Bulletin of the American Physical Society
89th Annual Meeting of the Southeastern Section of the APS
Volume 67, Number 18
Thursday–Saturday, November 3–5, 2022; University of Mississippi, University, MS
Session C03: Advances in Nuclear Structure I |
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Chair: Benjamin Crider Room: University of Mississippi Ballroom C |
Thursday, November 3, 2022 2:00PM - 2:30PM |
C03.00001: Precise determinations of neutron skin in doubly magic nuclei Invited Speaker: Ciprian Gal A wide variety of nuclear structure models have successfully described current experimental data and make predictions used in many areas of physics. The difference between the average extent of neutrons and the average extend of protons in a heavy nucleus (commonly named neutron skin) is such a quantity. This talk will give an overview of the recently published experimental results from the PREX and CREX collaborations. These advantage of these measurements lies in the use of an electroweak probe to measure these quantities, significantly reducing uncertainties from theoretical interpretations. The doubly magic nuclei 208Pb and 48Ca were used to constrain both Density Functional Theory and ab-initio calculations. |
Thursday, November 3, 2022 2:30PM - 3:00PM |
C03.00002: The first experiment at FRIB Decay Station initiator (FDSi) Invited Speaker: Zhengyu Xu Atomic nuclei are quantum many-body systems consisting of two types of fermions -- proton and neutron. The exact solution to such systems is generally impossible. One of the most successful models to date, the nuclear shell model, simplifies the problem by assuming each proton or neutron moves independently in a mean field produced by all the other nucleons inside the nucleus. The resulting nuclear shell structure and magic numbers, such as Z or N=2, 8, 20, 28, 50, and 82, succeeded in interpreting the nuclear data taken near the stability line. In the last three decades, however, the advent of radioactive ion beams allowed the production and investigation of short-lived isotopes with extreme proton-neutron ratios. Unexpected properties have been observed in those nuclei compared to their stable counterparts, including the alterations of the shell structure and magic numbers. It has become a continuing effort in both experiments and theories to understand nuclear structure under extreme conditions. |
Thursday, November 3, 2022 3:00PM - 3:30PM |
C03.00003: Nuclear-structure studies with direct reactions and particle-gamma coincidences at FSU and NSCL Invited Speaker: Mark Spieker If carefully chosen, single-nucleon transfer and light-ion inelastic scattering experiments can provide enhanced selectivity to specific nuclear structure phenomena. In this invited talk, I will present an overview of direct-reaction studies performed at the John D. Fox Laboratory of Florida State University and at the National Superconducting Cyclotron Laboratory (NSCL) of Michigan State University. |
Thursday, November 3, 2022 3:30PM - 3:42PM |
C03.00004: Half-life measurements of isomeric states in 37Si following decay of neutron-rich 37, 38Al isotopes Timilehin H Ogunbeku, Benjamin P Crider, Sean N Liddick, Aaron Chester, Katherine L Childers, Partha Chowdhury, Edward Lamere, Rebecca Lewis, Brenden R Longfellow, Rebeka Sultana Lubna, Stephanie M Lyons, Shree K Neupane, David Perez-Loureiro, Christopher J Prokop, Andrea L Richard, Umesh Silwal, Durga P Siwakoti, Dylan C Smith, Mallory Smith, Yongchi Xiao Nuclear transition rates are sensitive probes for identifying differences in the underlying configurations of nuclei. One method to measure half-lives is through the direct measurement of the time delay between two emitted radiations following β decay. A β-decay experiment was performed at the National Superconducting Cyclotron Laboratory (NSCL) to study the β decay and β-delayed neutron decay daughters of several isotopes including 37, 38Al isotopes found near the neutron-rich N=20 “island of inversion.” Radioactive nuclei were implanted within a thin, position-sensitive CeBr3 detector and β-delayed radiation was correlated to the implanted nuclei. Ancillary arrays surrounding the CeBr3 detector were used for γ-ray detection, including 15 LaBr3 (Ce) detectors for fast-timing measurements. Preliminary results of half-lives of isomeric states populated following the β decay and β-delayed neutron decay of implanted aluminum isotopes will be presented. |
Thursday, November 3, 2022 3:42PM - 3:54PM |
C03.00005: Constraining the Astrophysical p Process: Cross Section Measurement of the 84Kr(p,γ)85Rb Reaction in Inverse Kinematics Alicia R Palmisano-Kyle, Artemis Spyrou, Paul A Deyoung, Alexander C Dombos, Orlando J Olivas-Gomez, Caley M Harris, Sean N Liddick, Stephanie M Lyons, Jorge Pereira, Andrea L Richard, Anna Simon, Mallory K Smith, Artemis Tsantiri, Remco G Zegers, Panagiotis Gastis One of the biggest questions in nuclear astrophysics is understanding where the elements come from and how they are made. This work focuses on the p process, a nucleosynthesis process that consists of a series of photodisintegration reactions responsible for producing stable isotopes on the proton-rich side of stability. These nuclei, known as the p nuclei, cannot be made through the well-known neutron-capture processes. Currently p-process models rely heavily on theory to provide the relevant reaction rates to predict the final p-nuclei abundances and more experimental data is needed. The present work reports on an experiment performed with the SuN detector at the National Superconducting Cyclotron Laboratory, NSCL, at Michigan State University using the ReA facility to measure the 84Kr(p,γ)85Rb reaction cross section in inverse kinematics. The reverse 85Rb(γ,p)84Kr reaction is a branching point in the p-process reaction network that was highlighted as an important reaction in sensitivity studies in the production of the 78Kr p nucleus. A new hydrogen gas target was designed and fabricated and a new analysis technique for background subtraction and efficiency calculations of the detector were developed. The experimental cross section is compared to standard statistical model calculations using the NON-SMOKER and TALYS codes. |
Thursday, November 3, 2022 3:54PM - 4:06PM |
C03.00006: E17011 experimental setup, and efficiency comparison between simulated and experimental results Sapan Luitel, Jeff A Winger, Benjamin P Crider, Ben Clarke The goal of experiment E17011 at the National Superconducting Cyclotron Laboratory (NSCL) was to observe the E0 decay of the 02+→01+ transition to determine the half-life of the 02+ state in 80Ge. The NSCL implanted a radioactive source into a position-sensitive Cerium Bromide (CeBr3) scintillator, and the beta decay of the source populates the excited states in the daughter nuclei. An array of 16 LaBr3(Ce) detectors and the 16 Segmented Germanium Array (SeGA) detectors were used to detect the delayed γ rays. Understanding the detector array's efficiency is a critical component of the experimental analysis. A simulation of detector efficiency was carried out using GEANT4. The status for the comparison of simulated and experimental efficiencies of E17011 experiment, as well as other similar experiments, will be discussed. |
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