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 3WAB: New Results and Prospects of Time Projection Chambers for Low-energy Nuclear Physics IIInvited Workshop
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Chair: Daisuke Suzuki, RIKEN Nishina Center Room: Hilton Waikoloa Village Kings 1 |
Monday, November 27, 2023 11:00AM - 11:30AM |
3WAB.00001: Development of CAT-M for experiments with high-intensity heavy-ion beams Invited Speaker: Shinsuke Ota Gaseous active target based on a time projection chamber (TPC) is a device in which the reaction target itself also acts as a detection device, and enables us to measure low-energy recoil particles without reducing the target thickness. A variety of reactions, such as inelastic scattering, transfer reaction, and other reactions, can be studied by changing the type of gas. |
Monday, November 27, 2023 11:30AM - 12:00PM |
3WAB.00002: Active-Target Detectors at the Current-Generation Radioactive-Beam Facilities in North America Invited Speaker: Tan Ahn Active target detectors are well poised to take advantage of the beams available at the current generation of radioactive beam facilities and university-based laboratories. In this talk, I will focus on some of the activities at the national-user facilities in the US, namely ATLAS at Argonne National Laboratory, and the Facility for Rare Isotope Beams (FRIB) at Michigan State University. Experiments at these facilities explore the science capable at energies below and around the Coulomb barrier, above the Coulomb barrier, and fast beam energies for mostly light but also some medium-heavy nuclei. A few experiments will be presented that aim to study single-particle shell structure and collective phenomena such as giant resonances. There are aspects of these experiments that will push the limits of what is possible with active targets. A few topics that may be the next steps in the evolution of active target experiments will be presented. |
Monday, November 27, 2023 12:00PM - 12:30PM |
3WAB.00003: OEDO: Recent Studies using Energy-Degraded Beams and Future Perspectives Invited Speaker: Thomas Chillery The optimized energy-degrading optics (OEDO) beamline promotes study of slowed-down radioactive ion (RI) beams provided by the BigRIPS separator at RIKEN RI beam factory (RIBF), Japan. Primary beam from the RIBF SRC cyclotron undergoes in-flight fission and/or projectile-fragmentation by bombarding a 9Be target, and the secondary beam of interest is separated by BigRIPS with kinetic energy between 120 – 170 MeV/nucleon depending on the experiment. This high-energy secondary beam is transported to OEDO, which features two beamline components used to achieve a focused low-energy (< 30 MeV/nucleon) beam at the secondary target. The first is an angle-tunable wedge-shaped aluminum degrader, which allows to reduce the beam energy and maximize the energy compression on target. The second is a radio-frequency deflector (RFD) which acts as a time-dependent focusing tool for both compressing the beam spot size and “kicking out” beam contaminants. Experiments performed at OEDO may also use the SHARAQ spectrometer located downstream of the target to momentum-analyze and identify reaction products. In recent years the OEDO-SHARAQ beamline has been essential in several reaction studies using low-energy beams, typically employing the surrogate approach. In future, the low-energy RI beams achievable at OEDO may be combined with an active target and time-projection chamber (AT-TPC) for nuclear structure and/or nuclear astrophysics studies. This talk will cover the BigRIPS-OEDO-SHARAQ beamline, summarise the current status of recent experiments, and consider potential uses of a future AT-TPC installed on the OEDO beamline. |
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