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Ookami: An A64FX Computing Resource

https://doi.org/10.1088/1742-6596/2742/1/012019

Calder, A C; Siegmann, E; Feldman, C; Chheda, S; Smolarski, D C; Swesty, F D; Curtis, A; Dey, J; Carlson, D; Michalowicz, B; et al (April 2024, Journal of Physics: Conference Series)

We present a look at Ookami, a project providing community access to a testbed supercomputer with the ARM-based A64FX processors developed by a collaboration between RIKEN and Fujitsu and deployed in the Japanese supercomputer Fugaku. We provide an overview of the project and details of the hardware, and describe the user base and education/training program. We present highlights from previous performance studies of two astrophysical simulation codes and present a strong scaling study of a full 3D supernova simulation as an example of the machine’s capability.
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Precision Determination of the Neutral Weak Form Factor of ${}^{48}{Ca}$

https://doi.org/10.1103/PhysRevLett.129.042501

Adhikari, D.; Albataineh, H.; Androic, D.; Aniol, K. A.; Armstrong, D. S.; Averett, T.; Ayerbe Gayoso, C.; Barcus, S. K.; Bellini, V.; Beminiwattha, R. S.; et al (July 2022, Physical Review Letters)

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New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei

https://doi.org/10.1103/PhysRevLett.128.142501

Adhikari, D.; Albataineh, H.; Androic, D.; Aniol, K.; Armstrong, D. S.; Averett, T.; Ayerbe Gayoso, C.; Barcus, S.; Bellini, V.; Beminiwattha, R. S.; et al (April 2022, Physical Review Letters)

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Accurate Determination of the Neutron Skin Thickness of 208Pb through Parity-Violation in Electron Scattering

Adhikari, D.; Albataineh, H.; Androic, D.; Aniol, K.; Armstrong, D.S.; Averett, T.; Ayerbe Gayoso, C.; Barcus, S.; Bellini, V.; Beminiwattha, R.S.; et al (April 2021, Physical review letters)
null (Ed.)
We report a precision measurement of the parity-violating asymmetry APV in the elastic scattering of longitudinally polarized electrons from 208Pb. We measure APV=550±16(stat)±8(syst) parts per billion, leading to an extraction of the neutral weak form factor FW(Q2=0.00616 GeV2)=0.368±0.013. Combined with our previous measurement, the extracted neutron skin thickness is Rn−Rp=0.283±0.071 fm. The result also yields the first significant direct measurement of the interior weak density of 208Pb: ρ0W=−0.0796±0.0036(exp)±0.0013(theo) fm−3 leading to the interior baryon density ρ0b=0.1480±0.0036(exp)±0.0013(theo) fm−3. The measurement accurately constrains the density dependence of the symmetry energy of nuclear matter near saturation density, with implications for the size and composition of neutron stars.
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Accurate Determination of the Neutron Skin Thickness of ${}^{208}{Pb}$ through Parity-Violation in Electron Scattering

https://doi.org/10.1103/PhysRevLett.126.172502

Adhikari, D.; Albataineh, H.; Androic, D.; Aniol, K.; Armstrong, D. S.; Averett, T.; Ayerbe Gayoso, C.; Barcus, S.; Bellini, V.; Beminiwattha, R. S.; et al (April 2021, Physical Review Letters)
null (Ed.)
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