Nuclear Theory·nucl-th

Thursday·June 8, 2023

8 papers—5 primary·3 cross-listed

06
[Submitted on 7 Jun 2023] (cross-list from hep-ph)
Coupled-channel influence on the $a_{0} (1700/1800)$ line shape
N. N. Achasov🇷🇺 · G. N. Shestakov🇷🇺
The current situation with the recently discovered $a_{0} (1700/1800)$ resonance is very paradoxical: it is believed that $a_{0} (1700/1800)$ must be strongly coupled with two vector mesons, but there is no direct experimental confirmation of this yet. Based on the assumption that the $a_{0} (1700/1800)$ is a state similar to the four-quark state from the MIT bag, belonging to either the $9^{*}$ or the $36^{*}$ $q^{2} q ˉ^{2}$ multiplet, we analyze the influence of the strong $a_{0} (1700/1800)$ coupling to the vector channels $K^{*} K ˉ^{*}$ , $ρϕ$ , and $ρ ω$ on its line shape in the decay channels into pseudoscalar mesons $K K ˉ$ , $π η$ , and $π η^{'}$ . This effect depends on the location of the resonance mass $m_{a_{0}}$ relative to the nominal thresholds of vector channels. For example, if $m_{a_{0}} \approx 1700$ MeV, then the influence turns out to be hidden in a fairly wide range of coupling constants. On the whole, our analysis shows that, to confirm the presence of the strong $a_{0} (1700/1800)$ coupling to the vector channels, utterly required is the direct detection of the decays $a_{0} (1700/1800) \to K^{*} K ˉ^{*}$ , $ρϕ$ , $ρ ω$ . The appearance of even certain hints at the existence of these decays would make it possible to fundamentally advance in understanding the nature of the new $a_{0}$ state.
Comments:
11 pages, 5 figures; v2 clarifications and references added
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2306.04478 [pdf]
PRD(2023)·9 citations
07
[Submitted on 7 Jun 2023] (cross-list from nucl-ex)
Binding energies of ground and isomeric states in neutron-rich ruthenium isotopes: measurements at JYFLTRAP and comparison to theory
M. Hukkanen🇫🇮 · W. Ryssens · P. Ascher🇫🇷 · M. Bender🇫🇷 · T. Eronen🇫🇮 · S. Grévy🇫🇷 · A. Kankainen🇫🇮 · M. Stryjczyk🇫🇮 · L. Al Ayoubi🇫🇮 · S. Ayet🇩🇪 · O. Beliuskina🇫🇮 · C. Delafosse🇫🇮 and 18 other authors
We report on precision mass measurements of $^{113, 115, 117}$ Ru performed with the JYFLTRAP double Penning trap mass spectrometer at the Accelerator Laboratory of University of Jyväskylä. The phase-imaging ion-cyclotron-resonance technique was used to resolve the ground and isomeric states in $^{113, 115}$ Ru and enabled for the first time a measurement of the isomer excitation energies, $E_{x} (^{113}$ Ru $^{m}) = 100.5 (8)$ keV and $E_{x} (^{115}$ Ru $^{m}) = 129 (5)$ keV. The ground state of $^{117}$ Ru was measured using the time-of-flight ion-cyclotron-resonance technique. The new mass-excess value for $^{117}$ Ru is around 36 keV lower and 7 times more precise than the previous literature value. With the more precise ground-state mass values, the evolution of the two-neutron separation energies is further constrained and a similar trend as predicted by the BSkG1 model is obtained up to the neutron number $N = 71$ .
Comments:
12 pages, 9 figures, submitted to Physical Review C
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2306.04517 [pdf]
PRC(2023)·12 citations
08
[Submitted on 7 Jun 2023] (cross-list from astro-ph.HE)
Constraining nuclear parameters using Gravitational waves from f-mode Oscillations in Neutron Stars
Bikram Keshari Pradhan · Dhruv Pathak · Debarati Chatterjee
Gravitational waves (GW) emanating from unstable quasi-normal modes in Neutron Stars (NS) could be accessible with the improved sensitivity of the current GW detectors or with the next-generation GW detectors and, therefore, can be employed to study the NS interior. Assuming f-mode excitation in isolated pulsars with typical energy of pulsar glitches and considering potential f-mode GW candidates for A+ (upgraded LIGO detectors operating at 5th observation run design sensitivity) and Einstein Telescope (ET), we demonstrate the inverse problem of NS asteroseismology within a Bayesian formalism to constrain the nuclear parameters and NS Equation of State (EOS). We describe the NS interior within relativistic mean field formalism. Taking the example of glitching pulsars, we find that for a single event in A+ and ET, among the nuclear parameters, the nucleon effective mass ( $m^{*}$ ) within 90\% credible interval (CI) can be restricted within $10%$ and $5%$ , respectively. At the same time, the incompressibility ( $K$ ) and the slope of the symmetry energy ( $L$ ) are only loosely constrained. Considering multiple (10) events in A+ and ET, all the nuclear parameters are well constrained, especially $m^{*}$ , which can be constrained to 3\% and 2\% in A+ and ET, respectively. Uncertainty in the observables of a $1.4 M_{⊙}$ NS such as radius ( $R_{1.4 M_{⊙}}$ ), f-mode frequency ( $f_{1.4 M_{⊙}}$ ), damping time ( $τ_{1.4 M_{⊙}}$ ) and a few EOS properties including squared speed of sound ( $c_{s}^{2}$ ) are also estimated.
Comments:
Accepted for publication in the Astrophysical Journal (APJ). 17 pages and 9 figures
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
2306.04626 [pdf]
ApJ(2023)·27 citations

Affiliations

first authorsco-authorsvia INSPIRE

Coupled-channel influence on the a0​(1700/1800) line shape

Binding energies of ground and isomeric states in neutron-rich ruthenium isotopes: measurements at JYFLTRAP and comparison to theory

Constraining nuclear parameters using Gravitational waves from f-mode Oscillations in Neutron Stars

Affiliations

Coupled-channel influence on the $a_{0} (1700/1800)$ line shape