Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session DC: Mini-Symposium: Overview of Two and Three-nucleon Correlations in Nuclei I |
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Chair: Kimiko Sekiguchi, Tohoku University Room: Hilton Kohala 2 |
Thursday, October 25, 2018 9:00AM - 9:30AM |
DC.00001: Overview of two and three-nucleon correlations in nuclei Invited Speaker: J. Carlson Placeholder. |
Thursday, October 25, 2018 9:30AM - 9:45AM |
DC.00002: Understanding effect of tensor interactions in light nuclei via high-momentum neutron-transfer reaction Hooi Jin Ong, Satoru Terashima
The tensor interactions, which originate mainly from the pion exchange, are essential interactions that provide the most significant two-body attraction in nuclear interactions. Ab-initio calculations have suggested the importance of the tensor interactions for binding nuclei up to mass number A=12. However, while it is generally accepted that the tensor interactions play a dominant role in nuclei, experimental evidence has been scarce and was limited to the lightest nuclei up to 4He. In our earlier work, we have reported possible observation of the effect of tensor interactions in 16O via measurement of high-momentum one-neutron transfer (p,d) reaction at finite angles up to 25 degrees [1]. To confirm the earlier observation, and to understand more quantitatively the effect of tensor interactions in light nuclei, we have performed several inclusive and exclusive measurements using high-momentum one-neutron transfer reactions at Research Center for Nuclear Physics (RCNP), Osaka University and GSI Helmholtzzentrum für Schwerionenforschung (GSI). In this talk, we will introduce our approach, the experiments at RCNP and GSI, and present some of the recent experimental results.
Reference:
[1] H.J. Ong, I. Tanihata et al., Phys. Lett. B725, 277 (2013). |
Thursday, October 25, 2018 9:45AM - 10:00AM |
DC.00003: Study the Nucleon-Nucleon Force with Short Range Correlation Measurements Igor Korover Although the nucleon-nucleon interaction have been studied intensively in the past decades, the experimental data at short distances is limited. Short Range Correlation (SRC), introduce a powerful tool to investigate the short-distance force between nucleons. The use of SRC allows to experimentally investigate the tensor and repulsive parts of the nucleon-nucleon interaction. Exclusive studies of SRC demonstrated that the nucleon-nucleon interaction at short distance is insensitive to the size of nuclei. This allows to use light nuclei in order to compare experimental and theoretical predictions. Recently we performed exclusive SRC measurements on 4He at Hall A in Thomas Jefferson National Accelerator Facility. The dynamics of the nucleon-nucleon interaction as a function of the nucleon initial momenta was studied. In addition, data from the CLAS detector (a roughly 4π detector) was analyzed as part of the data-mining project. Some published and preliminarily data will be shown and discussed. |
Thursday, October 25, 2018 10:00AM - 10:15AM |
DC.00004: Recent results and implications of no-core MCSM calculations for nuclear structure Takashi Abe, Pieter Maris, Takayuki Miyagi, Petr Navratil, Takaharu Otsuka, Noritaka Shimizu, Yutaka Utsuno, James P Vary, Tooru Yoshida Owing to recent progress in computational environments and nuclear many-body calculational techniques, ab-initio approaches to nuclear structure and reactions have advanced greatly and are providing first principles results for low-energy nuclear theory. As one of these ab-initio many-body methods, the no-core Monte Carlo shell model (MCSM) has also been developed and applied. In this contribution, we will briefly summarize the current status of no-core MCSM calculations. No-core MCSM results in p-shell nuclei with realistic two-nucleon forces will be given as one of the demonstrations for the capability of our method. Regarding the inclusion of three-body-force effects, the no-core MCSM calculations with chiral EFT interactions will be presented. Our attempts for the study on alpha-cluster structure and molecular-orbital states in light nuclei will also be mentioned, focusing on the Be and C isotopes. |
Thursday, October 25, 2018 10:15AM - 10:30AM |
DC.00005: Recent progress on Lattice QCD calculation of Nuclear Forces Takumi Doi One of the most fundamental question in nuclear physics is how nuclear physics itself emerges from the underlying theory, quantum chromodynamics (QCD), and the determination of nuclear forces from QCD serves as the cornerstone to answer this question. While nuclear forces have been determined with good precision with phenomenological models and/or effective field theories, many parameters thereof are determined from experimental inputs and the connection to QCD is yet to revealed. |
