Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session X11: Mini-Symposium: Developments in Nuclear Physics for Stellar and Explosive BurningMini-Symposium Recordings Available
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Chair: Nabin Rijal, Michigan State University Room: Majestic |
Tuesday, April 12, 2022 10:45AM - 11:21AM |
X11.00001: Developments in Nuclear Physics for Stellar and Explosive Burning Invited Speaker: Mallory K Smith TBD |
Tuesday, April 12, 2022 11:21AM - 11:33AM |
X11.00002: Recent measurements with the Rhinoceros Gas Target at Notre Dame Dan W Bardayan The combination of the Rhinoceros windowless gas target with the 5U high-current accelerator at the Notre Dame Nuclear Science Lab provides an ideal tool for measuring cross sections of astrophysical interest involving gaseous targets. The beam/target interaction point is viewed by arrays of highly-collimated silicon detectors and Ge detectors for the measurement of multiple reaction products. Rhino was brought to Notre Dame in 2005 and was recently upgraded with a modern control system along with other improvements. Recent measurements with Rhino include a study of the 20Ne(α,p)23Na reaction, which is of interest to nucleosynthesis in type 1a supernovae, and the 15N(α,γ)19F reaction to study 19Ne mirror levels affecting 18F production in novae. The experimental system and recent results will be presented. |
Tuesday, April 12, 2022 11:33AM - 11:45AM |
X11.00003: Re-examination of the 6Li(p, γ)7Be reaction rate in the light of the new LUNA data Roman Y Kezerashvili, Alessya S Tkachenko, Natalya A Burkova, Sergei B Dubovichenko, Albert V Dzhazairov-Kakhramanov
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Tuesday, April 12, 2022 11:45AM - 11:57AM |
X11.00004: Feasibility Studies for Measuring the Astrophysical S-Factor of the Reaction 12C(α,γ)16O via Electro-Disintegration at MAGIX Stefan J Lunkenheimer The nucleosynthesis reaction 12C(α,γ)16O is of utmost importance in nuclear astrophysics. The S-factor of this reaction is a major parameter for determining the abundance ratio of oxygen to carbon in stellar nucleosynthesis, which in turn plays a crucial role in understanding pre-supernova evolution. Since the cross section of the reaction 12C(α,γ)16O is low, a high-precision low-energy experiment with a high luminosity is required to measure the S-factor. One such experiment that aims at measuring this important and challenging quantity is MAGIX. |
Tuesday, April 12, 2022 11:57AM - 12:09PM |
X11.00005: Experimental constraints to nuclear processes in accreting neutron stars Alfredo Estrade, Irin Sultana Low-mass X-ray binaries are systems rich in observational phenomena valuable to constrain theoretical models of neutron stars and matter in extreme density environments. Several of these phenomena have an origin on nuclear processes that involve unstable isotopes, both on the neutron-rich and proton-rich side of beta-stability. A new generation of experimental facilities, such as the Facility for Rare Isotope Beams (FRIB), will make many of these short-lived isotopes accessible to experiments for the first time. We will discuss a reaction network calculation performed to evaluate how the uncertainty of nuclear reaction rates for proton-rich isotopes affect models for the nuclear processes driving type I X-ray bursts. We will also discuss recent results and plans of our program of mass measurements of neutron-rich isotopes, which are key to understand the nuclear composition and thermal profile of neutron star crusts. |
Tuesday, April 12, 2022 12:09PM - 12:21PM |
X11.00006: Low energy study of 20Ne+24Mg fusion to understand the crustal heating in the accreting neutron stars Jaspreet S Randhawa, Tan Ahn, Dan W Bardayan, Drew Blankstein, Chevelle Boomershine, Scott R Carmichael, James J Kolata, Javier Rufino, Jack Wilson, Patrick D O'Malley Pycnonuclear reactions occur in a highly dense matter when nuclei are frozen in lattice structures. One such site is the crust of accreting neutron stars where the pycnonuclear burning is a potential heat source. Fusion of Ne and Mg are among the most important pycnonuclear reactions in neutron star crusts. In the absence of any fusion data in this mass region, theoretical predictions at very low energies are highly sensitive to extrapolation. Therefore, measurements below the barrier are required to constrain the extrapolation and distinguish between various theoretical model predictions. We will present the first results of the 20Ne+24Mg fusion cross-sections measured using newly commissioned active target ND-CUBE at the University of Notre Dame. Implications of new results for the pycnonuclear burning as a heat source in the neutron star crust will be discussed. |
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