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 FC: Mini-Symposium: Overview of Two and Three-nucleon Correlations in Nuclei III	Hide Abstracts
Chair: Or Hen, Massachusetts Institute of Technology Room: Hilton Kohala 2

Friday, October 26, 2018 9:00AM - 9:30AM	FC.00001: New results from studies of two- and three-nucleon correlations in nuclei Invited Speaker: Erez Cohen Two- and three-nucleon short-range correlations (SRC) are clusters of nucleons, in which each of the nucleons carry a momentum greater than the Fermi momentum of the nucleus, and their total (i.e. center-of-mass) momentum is smaller than the Fermi momentum. The combination of new electron scattering data from JLab, together with the analysis of data from measurements of hadronic reactions revolutionized our understanding of two-nucleon SRCs and their impact on the nuclear wave function, and are shedding new light on studies of three-nucleon correlations. I will review selected recent experimental results and their relation to effective and ab-initio theory calculations.
Friday, October 26, 2018 9:30AM - 9:45AM	FC.00002: Correlations in nuclear matter and nuclei Francesca Sammarruca, Laura Elisa Marcucci, Michele Viviani For a realistic description of nuclear matter, one should start from the bare interactions between the constituent hadrons and then include modifications of the nucleon propagation due to the medium. This introduces important correlations in the nuclear wave function, as opposed to operating at the mean-field level. Short-range correlations (SRC), in particular, originate from the repulsive core of the nuclear force and depend on the nature and strength of the nuclear forces being employed [1]. We will discuss recent predictions of nuclear matter properties based on modern, high-precision chiral interactions [2]. Based on interactions of the same nature, we will also address investigations, presently in progress, of SRC and momentum distributions in few-body systems, with reference to analyses of inclusive electron scattering experiments [3]. [1] F. Sammarruca, Phys. Rev. C 90, 064312 (2014), and references therein. [2] D.R. Entem, R. Machleidt, and Y. Nosyk, Phys. Rev. C 96, 024004 (2017). [3] K.S. Egiyan et al., Phys. Rev. Lett. 96, 082501 (2006).
Friday, October 26, 2018 9:45AM - 10:00AM	FC.00003: Towards Inclusive EMC and SRC ratios for ¹⁰B, ¹¹B Nadia Fomin Inclusive cross section ratio measurements at Jefferson Lab at 6 GeV yielded precision EMC and SRC results, as well as exhibiting a suggestive correlation between the two. ⁹Be ratios showed that simple A- or density-dependent pictures could not describe the trends in the EMC or SRC ratios. EMC effect and SRC ratios could share a common origin or the short-range nature of the SRCs could give rise to the EMC effect. Inclusive data on new light nuclei (¹¹B and ¹⁰B) in DIS as well as SRC kinematics were taken in Hall C at Jefferson Lab in the spring of 2018. The analysis methods will be presented along with preliminary results.
Friday, October 26, 2018 10:00AM - 10:15AM	FC.00004: Abstract Withdrawn
Friday, October 26, 2018 10:15AM - 10:30AM	FC.00005: Inclusive Short-range Correlation Measurement with 3H and 3He at Jefferson Lab Shujie Li In a classical view the nucleon-nucleon potential has a strong repulsive core. When a two-nucleon (sub)system falls into this range, they will interact strongly and move away from each other with large momentum. In electron Quasi-elastic(QE) scattering, these so-called short-range correlation(SRC) pairs in nuclei produce events with nucleon initial momentum above the Fermi level. Previous exclusive QE measurements reported a neutron-proton pair (isosinglet) dominance in high-momentum nucleons. Experiment E12-11-112 at JLab Hall A is designed to check this isospin dependence of SRC by taking the ratio of 3H to 3He cross section at 1.5<xbj<2 where the high-momentum nucleons dominate. The first two run periods (December 2017, and May 2018) collected 3H, 3He, and 2H QE data with 2.2 GeV electron beam at Q2=0.4 - 1 GeV2. The third run period (October 2018) is planned to collect 1<xbj<3 data at Q2=1.4 GeV2. In this talk I will show the experiment design and the status of the data analysis.