Thursday, October 25, 2018 10:30AM - 10:45AM |
DC.00006: Three-nucleon force effects in nucleon-deuteron scattering with large cutoff parameters Souichi ISHIKAWA The necessity of three-nucleon potentials (3NPs) along with two-nucleon potentials (2NPs) in the nuclear Hamiltonian is well recognized. A 3NP based on two-pion exchange process among three nucleons (2piE) is often used in few-nucleon calculations, where its strong attractive effect is suppressed by a form factor with a low value of the cutoff mass parameter (about 700 MeV). In spite of various successful 2piE-3NP effects on 3N observables, there are still unsolved discrepancies between experimental data and calculations. A typical example is the differential cross sections at backward angles for intermediate energy elastic nucleon-deuteron (Nd) scattering. In this work, Nd cross sections are studied using Hamiltonian models consisting of a 2NP and 2piE-3NPs with a large cutoff mass parameter by adding phenomenological repulsive 3NPs as a counterpart. The use of the large cutoff mass parameter brings an increase of the ND cross sections at backward angles, which tends to reduce the discrepancies between previous calculations and data. This indicates an importance of the pion-exchange process at medium range region in the 2piE-3NP. Possible spin-dependence of phenomenological repulsive 3NPs will be discussed in comparing with ND polarization observables. |
Thursday, October 25, 2018 10:45AM - 11:00AM |
DC.00007: Analysis of pd scattering measurements at intermediate energies and three nucleon force effects Yukie Maeda, Toru Saito, Hiroyuki Miyasako, Tomohiro Uesaka, Shinsuke Ota, Shoichiro Kawase, Hiroshi TOKIEDA, Takahiro Kawabata, Kentaro Yako, Tomotsugu Wakasa, Satoshi Sakaguchi, Harutaka Sakaguchi, Tatsushi Shima, Tomokazu Suzuki, Atsushi Tamii The effects of three-nucleon force (3NF) has been actively studied by using the nucleon-deuteron (Nd) scattering states. The differential cross sections of the elastic Nd scattering at the energy below 150 MeV can be well reproduced by the Faddeev calculation based on modern nucleon-nucleon (NN) interactions and 3NF. On the other hand, the data at 250 MeV was underestimated by the Faddeev calculations with 3NF by 50%. And this large discrepancy between the data and the theory was also shown in the 2H(p, p)pn inclusive breakup reaction at Ep = 250 MeV. For the systematic study to understand the missing picture of 3NF, we performed the measurements of the pd inclusive breakup reactions at 170MeV and the exclusive breakup reactions at 250 MeV. The experiment was carried out at RCNP, Osaka University. The polarized proton beam of 170MeV or 250 MeV was injected to the deuterated polyethylene (CD2) target. In the inclusive breakup measurements, scattered neutrons were detected by using the neutron detector NPOL3. In the exclusive breakup measurements, scattered and recoil protons were detected by double arm spectrometer GR and LAS. The data was compared with the results of the Faddeev calculations with and without the 3NF. |
Thursday, October 25, 2018 11:00AM - 11:15AM |
DC.00008: Relativistic Faddeev Calculation for Nd Scattering with Kharkov Potential Hiroyuki Kamada, Aleksandr Shebeko, Adam Arslanaliev, Henryk Witala, Jacek Golak, Roman Skibinski Relativity in the three-nucleon (3N) system has been studying under the Bakamjian-Thomas frame, |
Thursday, October 25, 2018 11:15AM - 11:30AM |
DC.00009: Recent results for light nuclei with chiral two-body forces, three-body forces and consistent electroweak interactions James Vary, Pieter Maris Using the no-core shell model, we calculate ground and low-lying excited states of light nuclei in the mass range A=4-16 up through next-to-next-to-leading order in chiral effective field theory using semilocal coordinate-space regularized two- and three-nucleon forces from the Low Energy Nuclear Physics International Collaboration (LENPIC). The inclusion of the three-nucleon force is found to improve the agreement with experiment for most of the considered observables. These results and applications to Nd scattering may be found in a forthcoming paper (LENPIC collaboration, E. Epelbaum, et al., in preparation). We also investigate the corrections arising from consistent treatment of electroweak currents within two-body systems as a prelude to applications to light nuclei. |
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