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 C10: Nuclear Structure I |
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Chair: Riccardo Orlandi, JAEA, ASRC Room: Hilton Waikoloa Village Kohala 3 |
Tuesday, November 28, 2023 7:00PM - 7:15PM |
C10.00001: First observation of multi phonon gamma vibrational bands in odd-odd 104Nb enhong wang, Joseph H Hamilton, Navin ALAHARI, Jérémie Dudouet, Mojahed Abushawish, Sarmishtha Bhattacharya, R Banik High spin states of neutron rich nucleus 104Nb have been reinvestigated by gamma-gamma-gamma and gamma-gamma-gamma-gamma coincidence events following 252Cf spontaneous fission with Gammasphere and 238U+9Be induce fission with VAMOS++, EXOGAM and AGATA at GANIL. The one and two phonon gamma vibrational bands in 104Nb have been identified. Projected shell model calculations have been performed and found to be in good agreement with the experimental data. |
Tuesday, November 28, 2023 7:15PM - 7:30PM |
C10.00002: Search for the missing isomer in the rare-earth nucleus 158Pm Sanjanee W Waniganeththi, Andrew M Rogers, Filip G Kondev, Patrick A Copp, Daniel E Hoff, Sean P Byrne, Michael P Carpenter, Partha Chowdhury, Jason A Clark, Emily J Gass, Daryl J Hartley, Torben Lauritsen, Sergio Lopez-Caceres, Scott T Marley, Alan J Mitchell, Graeme Morgan, Chris Morse, Claus Muller-Gatermann, Walter Reviol, Guy Savard, Dariusz Seweryniak, Kartikeya Sharma, Marco Siciliano, Yiyi Zhu Probing the intrinsic and collective structure of nuclei in the light rare-earth region provides important insight into the evolution of nuclear deformation and the properties of neutron-rich nuclei far from stability. This understanding is critical for exploring the formation of the rare-earth peak in the r-process abundance pattern, where new data can influence constraints on the possible astrophysical sites and conditions. The odd-odd nucleus 158Pm is a particularly interesting case as a predicted isomeric state has yet to be clearly established. Investigating such isomers is critical to determining their structure as well as to remove ambiguities that can arise in direct mass measurements. To investigate this region a βγ-coincidence experiment was performed at Argonne National Laboratory (ANL) using the HPGe clover detectors of X-Array (XA) combined with the SATURN moving tape system. Radioactive ions produced by the Californium Rare Isotope Breeder Upgrade (CARIBU) facility were isobarically separated and delivered to the XA+SATURN decay station. Various tape cycles were optimized for the decay of a given species, with a focus on 158Pm and 160Sm. In this talk, evidence addressing the missing 158Pm isomer will be presented as well as new β-decay data on the relevant A=158 and 160 isobars. |
Tuesday, November 28, 2023 7:30PM - 7:45PM |
C10.00003: Decay Spectroscopy of 160Eu: Quasiparticle Configurations and Structure in 160Gd Daniel Yates, Reiner Kruecken, Iris Dillmann, Paul E Garrett, Bruno Olaizola, Victoria Vedia, Fuad A Ali, Corina Andreoiu, William Ashfield, Gordon C Ball, Zachary F Beadle, Nikita Bernier, Soumendu S Bhattacharjee, Harris Bidaman, Vinzenz Bildstein, Daryl Bishop, Michael Bowry, Christina Burbadge, Roger Caballero-Folch, Donlad Z Chaney, David S Cross, Alejandra D Varela, Ryan A Dunlop, Michelle Dunlop, Lee Evitts, Fatima H. Garcia, Adam B Garnsworthy, Shaun Georges, Stephen Gillespie, Greg Hackman, Jack Henderson, Badamsambuu Jigmeddorj, Jens Lassen, Ruohong Li, Benjamin K Luna, Andrew D MacLean, Connor R Natzke, Costel Petrache, Allison J Radich, Mustafa M Rajabali, Patrick Regan, Yukiya Saito, James Smallcombe, Jenna Smith, Mark Spieker, Carl E Svensson, Andrea Teigelhöfer, Kenneth A Whitmore, Tammy Zidar Detailed spectroscopy of neutron-rich, heavy, deformed nuclei is of broad interest for nuclear astrophysics and nuclear structure. The structure of nuclei along the r-process path and in the region involved in the freeze-out impact the resulting r-process final abundance distribution. Knowledge of the structure of nuclei midshell in both proton and neutron number around mass A≈165 helps to understand the evolution of subshell gaps and deformation parameters in these nuclei and the r-process flow around the rare-Earth peak. |
Tuesday, November 28, 2023 7:45PM - 8:00PM |
C10.00004: Constraints on the decay of 180mTa Steve R Elliott 180mTa is a rare nuclear isomer whose decay has never been observed. Its remarkably long lifetime surpasses the half-lives of all other known beta and electron capture decays due to the large K-spin differences and small energy differences between the isomeric and lower energy states. Detecting its decay presents a significant experimental challenge but could shed light on neutrino-induced nucleosynthesis mechanisms, the nature of dark matter and K-spin violation. For this study, we repurposed the Majorana Demonstrator, an experimental search for the neutrinoless double beta decay of 76Ge using an array of high-purity germanium detectors, to search for the decay of 180mTa. Over 17 kilograms was installed within the ultra-low background detector array. We present results from the first year of Ta data and provide an updated limit for the 180mTa half-life. With new limits >1.5 x 1019 years, we improved existing limits by one to two orders of magnitude. We gratefully acknowledge support from the Department of Energy through the Los Alamos National Laboratory's Directed Research and Development Program, the DOE Office of Nuclear Physics, the Particle Astrophysics and Nuclear Physics Programs of the National Science Foundation, and the Sanford Underground Research Facility. |
