Electromagnetic transitions between the low-lying levels of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ne</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>21</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>and their relation to parity mixing of the 2.80-MeV<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:

Millener, D.J.; Warburton, E.K.; Snover, K. A.; Lintig, R. von; Ikossi, P.G.

doi:10.1103/physrevc.18.1878

Cited by 14 publications

(6 citation statements)

References 32 publications

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“…2). For one standard deviation, the data imply | S-| <0.6, in agreement with the "best" theoretical result of Millener et al, 5 6. = 0.13.…”

Section: A" = [A(el)+a(m2)6j]/{l + 6j)supporting

confidence: 88%

“…With the present measurement of 6_, and current knowledge of energies, lifetimes, and branching ratios of the levels, 5 …”

mentioning

confidence: 87%

“…The technique suggested by Millener etal. 5 of measuring the circular polarization of y rays from a polarized initial state was attempted during previous parity-nonconserving measurements 1 but was unsuccessful because of small polarization transfer in the reaction 21 Ne(£ pol ,/>').…”

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confidence: 99%

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Measurement of Pair Emission from the 2.8-MeV Parity-Mixed Doublet ofNe21

et al. 1981

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The branching ratio for pair emission for the ground-state transition from the J 71~\ "', 2789-keV level of 21 Ne has been measured relative to the branching ratio for the transition from the «/ 7r = i + , 2796-keV level. The result indicates that the former transition is predominantly El in multipolarity [6(M2/E1) <0.6] and therefore that measurements of y-ray circular polarization for this transition are very sensitive to parity mixing in the spin-i doublet.

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“…2). For one standard deviation, the data imply | S-| <0.6, in agreement with the "best" theoretical result of Millener et al, 5 6. = 0.13.…”

Section: A" = [A(el)+a(m2)6j]/{l + 6j)supporting

confidence: 88%

“…With the present measurement of 6_, and current knowledge of energies, lifetimes, and branching ratios of the levels, 5 …”

mentioning

confidence: 87%

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Measurement of Pair Emission from the 2.8-MeV Parity-Mixed Doublet ofNe21

et al. 1981

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“…of Ref [23]. have been calculated and shown to be in reasonable agreement with the results of the model of Ref [23],.…”

supporting

confidence: 77%

Toward a Consistent Description of Parity Nonconservation inA=18−21Nuclei

Horoi

Brown

1995

Phys. Rev. Lett.

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The current theoretical analyses of the parity nonconserving (PNC) experiments in light nuclei fail to provide a consistent description of the experimental data for ' F, ' F, and 'Ne. We perform a "piecewise" analysis of the PNC matrix elements in the Op&/2-Od5/2-1sl/2 model space and show that by using a proper overall normalization of the isoscalar and isovector parts we can consistently describe all three PNC experimental data. New calculations are also presented for the s p sd p-f -mo-del space which support our analysis. PACS numbers: 24.80.Dc, 11. 30.Er, 21.60.Cs, 27.20.+n The investigations of low energy parity nonconservation (PNC) phenomena in light nuclei have as a goal to provide more reliable results for the hadron-meson weak coupling constants. These couplings are of importance for our understanding of the quark behavior inside the nucleons under the influence of the fundamental interactions. These investigations necessitate both very delicate experiments and very reliable nuclear structure calculations of the matrix elements for a correct extraction of the weak nucleon-meson coupling constants. Most of the results on the experimental and theoretical PNC studies in light nuclei have been presented in a review paper [1]. From the proposed cases during the last 25 years in this range of nuclei, four cases have been selected as reliable enough for experimental and theoretical analysis. They involve parity mixed doublets (PMD) [1] in ' N, 'sF, '9F, and 2'Ne. Two others cases involving PMD's in '60 [2] and 2oF [3] have been proposed recently. From the four mentioned cases, only the ' F has been measured with a result larger then the experimental error. All other cases have been measured with errors larger ('sF and 2'Ne) or near the result ('4N).However, the upper limits obtained for '~F and 'Ne are so small that they impose severe constraints on the different contributions to the PNC matrix elements. These results, compared to current theoretical calculations, have shown a discrepancy, which has not yet been solved (see also Fig. 11 from Ref. [4]). Namely, if one interprets the small limit of the (experimentally) extracted PNC matrix element ((0.029 eV) for 2'Ne as a destructive interference between the isoscalar and the isovector contribution [1], then it is difficult to understand why the isovector contribution in 's F is so small ((0.09 eV) and the constructive isoscalar + isovector contribution in ' F is relatively large (0.40~0.10). In the last few years, efforts have been made to improve the shell-model calculations with special emphasis on the description of the weak observables [5,6]. Recently, two new interactions have been developed by Warburton and Brown [7], which were designed to accurately describe the energies of states in nuclei with A = 10 -22. The interaction was designed for pure oscillator excitations [e.g. , OIico (Op)" configurations, 1Itco (Op)" '(Odls)' configurations, etc. ], but methods have been developed to use them when mixed n Fico excitations contribute [6,8]. Recently, w...

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“…Furthermore, it gives a small negative value of X$. This feature makes posiible large cancellations of the contributions relative to X.,/ and XNn in the transition i-(2.789 MeV) --+ $+ in 21Ne [47], and thus may explain the absence of effect at the expected level in this process [48]. Using the expression of the asymmetry A,, :…”

Section: Comparison With Experimentsmentioning

confidence: 99%

Unified treatment of the parity violating nuclear force

1980

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We discuss the weak amplitudes which determine the parity violating nuclear force. By use of the quark model and the SU(6), symmetry, we unite the treatment of pion and vector meson vertices, and describe the interrelation of past techniques which have been applied to this problem. This allows us to catalog the uncertainties in the amplitudes, and to provide reasonable bounds on their values. The connection of OUT results with experiment is also discussed.

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Electromagnetic transitions between the low-lying levels ofNe21and their relation to parity mixing of the 2.80-MeV

Cited by 14 publications

References 32 publications

Measurement of Pair Emission from the 2.8-MeV Parity-Mixed Doublet ofNe21

Measurement of Pair Emission from the 2.8-MeV Parity-Mixed Doublet ofNe21

Toward a Consistent Description of Parity Nonconservation inA=18−21Nuclei

Unified treatment of the parity violating nuclear force

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