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 1WFA: Time-projection Chambers for Radioactive Isotope Beams I |
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Chair: Daisuke Suzuki, RIKEN Nishina Center Room: Hilton King's 2 |
Tuesday, October 23, 2018 9:00AM - 9:30AM |
1WFA.00001: Study of spectroscopic factors at N=29 using isobaric analog resonances in inverse kinematics Invited Speaker: Daniel Bazin A measurement was recently performed at the National Superconducting Cyclotron Laboratory on resonant proton scattering of $^{46}$Ar in inverse kinematics in the region of isobaric analog states of $^{47}$Ar. The experiment was performed using a re-accelerated $^{46}$Ar radioactive beam at 4.6 MeV/u from the ReA3 linac after production via the projectile fragmentation of a $^{48}$Ca primary beam from the Coupled Cyclotron Facility. This beam was injected into the Active Target Time Projection Chamber where the reaction took place on an isobutane target and the scattered protons were detected. Four candidate resonances were observed, two of which corresponding to the isobaric analogs of $^{47}$Ar ground and first excited states. Spectroscopic factors were deduced from the strength of these resonances and compared to values in the literature. This novel experimental method to extract spectroscopic information from proton elastic scattering on radioactive nuclei will be presented, as well as the analysis methods used to extract results from the data. |
Tuesday, October 23, 2018 9:30AM - 10:00AM |
1WFA.00002: Measurement of 10C(α,α') with the MAIKo active target Invited Speaker: Tatsuya Furuno In the present talk, we will report the measurement of 10C(α,α') reaction at 75 MeV/u using the MAIKo active target to search for alpha cluster structures in unstable 10C nuclei. Alpha cluster structure have beem widely examined among Z=N=2n self-cojugate nuclei. When excess nucleons are added to such nuclei, these nucleons occupy the molecular orbitals between the alpha cores and exhibit new variety of molecular structures. In addition, recent theoretical study predicts that the comparison between the isobaric analog states will unveil the inner structures of cluster states [1]. Therefore, we proposed to investigate alpha cluster structures in 10C which is the mirror nucleus of 10Be. Measurement of monopole strengths is a usuful method to search for alpha cluster structures [2]. Missing mass spectroscopy of alpha inelastic scattering, which has been successfully applied among stable nuclei to measure monopole strengths, should be perfoemed for unstable 10C. However, such a measurement requires the detection of low-energy (~1 MeV) recoil alpha particles which is not possible with a normal setup. To realize the detection of low-energy recoil particles, we have developed a new active target system MAIKo at RCNP. The system consists of a time projection chamber (TPC) in which the detection medeum is used also for the target gas. Since the reaction occurs inside the detector, the detection threshold can be lowered. In MAIKo, we utilize the micro-pixel chamber (μ-PIC) to multiply and detect the drift electrons. μ-PIC is one type of micro-pattern gaseous detectors which is developed at Kyoto University. [1] M. Ito, EPJ web of Conferences 117, 06014 (2016). [2] T. Kawabata et al., Physics Letters B 646, 6 (2007).
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Tuesday, October 23, 2018 10:00AM - 10:30AM |
1WFA.00003: Active-target Time Projection Chamber (AT-TPC) and transfer reactions Invited Speaker: Jaspreet Singh Randhawa In the last two decades, experiments with radioactive ion beams have provided a new perspective to the nuclear shell structure as the conventional shell gaps are found to disappear as one moves away from the valley of stability. Shell closures in the neutron-rich nuclei are crucial to understanding the formation of heavier elements in astrophysical r-process. A new global view of nuclear shell evolution is emerging which requires continued experimental efforts. Transfer reactions have been an important tool in the reaction spectroscopy of nuclei away from stability. However, experiments with rare isotope beams have to push the limits of low beam intensities and low cross sections to further extremes in order to study cases of highest interest. Active-Target Time Projection Chamber (AT-TPC) addresses these limitations by providing higher luminosity to access reactions with low beam intensities as AT-TPC can use thick targets without compromising on energy and angular resolution. Use of gas as target (and tracking) material provides access to the most important light targets, such as p, d, 4He, and even 3He. These are the most important targets for nuclear spectroscopy. Transfer reactions with AT-TPC using both stable and radioactive ion beams will be discussed with a focus on planned experiments. New possibilities with the ReA6 facility at NSCL will be examined. |
Tuesday, October 23, 2018 10:30AM - 11:00AM |
1WFA.00004: COFFEE BREAK
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