Parity conserving<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">γ</mml:mi></mml:math>asymmetry in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>n</mml:mi></mml:math>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi></mml:math>radiative capture

Csótó, Attila; Gibson, B. F.; Payne, G. L.

doi:10.1103/physrevc.56.631

Cited by 13 publications

(5 citation statements)

References 27 publications

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“…Results at 3 meV obtained in SNPA are A LR γ = 0.607 × 10 −8 , 0.668 × 10 −8 , 0.665 × 10 −8 with RSC, Av14 and Nijmegen93 potentials, respectively [4]. Our result agrees to that with RSC, but there is about 10 % suppression to those with Av14 and Nijmegen93.…”

Section: Asymmetry Of Photon Direction In Np → Dγsupporting

confidence: 78%

“…1 shows the coordinate system we use in the calculation. We are interested in the asymmetry of out-going photons with respect to the axix x, which is proportional tok γ · (p n ×ŝ n ) = sin θ sin φ [4].…”

Section: Square Of the Amplitude With No Polarization Then Readsmentioning

confidence: 99%

“…1 shows the coordinate system we use in the calculation. We are interested in the asymmetry of out-going photons with respect to the axix x, which is proportional to kγ • (p n × ŝn ) = sin θ sin φ [4]. Since the asymmetry is to the left and the right of the neutron spin, and conserves the sign under the parity conversion, we call it parity-conserving(PC) left-right asymmetry, A LR γ .…”

Section: Asymmetry Of Photon Direction In Np → Dγmentioning

confidence: 99%

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Spin Observables in the Two-Nucleon Capture and Dissociation Processes at Low Energies

Song¹,

Hyun²,

Ando³

et al. 2012

Few-Body Syst

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Spin observables in radiative neutron capture on a proton and its inverse process, photodisintegration of the deuteron are calculated using a pionless effective field theory with di-baryon fields. Good agreement with the results of existing standard nuclear physics approach is obtained at very low energies. As energy increases, however, the discrepancy between the effective field theory and the standard nuclear physics approach becomes substantial. We discuss the origin of the difference.

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Section: Asymmetry Of Photon Direction In Np → Dγsupporting

confidence: 78%

Section: Square Of the Amplitude With No Polarization Then Readsmentioning

confidence: 99%

Section: Asymmetry Of Photon Direction In Np → Dγmentioning

confidence: 99%

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Spin Observables in the Two-Nucleon Capture and Dissociation Processes at Low Energies

Song¹,

Hyun²,

Ando³

et al. 2012

Few-Body Syst

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show abstract

“…Therefore the mixing of the parity-allowed left-right asymmetries into the parity-violating up-down asymmetries is given by A f alse = δϑA LR , with δϑ = 32 mrad. The parity-allowed left-right asymmetry in the reaction n + p → d + γ has been calculated to be 2.3 × 10 −8 at 10 meV [70]. The false asymmetry caused by mixing this left-right asymmetry into the up-down detector channel is then ≃ 7 × 10 −10 and is therefore negligible.…”

Section: Parity Allowed Left-right Asymmetriesmentioning

confidence: 89%

Measurement of parity-violatingγ-ray asymmetry in the capture of polarized cold neutrons on protons

et al. 2011

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The NPDGamma collaboration reports results from the first phase of a measurement of the parity violating up-down asymmetry Aγ with respect to the neutron spin direction of γ-rays emitted in the reaction n + p → d + γ using the capture of polarized cold neutrons on the protons in a liquid parahydrogen target. One expects parity-odd effects in the hadronic weak interaction (HWI) between nucleons to be induced by the weak interaction between quarks. Aγ in n + p → d + γ is dominated by a ∆I = 1, 3 S1 − 3 P1 parity-odd transition amplitude in the n-p system. The first phase of the measurement was completed at the Los Alamos Neutron Science Center spallation source (LANSCE) with the result Aγ = (−1.2 ± 2.1 stat. ± 0.2 sys.) × 10 −7 . We also report the first measurement of an upper limit for the parity allowed left right asymmetry in this reaction, with the result Aγ,LR = (−1.8 ± 1.9 stat. ± 0.2 sys.) × 10 −7 . In this paper we give a detailed report on the theoretical background, experimental setup, measurements, extraction of the parity-odd and parity-allowed asymmetries, analysis of potential systematic effects, and the LANSCE results. The asymmetry has an estimated size of 5 × 10 −8 and the aim of the NPDGamma collaboration is to measure it to 1 × 10 −8 . The second phase of the measurement will be performed at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory.

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“…Segmentation of the detector is required to resolve the angular dependence of the expected parity-violating signal and discriminate false effects. For example, there is a predicted parity-conserving gamma asymmetry of A P C γ = 7 × 10 −9 [20] in the np capture. This process gives an asymmetry about the same magnitude as our sensitivity goal for the parity violating signal, but with an angular distribution orthogonal to the parity violating signal.…”

Section: Conceptual Design Of N + P → D + γ Experimentsmentioning

confidence: 99%

Progress toward a new measurement of the parity violating asymmetry in n→+p→d+γ

Snow

Wilburn

Bowman

et al. 2003

Nuclear Instruments and Methods in Physics Research Section A:

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We outline the motivation and conceptual design for a new experiment aimed at a 10-fold improvement in the accuracy of the parity-violating asymmetry A γ in the angular distribution of 2.2 MeV gamma rays from the n + p → d + γ reaction. This observable is primarily sensitive to the weak pion-nucleon coupling H 1 π . A proof-of-principle experiment using unpolarized low-energy neutron capture on polyethylene and an array of 12 CsI detectors operated in current mode has been performed. Results of this test experiment including the current mode signal, electronic noise and detector sensitivity to magnetic fields are reported.

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Parity conservingγasymmetry inn-pradiative capture

Cited by 13 publications

References 27 publications

Spin Observables in the Two-Nucleon Capture and Dissociation Processes at Low Energies

Spin Observables in the Two-Nucleon Capture and Dissociation Processes at Low Energies

Measurement of parity-violatingγ-ray asymmetry in the capture of polarized cold neutrons on protons

Progress toward a new measurement of the parity violating asymmetry in n→+p→d+γ

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