Article
Physics, Nuclear
Qu-Fei Song, Su-Yang Xu, Jun Su
Summary: A nucleon-nucleus dynamics model has been developed to investigate proton-, neutron-, and deuteron-induced reactions at hundreds of MeV/nucleon. The model calculates the trajectory of the incident nucleon using classical mechanics and the probability of reaction between the nucleon and nucleus using exponential damping. The total reaction cross sections calculated by the model agree generally with predictions by the CDCC and experimental data. The model has been applied to study nucleon stripping in deuteron-induced reactions and its dependence on symmetry energy.
Article
Medicine, General & Internal
Abena S. Agyeman, Jeffrey N. Siegel, Christopher Leptak
Summary: This article describes the considerations and approach taken when establishing a table of acceptable surrogate endpoints (SEs) by FDA, as well as the benefits and limitations of the table when used by various stakeholders.
FRONTIERS IN MEDICINE
(2022)
Article
Astronomy & Astrophysics
A. Nikolakopoulos, R. Gonzalez-Jimenez, N. Jachowicz, J. M. Udias
Summary: Pion production on nuclei is an important part of neutrino experiments. Tensions between bubble-chamber data and MINERvA experiment data indicate the presence of nuclear effects. The use of a microscopic quantum mechanical framework is needed to understand the origins of these tensions and improve the description of neutrino pion production. Measurement of cross sections for MINERvA and T2K datasets shows that including nucleon distortion reduces the cross section but doesn't significantly change the shape. The discrepancy between experimental data and theoretical predictions cannot be solely attributed to nuclear effects.
Article
Pharmacology & Pharmacy
Chaoying Ding, Marianthi Ierapetritou
Summary: A novel approach was proposed to identify the design space of continuous chromatography to balance computational complexity and model predictions. The study comprehensively examined the effects of process variables on the design space and thoroughly investigated the impact of essential factors and design variables.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2021)
Article
Chemistry, Multidisciplinary
Olga Guselnikova, Gerard Audran, Jean-Patrick Joly, Andrii Trelin, Evgeny Tretyakov, Vaclav Svorcik, Oleksiy Lyutakov, Sylvain R. A. Marque, Pavel Postnikov
Summary: The study investigates the impact of plasmonic effects on reaction kinetics using alkoxyamines as organic probes, emphasizing the dependence of kinetic parameters on the structure of organic molecules.
Article
Multidisciplinary Sciences
Charlotte Loh, Thomas Christensen, Rumen Dangovski, Samuel Kim, Marin Soljacic
Summary: Deep learning techniques often require a large amount of training data, which can be challenging in the case of scarce datasets. This study proposes a framework that combines contrastive and transfer learning to reduce the data requirements for training while maintaining prediction accuracy. By utilizing auxiliary information sources, such as unlabeled data, prior knowledge, and surrogate data, the proposed framework consistently achieves significant reductions in the number of labels needed for accurate predictions.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Nuclear
Oliver C. Gorton, Jutta E. Escher
Summary: This paper examines the validity of the Weisskopf-Ewing approximation for determining unknown (n, n') and (n, 2n) cross sections from surrogate reaction data. The study finds that the Weisskopf-Ewing approximation can estimate peak cross sections, but the shape of the (n, n') and (n, 2n) cross sections, especially for low neutron energies, cannot be reliably determined without accounting for the angular-momentum differences between the neutron-induced and surrogate reaction.
Article
Physics, Nuclear
F. Tarkanyi, S. Takacs, F. Ditroi, Z. Szucs, K. Brezovcsik, A. Hermanne, A. Ignatyuk
Summary: Deuteron induced reactions on natural bismuth targets were investigated using the stacked foil activation technique up to 50 MeV. Excitation functions for various reactions were compared with model calculations and previous measurements, with thick target yields deduced from experimental cross sections.
