Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session M05: Nuclear Structure VI |
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Chair: Futoshi Minato, Kyushu University Room: Hilton Waikoloa Village Queens 4 |
Friday, December 1, 2023 2:00PM - 2:15PM |
M05.00001: Exclusive deuteron electro-disintegration with a polarized target Nathaly Santiesteban The tensor polarized target at Jefferson Lab can be used to measure the spin structure of the deuteron in a kinematic regime where the D-state starts to dominate the ground state. This talk presents a set of kinematics to measure the D(e, e'p)n tensor asymmetry for missing momenta up to 450 MeV/c and momentum transfer larger than 2 GeV2, suitable to perform an experiment at Jefferson Lab. The measurements could help in the understanding of the deuteron structure of nucleons with high missing momenta. |
Friday, December 1, 2023 2:15PM - 2:30PM |
M05.00002: The ABC model for Ω-np system Roman Y Kezerashvili, Igor Filikhin, Branislav Vlahovic In the framework of the Faddeev equations in configuration space, we investigate the Ω-NN system using different versions of the attractive Ω-N 5S2 potentials derived by the HAL QCD Collaboration. We perform calculations of the binding energy and ground state characteristics for the particle configuration Ω-np (Jπ = 5/2+) within two models: the ABC model, in which all three particles are distinguishable due to the Coulomb interaction in the pair BC, and the AAC model when two particles (nucleons) are identical when the Coulomb force is omitted. There are some discrepancies in AAC calculations for the binding energy of the Ω-NN system within different theoretical approaches. We evaluated the effect of the Coulomb force within the ABC model and compared with the AAC Faddeev calculations in momentum and coordinate spaces and variation method [1,2,3]. We found that the Coulomb energy shifts in three-body binding energy is about 0.9 MeV. At the same time, the effect of the Coulomb potential on the particle distribution in the Ω-np is insignificant and does not violate symmetry of the particle distribution evaluated by root-mean-square distances. |
Friday, December 1, 2023 2:30PM - 2:45PM |
M05.00003: The 2023 Physicists Inspiring the Next Generation: Exploring the Nuclear Matter Paul Gueye, Thomas Baumann, Casey Hulbert The 2023 cohort of the “Physicists Inspiring the Next Generation (PING): Exploring the Nuclear Matter” included twenty-four pre-college students that worked with ten undergraduate students at the Facility for Rare Isotope Beams of Michigan State University, East Lansing, MI. PING includes a two-week summer program and year-round research opportunity for high school and middle school students, as well as a year-round research component for undergraduate students on basic and applied nuclear physics topics. Over the Summer 2023, the students assembled and perform experiments using the Rutherford scattering experiment kit from Leybold along with comparing their measurements with a Geant4 simulation. This work is serving as a baseline for a beam monitoring and charge radii measurement of rare isotopes for the MoNA Collaboration. Some of the PING2022 students continued collaborating with the PING2023 undergraduate students on the development of a modular PYXIS neutron detector that is expected to complement the MoNA-LISA neutron array and consists of 25 cm long scintillators with cross sectional areas of 2.5x2.5 cm2 and 5x5 cm2. The pre-college participants represented schools from California, Georgia, Illinois, Maryland, Michigan, New Jersey, New York, North Carolina, Pennsylvania, South Carolina, Virginia, Washington, and Wisconsin. The status of this research will be presented and discussed. |
Friday, December 1, 2023 2:45PM - 3:00PM |
M05.00004: From ENSDF to NuDat: Search, Filter and Visualize Nuclear Data Donnie Mason, Elizabeth McCutchan, Alejandro A Sonzogni The National Nuclear Data Center (NNDC) at Brookhaven National Laboratory (BNL) develops NuDat, a web application where users can explore several databases containing nuclear structure, nuclear decay, and neutron-induced nuclear reaction information. NuDat is the primary web application used to query and visualize nuclear data from the Evaluated Nuclear Structure Data File (ENSDF). ENSDF contains meticulously evaluated recommended values derived from all published experimental nuclear structure and decay data. Over 6 million downloads are made through NuDat each year for research, education, and a wide range of applications. The current technology used within NuDat was first developed over 15 years ago and since then significant improvements to web technologies have been made. Many new features have been implemented for NuDat 3.0 such as additional datasets, customizable color palettes, and a 3D version using Three.js. The 3D chart of nuclides offers an intuitive visualization that provides users with an alternative perspective on nuclear physics phenomena. By modernizing NuDat and continuously integrating new features, the NNDC aims to provide an enhanced user experience that promotes discovery and exploration of nuclear data properties. |
