Nature of parity violation in neutron interaction with lead

Andrzejewski, J.; Gundorin, N. A.; Karpikhin, I.L.; Lason, L.; Lobov, G.A.; Matveev, D. V.; Pikelner, L.B.

doi:10.1134/1.1777279

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…All of the nonzero PV spin rotation observations so far seen with meV energy neutron beams come from larger effects in compound nuclear resonances from the tails of a higher-energy p-wave resonance. In the case of Pb, there is still some controversy about which isotope is enhanced [30,[76][77][78].…”

Section: N + 4 He Parity-odd Neutron Spin Rotation Theorymentioning

confidence: 99%

Experimental upper bound and theoretical expectations for parity-violating neutron spin rotation in He4

Swanson

Heckel²,

Bass

et al. 2019

Phys. Rev. C

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Neutron spin rotation is expected from quark-quark weak interactions in the Standard Model, which induce weak interactions among nucleons that violate parity. We present the results from an experiment searching for the effect of parity violation via the spin rotation of polarized neutrons in a liquid 4 He medium. The value for the neutron spin rotation angle per unit length in 4 He, dφ/dz = (+2.1 ± 8.3(stat.) +2.9 −0.2 (sys.)) × 10 −7 rad/m, is consistent with zero. The result agrees with the best current theoretical estimates of the size of nucleon-nucleon weak amplitudes from other experiments and with the expectations from recent theoretical approaches to weak nucleon-nucleon interactions. In this paper we review the theoretical status of parity violation in the n+ 4 He system and discuss details of the data analysis leading to the quoted result. Analysis tools are presented that quantify systematic uncertainties in this measurement and that are expected to be essential for future measurements.

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Section: N + 4 He Parity-odd Neutron Spin Rotation Theorymentioning

confidence: 99%

Experimental upper bound and theoretical expectations for parity-violating neutron spin rotation in He4

Swanson

Heckel²,

Bass

et al. 2019

Phys. Rev. C

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“…In another recent example, a series of experiments that first observed parity-odd neutron spin rotation in natural Pb [307] and subsequent experiments on spin rotation in separated lead isotopes [308] led to a prediction of the first-known subthreshold p-wave resonance in neutron-nucleus interactions in the isotope with the large parity violation [309]. Although this isotope was thought to be 204 Pb according to the results of a spin rotation experiment at HMI [310], a subsequent neutron radiative capture experiment seems to indicate that 207 Pb possesses the subthreshold p-wave resonance [311].…”

Section: Test Of Statistical Theories For Heavy Nuclei Matrix Elementsmentioning

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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“…This work is a continuation of the experiment [29] performed with the correlation gamma-spectrometer COCOS [30] at the JINR pulse reactor IBR-2 with a power of 2 MW and frequency 5 Hz in a direct thermal neutron flux of 5×10 5 n/cm 2 /s. We investigated in that work the gamma-ray energy range (2134-2158) keV chosen on the base of the prediction of Ref.…”

mentioning

confidence: 99%

Experimental search for the singlet metastable deuteron in the radiative n-p capture

Борзаков

Gundorin

Pokotilovski

2015

Phys. Part. Nuclei Lett.

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We performed an experimental search for the bound state singlet deuteron predicted in some microscopic calculations.The experiment consists in a high statistics measurement of  -ray spectra after thermal neutron capture by hydrogen nuclei. The upper limit is obtained for the probability of the 3 S 1  1 S 0  -transition population of the deuteron singlet bound state with the bound energy in the interval 25-125 keV.

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Nature of parity violation in neutron interaction with lead

Cited by 5 publications

References 5 publications

Experimental upper bound and theoretical expectations for parity-violating neutron spin rotation in He4

Experimental upper bound and theoretical expectations for parity-violating neutron spin rotation in He4

Fundamental Neutron Physics

Experimental search for the singlet metastable deuteron in the radiative n-p capture

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