Article
Physics, Nuclear
M. Konieczka, P. Baczyk, W. Satula
Summary: This study investigates the impact of short-range isospin-symmetry-breaking terms on isospin impurities and corrections to Fermi decays in T = 1/2 mirrors, and successfully extracts the Vud matrix element using a multireference density functional theory approach. The results show that the short-range isovector interaction strongly influences the isospin impurities and corrections, and the matrix element can be accurately determined using the density functional theory approach with configuration mixing.
Article
Physics, Nuclear
Zhen-Hua Zhang
Summary: The influence of the isospin-breaking pi(0)-eta-eta' mixing effect on the CP-asymmetries of B -> K pi processes is examined for the first time. Significant uncertainty is found due to this effect on both the CP-asymmetry sum rule of B -> K pi processes and the CP-asymmetry difference of B+ -> K+pi(0) and B-0 -> K+pi(-), potentially obscuring the significance of the K pi-puzzle. A definitive conclusion is currently unavailable due to the strong non-perturbative phases upon which the correction depends.
Article
Physics, Nuclear
L. Xayavong, N. A. Smirnova
Summary: This study reexamines the radial overlap correction delta(RO) for 30 superallowed 0(+) -> 0(+) nuclear beta decays using the shell model with Hartree-Fock radial wave functions. The results show that the charge-independence-breaking term has no significant impact on delta(RO), while the charge-symmetry-breaking and gradient density terms increase delta(RO) systematically.
Article
Physics, Nuclear
M. Schafer, N. Barnea, A. Gal
Summary: The study analyzes the large charge symmetry breaking (CSB) in the mirror hypernuclei and deduces an in-medium admixture amplitude A(I=1) asymptotic to 1.5% in the dominantly isospin I = 0 lambda hyperon. The research confirms previous findings regarding the lambda-sigma(0) induced in-medium admixture amplitude and explores the impact of SU(3) flavor symmetry on the lambda-nucleon interaction, highlighting the expected influences on the S = 1 and S = 0 spin channels.
Article
Physics, Multidisciplinary
Vincenzo Cirigliano, Jordy De Vries, Leendert Hayen, Emanuele Mereghetti, Andre Walker-Loud
Summary: We compute electromagnetic corrections to neutron beta decay using a low-energy hadronic effective field theory and identify new radiative corrections arising from virtual pions that were missed in previous studies. These corrections impact the axial charge of nucleon, beta-u angular correlations, and beta asymmetry.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Nuclear
Adam Falkowski, Martin Gonzalez-Alonso, Oscar Naviliat-Cuncic, Nathal Severijns
Summary: This paper reviews the role of superallowed transitions in determining the strength of weak interaction among the lightest quarks and in searching for new physics beyond the standard electroweak model. It also discusses the effects of nucleus-dependent radiative correction and nucleus-independent inner radiative correction. Though there has been significant progress in the study of mirror transitions, the data is still limited by experimental uncertainties.
EUROPEAN PHYSICAL JOURNAL A
(2023)
Article
Multidisciplinary Sciences
Xinxing Xu
Summary: Isospin symmetry is an important concept in nuclear and elementary particle physics. Experimental beta-decay studies of nuclei with exchanged neutron and proton numbers, known as mirror nuclei, can be used to probe isospin symmetry breaking. Combined with large-scale shell-model calculations, these experiments allow for detailed investigations on mirror nuclei systems, leading to a systematic study of isospin symmetry breaking in the sd-shell nuclear region.
CHINESE SCIENCE BULLETIN-CHINESE
(2021)
Article
Physics, Nuclear
Tomoya Naito, Gianluca Colo, Haozhao Liang, Xavier Roca-Maza, Hiroyuki Sagawa
Summary: The effects of Coulomb interaction and isospin symmetry breaking on properties of atomic nuclei are discussed. It is found that corrections to the Coulomb interaction negligibly affect the neutron-skin thickness, while the charge-symmetry breaking term originating from the strong interaction might have a significant impact.
