Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session E13: Nuclear Theory IRecordings Available

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Sponsoring Units: DNP Chair: Ingo Tews, Los Alamos National Laboratory Room: Shubert 
Saturday, April 9, 2022 3:45PM  3:57PM 
E13.00001: Quantum Monte Carlo calculations of electron Scattering from ^{12}C in the ShortTime Approximation Lorenzo Andreoli, Saori Pastore, Maria Piarulli, Stefano Gandolfi, Joseph A Carlson The Shorttime approximation has been developed in the context of quantum Monte Carlo calculations to calculate nuclear responses in nuclei with A≥12. This algorithm exploits a factorization scheme to consistently retain twobody physics, both in twobody currents and correlations. 
Saturday, April 9, 2022 3:57PM  4:09PM 
E13.00002: Cold Neutron Capture on the Deuteron in Pionless Effective Field Theory Xincheng Lin, Hersh Singh, Roxanne P Springer, Jared Vanasse Cold neutron capture on the deuteron to create the triton and emit a photon ($nd\to \gamma t$) at low energies is an important process for big bang nucleosynthesis; the time reversed process is relevant for experiments at the Triangle Universities Nuclear Laboratory (TUNL)/High Intensity Gamma Source (HIGS). For momentum transfer well below the pion mass, pionless effective field theory (EFT) is valid and provides a systematic expansion for the calculation of amplitudes. In this work, we calculate the cross section of $nd\to \gamma t$ to nexttoleading order in pionless EFT strictly perturbatively. We will discuss the context of this calculation and its potential impact on polarizationinduced asymmetries. 
Saturday, April 9, 2022 4:09PM  4:21PM 
E13.00003: E1 strength distribution of ^{11}Li in Halo Effective Field Theory Matthias Göbel, Bijaya Acharya, Hans W Hammer, Daniel R Phillips One of the signatures of a halo nucleus is a lowenergy enhancement of the E1 strength distribution, dB(E1)/dE. This observable can be measured in Coulomb dissociation experiments. The E1 strength distribution is sensitive to longdistance properites of the halo state, but it is also affected by finalstate interactions (FSI). 
Saturday, April 9, 2022 4:21PM  4:33PM 
E13.00004: Lowenergy effective field theory of the deuteron Son T. Nguyen The deuteron is the only known bound state of two nucleons at physical quark masses. Yet, it provides an important testing ground for nuclear theory to better understand fewnucleon systems. We use a consistent effective field theory (EFT) developed in Ref. [1] to study protondeuteron and deuterondeuteron elastic scatterings in the S=2 channel at low energies below the deuteron breakup momentum (∼45.7 MeV). In this EFT, the deuteron is considered a fundamental particle. Therefore, interactions such as the Coulomb force can be treated analytically. Our study may provide valuable tests for use in the full fourbody calculations. 
Saturday, April 9, 2022 4:33PM  4:45PM 
E13.00005: Twopion exchange as a leadingorder contribution in chiral effective field theory Chinmay Mishra, Andreas Ekstrom, Gaute Hagen, Thomas Papenbrock, Lucas Platter Pion exchange is the central ingredient to nucleonnucleon interactions used in nuclear structure calculations, and one pion exchange (OPE) enters at leading order in chiral effective field theory. In the ^{2S+1}L_{J}=^{1}S_{0} partial wave, however, OPE and a contact term needed for proper renormalization fail to produce the qualitative, and quantitative, features of the scattering phase shifts. Cutoff variation also revealed a surprisingly low breakdown momentum of about 330 MeV in this partial wave. Here we show that potentials consisting of OPE, two pion exchange (TPE), and a single contact address these problems and yield accurate and renormalization group (RG) invariant phase shifts in the ^{1}S_{0} partial wave. We demonstrate that a leadingorder potential with TPE can be systematically improved by adding a contact quadratic in momenta. For momentum cutoffs below about 500 MeV, the removal of relevant physics from TPE loops needs to be compensated by additional contacts to keep RG invariance. Inclusion of the Δ isobar degree of freedom in the potential does not change the strong contributions of TPE. 
Saturday, April 9, 2022 4:45PM  4:57PM 
E13.00006: Singlenucleon spectroscopic overlaps from the ab initio symmetryadapted nocore shell model Grigor H Sargsyan, Kristina D Launey, Rachel Malecek, Scott T Marley, Tomas Dytrych, Jerry P Draayer Ab initio symmetryadapted nocore shell model (SANCSM) calculations of singlenucleon spectroscopic observables are a first step to description of lowenergy nuclear reactions and can be used as input for analyzing existing or future experimental data as well as for fitting abinitiobased optical potentials. The SANCSM utilizes emergent symmetries in nuclei to reduce the dimensionality of the model space. This, in turn, allows one to reproduce the lowenergy nuclear dynamics with only a small fraction of the model space, and hence making solutions to heavier nuclei and ultralarge model spaces feasible. This work discusses calculations of spectroscopic overlap functions, spectroscopic factors and asymptotic normalization coefficients (ANC’s) for Li isotopes. 
Saturday, April 9, 2022 4:57PM  5:09PM 
E13.00007: Pole position of the a1(1260) resonance in a threebody unitary framework Daniel Sadasivan, Andrei Alexandru, Hakan Akdag, Felipe amorim, Ruairi Brett, Chris Culver, Michael U Doring, Frank X Lee, Maxim Mai Masses, widths, and branching ratios of hadronic resonances are quantified by their pole positions and residues with respect to transition amplitudes on the Riemann sheets of the complex energy plane. We utilize a manifestly 3body unitary model to determine the pole position of the a1(1260) meson from the ALEPH experiment by allowing for πρ coupled channels in S and Dwave. We find it to be (1232+15+9 −0−11 − i266+0+15 −22−27) MeV. 
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