ORCID Profile
0000-0003-1596-9087
Current Organisation
Ohio University
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Publisher: American Physical Society (APS)
Date: 25-01-2023
Publisher: American Physical Society (APS)
Date: 25-01-2022
Publisher: Springer Science and Business Media LLC
Date: 19-11-2020
Publisher: IOP Publishing
Date: 10-08-2022
Publisher: IOP Publishing
Date: 20-09-2017
Publisher: IOP Publishing
Date: 10-03-2022
Abstract: We treat low-energy 3 He– α elastic scattering in an effective field theory (EFT) that exploits the separation of scales in this reaction. We compute the litude up to next-to-next-to-leading order, developing a hierarchy of the effective-range parameters (ERPs) that contribute at various orders. We use the resulting formalism to analyse data for recent measurements at center-of-mass energies of 0.38–3.12 MeV using the scattering of nuclei in inverse kinematics (SONIK) gas target at TRIUMF as well as older data in this energy regime. We employ a likelihood function that incorporates the theoretical uncertainty due to truncation of the EFT and use Markov chain Monte Carlo s ling to obtain the resulting posterior probability distribution. We find that the inclusion of a small amount of data on the analysing power A y is crucial to determine the sign of the p-wave splitting in such an analysis. The combination of A y and SONIK data constrains all ERPs up to O ( p 4 ) in both s- and p-waves quite well. The asymptotic normalisation coefficients and s-wave scattering length are consistent with a recent EFT analysis of the capture reaction 3 He( α , γ ) 7 Be.
Publisher: Springer Science and Business Media LLC
Date: 07-01-2017
Publisher: American Physical Society (APS)
Date: 09-08-2021
Publisher: IOP Publishing
Date: 2022
Abstract: We present the results of a National Science Foundation Project Scoping Workshop, the purpose of which was to assess the current status of calculations for the nuclear matrix elements governing neutrinoless double-beta decay and determine if more work on them is required. After reviewing important recent progress in the application of effective field theory, lattice quantum chromodynamics, and ab initio nuclear-structure theory to double-beta decay, we discuss the state of the art in nuclear-physics uncertainty quantification and then construct a roadmap for work in all these areas to fully complement the increasingly sensitive experiments in operation and under development. The roadmap includes specific projects in theoretical and computational physics as well as the use of Bayesian methods to quantify both intra- and inter-model uncertainties. The goal of this ambitious program is a set of accurate and precise matrix elements, in all nuclei of interest to experimentalists, delivered together with carefully assessed uncertainties. Such calculations will allow crisp conclusions from the observation or non-observation of neutrinoless double-beta decay, no matter what new physics is at play.
Publisher: Elsevier BV
Date: 03-2009
Publisher: American Physical Society (APS)
Date: 11-11-2020
Publisher: IOP Publishing
Date: 22-02-2019
Publisher: IOP Publishing
Date: 20-05-2021
Abstract: We describe the Bayesian analysis of nuclear dynamics (BAND) framework, a cyberinfrastructure that we are developing which will unify the treatment of nuclear models, experimental data, and associated uncertainties. We overview the statistical principles and nuclear-physics contexts underlying the BAND toolset, with an emphasis on Bayesian methodology’s ability to leverage insights from multiple models. In order to facilitate understanding of these tools, we provide a simple and accessible ex le of the BAND framework’s application. Four case studies are presented to highlight how elements of the framework will enable progress in complex, far-ranging problems in nuclear physics (NP). By collecting notation and terminology, providing illustrative ex les, and giving an overview of the associated techniques, this paper aims to open paths through which the NP and statistics communities can contribute to and build upon the BAND framework.
Publisher: Elsevier BV
Date: 02-2022
Publisher: IOP Publishing
Date: 25-11-2021
Abstract: A workshop on The Next Generation Gamma-Ray Source sponsored by the Office of Nuclear Physics at the Department of Energy, was held November 17-19, 2016 in Bethesda, Maryland. The goals of the workshop were to identify basic and applied research opportunities at the frontiers of nuclear physics that would be made possible by the beam capabilities of an advanced laser Compton beam facility. To anchor the scientific vision to realistically achievable beam specifications using proven technologies, the workshop brought together experts in the fields of electron accelerators, lasers, and optics to examine the technical options for achieving the beam specifications required by the most compelling parts of the proposed research programs. An international assembly of participants included current and prospective γ -ray beam users, accelerator and light-source physicists, and federal agency program managers. Sessions were organized to foster interactions between the beam users and facility developers, allowing for information sharing and mutual feedback between the two groups. The workshop findings and recommendations are summarized in this whitepaper.
Publisher: Elsevier BV
Date: 12-2015
Publisher: American Physical Society (APS)
Date: 11-11-2020
Publisher: Elsevier BV
Date: 10-2012
Publisher: Wiley
Date: 15-04-2021
Abstract: The problem of extrapolating the perturbation series for the dilute Fermi gas in three dimensions to the unitary limit of infinite scattering length and into the BEC region is considered, using the available strong‐coupling information to constrain the extrapolation problem. In this constrained extrapolation problem (CEP), the goal is to find classes of approximants that give well‐converged results already for low perturbative truncation orders. First, it is shown that the standard Padé and Borel methods are too restrictive to give satisfactory results for this CEP. A generalization of Borel extrapolation is given by the so‐called maximum‐entropy (MaxEnt) extrapolation method. However, it is shown that MaxEnt requires extensive elaborations to be applicable to the dilute Fermi gas and is, thus, not practical for the CEP in this case. Instead, order‐dependent‐mapping extrapolation (ODME) as a simple, practical, and general method for the CEP is proposed. It is found that the ODME approximants for the ground‐state energy of the dilute Fermi gas are robust with respect to changes of the mapping choice and agree with results from quantum Monte Carlo simulations within uncertainties.
Publisher: IOP Publishing
Date: 13-03-2020
Publisher: IOP Publishing
Date: 05-02-2015
Publisher: Springer Science and Business Media LLC
Date: 03-02-2022
Publisher: Springer Science and Business Media LLC
Date: 27-02-2021
Publisher: Springer Science and Business Media LLC
Date: 16-09-2019
Publisher: American Physical Society (APS)
Date: 14-12-2021
Publisher: American Physical Society (APS)
Date: 10-10-2019
Publisher: American Physical Society (APS)
Date: 20-10-2022
No related grants have been discovered for Daniel Phillips.