Nuclear Theory·nucl-th

Thursday·December 24, 2020

7 papers—3 primary·4 cross-listed

01
Light nuclei with semilocal momentum-space regularized chiral interactions up to third order
P. Maris🇺🇸 · E. Epelbaum🇩🇪 · R. J. Furnstahl🇺🇸 · J. Golak🇵🇱 · K. Hebeler🇩🇪 · T. Hüther🇩🇪 · H. Kamada🇯🇵 · H. Krebs🇩🇪 · Ulf-G. Meißner🇩🇪 · J. A. Melendez🇺🇸 · A. Nogga🇩🇪 · P. Reinert🇩🇪 and 8 other authors
We present a systematic investigation of few-nucleon systems and light nuclei using the current LENPIC interactions comprising semilocal momentum-space regularized two- and three-nucleon forces up to third chiral order (N $^{2}$ LO). Following our earlier study utilizing the coordinate-space regularized interactions, the two low-energy constants entering the three-body force are determined from the triton binding energy and the differential cross section minimum in elastic nucleon-deuteron scattering. Predictions are made for selected observables in elastic nucleon-deuteron scattering and in the deuteron breakup reactions, for properties of the $A = 3$ and $A = 4$ nuclei, and for spectra of $p$ -shell nuclei up to $A = 16$ . A comprehensive error analysis is performed including an estimation of correlated truncation uncertainties for nuclear spectra. The obtained predictions are generally found to agree with experimental data within errors. Similar to the coordinate-space regularized chiral interactions at the same order, a systematic overbinding of heavier nuclei is observed, which sets in for $A \sim 10$ and increases with $A$ .
nucl-thPRC(2021)·114 citations
02
Quenching of single-particle strength from direct reactions with stable and rare-isotope beams
T. Aumann🇩🇪 · C. Barbieri🇬🇧 · D. Bazin🇺🇸 · C. A. Bertulani🇺🇸 · A. Bonaccorso🇮🇹 · W. H. Dickhoff · A. Gade🇺🇸 · M. Gómez-Ramos🇩🇪 · B. P. Kay🇺🇸 · A. M. Moro🇪🇸 · T. Nakamura🇯🇵 · A. Obertelli🇩🇪 and 3 other authors
In this review article we discuss the present status of direct nuclear reactions and the nuclear structure aspects one can study with them. We discuss the spectroscopic information we can assess in experiments involving transfer reactions, heavy-ion-induced knockout reactions and quasifree scattering with (p,2p), (p,pn), and (e,e'p) reactions. In particular, we focus on the proton-to-neutron asymmetry of the quenching of the spectroscopic strength.
nucl-thnucl-exPPNP(2021)·119 citations
03
The fate of nonlinear perturbations near the QCD critical point
Golam Sarwar🇮🇳 · Md Hasanujjaman🇮🇳 · Mahfuzur Rahaman🇮🇳 · Abhijit Bhattacharyya🇮🇳 · Jan-e Alam🇮🇳
The impact of the QCD critical point on the propagation of nonlinear waves has been studied. The effects have been investigated within the scope of second-order causal dissipative hydrodynamics by incorporating the critical point into the equation of state, and the scaling behaviour of transport coefficients and of thermodynamic response functions. Near the critical point, the nonlinear waves are found to be significantly damped which may result in the disappearance of the Mach cone effects of the away side jet. Such damping may lead to enhancement in the fluctuations of elliptic and higher flow coefficients. Therefore, the disappearance of Mach cone effects and the enhancement of fluctuations in flow harmonics in the event-by-event analysis may be considered as signals of the critical endpoint.
nucl-thhep-phnucl-exPLB(2021)·6 citations
04
Confinement and Graded Partition Functions for $N = 4$ SYM
Aleksey Cherman🇺🇸 · Aditya Dhumuntarao🇺🇸
Gauge theories with confining phases at low temperatures tend to deconfine at high temperatures. In some cases, for example in supersymmetric theories, confinement can persist for all temperatures provided the partition function includes a grading by $(- 1)^{F}$ . When it is possible to define partition functions which smoothly interpolate between no grading and $(- 1)^{F}$ grading, it is natural to ask if there are other choices of grading that have the same effect as $(- 1)^{F}$ on confinement. We explore how this works for $N = 4$ SYM on $S^{1} \times S^{3}$ in the large $N$ limit at both small and large coupling. We find evidence for a continuous range of grading parameters that preserve confinement for all temperatures at large coupling, while at small coupling only a discrete set of gradings preserves confinement.