Article
Physics, Nuclear
Ya-Fei Guo, Gao-Chan Yong
Summary: A concept of isospin blocking is raised in the process of isospin diffusion in heavy-ion collisions. The study shows that isospin diffusion could be blocked if the local symmetry energy is large.
Article
Multidisciplinary Sciences
Giovanni Selva, Xavier Roca-Maza, Gianluca Colo
Summary: Isospin symmetry breaking effects on the mass-radius relation of a cold, non-accreting neutron star are studied using two Skyrme Energy Density Functionals (EDFs). The choice of functional has a significant impact on the mass-radius relation and tidal deformability of a neutron star. Further investigations are needed to clarify the effects of isospin symmetry breaking on observables of neutron stars.
Article
Physics, Nuclear
Y. Q. He, J. K. Ge, G. J. Fu, H. Jiang
Summary: This study focuses on the symmetry energy and the Wigner energy in the binding energy formula for atomic nuclei, using the double difference of experimental symmetry-Wigner energies to extract the I-2 symmetry energy and Wigner energy coefficients. The results suggest that the macroscopic isospin dependence of binding energies is well explained by the symmetry energy and the I(2) Wigner energy coefficients, with further consideration of the I-4 term not substantially improving the calculation result.
Article
Physics, Nuclear
H. H. Li, Q. Yuan, J. G. Li, M. R. Xie, S. Zhang, Y. H. Zhang, X. X. Xu, N. Michel, F. R. Xu, W. Zuo
Summary: Isospin-symmetry breaking affects the energy difference of excited states in mirror nuclei and the coefficient of the isobaric multiplet mass equation. This study extensively investigates isospin-symmetry breaking in medium-mass nuclei using ab initio frameworks. The mirror energies of sd- and pf-shell nuclei are computed, and the effects of single-particle states on weakly bound and unbound nuclear states, especially s-wave states, are discussed. Predictions are made for proton drip-line nuclei with large mirror energy difference. Lastly, the coefficient of the isobaric multiplet mass equation is calculated for T = 1/2 and T = 1 isospin multiplets from A = 18 to A = 76.
Article
Physics, Particles & Fields
Peter Boyle, Matteo Di Carlo, Felix Erben, Vera Guelpers, Maxwell T. Hansen, Tim Harris, Nils Hermansson-Truedsson, Raoul Hodgson, Andreas Juttner, Fionn O. Hogain, Antonin Portelli, James Richings, Andrew Zhen Ning Yong
Summary: In this study, the researchers performed the first RBC/UKQCD lattice calculation for isospin-breaking corrections in weak processes. It was found that, if the finite-volume systematics can be reduced, the error from isospin-breaking corrections may be sub-dominant in the final precision of the ratio of CKM matrix elements.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Nuclear
Yi-Jun Yan, Xin-Le Shang, Jian-Min Dong, Wei Zuo
Summary: The study shows that in asymmetric nuclear matter, neutron-proton pairing must be stronger than neutron-neutron and proton-proton pairings to coexist, and the presence of neutron-neutron and proton-proton pairs can enhance neutron-proton pairings. However, neutron-proton pairings are reduced when their strength approaches neutron-neutron and proton-proton pairings.
Article
Astronomy & Astrophysics
L. Jokiniemi, B. Romeo, C. Brase, J. Kotila, P. Soriano, A. Schwenk, J. Menendez
Summary: We calculate the nuclear matrix element for the two-neutrino beta beta decay of Xe-136 into the first excited 0(+) state of Ba-136 using different many-body methods. Theoretical predictions from the quasiparticle random-phase approximation (QRPA), nuclear shell model, interacting boson model (IBM-2), and effective field theory (EFT) show varying decay rates and half-lives. Cancellations between contributions of intermediate states explain the discrepancies in the predictions.