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 1WKB: Evolution of Nuclear Properties Towards the Drip Lines: Reaction Studies with Large-acceptance Spectrometers II |
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Chair: Takashi Nakamura, Tokyo Institute of Technology Room: Hilton Queen's 4 |
Tuesday, October 23, 2018 11:00AM - 11:30AM |
1WKB.00001: Missing mass spectroscopy with large acceptance spectrometer SAMURAI Invited Speaker: Yuki Kubota SAMURAI (Superconducting Analyzer for Multi-particles from Radioisotope beams) is a large-acceptance multi-particle spectrometer[1] at RIKEN RIBF. The main part of the system is a superconducting dipole magnet with 7 Tm bending power for the momentum analysis of heavy projectile fragments including protons. The 80-cm gap also enables measurements of multi neutrons with beam rapidity. This system is suitable for various radioactive-beam experiments such as electromagnetic dissociation including radiative-capture reactions, various direct reactions as well as polarized-deuteron-induced reactions and EoS studies. We started experimental campaign in SAMURAI with a series of invariant-mass measurements by taking advantage of the common experimental setup. Although the invariant-mass spectroscopy is a powerful tool to study low-lying unbound states, both the resolution and the efficiency drop down with increasing the excitation energy. This difficulty can be overcome by employing the complementary technique, the missing-mass spectroscopy. Since 2014, 8 missing-mass measurements have been conducted. The large acceptance of SAMURAI enables not only to minimize the experimental biases but also to tag the decay modes which is technically important to make a trigger with an intense beam. It should be noted that the energy and the scattering angle of the recoil particle to be detected are widely ranged in the laboratory frame and the kinematics strongly depends on the interest. It causes a technical difficulty to share the experimental setup among different measurements. In this talk, recent physics results as well as future perspectives will be presented.
References [1] T. Koyabashi et al., Nucl. Instr. Meth. Phys. Res. B 317, 294 (2013). |
Tuesday, October 23, 2018 11:30AM - 12:00PM |
1WKB.00002: Experimental study of density dependent symmetry energy at RIBF-SPiRIT experiment Invited Speaker: Tadaaki Isobe The nuclear Equation of State (EoS) is a fundamental property of nuclear matter that describes the relationships between the parameters of the system, such as energy, density and temperature. The equation consists of the term describes the symmetric matter (N=Z) and the term describes the asymmetric matter (N≠Z), which has large uncertainty though it affects many aspects of nuclear physics and astrophysics. |
Tuesday, October 23, 2018 12:00PM - 12:30PM |
1WKB.00003: The High Rigidity Spectrometer for FRIB Invited Speaker: Shumpei Noji A new High Rigidity Spectrometer (HRS) has been proposed as the first major addition to the Facility of Rare Isotope Beams (FRIB) experimental facilities. Its high magnetic rigidity (8 Tm maximum) matches the rigidities at which production rates of rare-isotope beams (RIBs) via projectile fragmentation or in-flight fission are optimized across the entire nuclear chart, and hence maximizes the potentiality of the fast-beam experimental program. In combination with the ability to use thicker reaction targets at the higher rigidities, luminosity gain will be by a factor of 2 to 100 for over 90% of experiments with neutron-rich RIBs (with the largest gains for the most neutron-rich isotopes), compared to what is possible with the existing spectrometers at NSCL (4 Tm maximum). This enhancement will offer unprecedented discovery potential by providing access to critical isotopes that are not available otherwise. The HRS consists of the High-Transmission Beam Line, through which RIBs that are produced and separated in the Fragment Separator are transported to the reaction target with minimal losses, and the Spectrometer Section, which analyzes the reaction product with large angular and momentum acceptances and high resolution that are achieved simultaneously. The HRS can accommodate different ion-optical modes, and run experiments in conjunction with major auxiliary detectors such as the Gamma Ray Energy Tracking Array (GRETA) and the Modular Neutron Array (MoNA-LISA). In this presentation, an overview of the scientific opportunities with the HRS and the present layout of the HRS will be given. |
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