Friday, October 26, 2018 10:30AM - 10:45AM	FC.00006: Measurement of ³He analyzing power for p &[minus] ³He scattering at 70 MeV Atomu Watanabe, Kimiko Sekiguchi, Tomomi Akieda, Daijiro Eto, Masatoshi Itoh, Takashi Ino, Yoshinori Inoue, Kenta Kawahara, Hiroshi Kon, Kenjiro Miki, Tomoyuki Mukai, Shinnosuke Nakai, Daisuke Sakai, Shun Shibuya, Yuta Shiokawa, Takahiro Taguchi, Yasunori Wada, Takashi Wakui, Morihiro Watanabe Three-nucleon forces (3NFs) are essentially important in clarifying various nuclear phenomena. With the aim of exploring the properties of the 3NFs in four-nucleon scattering systems we are planning the measurement of p−³He scattering with the polarized ³He target at intermediate energies (E/A ≥ 65 MeV). We developed the polarized ³He target for the measurement of ³He analyzing power. Polarized ³He was produced by the spin-exchange optical pumping method. To measure ³He polarizations and control ³He spin directions, we used the adiabatic fast passage–NMR method. We obtained the absolute values of ³He polarizations by the electron spin resonance measurement. ³He polarizations were about 50 %. Using the polarized ³He target, we performed the measurement of ³He analyzing power with 70 MeV proton beams at the Cyclotron and Radioisotope Center, Tohoku University. Measured angles were from 35◦ to 125◦ in the laboratory system (47◦ − 141◦ in the center of mass system). We extracted ³He analyzing power by measuring the asymmetry of elastically scattered protons from the polarized ³He target. In the conference we will report results of this experiment.
Friday, October 26, 2018 10:45AM - 11:00AM	FC.00007: Complete set of deuteron Analyzing Powers for $dp$ Elastic Scattering at 70--300 MeV/nucleon and Three-Nucleon Forces Kimiko Sekiguchi, Yasunori Wada, Atomu Watanabe, Daijiro Eto, Tomomi Akieda, Hiroshi Kon, Kenjiro Miki, Naruhiko Sakamoto, Hideyuki Sakai, Masaki Sasano, Yohei Shimizu, Hiroshi Suzuki, Tomohiro Uesaka, Yoshiyuki Yanagisawa, Masanori Dozono, Shoichiro Kawase, Yuki Kubota, Kentaro Yako, Yukie Maeda, Satoshi Sakaguchi, Tomotsugu Wakasa, Evgeny Milman, Sergey Chebotaryov Few-nucleon scattering at intermediate energies ($E/A \gtrsim 100 \rm MeV$) is one attractive approach to investigate the dynamical aspects of three-nucleon forces (3NFs), such as momentum and/or spin dependences. With the aim of clarifying roles of the 3NFs in nuclei the experimental programs with polarized deuterons beams at intermediate energies are in progress at RIKEN RI Beam Factory (RIBF). We have measured all deuteron analyzing powers ($iT_{11}$, $T_{20}$, $T_{21}$, and $T_{22}$) for deuteron--proton ($dp$) elastic scattering at 70--300 MeV/nucleon, typically in step of 50 MeV/nucleon.The obtained high precision data are compared with the results of three-nucleon Faddeev calculations based on the nucleon-nucleon (NN) potentials; $i.e.$ CD Bonn, Argonne V$_{18}$, Nijmegen I, and II, alone or combined with the Tucson-Melbourne'99 and the Urbana IX 3NFs. Large discrepancies between the pure NN theory and the data, which are not resolved even by adding the current 3NFs, are found at the c.m. backward angles for almost all the deuteron analyzing powers with increasing an incident energy. In the meeting the comparison between the data and the calculations based on the $\chi$ EFT potentials will also be presented.
Friday, October 26, 2018 11:00AM - 11:15AM	FC.00008: Chiral nuclear forces: Current status and outstanding challenges Ruprecht Machleidt During the past two decades, chiral effective field theory has evolved into the authoritative approach to derive nuclear two- and many-body forces in a systematic and model-independent way. Nowadays, most ab initio calculations of nuclear structure and reactions are conducted with chiral forces. I will summarize the state of the art in the construction of high-quality chiral nuclear forces. Moreover, I will discuss the application of these forces in ab initio calculations of few-nucleon reactions and the structure of light and intermediate-mass nuclei. Problems and open issues will be outlined and an attempt will be made to relate them to specific deficiencies of the two- and many-nucleon forces currently in use.
Friday, October 26, 2018 11:15AM - 11:30AM	FC.00009: New variational method of tensor-optimized antisymmetrized molecular dynamics with bare nuclear force Takayuki Myo, Mengjiao Lyu, Masahiro Isaka, Hiroshi Toki, Hisashi Horiuchi, Kiyomi Ikeda, Tadahiro Suhara, Taiichi Yamada We developed a new variational method of "tensor-optimized antisymmetrized molecular dynamics" (TOAMD) for nuclear many-body systems. In TOAMD, the correlation functions for the tensor force and the short-range repulsion are successively multiplied to the AMD wave function. These correlation functions are optimized independently and induce many-body correlations in nuclei. It is shown that TOAMD reproduces the results of the few-body calculations for light nuclei with bare Argonne potential. It is also confirmed that variational accuracy of TOAMD is better than that of the Jastrow correlation method. We further extend TOAMD by taking superposition of the AMD basis states as TOAMD+GCM. We include high-momentum components in the Gaussian wave packets of nucleons in AMD. We show that the TOAMD+GCM nicely reproduces the ab-initio results of light nuclei.

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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 FC: Mini-Symposium: Overview of Two and Three-nucleon Correlations in Nuclei III

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