Nuclear Theory·nucl-th

Friday·June 21, 2024

19 papers—9 primary·10 cross-listed

10
[Submitted on 10 Jun 2024] (cross-list from physics.ins-det)
Open-Source Optimization of Hybrid Monte-Carlo Methods for Fast Response Modeling of NaI(Tl) and HPGe Gamma Detectors
Matthew Niichel · Stylianos Chatzidakis
Modeling the response of gamma detectors has long been a challenge within the nuclear community. Significant research has been conducted to digitally replicate instruments that can cost over $100,000 and are difficult to operate outside a laboratory setting. Subsequently, there have been multiple attempts to create codes that replicate the response of sodium-iodide and high purity germanium detectors for the purpose of deriving data related to gamma ray interaction with matter. While robust programs do exist, they are often subject to export controls and/or they are not intuitive to use. Through the use of the Hybrid Monte-Carlo methods, MATLAB can be used to produce a fast first-order response of various gamma ray detectors. The combination of a graphics user interface with a numerical based script allows for an open-source and intuitive code. When benchmarked with experimental data from Co-60, Cs-137, and Na-22 the code can numerically calculate a response comparable to experimental and industry standard response codes. Through this code, it is shown that a savings in computational requirements and the inclusion of an intuitive user experience does not heavily compromise data when compared to other standard codes or experimental results. When the application is installed on a computer with 16 cores, the average time to simulate the benchmarked isotopes is 0.26 seconds and 1.63 seconds on a four-core machine. The results indicate that simple gamma detectors can be modeled in an open-source format. The anticipation for the MATLAB application is to be a tool that can be easily accessible and provide datasets for use in an academic setting requiring the gamma ray detectors. Ultimately, providing evidence that Hybrid Monte-Carlo codes in an open-source format can benefit the nuclear community.
Subjects:
Instrumentation and Detectors (physics.ins-det); Nuclear Theory (nucl-th)
arXiv:
2406.12903 [pdf]
0 citations
11
[Submitted on 19 Jun 2024] (cross-list from hep-ph)
Charm and Bottom Hadrons in Hot Hadronic Matter
Santosh K. Das🇮🇳 · Juan M. Torres-Rincon🇪🇸 · Ralf Rapp🇺🇸
Heavy quarks, and the hadrons containing them, are excellent probes of the QCD medium formed in high-energy heavy-ion collisions, as they provide essential information on the transport properties of the medium and how quarks color-neutralize into hadrons. Large theoretical and phenomenological efforts have been dedicated thus far to assess the diffusion of charm and bottom quarks in the quark-gluon plasma and their subsequent hadronization into heavy-flavor (HF) hadrons. However, the fireball formed in heavy-ion collisions also features an extended hadronic phase, and therefore any quantitative analysis of experimental observables needs to account for the rescattering of charm and bottom hadrons. This is further reinforced by the presence of a QCD cross-over transition and the notion that the interaction strength is maximal in the vicinity of the pseudo-critical temperature. We review existing approaches for evaluating the interactions of open HF hadrons in a hadronic heat bath and the pertinent results for scattering amplitudes, spectral functions and transport coefficients. While most of the work to date has focused on $D$ -mesons, we also discuss excited states as well as HF baryons and the bottom sector. Both the HF hadro-chemistry and bottom observables will play a key role in future experimental measurements. We also conduct a survey of transport calculations in heavy-ion collisions that have included effects of hadronic HF diffusion and assess its impact on various observables.
Comments:
65 pages, 45 figures. v2: Corrected and improved version with added explanations and references. Version accepted and published in Physics Reports journal
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2406.13286 [pdf]
Phys.Rept.(2025)·32 citations
12
[Submitted on 19 Jun 2024] (cross-list from hep-ph)
Resonances in the quark model
Jean-Marc Richard🇫🇷 · Alfredo Valcarce🇪🇸 · Javier Vijande🇪🇸
A discussion is presented of the estimates of the energy and width of resonances in constituent models, with focus on the tetraquark states containing heavy quarks.
Comments:
17 pages, To appear in Few-Body Systems, special issue on Critical Stability
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2406.13530 [pdf]
Few Body Syst.(2024)·2 citations
13
[Submitted on 19 Jun 2024] (cross-list from hep-ph)
LQCD constrained magnetic field dependent coupling constant in an effective model
Shijun Mao🇨🇳
