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 2WEA: R-process in the Era of Neutron Star Merger Observations I |
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Chair: Toshitaka Kajino, National Astronomical Observatory of Japan Room: Hilton King's 1 |
Tuesday, October 23, 2018 2:00PM - 2:30PM |
2WEA.00001: GW170817: Optical and Infrared Observations and Kilonova Invited Speaker: Masaomi Tanaka The first gravitational wave (GW) observation from a neutron star merger was successfully made for GW170817. The detection triggered electromagnetic (EM) wave observations over the entire wavelength range, which enabled the first identification of an EM counterpart of a GW source. In optical and infrared wavelengths, the counterpart shows characteristic properties of "kilonova", EM emission powered by radioactive decays of newly synthesized r-process elements. In this talk, I present optical and infrared observations of GW170817 and summarize what we have learned about r-process nucleosynthesis by neutron star mergers. Then, I highlight open questions and future prospects toward understanding the origin of r-process elements in the Universe. |
Tuesday, October 23, 2018 2:30PM - 3:00PM |
2WEA.00002: Constraining neutron-capture reactions for the astrophysical r process Invited Speaker: Artemis Spyrou Neutron star mergers were recently found to be the only confirmed site for the astrophysical r process. This important discovery provided many answers regarding the possible r-process conditions and the synthesis of about half of the isotopes of the heavy elements in the Universe. However, it also created a large number of new questions and opportunities for nuclear physics. In my talk I will focus on some of the experimental aspects of these new opportunities. I will discuss the importance of neutron-capture reactions in the r process, and recent efforts to provide constraints using indirect techniques, in particular usinng the $\beta$-Oslo method. I will also discuss a new aspect of the r-process that was found in the recent GW170817 neutron-star merger observation, namely the kilonova afterglow of the event. I will present nuclear physics needs that can impact the interpretation of the observed electromagnetic spectra associated with the kilonova. The relevant experimental work discussed here was performed at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University using the $\gamma$-calorimeter SuN. Future plans for exciting new opportunities at FRIB will also be discussed. |
Tuesday, October 23, 2018 3:00PM - 3:30PM |
2WEA.00003: Experiments relevant to r-process nucleosynthesis at RIBF Invited Speaker: Shunji Nishimura The rapid neutron capture process (r process), sequence of neutron capture and β-decay process, is known to be responsible for the synthesis of approximately half of nuclides heavier than iron. Recently, binary neutron star coalescence candidate was discovered together with an evidence of a kilonova powered by the radioacitive decay of r-process nuclei in the ejecta. Experimental measurements for the masses, the neutron capture rates, the β-decay rates, and β-delayed neutron emission probabilities of very neutron-rich nuclei are required to understand the mechanism of the r-process nucleosynthesis. We will present the high-lights and future perspectives of the RIBF experimental programs relevant to the r-process nucleosynthesis. |
Tuesday, October 23, 2018 3:30PM - 4:00PM |
2WEA.00004: COFFEE BREAK
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