Bulletin of the American Physical Society
2017 Fall Meeting of the APS Division of Nuclear Physics
Volume 62, Number 11
Wednesday–Saturday, October 25–28, 2017; Pittsburgh, Pennsylvania
Session FE: Spectroscopy of Exotic Nuclei via Proton Removal |
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Chair: Alexandra Gade, Michigan State University Room: Salon 5 |
Thursday, October 26, 2017 4:00PM - 4:36PM |
FE.00001: Spectroscopy of Exotic Nuclei via Proton Removal Invited Speaker: Daniel Bazin Inverse kinematics proton removal reactions using light targets are now well established as a powerful tool for spectroscopy of neutron-rich nuclei. The peripheral nature of these so-called knockout reactions enables the use of simple eikonal models to calculate single-particle cross sections and deduce spectroscopic factors. Exclusive experiments have shown these models to predict the relative proportions of the different components of the cross sections very accurately. However, these models have limitations such as the absence of core excitations for instance, and benchmarking the deduction of spectroscopic factors remains a challenging task. In particular, differences with respect to other reactions tools such as transfer reactions or quasi-free proton and electron scattering, are still unexplained. This talk will concentrate on establishing the current status of knockout reaction mechanism studies and benchmarking efforts. [Preview Abstract] |
Thursday, October 26, 2017 4:36PM - 5:12PM |
FE.00002: Spectroscopy of Exotic Nuclei via Quasi-free Scattering Reactions Invited Speaker: Stefanos Paschalis In the work presented here we are interested in examining the single-particle strength of nucleons in stable and exotic nuclei and the reduction compared to the independent particle model. The motivation for this work has been the reported reduction of single-particle strengths and in particular the dependency of this reduction as a function of isospin asymmetry expressed in terms of nucleon separation energies. In particular, in (e,e’p) experiments single-particle strengths of the order of 60-70%. In more recent experiments study was extended to exotic nuclei using nuclear knockout reactions. Consistent results with the (e,e’p) experiments were reported for nuclei close to stability but with a strong dependency of the single-particle strength on the proton-neutron asymmetry. The origin of this strong asymmetry is not fully understood and results from transfer reactions do not support this evidence. In this work I will present our results where quasi-free scattering reactions have been extended and used in inverse kinematics with radioactive beams and a hydrogen-rich target. In particular, I will discuss results on the single-particle structure of stable and exotic nuclei along the oxygen isotopic chain from an experiment that was carried out at the R3B/LAND setup at GSI, Germany, and discuss the dependency on neutron/proton separation energy as well as possible dependencies on the reaction theory used for extracting this nuclear structure information. [Preview Abstract] |
Thursday, October 26, 2017 5:12PM - 5:48PM |
FE.00003: Exotic nuclei studied via the (d,$^3$He) reaction with “fast” and “not-so-fast” beams Invited Speaker: Alan Wuosmaa Proton-removal reactions open a window to the properties of exotic neutron-rich nuclei that is complementary to neutron-adding reactions that have been the focus of considerable recent study. Nucleon removal probes not only the states populated in the final nucleus, but also the ground-state wave function of target, and can reveal connections between the initial and final states as well as providing detailed information about the filling of nuclear shells. For exotic nuclei, reactions typically must be performed in inverse kinematics with weak secondary beams. While the reduced beam intensities introduce technical challenges, the inverse-kinematic regime gives access to additional experimental observables that can provide clean signatures for weak transitions that might otherwise not be visible. I will describe two examples of neutron-rich nuclei studied with the proton-removing (d,$^3$He) reaction studied with different approaches: possible proton-intruder configurations in neutron-rich boron isotopes $^{13,14}$B produced from $^{14,15}$C beams near the Coulomb barrier, and a new determination of the properties of the “super-heavy” isotope of hydrogen $^5$H from “fast” $^6$He beams. [Preview Abstract] |
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