Nuclear spin dependence of time reversal invariance violating effects in neutron scattering

Gudkov, Vladimir; Shimizu, Hirohiko M.

doi:10.1103/physrevc.97.065502

Cited by 14 publications

(10 citation statements)

References 16 publications

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“…Using the bound in Eq. (38), and assuming κ ≈ 1 in Eq (4) (which is reasonable [55] and matches experimental results [15,26]), we arrive at ∆σ P T ∆σ P < ∼ 2 × 10 −5 .…”

Section: Discussionsupporting

confidence: 88%

Time-reversal invariance violation in neutron-nucleus scattering

Fadeev

Flambaum

2019

Phys. Rev. C

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Parity (P) and time-reversal (T) violating effects are enhanced a million times in neutron reactions near p-wave nuclear compound resonances. Planning and interpretation of corresponding experiments require values of the matrix elements of the T,P-violating nuclear forces between nuclear compound states. We calculate the root-mean-square values and the ratio of the matrix elements of the T,P-violating and P-violating interactions using statistical theory based on the properties of chaotic compound states. We present the results in terms of the fundamental parameters in five different forms: in terms of the constants of the contact nuclear interaction, meson exchange constants, QCD θ-term, quark chromo-electric dipole momentsdu andd d , and axion interaction constants. Using current limits on these parameters, we obtain upper bounds on the ratio of the matrix elements and on the ratio of T,P-violating and P-violating parts of the neutron reaction cross sections. Our results confirm that the expected sensitivity in neutron-reactions experiments may be sufficient to improve the limits on the T,P-violating interactions.1 We omit the numerical coefficient which depends on the specific process induced by the neutron capture.arXiv:1903.08937v2 [nucl-th]

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“…Using the bound in Eq. (38), and assuming κ ≈ 1 in Eq (4) (which is reasonable [55] and matches experimental results [15,26]), we arrive at ∆σ P T ∆σ P < ∼ 2 × 10 −5 .…”

Section: Discussionsupporting

confidence: 88%

Time-reversal invariance violation in neutron-nucleus scattering

Fadeev

Flambaum

2019

Phys. Rev. C

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“…Our results for the factors κ(I ±1/2) seem to be in agreement with the values calculated by in Ref. [79], however their calculations do not include the sign factors η s , η j from the amplitudes M s = Γ n s η s and M p,j = Γ n p,j η j (their results are expressed in terms of Γ n s and Γ n p,j…”

Section: Forward Scattering Amplitude With Time Reversal Invariance A...supporting

confidence: 91%

“…However, for comparison with Ref. [79] it is instructive to present the ratio of the two scattering amplitudes f t.p.v (20) and f p.v (18) taking into account only one s-wave resonance:…”

Section: Forward Scattering Amplitude With Time Reversal Invariance A...mentioning

confidence: 99%

Parity and Time Reversal Invariance Violation in Neutron-Nucleus Scattering

Flambaum,

Mansour

2021

Preprint

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Parity violating (PV) as well as parity and time-reversal invariance violating (PTRIV) effects are enhanced a million times in neutron reactions near p-wave compound resonances. We present the calculation of such effects using a statistical theory based on the properties of chaotic eigenstates and discuss a possibility to extract the strength constants of PTRIV interactions from the experimental data, including nucleon-nucleon and pion-nucleon CP-violating interactions, the QCD θ-term and the quark chromo-EDM. PV effects have random sign for all target nuclei except for 232 Th, where PV effects of a positive sign have been observed for ten statistically significant p-wave resonances, with energy smaller than 250 eV. This may be an indication of a possible regular (non-chaotic) contribution to PV effects. We link this regular effect to the doublets of opposite parity states in the rotation spectra of nuclei with an octupole deformation and suggest other target nuclei where this hypothesis may be tested. We also discuss a permanent sign contribution produced by doorway states. An estimate of the ratio of PTRIV effects to PV effects is presented. Although a polarised target is not needed for the measurement of PV effects, for the interpretation of the results, it may be convenient to do both PV and PTRIV experiments with a polarised target.

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“…Even if the sensitivity of the spin-rotation on TRV is far away from the present sensitivity of the EDM, this observable addresses the same physics of the EDM, posing, for the future, as a complementary and independent test for TRV in nuclei. Also other TRV observables in proton-and neutron-nucleus scattering have been proposed as probes of TRV effects [21][22][23][24][25]. The use of light nuclei to study TRV results to be advantageous because the nuclear physics of the systems is theoretically under control and so the TRV effects can be easily highlighted.…”

Section: Introductionmentioning

confidence: 99%

Time-reversal violation in light nuclei

Gnech

Viviani

2020

Phys. Rev. C

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Time Reversal Violation (TRV) interactions between quarks which appear in Standard Model(SM) and beyond-SM theories can induce TRV components in the nucleon-nucleon potential. The effects of these components can be studied by measuring the electric dipole moment (EDM) of light nuclei. In this work we present a complete derivation of the TRV nucleon-nucleon and threenucleon potential up to next-to-next-to leading order (N2LO) in a chiral effective field theory (χEFT) framework. The TRV interaction is then used to evaluate the EDM of 2 H, 3 H and 3 He focusing in particular on the effects of the TRV three-body force and on the calculation of the theoretical errors. In case of a measurement of the EDM of these nuclei, the result of present work would permit to determine the values of the low energy constants and to identify the source of TRV.

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Nuclear spin dependence of time reversal invariance violating effects in neutron scattering

Abstract: The spin structure of parity violating and time reversal invariance violating effects in neutron scattering is discussed. The explicit relations between these effects are presented in terms of functions nuclear spins and neutron partial widths of p-wave resonances. *

Cited by 14 publications

References 16 publications

Time-reversal invariance violation in neutron-nucleus scattering

Time-reversal invariance violation in neutron-nucleus scattering

Parity and Time Reversal Invariance Violation in Neutron-Nucleus Scattering

Time-reversal violation in light nuclei

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