Effects of Three-Nucleon Forces and Two-Body Currents on Gamow-Teller Strengths

Ekström, Andreas; Jansen, G. R.; Wendt, Kyle; Hagen, G.; Papenbrock, T.; Bacca, Sonia; Carlsson, Boris; Gazit, Doron

doi:10.1103/physrevlett.113.262504

Cited by 72 publications

(113 citation statements)

References 60 publications

(97 reference statements)

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“…To compute excited states in, and around, nuclei with closed shells, we employ equation-of-motion coupledcluster methods [80,[85][86][87][88][89]; these are accurate for excited states that are generalized particle-hole excitations of low rank. For instance, 14 N is computed with the chargesymmetry breaking equation-of-motion method from the closed sub-shell nucleus 14 C, see Ekström et al [89].…”

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confidence: 99%

Accurate nuclear radii and binding energies from a chiral interaction

Ekström¹,

Jansen²,

Wendt³

et al. 2015

Phys. Rev. C

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With the goal of developing predictive ab-initio capability for light and medium-mass nuclei, twonucleon and three-nucleon forces from chiral effective field theory are optimized simultaneously to low-energy nucleon-nucleon scattering data, as well as binding energies and radii of few-nucleon systems and selected isotopes of carbon and oxygen. Coupled-cluster calculations based on this interaction, named NNLOsat, yield accurate binding energies and radii of nuclei up to 40 Ca, and are consistent with the empirical saturation point of symmetric nuclear matter. In addition, the low-lying collective J π = 3 − states in 16 O and 40 Ca are described accurately, while spectra for selected p-and sd-shell nuclei are in reasonable agreement with experiment. Introduction -Interactions from chiral effective field theory (EFT) [1][2][3][4] and modern applications of renormalization group techniques [5][6][7][8] have opened the door for a description of atomic nuclei consistent with the underlying symmetries of quantum chromodynamics, the theory of the strong interaction. Chiral nuclear forces can be constructed systematically from long-range pion physics augmented by contact interactions. Over the past decade, the renaissance of nuclear theory based on realistic nuclear forces and powerful computational methods has pushed the frontier of ab initio calculations from fewbody systems and light nuclei [6, 9, 10] to medium-mass nuclei [11][12][13][14][15][16][17][18][19].

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confidence: 99%

Accurate nuclear radii and binding energies from a chiral interaction

Ekström¹,

Jansen²,

Wendt³

et al. 2015

Phys. Rev. C

Self Cite

460

598

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“…[9] with a cutoff Λ χ = 500 MeV. This interaction has been optimized to scattering data of the nucleonnucleon system and deuteron bound-state properties.…”

Section: Extrapolations and The Coupled-cluster Methodsmentioning

confidence: 99%

Infrared extrapolations for atomic nuclei

Furnstahl

Hagen

Papenbrock

et al. 2015

J. Phys. G: Nucl. Part. Phys.

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Abstract. Harmonic oscillator model-space truncations introduce systematic errors to the calculation of binding energies and other observables. We identify the relevant infrared scaling variable and give values for this nucleus-dependent quantity. We consider isotopes of oxygen computed with the coupled-cluster method from chiral nucleon-nucleon interactions at next-to-next-to-leading order and show that the infrared component of the error is sufficiently understood to permit controlled extrapolations. By employing oscillator spaces with relatively large frequencies, well above the energy minimum, the ultraviolet corrections can be suppressed while infrared extrapolations over tens of MeVs are accurate for ground-state energies. However, robust uncertainty quantification for extrapolated quantities that fully accounts for systematic errors is not yet developed.

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“…We have normalized the rate to the conventionally used factor G 01 that contains quantities associated with the SM weak interaction (such as g A ), even though the LNV mechanism here involves no SM gauge bosons. The rate (8) is, in fact, insensitive to g A and the debate over its "quenching" in nuclei [56][57][58][59][60][61][62].…”

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confidence: 99%

TeV lepton number violation: From neutrinoless double-βdecay to the LHC

2016

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We analyze the sensitivity of next-generation tonne-scale neutrinoless double-β decay (0νββ) experiments and searches for same-sign di-electrons plus jets at the Large Hadron Collider to TeV scale lepton number violating interactions. Taking into account previously unaccounted for physics and detector backgrounds at the LHC, renormalization group evolution, and long-range contributions to 0νββ nuclear matrix elements, we find that the reach of tonne-scale 0νββ generally exceeds that of the LHC for a class of simplified models. However, for a range of heavy particle masses near the TeV scale, the high luminosity LHC and tonne-scale 0νββ may provide complementary probes. DOI: 10.1103/PhysRevD.93.093002 Total lepton number (L) is a conserved quantum number at the classical level in the Standard Model (SM) of particle physics, yet it is not conserved in many scenarios for physics beyond the Standard Model (BSM). Experimentally, the observation of neutrinoless double-beta decay (0νββ decay) of atomic nuclei would provide direct evidence for lepton number violation (LNV 25 years. When interpreted in terms of the exchange of light Majorana neutrinos, these limits imply an upper bound of order 100-400 meV on the 0νββ-decay effective mass m ββ , depending on the value of the nuclear matrix element employed in this extraction [11]. The next generation of "tonne scale" 0νββ-decay searches aim for half-life sensitivities of order ∼10 27 years, with a corresponding m ββ sensitivity on the order of tens of meV, consistent with expectations based on the inverted hierarchy (IH) for the light neutrino mass spectrum. In this interpretive framework, a null result would imply that either neutrinos are Majorana particles with a mass spectrum in the normal hierarchy (NH) or that they are Dirac fermions.It is possible that neutrino oscillation studies may determine the neutrino mass hierarchy before the next generation 0νββ-decay searches reach their goal sensitivity. Should the hierarchy turn out to be normal, a null result from the tonne-scale 0νββ-decay experiments would not be surprising. However, alternate decay mechanisms could still lead to observation of a signal in the next generation searches, even if the light neutrino spectrum follows the NH and the value of m ββ is experimentally inaccessible. These mechanisms include radiative neutrino mass scenarios [12] and the TeV-scale seesaw mechanism [13][14][15][16][17][18][19] [20]. In these scenarios, the LNV interactions may involve particles whose masses are of order one TeV and whose exchange generates short range interactions that lead to 0νββ decay. Straightforward arguments indicate that the resulting 0νββ-decay half-life can be of order 10 27 yr or shorter, comparable to expectations based on the three light Majorana exchange mechanism and the IH [21]. The associated light Majorana masses may nevertheless follow the NH with m ββ well below the meV scale.How might one experimentally distinguish the TeV LNV scenario for 0νββ decay from the more conventional paradigm base...

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Effects of Three-Nucleon Forces and Two-Body Currents on Gamow-Teller Strengths

Cited by 72 publications

References 60 publications

Accurate nuclear radii and binding energies from a chiral interaction

Accurate nuclear radii and binding energies from a chiral interaction

Infrared extrapolations for atomic nuclei

TeV lepton number violation: From neutrinoless double-βdecay to the LHC

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