Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session Z04: Nuclear Reactions: Heavy-Ions/Rare Isotope Beams and Hadrons/Light IonsRecordings Available
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Sponsoring Units: DNP Chair: Senta V. Greene, Vanderbilt Univ Room: Salon 2 |
Tuesday, April 12, 2022 3:45PM - 3:57PM |
Z04.00001: Impact of shell structure on the fusion of neutron-rich mid-mass nuclei with oxygen nuclei Romualdo T Desouza, Varinderjit Singh, Sylvie Hudan, D. Ackermann, Abdelouahad Chbihi, Austin Abbott, Andy Hannaman, Alan B McIntosh, Maxwell Q Sorensen, Zachary Tobin, Aditya Wakhle, Sherry J Yennello, Michael A Famiano, Kyle W Brown, Clémentine Santamaria, Jesus Lubian, Hugo Soler, Brett V Carlson The influence of shell effects on fusion of mid-mass nuclei is explored using isotopic chains of K and Ar ions on an oxygen target. Comparison of the reduced excitation functions reveals that the fusion cross section for the open neutron-shell projectile nuclei 41K and 45K is systematically larger than for the closed neutron-shell projectiles 39K and 47K. The São Paulo fusion model using matter densities from systematics fails to describe the measured excitation functions. Use of more realistic densities from a Dirac-Hartree-Bogoliubov (DHB) approach performs significantly better though it still overpredicts the closed-shell nuclei. |
Tuesday, April 12, 2022 3:57PM - 4:09PM |
Z04.00002: Assessing the impact of valencesdneutrons and protons on fusion Sylvie Hudan, Varinderjit Singh, Romualdo T Desouza Experimental near-barrier fusion cross sections for 17F+12C are compared to the fusion excitation functions for 16,17,18O, 19F, and 20Ne ions on a carbon target. Normalized or reduced fusion cross sections are utilized in order to compare the different systems and account for the differing static size of the incident ions as well as changes in fusion barrier. Fusion excitation functions for the case of the mirror nuclei 17F and 17O with a single sd nucleon are compared. The 17F data are also juxtaposed with nuclei involving multiple sd nucleons. Trends of the fusion cross section above the barrier beyond the expected systematic behavior are observed. These trends are interpreted as the interplay of the sdprotons and neutrons. The experimental data are also compared to a widely used analytic model of near-barrier fusion, a time-dependent Hartree-Fock model, and coupled channels calculations. |
Tuesday, April 12, 2022 4:09PM - 4:21PM |
Z04.00003: Direct reactions of 10Be, 10B, and 15N on active target deuterium gas using SOLARIS AT-TPC* Nabin Rijal, Daniel Bazin, Zach M Serikow, Jie Chen, Yassid Ayyad, Wolfgang Mittig, Clementine A Santamaria Direct reactions are powerful probes to study nuclear structure. With a primary goal to establish the importance and unique ability to measure transfer reactions on radioactive beams with low intensities, taking advantage of the high luminosity of the AT-TPC, a radioactive 10Be cocktail beam along with stable 10B and 15N contaminants was delivered by the ReA6 accelerator at NSCL to a 1 m thick pure deuterium gas target at 600 Torr, inside the AT-TPC placed in the SOLARIS solenoid magnet. Multiple reaction channels (d, p), (d, d), (d, t), and (d, α) were detected simultaneously across a wide energy range inside the detector. The preliminary results of the analysis will be presented with an emphasis on the (d, d), and (d, d') channels. Future opportunities and prospects of performing transfer reactions using SOLARIS in the AT-TPC mode with low-intensity exotic FRIB beams will also be discussed. |
Tuesday, April 12, 2022 4:21PM - 4:33PM |
Z04.00004: Insight into the effects of shell structure on the fusion of mid-mass nuclei using isotopic chains of K and Ar nuclei on a Si target James E Johnstone The effects of neutron shell closures on fusion are investigated through measurement of the fusion excitation functions for 36,44Ar/39,41,45,47K + 28Si. At above barrier energies, differences in the measured cross-sections are understood by creating a reduced excitation function which accounts for the size and barriers of the fusing systems. At energies below the Coulomb barrier, however, large enhancement of the cross-section for open-shell projectiles over the closed-shell projectiles is observed. Coupled channel calculations using Dirac-Hartree-Bogoliubov (DHB) densities provide a good description for the closed-shell nuclei but fail to describe the open-shell nuclei. The influence of the target nucleus is explored through comparison of this data to measured cross-sections for the same projectiles on an 16O target. |
Tuesday, April 12, 2022 4:33PM - 4:45PM |
Z04.00005: Measuring the 235U(n,f)/6Li(n,t) cross section ratio in the NIFFTE fissionTPC Maria Anastasiou While nuclear data play an important role in nuclear physics applications, it has become important to have a better understanding and try to minimize their uncertainties. In particular, there is a need for precision neutron-induced fission cross section measurements on fissile nuclei. Neutron-induced fission cross sections are typically measured as ratios, with a well-known standard in the denominator. While the 235U(n,f) standard is well measured, some light particle reactions are also well-known and their use as reference can provide information to remove shared systematic uncertainties that are present in an actinide-only ratio. The NIFFTE collaboration’s fission time projection chamber (fissionTPC) is a 2×2π charged particle tracker designed for measuring neutron-induced fission. Detailed 3D track reconstruction of the reaction products enables evaluation of systematic effects and corresponding uncertainties which are less directly accessible by other measurement techniques. This work focuses on the recent measurement of the 235U(n,f) using as a reference the standard 6Li(n,t) reaction. Preliminary data of the 235U(n,f)/6Li(n,t) measurement deployed at the Los Alamos Neutron Science Center will be presented. |
Tuesday, April 12, 2022 4:45PM - 4:57PM |
Z04.00006: Nuclear Josephson-like γ-emission Gregory Potel Josephson-like junctions, transiently established in heavy ion collisions between superfluid nuclei, few MeV below the |
Tuesday, April 12, 2022 4:57PM - 5:09PM |
Z04.00007: Spin-orbit coupling and P-wave pairing in neutron matter Jiawei Wang, Eckhard Krotscheck, Panagiota Papakonstanitnou The interior of neutron star contains matter in its most extreme form occurring in nature. In 1975, Anderson and Itoh proposed to explain the glitches of pulsar signals, firstly observed in 1969, by pinning and unpinning of vortices in a nuclear superfluid inside the star. Since then, the study of neutron matter, a form of matter made from nucleons and assumed to be inside neutron star, have provided fruitful development of many-body theory. |
Tuesday, April 12, 2022 5:09PM - 5:21PM |
Z04.00008: Differential cross-section measurements of 18O(γ,n)+18O(γ,2n) reactions at 23.7 and 32.0 MeV Collin R Malone, Calvin R Howell, Forrest Q Friesen, Ronald C Malone, Werner Tornow, Sean W Finch, FNU Krishichayan, Diane M Markoff, Mohammad W Ahmed, Arnoldas Deltuva Photoneutron reactions on 18O allow examination of the neutron-neutron (nn) interaction and may be used as a surrogate for planning a 3H photodisintegration experiment at TUNL. The relatively large 18O(g,2n) cross section allows measurements of differential cross-sections for nn coincidences at various opening angles between the neutrons without risks associated with handling a radioactive gas target. Cross sections for the sequential and simultaneous emission of the two neutrons in the 18O(g, nn) reaction are measured. The simultaneous neutron emission provides information about neutron-neutron correlations in the 18O nucleus. Ab-initio calculations are needed to disentangle the simultaneous contribution from the aggregate cross section. |
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