A magnetic field dependent coupling constant $G (e B)$ is investigated in the two-flavor magnetized NJL model. Based on LQCD results of the neutral (charged) pion mass spectra at vanishing temperature and finite magnetic field, we determine the $G (e B) = G^{0} (e B)$ ( $G (e B) = G^{+} (e B)$ ) in the NJL model. $G^{0} (e B)$ and $G^{+} (e B)$ are both non-monotonic functions of magnetic fields, but they are different from each other. Furthermore, we calculate the pseudo-critical temperatures $T_{p c} (e B)$ of chiral restoration phase transition with $G^{0} (e B)$ and $G^{+} (e B)$ in the magnetized NJL model, respectively. The resulting $T_{p c} (e B)$ are non-monotonic functions of magnetic fields. In previous work, $G (e B)$ in the NJL model fitted from the chiral condensate or pseudo-critical temperature of LQCD simulations is a decreasing function of magnetic field. It can not explain the saturation behavior of mass spectra of neutral pion and decreasing behavior of mass spectra of charged pion with strong magnetic field. We conclude that a magnetic field dependent coupling constant $G (e B)$ in the NJL model can not simultaneously explain the reduction of pseudo-critical temperature of chiral restoration phase transition and the light meson mass spectra under external magnetic field.
Comments:
8 pages, 4 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2406.13531 [pdf]
0 citations
14
[Submitted on 19 Jun 2024] (cross-list from hep-ph)
Working group 1 summary: $V_{u d}$ , $V_{u s}$ , $V_{c d}$ , $V_{cs}$ and semileptonic/leptonic $D$ decays
Bipasha Chakraborty🇬🇧 · Alex Gilman🇬🇧 · Martin Hoferichter🇨🇭 · Michal Koval🇨🇿
We summarize the program of working group 1 at the 12th Workshop on the CKM Unitarity Triangle, whose main subjects covered $V_{u d}$ , $V_{u s}$ , and first-row unitarity as well as $V_{c d}$ , $V_{cs}$ , and (semi-)leptonic $D$ decays.
Comments:
12 pages, 3 figures; presented at the 12th Workshop on the CKM Unitarity Triangle, 18-22 September 2023, Santiago de Compostela
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2406.13703 [pdf]
1 citation
15
[Submitted on 19 Jun 2024] (cross-list from hep-ph)
Effective theory tower for $μ \to e$ conversion
Wick Haxton🇺🇸 · Kenneth McElvain🇺🇸 · Tony Menzo🇺🇸 · Evan Rule🇺🇸 · Jure Zupan🇺🇸
We present theoretical predictions for $μ \to e$ conversion rates using a tower of effective field theories connecting the UV to nuclear physics scales. The interactions in nuclei are described using a recently developed nonrelativistic effective theory (NRET) that organizes contributions according to bound nucleon and muon velocities, $v_{N}$ and $v_{μ}$ , with $∣ v_{N} ∣ > ∣ v_{μ} ∣$ . To facilitate the top-down matching, we enlarge the set of Lorentz covariant nucleon-level interactions mapped onto the NRET operators to include those mediated by tensor interactions, in addition to the scalar and vector interactions already considered previously, and then match NRET nonperturbatively onto the Weak Effective Theory (WET). At the scale $μ \approx 2$ GeV WET is formulated in terms of $u$ , $d$ , $s$ quarks, gluons and photons as the light degrees of freedom, along with the flavor-violating leptonic current. We retain contributions from WET operators up to dimension 7, which requires the full set of 26 NRET operators. The results are encoded in the open-source Python- and Mathematica-based software suite MuonBridge, which we make available to the theoretical and experimental communities interested in $μ \to e$ conversion.
Comments:
60 pages, 7 figures, 7 tables. V2 typos fixed, matches JHEP version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2406.13818 [pdf]
JHEP(2024)·35 citations
16
[Submitted on 20 Jun 2024] (cross-list from cond-mat.quant-gas)
Quantum vortices in fermionic superfluids: from ultracold atoms to neutron stars
Piotr Magierski · Andrea Barresi · Andrzej Makowski · Daniel Pęcak · Gabriel Wlazłowski
Superfluid dilute neutron matter and ultracold gas, close to the unitary regime, exhibit several similarities. Therefore, to a certain extent, fermionic ultracold gases may serve as emulators of dilute neutron matter, which forms the inner crust of neutron stars and is not directly accessed experimentally. Quantum vortices are one of the most significant properties of neutron superfluid, essential for comprehending neutron stars' dynamics. The structure and dynamics of quantum vortices as a function of pairing correlations' strength are being investigated experimentally and theoretically in ultracold gases. Certain aspects of these studies are relevant to neutron stars. We provide an overview of the characteristics of quantum vortices in s-wave-type fermionic and electrically neutral superfluids. The main focus is on the dynamics of fermionic vortices and their intrinsic structure.
Subjects:
Quantum Gases (cond-mat.quant-gas); High Energy Astrophysical Phenomena (astro-ph.HE); Superconductivity (cond-mat.supr-con); Nuclear Theory (nucl-th)
arXiv:
2406.14158 [pdf]
EPJA(2024)·7 citations
17
[Submitted on 20 Jun 2024] (cross-list from hep-ph)
Dynamics of Phase Transition in Quark-Gluon Plasma Droplet Formation under Magnetic Field
Agam K. Jha🇮🇳 · Aviral Srivastava🇮🇳
