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 LC: Nuclear Reactions : Light Ions II |
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Chair: Yukie Maeda, Miyazaki University Room: Hilton Kohala 2 |
Saturday, October 27, 2018 9:00AM - 9:15AM |
LC.00001: Kinematically Complete Three-Body Photodisintegration of 3He Forrest QL Friesen, Mohammed W Ahmed, Benjamin Crowe, Alexander S Crowell, Arnoldas Deltuva, Calvin R Howell, Collin R Malone, Ronald C Malone, Werner Tornow, Henryk Alojzy Witala This experiment provides the first data for exclusive three-body |
Saturday, October 27, 2018 9:15AM - 9:30AM |
LC.00002: Neutron-neutron quasifree scattering in neutron-deuteron breakup Ronald C Malone, Benjamin Crowe, Alexander S Crowell, Laurie C Cumberbatch, Brent A Fallin, Forrest QL Friesen, Calvin R Howell, Collin R Malone, Diane M Markoff, David R Ticehurst, Werner Tornow, Henryk Alojzy Witala The neutron-deuteron (nd) breakup reaction provides a rich environment for testing models of the neutron-neutron (nn) interaction. Current theoretical predictions based on rigorous ab-initio calculations accurately describe most three-nucleon scattering data. One exception is the cross section for nn quasifree scattering (QFS) in nd breakup. Theoretical calculations underpredict recent measurements of the nn QFS cross section by more than 15%. This implies a large charge-symmetry breaking effect. We are conducting new measurements of the nn QFS cross section at the Triangle Universities Nuclear Laboratory. The measurements are performed using two substantially different setups to assess systematic errors in the methods: the first uses shielded detectors with an open neutron source producing neutrons at 10 MeV and the second uses unshielded detectors with a collimated beam of 16 MeV neutrons. Time-of-flight techniques are used to determine the energies of the two neutrons detected in coincidence. A description of the experimental methods and preliminary results will be presented. |
Saturday, October 27, 2018 9:30AM - 9:45AM |
LC.00003: Measurement for p–3He elastic scattering with a 65 MeV polarised proton beam Shinnosuke Nakai, Kimiko Sekiguchi, Kenjiro Miki, Atomu Watanabe, Shun Shibuya, Morihiro Watanabe, Kenta Kawahara, Daisuke Sakai, Yasunori Wada, Masatoshi Itoh, Kichiji Hatanaka, Atsushi Tamii, Nobuyuki Kobayashi, Azusa Inoue, Shoken Nakamura, Tomotsugu Wakasa, Shinji Mitsumoto, Hisanori Ohshiro, Shuhei Goto, Yukie Maeda, Hideyuki Sakai, Tomohiro Uesaka, Takashi Wakui One of the most important topics of the nuclear physics is to understand various nuclear phenomena based on the nucleon-nucleon interactions combined with three-nucleon forces (3NFs). It should be interesting to see how 3NFs act in p–3He scattering. In this system, one could study 3NFs effects in 4-nucleon scattering, and also approach to 3NFs with the iso-spin channels of T=3/2. In order to study 3NFs effects in p–3He elastic scattering, we performed the measurement of the cross section and the proton analyzing power at 65 MeV with a polarized proton beam at Research Center for Nuclear Physics (RCNP), Osaka University. The gaseous 3He target was bombarded by a polarized proton beam, and scattered protons were detected by using the E − ∆E detectors which consisted of plastic and NaI(Tl) scintillators. Measured angles were 20◦ −165◦ in the laboratory system (26.9◦ −170.1◦ in the center of mass system). The typical beam polarizations were 50 % throughout the experiment. We also measured the cross section for pp elastic scattering with the same experimental setup in order to estimate the overall systematic uncertainties. In the conference, we will report on the obtained data combined with the theoretical calculations. |
Saturday, October 27, 2018 9:45AM - 10:00AM |
LC.00004: Measurement of the Two-Halo Neutron Transfer Reaction 11Li(p,t)9Li at 62.4 MeV Xuan Wang, Junki Tanaka, Rituparna Kanungo, Alcorta Martin, Harris Bidaman, Christina Burbadge, Steffen Cruz, Barry Daivids, Adiazvar Diaz Varela, Julia Even, Greg Hackman, Jack Henderson, Shigeru Ishimoto, Satbir Kaur, Mathew Keefe, Reiner Krücken, Kyle G Leach, Jon Lighthall, Elizabeth Padilla-Rodal, Jaspreet Singh Randhawa, Alisher Sanetullaev, J. K. Smith, Orry Workman, Isao Tanihata We report the measurement of differential cross section of the 11Li(p,t)9Li reaction performed at TRIUMF. Previous investigation of the reaction was reported at lower energy of 3A MeV [1]. Present data were taken at higher energy where the direct reaction mechanism is expected to be more dominant. It will be shown that the present measurement shows the transition to a higher excited state than the previous report. We used the ISAC-II facility to accelerate 11Li to 62.4 MeV and the IRIS facility was used for measuring the 11Li(p,t) reaction. This experimental data were simultaneously taken with the published experiment of (p,p')[2]. The transition to the second excited state of 9Li was observed for the first time. . The presentation will describe the experiment and analysis. [1] I. Tanihata et al., Phys. Rev. Lett. 100, 192502 (2008). [2] J. Tanaka et al., Phys. Lett B 774, 268 (2017) |
Saturday, October 27, 2018 10:00AM - 10:15AM |
LC.00005: Microscopic analysis based on the g-matrix folding model for reactions involving unstable nuclei Shoya Ogawa, Masakazu Toyokawa, Takuma Matsumoto, Ryo Horinouchi Microscopic understanding of optical potentials for nucleon-nucleus and nucleus-nucleus scattering is a long-standing issue in nuclear reaction theory. The optical potentials are the key to calculate the elastic scattering and reactions, including higher-order processes. The g matrix folding model yields the reliable optical potential based on the nucleon-nucleon interaction, and well describes various scattering of stable nuclei. However, the folding model does not work well for the scattering of unstable nuclei, due to the lack of the breakup effects. In the previous work, we have constructed microscopic optical potential including breakup effects based on the Glauber model. The constructed optical potential is called the Eikonal potential. For deuteron scattering, the validity of the Eikonal potential has been investigated from the comparison with results of the continuum-discretized coupled channels method (CDCC). Indeed, the calculated cross sections with the Eikonal potential reproduce well those with CDCC. In this study, we apply Eikonal potential to reactions of one or two neutron halo nuclei, and investigate the validity by comparing with results of CDCC. In this conference, we will report these results and discuss applicability to breakup reactions. |
Saturday, October 27, 2018 10:15AM - 10:30AM |
LC.00006: Fragmentation cross-sections of C and Al targets by 400MeV/u 16O Mohammad Sabra
We have calculated the fragmentation cross-sections of fragments with Z = 1 - 9 in the interaction of 400MeV/u 16O ions with C and Al targets. Calculations are done using SAPTON model (Scattering And Production Theory Of Nuclei), and are compared with the available experimental data. The calculations are in very good agreement with the data and suggest that the emission of these fragments is dominated by the available phase space and Coulomb barrier. Comparison other models will be presented and discussed. |
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