Julie, Felker, Kevin, Gall, Benoît J. P., Shintaro Go, Grzywacz, Robert K., Hiromitsu Haba, Kouichi Hagino, Hogle, Susan, Satoshi Ishizawa, Daiya Kaji, Sota Kimura, King, Thomas T., Yukiko Komori, Lemon, Raiden K., Leonard, Milan G., Kouji Morimoto, and Kosuke Morita

Abstract

The quasielastic barrier distribution of 51V+248Cm was extracted by measuring the excitation function of quasielastic backscattering using a gas-filled recoil ion separator, GARIS-III. The obtained barrier distribution is well explained by the coupled-channels calculation, indicating a significant effect of the rotational excitation of deformed 248Cm. From the measured average Coulomb barrier height and deformation parameters of 248Cm, the side-collision energy leading to a compact configuration of colliding nuclei was obtained. The relation between the side collision energy and the excitation function of the evaporation-residue cross sections in the 48Ca+248Cm system was evaluated as a reference for the 51V+248Cm case. The optimal reaction energy to synthesize a new element 119 at the 51V+248Cm fusion reaction (3n and 4n channels) was estimated with an aid of these experimental data. [ABSTRACT FROM AUTHOR]

Published
2022
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29. NICOLE Collaboration Status Report

Author

Nikolov Jovana, University of Novi Sad Serbia, Ohtsubo Takahashi, University of Niigata Japan, Grzywacz Robert, University of Tennessee Knoxville USA, Madurga Miguel, University of Tennessee Knoxville USA, Stone Nicholas, University of Tennessee Knoxville USA, Stone Rikovska Jirina, University of Tennessee Knoxville USA, Gaulard Carole, CSNSM Université Paris Sud France, Roccia Stephanie, CSNSM Université Paris Sud France and ILL Grenoble, Koester Ulli, ILL Grenoble, and Walters William, University of Maryland College Park USA

Subjects
Detectors and Experimental Techniques
Published
2019

30. Strong one-neutron emission from two-neutron unbound states in Beta decays of the r-process nuclei 86,87 Ga

Author

Yokoyama, R., Grzywacz, Robert, Rasco, B. Charles, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, and Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group

Subjects
Energies::Energia nuclear [Àrees temàtiques de la UPC], Neutrons, RIKEN, Física [Àrees temàtiques de la UPC], Nuclear physics, BRIKEN, Beta decay, Física nuclear, Neutron, Delayed neutrons
Abstract

Aquesta és una còpia de la versió author’s final draft d'un article publicat a la revista [Physical Review C ]. URL d'aquest document a UPCommons E-prints: http://hdl.handle.net/2117/174873 Beta-delayed one-neutron and two-neutron branching ratios (P1n and P2n) have been measured in the decay of A = 84 to 87 Ga isotopes at the Radioactive-Isotope Beam Factory (RIBF) at the RIKEN Nishina Center using a high-efficiency array of 3He neutron counters (BRIKEN). Two-neutron emission was observed in the decay of 84,85,87Ga for the first time and the branching ratios were measured to be P2n = 1.6(2)%, 1.3(2)%, and 10.2(28)stat(5)sys%, respectively. One-neutron branching ratio of 87Ga (P1n = 81(9)stat(8)sys%) and half-life of 29(4) ms were measured for the first time. The branching ratios of 86Ga were also measured to be P1n = 74(2)stat(8)sys% and 16.2(9)stat(6)sys% with better precision than a previous study. The observation that P1n > P2n for both 86,87Ga was unexpected and is interpreted as a signature of dominating one-neutron emission from the two-neutron unbound excited states in 86,87Ge. In order to interpret the experimental results, shell-model and Hauser-Feshbach statistical model calculations of delayed particle and ¿ -ray emission probabilities were performed. This model framework reproduces the experimental results. The shell model alone predicts P2n significantly larger than P1n for the 87Ga decay, and it is necessary to invoke a statistical description to successfully explain the observation that P1n > P2n. Our new results demonstrate the relevance and importance of a statistical description of neutron emission for the prediction of the decay properties of multineutron emitters and that it must be included in the r-process modeling.

