Isotopic identification of the parity-violating neutron<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi></mml:math>-wave resonance at energy<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>E</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>=</mml:mo><mml:mn>3.2</mml:mn><mml:mn /></mml:math>eV in Xe

Skoy, V. R.; Sharapov, É. I.; Gundorin, N. A.; Popov, Yu. P.; Prokofichev, Yu. V.; Roberson, N. R.; Mitchell, G. E.

doi:10.1103/physrevc.53.r2573

Cited by 16 publications

(6 citation statements)

References 6 publications

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“…Amplifications of P -odd neutron amplitudes in compound nuclear resonances by factors of 10 6 above the 10 −7 effects expected for weak NN amplitudes compared to strong NN amplitudes have already been observed [5] in measurements of ∆σ P several heavy nuclei, including some at p-wave resonances in the few eV energy range such as 139 La [6], 131 Xe [7,8], and 81 Br [9][10][11], and 117 Sn. This amplification from mixing of nearby s and p-wave resonances was predicted theoretically before it was measured, and the same resonance amplification factor applies to a P -odd and T -odd amplitude up to factors of order unity.…”

Section: Experimental Approachmentioning

confidence: 85%

Snowmass White Paper: Precision Studies of Spacetime Symmetries and Gravitational Physics

Adelberger¹,

Budker²,

Folman³

et al. 2022

Preprint

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High-energy physics is primarily concerned with uncovering the laws and principles that govern nature at the fundamental level. Research in this field usually relies on probing the boundaries of established physics, an undertaking typically associated with extreme energy and distance scales. It is therefore unsurprising that particle physics has traditionally been dominated by large-scale experimental methods often involving high energies, such as colliders and storage rings, cosmological and astrophysical observations, large-volume detector systems, etc. The corresponding measurements are ideally suited for the discovery of new particles and interactions.However, high-sensitivity measurements in smaller experiments, often performed at lower energies, are presently experiencing a surge in importance for particle physics for at least two reasons. First, they exploit synergies to adjacent areas of physics with recent advances in experimental techniques and technology. Together with intensified phenomenological explorations, these advances have led to the realization that challenges associated with weak couplings or the expected suppression factors for new physics can be overcome with such methods while maintaining a large degree of experimental control. Second, many of these measurements broaden the range of particle-physics phenomena and observables relative to the above set of more conventional methodologies. Combining such measurements with the conventional efforts above therefore casts both a wider and tighter net for possible effects originating from physics beyond the Standard Model (BSM).The present work argues that this assessment points at a growing impact of such methods and measurements on high-energy physics, and it therefore warrants direct support as particle-physics research. More specifically, we discuss a sample of ongoing and future efforts in this context involving cold neutrons, a range of AMO-based studies, first-and higher-generation antimatter, and microscopic mechanical experiments including gravitationally entangled masses and optically levitated nanospheres. These efforts are poised to yield crucial insights into proposed BSM physics as diverse as novel short-range interactions, the small-scale structure of spacetime and in particular the fate of Lorentz, translation, CPT, CP, T, and P symmetries, the gravitational interaction of antimatter, certain quantum aspects of gravity, millicharged particles, gravitationalwave measurements, and dark matter. These synergies and their prospective physics output foreshadow a promising future for such types of experimental and theoretical activities. Leveraging the recent rapid progress and bright outlook associated with such studies for high-energy physics, could yield high returns, but requires substantial and sustained efforts by funding agencies.

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Section: Experimental Approachmentioning

confidence: 85%

Snowmass White Paper: Precision Studies of Spacetime Symmetries and Gravitational Physics

Adelberger¹,

Budker²,

Folman³

et al. 2022

Preprint

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show abstract

“…Searches for the 3-fold P -odd T -odd correlation require a polarized target. Nuclei have been identified ( 139 La, 131 Xe) that are polarizable in macroscopic quantities and possess large parity-odd asymmetries at low energy p-wave resonances [213][214][215]. The first steps toward such an experiment are in progress at KEK [216][217][218][219].…”

Section: T Violation In Neutron Reactionsmentioning

confidence: 99%

Fundamental Neutron Physics

Nico

Snow

2005

Annu. Rev. Nucl. Part. Sci.

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▪ Abstract Experiments using slow neutrons address a growing range of scientific issues spanning nuclear physics, particle physics, astrophysics, and cosmology. The field of fundamental physics using neutrons has experienced a significant increase in activity over the last two decades. This review summarizes some of the recent developments in the field and outlines some of the prospects for future research.

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“…Due to the proportionality between potential TRIV amplitudes and PV amplitudes, these future TRIV tests will need more complete and precise information on the properties of the resonances which exhibit large parity violation effects. In addition to new measurements of (n, γ) angular distributions [11] which can be used to determine the details of the quantum numbers of these = 1 (p-wave) resonances, it is also important to repeat previous measurements of P-odd neutron transmission asymmetries [5,12,13,14,15] with higher precision. By measuring the transmission asymmetry of longitudinally polarized neutrons through an unpolarized target, one can determine the parity-odd helicity dependence of the total cross section.…”

Section: Introductionmentioning

confidence: 99%

A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission

Schaper

Auton

Barrón‐Palos

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

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We describe a modular apparatus for use in parity-violation measurements in epithermal neutron-nucleus resonances with high instantaneous neutron fluxes at the Manuel Lujan Jr. Neutron Scattering Center at Los Alamos National Laboratory. This apparatus is designed to conduct high-precision measurements of the parity-odd transmission asymmetry of longitudinally polarized neutrons through targets containing nuclei with p-wave neutronnucleus resonances in the 0.1-10 eV energy regime and to accommodate a future search for time reversal violation in polarized neutron transmission through polarized nuclear targets. The apparatus consists of an adjustable neutron and gamma collimation system, a 3 He-4 He ion chamber neutron flux monitor, two identical cryostats for target cooling, an adiabatic eV-neutron spin flipper, a near-unit efficiency 6 Li-7 Li scintillation detector operated in current mode, a flexible CAEN data acquisition system, and a neutron spin filter based on spin-exchange optical pumping of 3 He gas. We describe the features of the apparatus design devoted to the suppression of systematic errors in parity-odd asymmetry measurements. We describe the configuration of the apparatus used to conduct a precision measurement of parity violation at the 0.7 eV p-wave resonance in 139 La which employs two identical 139 La targets, one to polarize the beam on the p-wave resonance using the weak interaction and one to analyze the polarization.

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Isotopic identification of the parity-violating neutronp-wave resonance at energyE0=3.2eV in Xe

Cited by 16 publications

References 6 publications

Snowmass White Paper: Precision Studies of Spacetime Symmetries and Gravitational Physics

Snowmass White Paper: Precision Studies of Spacetime Symmetries and Gravitational Physics

Fundamental Neutron Physics

A modular apparatus for use in high-precision measurements of parity violation in polarized eV neutron transmission

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