EUROPEAN PHYSICAL JOURNAL A
(2021)
Article
Instruments & Instrumentation
He Huang, Masayuki Aikawa, Yukina Hanada, Hiromitsu Haba
Summary: Radioisotopes in transition elements, such as 51Cr and 52gMn, are valuable for medical applications. This study measured the excitation functions of the production reactions for these radioisotopes and derived the yields of 51Cr and 52gMn by comparing the results with experimental data and predictions.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2022)
Article
Chemistry, Inorganic & Nuclear
M. Sekerci, H. Ozdogan, A. Kaplan
Summary: Scientific studies commonly rely on theoretical calculations when experimental observations are not available. This study focuses on examining the effects of different deuteron optical models on cross-section calculations of deuteron induced reactions on natural germanium, comparing the results to experimental data. The findings suggest that theoretical models, including deuteron optical models, play a significant role in nuclear physics research.
APPLIED RADIATION AND ISOTOPES
(2021)
Article
Physics, Nuclear
Donal B. Day, Leonid L. Frankfurt, Misak M. Sargsian, Mark I. Strikman
Summary: We conducted a detailed study on the conditions required for detecting elusive three-nucleon short-range correlations (3N-SRCs) in nuclei through electron scattering experiments. We derived the kinematical requirements for isolating 3N-SRCs in inclusive processes. Our analysis revealed evidence of the scaling associated with the dominance of 3N-SRCs, and the data also supported the quadratic relation between the ratios measured in the 3N and 2N-SRC regions for nuclei ranging 4 A 197. From this agreement, we were able to extract the probability of 3N-SRCs relative to the A=3 nucleus, which was found to be significantly larger than the corresponding parameter for 2N-SRCs.
Article
Astronomy & Astrophysics
Mao-Jun Yan, Manuel Pavon Valderrama
Summary: The LHCb Collaboration has recently announced the discovery of the T-cc(+) tetraquark, which is only a few hundred keV below the D*+D-0 threshold. It is expected to have a molecular component, and theoretical predictions can be made accurately due to the separation of scales. The important decay channels include D+D-0 pi(0), (DD0)-D-0 pi(+), and D+D-0 gamma. The mass and width of the T-cc(+) tetraquark depend on the resonance profile due to its closeness to threshold.
Article
Physics, Nuclear
Raj Kumar, Shilpa Rana, M. Bhuyan, P. Mohr
Summary: This study investigates the effects of different nuclear density distributions and effective nucleon-nucleon interaction potentials on the fusion cross section of He-4-induced reactions on heavy target nuclei. The results show that the relativistic R3Y NN potential folded with RMF densities provides a better fit to the experimental data.
Article
Instruments & Instrumentation
Masayuki Aikawa, Yutaka Toyoeda, Damdinsuren Gantumur, Naoyuki Ukon, Shuichiro Ebata, Hiromitsu Haba, Sandor Takacs, Ferenc Ditroi, Zoltan Szucs
Summary: Activation cross sections of deuteron-induced reactions on natural rhenium were measured. The production cross sections of various isotopes were determined and compared with experimental data and literature values.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Article
Physics, Multidisciplinary
Roman Skibinski, Jacek Golak, Henryk Witala, Vaibhav Chahar, Evgeny Epelbaum, Andreas Nogga, Volodymyr Soloviov
Summary: In this study, the nucleon-induced deuteron breakup reaction is investigated using the Faddeev approach. The theoretical uncertainties in the predicted cross section, which depend on the value of the cutoff parameter, are determined. Predictions based on different potentials are compared, and the effects of the three-nucleon force are studied. The results show that the dependence of the cross sections on the regulator cutoff is moderate at 135 MeV and much stronger at 200 MeV, with up to 45% variation in specific kinematic configurations.