↳ hep-thnucl-thPRD(2021)·7 citations
05
Evolution of Primordial Neutrino Helicities in Astrophysical Magnetic Fields and Implications for their Detection
Gordon Baym🇺🇸 · Jen-Chieh Peng🇺🇸
Since decoupling in the early universe in helicity states, primordial neutrinos propagating in astrophysical magnetic fields precess and undergo helicity changes. In view of the XENON1T experiment possibly finding a large magnetic moment of solar neutrinos, we estimate the helicity flipping for relic neutrinos in both cosmic and galactic magnetic fields. The flipping probability is sensitive both to the neutrino magnetic moment and the structure of the magnetic fields, thus potentially a probe of the fields. As we find, even a magnetic moment well below that suggested by XENON1T could significantly affect relic neutrino helicities and their detection rate via inverse tritium beta decay.
↳ hep-phastro-ph.COhep-exnucl-thPRL(2021)·15 citations
06
The Chiral Phase Transitions of Helical Matter
Shen-Song Wan🇨🇳 · Marco Ruggieri🇨🇳
We study the thermodynamics of helical matter, namely quark matter in which a net helicity, $n_{H}$ , is in equilibrium. Interactions are modeled by the renormalized quark-meson model with two flavors of quarks. Helical density is described within the grand-canonical ensemble formalism via a chemical potential, $μ_{H}$ . We study the transitions from the normal quark matter and hadron gas to the helical matter, drawing the phase diagram at zero temperature. We study the restoration of chiral symmetry at finite temperature and show that the net helical density softens the transition, moving the critical endpoint to lower temperature and higher baryon chemical potential. Finally, we discuss briefly the effect of a rigid rotation on the helical matter, in particular on the fluctuations of $n_{H}$ , and show that these are enhanced by the rotation.
↳ hep-phhep-lathep-thnucl-thPRD(2021)·3 citations
07
Inclusive and exclusive neutrino-nucleus cross sections and the reconstruction of the interaction kinematics
Bruno Bourguille🇪🇸 · Juan Nieves🇪🇸 · Federico Sanchez🇨🇭
We present a full kinematic analysis of neutrino-nucleus charged current quasielastic interactions based on the Local Fermi Gas model and the Random PhaseApproximation. The model was implemented in the NEUT Monte Carlo framework, which allows us to investigate potentially measurable observables, including hadron distributions. We compare the predictions simultaneously to the most recent T2K and MINERvA charged current (CC) inclusive, CC0 $π$ and transverse kinematic-imbalance variable results. We pursuit a microscopic interpretation of the relevant reaction mechanisms, with the aim of achieving in neutrino oscillation experiments a correct reconstruction of the incoming neutrino kinematics, free of conceptual biasses. Such study is of the utmost importance for the ambitious experimental program which is underway to precisely determine neutrino properties, test the three-generation paradigm, establish the order of mass eigenstates and investigate leptonic CP violation.
↳ hep-phnucl-thJHEP(2021)·28 citations

Affiliations

first authorsco-authorsvia INSPIRE

Light nuclei with semilocal momentum-space regularized chiral interactions up to third order

Quenching of single-particle strength from direct reactions with stable and rare-isotope beams

The fate of nonlinear perturbations near the QCD critical point

Confinement and Graded Partition Functions for N=4 SYM

Evolution of Primordial Neutrino Helicities in Astrophysical Magnetic Fields and Implications for their Detection

The Chiral Phase Transitions of Helical Matter

Inclusive and exclusive neutrino-nucleus cross sections and the reconstruction of the interaction kinematics

Affiliations

Confinement and Graded Partition Functions for $N = 4$ SYM