Published
2019

31. Strong one-neutron emission from two-neutron unbound states in Beta decays of the r-process nuclei 86,87 Ga

Author

Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Yokoyama, R., Grzywacz, Robert, Rasco, B. Charles, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, Tarifeño Saldivia, Ariel Esteban, Universitat Politècnica de Catalunya. Departament de Física, Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. ANT - Advanced Nuclear Technologies Research Group, Yokoyama, R., Grzywacz, Robert, Rasco, B. Charles, Calviño Tavares, Francisco, Cortés Rossell, Guillem Pere, and Tarifeño Saldivia, Ariel Esteban

Abstract

Aquesta és una còpia de la versió author’s final draft d'un article publicat a la revista [Physical Review C ]. URL d'aquest document a UPCommons E-prints: http://hdl.handle.net/2117/174873, Beta-delayed one-neutron and two-neutron branching ratios (P1n and P2n) have been measured in the decay of A = 84 to 87 Ga isotopes at the Radioactive-Isotope Beam Factory (RIBF) at the RIKEN Nishina Center using a high-efficiency array of 3He neutron counters (BRIKEN). Two-neutron emission was observed in the decay of 84,85,87Ga for the first time and the branching ratios were measured to be P2n = 1.6(2)%, 1.3(2)%, and 10.2(28)stat(5)sys%, respectively. One-neutron branching ratio of 87Ga (P1n = 81(9)stat(8)sys%) and half-life of 29(4) ms were measured for the first time. The branching ratios of 86Ga were also measured to be P1n = 74(2)stat(8)sys% and 16.2(9)stat(6)sys% with better precision than a previous study. The observation that P1n > P2n for both 86,87Ga was unexpected and is interpreted as a signature of dominating one-neutron emission from the two-neutron unbound excited states in 86,87Ge. In order to interpret the experimental results, shell-model and Hauser-Feshbach statistical model calculations of delayed particle and ¿ -ray emission probabilities were performed. This model framework reproduces the experimental results. The shell model alone predicts P2n significantly larger than P1n for the 87Ga decay, and it is necessary to invoke a statistical description to successfully explain the observation that P1n > P2n. Our new results demonstrate the relevance and importance of a statistical description of neutron emission for the prediction of the decay properties of multineutron emitters and that it must be included in the r-process modeling., Postprint (author's final draft)

Published
2019

49. THE DUMPING OF OSCILLATORY PHENOMENA IN THE PROCESS OF BIOETHANOL PRODUCTION BY CONTINUOUS FERMENTATION.

Author

Ciesielski, Adrian and Grzywacz, Robert

Subjects
ETHANOL as fuel, MANUFACTURING processes, NUMERICAL calculations, FERMENTATION, NUMERICAL analysis, OSCILLATIONS, FOOD fermentation
Abstract

Copyright of Technical Transactions / Czasopismo Techniczne is the property of Sciendo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2019
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50. $\beta$-delayed neutron spectroscopy of $^{130-132}$Cd isotopes with the ISOLDE decay station and the VANDLE array

Author

Madurga Flores, Miguel, Grzywacz, Robert, Kolos, K, Bardayan, D, Borge, M J G, Brewer, N T, Cocolios, T E, Cizewski, J A, Dillman, I, Fijalkowska, A, Fraile, L M, Gross, C J, Goetz, K C, Ilyushkin, S V, Mazzocchi, C, Manning, B, Miernik, K, Miller, D, Paulauskas, S V, Peters, W A, Ratkiewicz, A, Rykaczewski, K P, Taylor, S, Tengblad, O, Sotty, C, De Witte, H, and Xiao, Y

Subjects
Detectors and Experimental Techniques
Published
2014

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