FRONTIERS IN PHYSICS
(2023)
Review
Physics, Nuclear
Calvin W. Johnson, Kristina D. Launey, Naftali Auerbach, Sonia Bacca, Bruce R. Barrett, Carl Brune, Mark A. Caprio, Pierre Descouvemont, W. H. Dickhoff, Charlotte Elster, Patrick J. Fasano, Kevin Fossez, Heiko Hergert, Morten Hjorth-Jensen, Linda Hlophe, Baishan Hu, Rodolfo M. Id Betan, Andrea Idini, Sebastian Koenig, Konstantinos Kravvaris, Dean Lee, Jin Lei, Alexis Mercenne, Rodrigo Navarro Perez, Witold Nazarewicz, Filomena M. Nunes, Marek Ploszajczak, Jimmy Rotureau, Gautam Rupak, Andrey M. Shirokov, Ian Thompson, James P. Vary, Alexander Volya, Furong Xu, Remco G. T. Zegers, Vladimir Zelevinsky, Xilin Zhang
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2020)
Article
Physics, Multidisciplinary
M. Spieker, A. Heusler, B. A. Brown, T. Faestermann, R. Hertenberger, G. Potel, M. Scheck, N. Tsoneva, M. Weinert, H-F Wirth, A. Zilges
PHYSICAL REVIEW LETTERS
(2020)
Article
Biochemistry & Molecular Biology
Heike Rosner, Martina Caldarini, Gregory Potel, Daniel Malmodin, Maria A. Vanoni, Alessandro Aliverti, Ricardo A. Broglia, Birthe B. Kragelund, Guido Tiana
Summary: The denatured state of HIV-1 protease displays transient native and non-native structures under native conditions, with chemical shifts and relaxation parameters converging to similar values despite the use of different denaturants. Advanced molecular dynamics simulations have characterized the conformational properties of this biologically relevant denatured state, validating the results through comparison to experimental data.
PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS
(2022)
Article
Physics, Multidisciplinary
M. Weinert, M. Spieker, G. Potel, N. Tsoneva, M. Muescher, J. Wilhelmy, A. Zilges
Summary: The microscopic structure of the low-energy electric dipole response in Sn-120, known as pygmy dipole resonance (PDR), was studied in an experiment by comparing experimental data with a novel theoretical approach. The results demonstrate the importance of understanding the one-particle-one-hole structures of the 1(-) states in the PDR region for reliably predicting PDR properties and its contribution to nucleosynthesis processes.
PHYSICAL REVIEW LETTERS
(2021)
Article
Astronomy & Astrophysics
M. Holl, R. Kanungo, Z. H. Sun, G. Hagen, J. A. Lay, A. M. Moro, P. Navratil, T. Papenbrock, M. Alcorta, D. Connolly, B. Davids, A. Diaz Varela, M. Gennari, G. Hackman, J. Henderson, S. Ishimoto, A. Kilic, R. Krucken, A. Lennarz, J. Liang, J. Measures, W. Mittig, O. Paetkau, A. Psaltis, S. Quaglioni, J. S. Randhawa, J. Smallcombe, I. J. Thompson, M. Vorabbi, M. Williams
Summary: In the experiment on proton inelastic scattering of He-8 at 8.25A MeV at TRIUMF, a resonance at 3.54 MeV with a large deformation parameter beta(2) = 0.40(3) was discovered, consistent with predictions of neutron deformation. This reveals a new paradigm of deformed double-closed shell at the neutron drip-line.
Article
Physics, Nuclear
C. Hebborn, F. M. Nunes, G. Potel, W. H. Dickhoff, J. W. Holt, M. C. Atkinson, R. B. Baker, C. Barbieri, G. Blanchon, M. Burrows, R. Capote, P. Danielewicz, M. Dupuis, Ch Elster, J. E. Escher, L. Hlophe, A. Idini, H. Jayatissa, B. P. Kay, K. Kravvaris, J. J. Manfredi, A. Mercenne, B. Morillon, G. Perdikakis, C. D. Pruitt, G. H. Sargsyan, I. J. Thompson, M. Vorabbi, T. R. Whitehead
Summary: We review recent progress in nuclear optical potentials and emphasize the need for further developments, especially in regions away from stability. An improved description of nuclear reactions involving short-lived isotopes has significant benefits for fundamental science discoveries and applications. We outline the methods used to build optical potentials and discuss the strengths and weaknesses of each approach. We also provide open challenges and recommendations to advance nuclear reaction studies in the rare-isotope beam era.
