Parity nonconservation in polarized-neutron transmission through<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">La</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>139</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Yuan, V. W.; Bowman, C.D.; Bowman, J. D.; Bush, J. E.; Delheij, P. P. J.; Frankle, C.M.; Gould, C.R.; Haase, D. G.; Knudson, J. N.; Mitchell, G. E.; Penttilä, S. I.; Postma, H.; Roberson, N. R.; Seestrom, S. J.; Szymański, J.; Zhu, X.

doi:10.1103/physrevc.44.2187

Cited by 58 publications

(26 citation statements)

References 12 publications

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“…The origin of the parity-violating effect in 139 La is known to be due to mixing with a narrow p-wave resonance at 0.734 eV. The huge (∼ 10%) parity-odd effects at resonance in this [11] and many other heavy nuclei [12] are now understood in terms of two mechanisms: dynamical enhancement, which comes from the close spacing of two levels of opposite parity in the compound resonance regime; and kinematic enhancement, which is due to the difference in widths of the s and p resonances involved in the interference. The size of the effect for cold neutron energies below the 139 La resonance is as expected from the tail of this resonance.…”

Section: Introductionmentioning

confidence: 82%

A measurement of parity-violating gamma-ray asymmetries in polarized cold neutron capture on , , and

Mitchell

Blessinger

Bowman

et al. 2004

Nuclear Instruments and Methods in Physics Research Section A:

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A measurement of parity-violating gamma-ray asymmetries in polarized cold neutron capture on AbstractAn apparatus for measuring parity-violating asymmetries in gamma-ray emission following polarized cold neutron capture was constructed as a 1/10th scale test of the design for the forthcoming − → n + p → d + γ experiment at LANSCE. The elements of the polarized neutron beam, including a polarized 3 He neutron spin filter and a radio frequency neutron spin rotator, are described. Using CsI(Tl) detectors and photodiode current mode readout, measurements were made of asymmetries in gamma-ray emission following neutron capture on 35 Cl, 113 Cd, and 139 La targets. Upper limits on the parity-allowed asymmetry s n · (k γ × k n ) were set at the level of 7 × 10 −6 for all three targets. Parity-violating asymmetries s n · k γ were observed in 35 Cl, A γ = (−29.1 ± 6.7) × 10 −6 , and 139 La, A γ = (−15.5 ± 7.1) × 10 −6 , values consistent with previous measurements.

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Section: Introductionmentioning

confidence: 82%

A measurement of parity-violating gamma-ray asymmetries in polarized cold neutron capture on , , and

Mitchell

Blessinger

Bowman

et al. 2004

Nuclear Instruments and Methods in Physics Research Section A:

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“…It has been over half a century since Lee and Yang first suggested the possibility of parity non-conservation in the weak interaction [45], which was confirmed expermentially shortly thereafter by Wu et al [46][47][48][49][50]. Modern day experimental [51][52][53][54][55][56][57][58][59][60] and theoretical [61][62][63][64][65] studies have given attention to parity violating two-nucleon processes, where the strong interactions are most precisely understood.…”

mentioning

confidence: 99%

Relativistic, model-independent, multichannel 2→2 transition amplitudes in a finite volume

2016

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We derive formalism for determining 2 + J → 2 infinite-volume transition amplitudes from finitevolume matrix elements. Specifically, we present a relativistic, model-independent relation between finite-volume matrix elements of external currents and the physically observable infinite-volume matrix elements involving two-particle asymptotic states. The result presented holds for states composed of two scalar bosons. These can be identical or non-identical and, in the latter case, can be either degenerate or non-degenerate. We further accommodate any number of strongly-coupled two-scalar channels. This formalism will, for example, allow future lattice QCD calculations of the ρ-meson form factor, in which the unstable nature of the ρ is rigorously accommodated.

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“…(38) and (39). Applying this result for the calculations of the forward and reverse transmissions, T F and T R , for our experimental setup we obtain the relation…”

Section: Triv Transmission Theoremmentioning

confidence: 69%

Search for time reversal invariance violation in neutron transmission

Bowman¹,

Gudkov²

2014

Phys. Rev. C

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Time Reversal Invariant Violating (TRIV) effects in neutron transmission through a nuclear target are discussed. We demonstrate the existence of a class of experiments that are free from false asymmetries. We discuss the enhancement of TRIV effects for neutron energies corresponding to p-wave resonances in the compound nuclear system. We analyze a model experiment and show that such tests can have a discovery potential of 10 2 − 10 4 compared to current limits.

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Parity nonconservation in polarized-neutron transmission throughLa139

Cited by 58 publications

References 12 publications

A measurement of parity-violating gamma-ray asymmetries in polarized cold neutron capture on , , and

A measurement of parity-violating gamma-ray asymmetries in polarized cold neutron capture on , , and

Relativistic, model-independent, multichannel 2→2 transition amplitudes in a finite volume

Search for time reversal invariance violation in neutron transmission

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