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 1WKA: Evolution of Nuclear Properties Towards the Drip Lines: Reaction Studies with Large-acceptance Spectrometers I |
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Chair: Takashi Nakamura, Tokyo Institute of Technology Room: Hilton Queen's 4 |
Tuesday, October 23, 2018 9:00AM - 9:30AM |
1WKA.00001: Energy Spectrum of Neutron-Rich Helium Isotopes: Complex Made Simple Invited Speaker: Kevin Fossez Open quantum systems that are at or beyond the limit of particle-emission stability exhibit generic features stemming from their coupling to an environment of positive energy states and decay channels. In this talk, I will introduce a practical approach inspired by halo effective field theory for the description of neutron-rich helium isotopes 5-10He within tens of keV uncertainties and discuss the parity inversion in 9He, as well as the possible two-neutron decay of 10He. The possible extension of this strategy to heavier nuclei as an alternative to ab initio methods will be discussed. |
Tuesday, October 23, 2018 9:30AM - 10:00AM |
1WKA.00002: Invariant mass spectroscopy of neutron-rich nuclei with large acceptance spectrometer SAMURAI Invited Speaker: Hideaki Otsu SAMURAI magnetic spectrometer was constructed in RIBF facility, RIKEN, aiming at providing spectroscopic studies using radioactive isotope secondary beam with inverse kinematics. Variety of detector devices[1] upstream and downstream of SAMURAI magnet enable us to perform kinematically complete measurement by detecting multiple particles emitted on the reaction in coincidence. |
Tuesday, October 23, 2018 10:00AM - 10:30AM |
1WKA.00003: Two Decadal Survey of Unbound Nuclei with the Mona-lisa Detector: Past, Present and Future Outlook Invited Speaker: Paul L Gueye The MoNA Collaboration, which is comprised of 11 institutions, has been involved at the National Superconducting Cyclotron Laboratory (NSCL) for almost two decades. It has established itself as a leader in the understanding of the nuclear structure from the study of neutron unbound nuclei primarily through nuclear breakup or particle removal reactions. Such studies complement those at other facilities using ion beams and electromagnetic probes. The Collaboration designed and constructed theModular Neutron Array/Large Institutional Scintillator Array (MoNA-LISA)capable of measuring 50-250 MeV neutrons with an efficiency around 70%. The MoNA-LISA detector was housed in the N2 vault of NSCL where it was coupled to a large gap 4 Tm Sweeper magnet bending particles around a 43.3ocentral trajectory before entering a charged detector system for tracking and particle identification. The entire system allows to reconstruct the decay energy of unbound nuclei using the invariant mass technique. A portion of the MoNA-LISA-Sweeper system is being relocated to the S2 vault and other parts will contribute to the upcoming Facility for Rare Isotope Beams (FRIB) to replace the NSCL coupled cyclotron facility. When completed, FRIB will become an unprecedented low energy nuclear physics facility to study neutron rich nuclei with heavy ion beams. Highlights of some experiments conducted in N2 along with new developments currently underway to improve the current capability for S2 and HRS will be presented and discussed. |
Tuesday, October 23, 2018 10:30AM - 11:00AM |
1WKA.00004: COFFEE BREAK
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