Nuclear Theory·nucl-th

Tuesday·January 7, 2025

16 papers—12 primary·4 cross-listed

13
[Submitted on 3 Jan 2025] (cross-list from hep-th)
Symmetry and causality constraints on Fermi liquids
Luca V. Delacrétaz🇺🇸 · Subham Dutta Chowdhury🇺🇸 · Umang Mehta🇺🇸
We investigate symmetry and causality constraints on interacting Fermi liquids. Whereas Galilean or Lorentz boost symmetry leads to a well-known constraint on the first Landau parameter $F_{1}$ , we show that scale invariance similarly constrains $F_{0}$ . In the case of conformal Fermi liquids, we show that causality constraints on the particle-hole continuum and on zero sound strongly restrict the available parameter space for interacting Fermi liquids. We also consider nonlinear response, which we show is sensitive to additional ``generalized Landau parameters'' even at lowest orders in the long wavelength limit. We impose Galilean, Lorentz and scale symmetry on these generalized Landau parameters, obtaining further nonlinear constraints. We test our constraints in several microscopic models that enter a Fermi liquid phase.
Comments:
JHEP version, Appendices added, Detailed discussion on Schrodinger invariance in Fermi liquids
Subjects:
High Energy Physics — Theory (hep-th); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th)
arXiv:
2501.02073 [pdf]
JHEP(2025)·11 citations
14
[Submitted on 6 Jan 2025] (cross-list from hep-ph)
Valence quark-stopping and gluon junction-stopping scenarios in electron-nucleus collisions at the forthcoming Electron-Ion Collider: Which one is correct?
Ting-Ting Duan🇨🇳 · Fu-Hu Liu🇨🇳 · Khusniddin K. Olimov🇺🇿
In the current literature, two stopping scenarios are being discussed in the context of high-energy collisions: the valence quark scenario and the gluon or baryon junction scenario. In the valence quark-stopping scenario, three valence quarks each contribute one-third of the baryon number within a baryon. Conversely, in the gluon junction-stopping scenario, the gluon junction is responsible for carrying the entire baryon number. At present, there is no consensus regarding which type of stopping scenario is correct. Based on a multi-source thermal model, our investigation indicates that the experimental data analyzed in both previous and present studies suggest that the valence quark-stopping scenario is more suitable for semi-quantitative discussions in high-energy collisions. It is anticipated that this scenario can be further validated through electron-nucleus ( $e A$ ) collisions at the forthcoming Electron-Ion Collider (EIC).
Comments:
19 pages, 9 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2501.02819 [pdf]
0 citations
15
[Submitted on 6 Jan 2025] (cross-list from nucl-ex)
Direct observation of $β$ and $γ$ decay from a high-spin long-lived isomer in $^{187}$ Ta
J. L. Chen · H. Watanabe · P. M. Walker · Y. Hirayama · Y. X. Watanabe · M. Mukai · C. F. Jiao · M. Ahmed · M. Brunet · T. Hashimoto · S. Ishizawa · F. G. Kondev and 11 other authors
$^{187}$ Ta ( $Z = 73$ , $N = 114$ ) is located in the neutron-rich $A \approx 190$ region where a prolate-to-oblate shape transition via triaxial softness is predicted to take place. A preceding work on the $K^{π} = (25/ 2^{-})$ isomer and a rotational band to which the isomer decays carried out by the same collaboration revealed that axial symmetry is slightly violated in this nucleus. This paper focuses on a higher-lying isomer, which was previously identified at 2933(14) keV by mass measurements with the Experimental Storage Ring at GSI. The isomer of interest has been populated by a multi-nucleon transfer reaction with a $^{136}$ Xe primary beam incident on a natural tungsten target, using the KEK Isotope Separation System at RIKEN. New experimental findings obtained in the present paper include the internal and external $β$ -decay branches from the high-spin isomer and a revised half-life of 136(24) s. The evaluated hindrances for $K$ -forbidden transitions put constraints on the spin-parity assignment, which can be interpreted as being ascribed to a prolate shape with a five-quasiparticle configuration by model calculations.
Comments:
9 pages, 5 figures
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2501.02848 [pdf]
PRC(2025)·2 citations
16
[Submitted on 6 Jan 2025] (cross-list from hep-ph)
Chiral dynamics: Quo vadis?
Ulf-G. Meißner🇩🇪
I review the status of chiral dynamics. Topics include pion-pion scattering, dynamically generated states in the hadron spectrum and the emergence of two-pole structures, chiral symmetry in nuclear physics and chiral dynamics in the Big Bang.
Comments:
14 pages, 4 figures, Special Plenary Session talk at Chiral Dynamics 2024
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2501.03014 [pdf]
PoS(2026)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE

Symmetry and causality constraints on Fermi liquids

Valence quark-stopping and gluon junction-stopping scenarios in electron-nucleus collisions at the forthcoming Electron-Ion Collider: Which one is correct?

Direct observation of β and γ decay from a high-spin long-lived isomer in 187Ta

Chiral dynamics: Quo vadis?

Affiliations

Direct observation of $β$ and $γ$ decay from a high-spin long-lived isomer in $^{187}$ Ta