Tuesday, November 28, 2023 8:00PM - 8:15PM |
C10.00005: Study of deformed structure in 254Es by Coulomb excitation Eiji Ideguchi, Tung T Pham, Riccardo Orlandi, Nori Aoi, Asahi Kohda, Katsuhisa Nishio, Hiroyuki Makii, Masato Asai, Fumi Suzaki, Kentaro Hirose, Tetsuya K Sato, Kazuaki Tsukada, Yuta Ito, Toshiyuki Shizuma, Yongde Fang, Kumar Raju Mukhi, Jian-Guo Wang, Guo Song, Minliang Liu, Xiaohong Zhou, Nobuaki Imai, Noritaka Kitamura, Shin'ichiro Michimasa, Yosuke Toh, Krzysztof Piotr P Rykaczewski, R. A Boll, Julie Ezold, Shelley Van Cleve, Kevin K Felker, James B Roberto, Shintaro Go, Masaomi Tanaka, Andrei N Andreyev, Anatoli Afanasjev Exploring the new elements toward the high end of the nuclear chart is one of the most interesting topics in nuclear physics. The key ingredient to stabilize nucleus in this region is a nuclear shell structure and Z=114, 120, N=184 are predicted to be new magic numbers. However, the study of such nuclei and their shell structure is limited by the very low cross sections. To investigate the shell structure, we are focusing on the nuclei in the A~250 region including 254Es. By studying the excited states, spin and parity, and deformation, we will be able to access the single-particle orbitals relevant to new shell structure at Z=114, 120, N=184 in the super-heavy mass region. |
Tuesday, November 28, 2023 8:15PM - 8:30PM |
C10.00006: A new method for derivation of the proton distribution radii through charge-changing cross sections for light-mass isotope chains Gen Takayama, Mitsunori Fukuda, Masaomi Tanaka, Miki Fukutome, Yoko Kimura, Ryo Taguchi, Kaoru Watanabe, Daiki Nishimura, Hiroyuki Takahashi, Sora Sugawara, Chihaya Fukushima, Akira Ozawa, Tetsuaki Moriguchi, Asahi Yano, Takashi Otsubo, Maya Takechi, Mizuki Ogose, Norihide Noguchi, Kazuya Takatsu, Yukiya Kobayashi, Yuki Tazawa, Natsuki Shindo, Takeshi Suzuki, Takayuki Yamaguchi, Hibiki Seki, Masanori Kanda, Takuji Izumikawa, Shinji Sato, Shigekazu Fukuda, Atsushi Kitagawa, Kensaku Matsuta, Mototsugu Mihara, Yurika Ohtani
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Tuesday, November 28, 2023 8:30PM - 8:45PM |
C10.00007: Neutron distribution of 208Pb by low-energy electron scattering Rika Danjo The charge density distributions of nuclei are best determined by elastic electron scattering, and the stable nuclei that have been studied so far have played an essential role in revealing their internal structure. |
Tuesday, November 28, 2023 8:45PM - 9:00PM |
C10.00008: Design and simulation of electron injection system for scattering off rare isotopes at FRIB. Ambar C Rodriguez Alicea, Paul Gueye, Alain Lapierre, Mikhail Fedurin, Kei Minamisono The Facility for Rare Isotope Beams (FRIB) started operation on May 10, 2022, becoming the most powerful facility to study rare isotopes for nuclear astrophysics research. Several facilities are under developments to couple electron linacs to storage rings in Japan (SCRIT at RIKEN) and in Europe (ELISE at FAIR, GANIL, and DERICA in Dubna) with the possibility to extend past and current scattering experiments from stable nuclei to exotic nuclei. Of particular interest is the experimental measurement of the nuclear charge radius for these systems since such information is lacking for nuclei beyond Bi and is a critical ingredient for theoretical models. We investigate the structure for an electron beam that could be coupled to FRIB beamline to perform scattering experiments. The results from this study will be presented and discussed. |
Tuesday, November 28, 2023 9:00PM - 9:15PM |
C10.00009: Calculation of radial moments of charge distribution Kota Yoshinaga, Nobuo Hinohara, Takashi Nakatsukasa, Noritaka Shimizu The charge radius is one of the most fundamental quantities concerning nuclear structure. Recent advancements in high-precision spectroscopic measurements utilizing isotope shifts have provided accurate experimental data on the second-order moments of charge distribution, including isotopes in regions of proton and neutron excess. Although there is no precise theoretical calculation that can match these experimental values, its calculation has the potential to contribute to the search for new physics. In this study, we try to develop theoretical models with high accuracy. Our calculations take into account not only the contribution from proton distribution but also that from neutron distribution in determining the charge distribution of a nucleus. By comparing the calculated results with the experimental values, we investigate the systematic change among various isotopes. Calculations employing the Fayans type density functionals in the mean-field model successfully reproduce the changes in the second-order moments of charge distributions observed in Ca isotopes and other isotopes. We know, however, that there are unstable regions where experimental values cannot be reproduced. Therefore, we investigated the factor of non-reproducibility by examining various nuclei. We will discuss the current state of charge radius calculations and the necessity to construct theoretical models beyond the mean-field approximation. |
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