Pre-existing density of states for a Quark-Gluon Phase, based on Thomas-Fermi and Bethe mode, is expanded by incorporation of new variables. Results from recent study indicate that perturbations in the form of a finite non-zero chemical potential T, B, dynamic thermal masses M and of course Temperature T are indeed vital to fully comprehend the formation and dynamics of QGP. Simulations depict an overall increase in the stability of QGP in the paradigm of the statistical model. On the top of Free Energy, Entropy and heat capacity are calculated for the phase transition. The overall qualitative behavior, of entropy or Heat Capacity determines the order of phase transition of the QGP. Investigation of order of phase transition is carried out in this study through Monte-Carlo based differential element, which ensures the inclusion of the randomness of the collisions at the particle colliders.
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2406.14172 [pdf]
Int.J.Mod.Phys.A(2025)·1 citation
18
[Submitted on 20 Jun 2024] (cross-list from astro-ph.HE)
The Radius of the High-mass Pulsar PSR J0740+6620 with 3.6 yr of NICER Data
Tuomo Salmi🇳🇱 · Devarshi Choudhury🇳🇱 · Yves Kini🇳🇱 · Thomas E. Riley🇳🇱 · Serena Vinciguerra🇳🇱 · Anna L. Watts🇳🇱 · Michael T. Wolff🇺🇸 · Zaven Arzoumanian🇺🇸 · Slavko Bogdanov🇺🇸 · Deepto Chakrabarty🇺🇸 · Keith Gendreau🇺🇸 · Sebastien Guillot🇫🇷 and 5 other authors
We report an updated analysis of the radius, mass, and heated surface regions of the massive pulsar PSR J0740+6620 using Neutron Star Interior Composition Explorer (NICER) data from 2018 September 21 to 2022 April 21, a substantial increase in data set size compared to previous analyses. Using a tight mass prior from radio timing measurements and jointly modeling the new NICER data with XMM-Newton data, the inferred equatorial radius and gravitational mass are $12.4 9_{- 0.88}^{+ 1.28}$ km and $2.07 3_{- 0.069}^{+ 0.069}$ $M_{⊙}$ respectively, each reported as the posterior credible interval bounded by the $16 %$ and $84 %$ quantiles, with an estimated systematic error $≲ 0.1$ km. This result was obtained using the best computationally feasible sampler settings providing a strong radius lower limit but a slightly more uncertain radius upper limit. The inferred radius interval is also close to the $R = 12.7 6_{- 1.02}^{+ 1.49}$ km obtained by Dittmann et al., when they require the radius to be less than $16$ km as we do. The results continue to disfavor very soft equations of state for dense matter, with $R < 11.15$ km for this high-mass pulsar excluded at the $95 %$ probability. The results do not depend significantly on the assumed cross-calibration uncertainty between NICER and XMM-Newton. Using simulated data that resemble the actual observations, we also show that our pipeline is capable of recovering parameters for the inferred models reported in this paper.
Comments:
17 pages, 9 figures (2 of which are figure sets), 2 tables, published in ApJ
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2406.14466 [pdf]
ApJ(2024)·252 citations
19
[Submitted on 20 Jun 2024] (cross-list from astro-ph.HE)
A More Precise Measurement of the Radius of PSR J0740+6620 Using Updated NICER Data
Alexander J. Dittmann🇺🇸 · M. Coleman Miller🇺🇸 · Frederick K. Lamb🇺🇸 · Isiah Holt🇺🇸 · Cecilia Chirenti🇺🇸 · Michael T. Wolff🇺🇸 · Slavko Bogdanov🇺🇸 · Sebastien Guillot🇫🇷 · Wynn C. G. Ho🇺🇸 · Sharon M. Morsink🇨🇦 · Zaven Arzoumanian🇺🇸 · Keith C. Gendreau🇺🇸
PSR J0740+6620 is the neutron star with the highest precisely determined mass, inferred from radio observations to be $2.08 \pm 0.07 M_{⊙}$ . Measurements of its radius therefore hold promise to constrain the properties of the cold, catalyzed, high-density matter in neutron star cores. Previously, Miller et al. (2021) and Riley et al. (2021) reported measurements of the radius of PSR J0740+6620 based on Neutron Star Interior Composition Explorer (NICER) observations accumulated through 17 April 2020, and an exploratory analysis utilizing NICER background estimates and a data set accumulated through 28 December 2021 was presented in Salmi et al. (2022). Here we report an updated radius measurement, derived by fitting models of X-ray emission from the neutron star surface to NICER data accumulated through 21 April 2022, totaling $\sim 1.1$ Ms additional exposure compared to the data set analyzed in Miller et al. (2021) and Riley et al. (2021), and to data from X-ray Multi-Mirror (XMM-Newton) observations. We find that the equatorial circumferential radius of PSR J0740+6620 is $12.9 2_{- 1.13}^{+ 2.09}$ km (68% credibility), a fractional uncertainty $\sim 83%$ the width of that reported in Miller et al. (2021), in line with statistical expectations given the additional data. If we were to require the radius to be less than 16 km, as was done in Salmi et al. (2024), then our 68% credible region would become $R = 12.7 6_{- 1.02}^{+ 1.49}$ km, which is close to the headline result of Salmi et al. (2024). Our updated measurements, along with other laboratory and astrophysical constraints, imply a slightly softer equation of state than that inferred from our previous measurements.
Comments:
18 pages, 8 figures, +appendices. Accepted in ApJ
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2406.14467 [pdf]
ApJ(2024)·178 citations

Affiliations

first authorsco-authorsvia INSPIRE