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
(2023)
Article
Physics, Multidisciplinary
Daniel Bazin, Kevin Becker, Francesca Bonaiti, Charlotte Elster, Kevin Fossez, Tobias Frederico, Alex Gnech, Chloe Hebborn, Michael Higgins, Linda Hlophe, Benjamin Kay, Sebastian Konig, Konstantinos Kravvaris, Jesus Lubian, Augusto Macchiavelli, Filomena Nunes, Lucas Platter, Gregory Potel, Xilin Zhang
Summary: It is intriguing that distinct few-body structures can emerge from the complex dynamics of many nucleons in nuclear physics. These halo or cluster states are often observed near the boundaries of nuclear stability and play a crucial role in the experimental program at the Facility for Rare Isotope Beams (FRIB). A combined effort of theory and experiment is essential to analyze experiments involving few-body states and refine theories of nuclear force using new data obtained from these experiments. This paper compiles perspectives from a topical program held at FRIB in August 2022, which brought together theorists and experimentalists working on few-body cluster structures in exotic nuclei and their role in FRIB experiments.
Article
Physics, Nuclear
N. Schunck, M. Verriere, G. Potel Aguilar, R. C. Malone, J. A. Silano, A. P. D. Ramirez, A. P. Tonchev
Summary: Fission data are crucial for nucleosynthesis simulations and nuclear forensics. The characteristics of fission for odd-mass nuclei, as well as even-even nuclei, are important in various applications. Fission theories that aim at describing fission dynamics are usually based on nuclear mean-field theories. In this article, we use the blocking prescription of the Hartree-Fock-Bogoliubov theory with Skyrme energy functionals to investigate odd-mass uranium isotopes. Our results show that the fission fragment distributions depend significantly on the spin of the odd neutron. We propose a methodology based on the calculation of the spin distribution to predict the charge and mass distributions in odd-mass nuclei.
Article
Physics, Nuclear
C. Hebborn, G. Potel
Summary: Knockout nuclear reactions are widely used as an experimental tool to study unstable isotopes and the single-particle nature of the nuclear spectrum. The current theoretical approach, using shell-model spectroscopic factors and an eikonal model, has been successful for valence nucleon removal in stable nuclei. However, it may need to be revisited for exotic nuclei with extreme neutron-to-proton ratios.
Article
Physics, Nuclear
R. A. Broglia, F. Barranco, G. Potel, E. Vigezzi
Summary: Effectively charged neutrons involved in one- and two-nucleon tunneling processes in heavy-ion collisions between superfluid nuclei are expected to emit photons. The predicted line shapes reflect the different physics characteristics.
Article
Physics, Nuclear
T. R. Whitehead, T. Poxon-Pearson, F. M. Nunes, G. Potel
Summary: The uncertainties due to optical potentials used in charge-exchange reactions are determined in this study. Results show that modern optical potentials can reproduce charge-exchange cross sections reasonably well, but when uncertainties are taken into account, the predictions have large uncertainties.
Article
Physics, Nuclear
K. L. Malatji, K. S. Beckmann, M. Wiedeking, S. Siem, S. Goriely, A. C. Larsen, K. O. Ay, F. L. Bello Garrote, L. Crespo Campo, A. Gorgen, M. Guttormsen, V. W. Ingeberg, P. Jones, B. Kheswa, P. Von Neumann-Cosel, M. Ozgur, G. Potel, L. Pellegri, T. Renstrom, G. M. Tveten, F. Zeiser
Summary: The nuclear level densities and gamma-ray strength functions of Sm-153, Sm-155 were extracted using the Oslo method, showing agreement with microscopic calculations and QRPA calculations. An enhancement in the gamma SFs around 3 MeV in excitation energy was attributed to the M1 scissors resonance in both nuclei.
Proceedings Paper
Astronomy & Astrophysics
F. M. Nunes, T. Poxon-Pearson, M. Catacora-Rios, L. Hlophe, J. Pereira, G. B. King, A. E. Lovell, G. Potel
NUCLEAR PHYSICS IN ASTROPHYSICS IX (NPA-IX)
(2020)
Article
Physics, Nuclear
F. Barranco, G. Potel, E. Vigezzi, R. A. Broglia
Article
Physics, Nuclear
G. Potel, F. Barranco, E. Vigezzi, R. A. Broglia
Summary: This passage discusses the special effects of Josephson-like junctions in heavy-ion collisions, revealing the microscopic characteristics of Cooper pair tunneling. By studying nuclear reactions at different energies, the correlation length of nuclear Cooper pairs can be estimated, and the distribution of gamma rays with a frequency related to the Cooper pair tunneling is predicted.