Friday, December 1, 2023 3:00PM - 3:15PM |
M05.00005: ENSDF for the 21st Century Chris Morse, Elizabeth McCutchan, Donnie Mason, Andrea Mattera, Shuya Ota, Benjamin Shu, Jin Wu The Evaluated Nuclear Structure Data File (ENSDF) has served the nuclear science and applications communities for decades as the authoritative source for evaluated nuclear structure data. However, as both science and technology have advanced, the rigid and increasingly archaic format of ENSDF has made it difficult to parse for both humans and computers. For the last three years, ENSDF has been the focus of a major effort to convert it into a modern database. With the conclusion of that project, ENSDF has been transformed from a collection of FORTRAN punch card-like text files into a modern JavaScript Object Notation (JSON) format. This talk will present the new ENSDF database and discuss opportunities which the format is expected to enable, including potential future improvements to the database. |
Friday, December 1, 2023 3:15PM - 3:30PM |
M05.00006: BErkeley Alpha and proton Radiation (BEApR) database: an On-line Heavy Charged-Particle Decay Database Jon C Batchelder, Aaron M Hurst, Sanjana Goyal, Yun-Hsuan Lee The Berkeley data group have launched an online database BErkeley Alpha and proton Radiation (BEApR) detailing all known information on beta-delayed and direct heavy particle emitters (p, $alpha$, fission). This includes branching ratios, T$_{1/2}$, and all relevant Q and particle separation values. These are listed for all nuclei where these decays are energetically possible. In addition, for nuclei with known discrete proton and alpha transitions, the particle energies, intensities, initial and final states are compiled. A figure showing the major decays and a list of experimental references is also given for each dataset. Nuclei are organized by their isospin projection (Tz) and alpha-chain in this database, and split into even and odd Z. Information for this database is primarily obtained through a combination of NSR, google scholar, and IAEA. |
Friday, December 1, 2023 3:30PM - 3:45PM |
M05.00007: Decay-correlated time-of-flight mass spectroscopy using multi-reflection time-of-flight mass spectrographs Peter Schury, Toshitaka Niwase, Michiharu Wada, Marco Rosenbusch, Pierre Brionnet, Yoshikazu Hirayama, Daiya Kaji, Sota Kimura, Kouji Morimoto, Momo Mukai, Yutaka X Watanabe, Hiromitsu Haba, Hermann Wollnik, Hironobu Ishiyama, Wenduo Xian, Aiko Takamine In recent years, multi-reflection time-of-flight mass spectrographs (MRTOF-MS) have proven to be superbly valuable tools for online determinations of atomic masses. Recently, they have achieved mass resolving powers m/Δm≈106 with flight times t<20 ms for A/q~100 ions. They are also able to simultaneously analyse multiple isobar chains, making them a highly efficacious tool for use with in-flight fission and fragmentation, as well as multi-nucleon transfer reactions. |
Friday, December 1, 2023 3:45PM - 4:00PM |
M05.00008: Performance and geant4 simulation of the proton polarimeter 2nd-FPP for (p,2p) measurements Yusuke Tanaka, Wataru Yamashita, Tomotsugu Wakasa, Hiroki Nishibata, Takahumi Kajihara, Kazuki Aradono, Yosuke Yamamoto, Yohei Nagao, Kouhei Tanimoto, Kanki Kishimoto, Hidetomo P Yoshida, Nobuyuki Kobayashi, Shinsuke Ota The 2nd-FPP is a focal plane proton polarimeter to measure the recoil proton polarization in the (p,2p) reaction. Recently, we newly introduced four MWDCs to improve the position and angle resolution. The performance was investigated by using protons of polarization $P$=0.99 by p-C elastic scattering at 65 MeV. The position resolution of about 0.34 mm has been achieved, which is significantly better than that obtained from plastic scintillator information. The resulting effective analyzing powers at angles larger than 60 degrees are consistent with the design values based on p-C analyzing powers. However, those at small angles are significantly small. Thus, we have been developing a geant4 simulation to evaluate the effect of p-p scattering contribution in the plastic scintillator material. In this contribution, we will give the experimental results and the progress of the geant4 simulation with the polarization effects to access the p-C and p-p contributions on the effective analyzing powers. |
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