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New results on P -odd asymmetry of \( \gamma\) -quanta emission in 10B(n,\( \alpha\))7Li* \( \rightarrow\) \( \gamma\) + 7Li(g.s.) nuclear reaction

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Abstract.

A series of ultra-sensitive experiments has been carried out in 2001-2009 at the ILL measuring P -odd asymmetry in \( \gamma\) -quanta emission in the nuclear reaction 10B (n,\( \alpha\)) 7Li* \( \rightarrow\) \( \gamma\) + $7Li$(g.s.) with polarized cold neutrons. The resulting value of the asymmetry coefficient is \(\ensuremath \alpha_{P\mbox{-}{\rm odd}}= +(0.0 \pm 2.6_{{\rm stat}} \pm 1.1_{{\rm syst}}) \times 10^{-8}\) . These experiments profited from high-intensity PF1B neutron facility and a new version of the integral measuring method: for decreasing experimental uncertainties, the frequency of neutron spin-flip was higher than a typical reactor power noise frequency. Using the new value, we constrain the weak neutral current constant in the cluster model framework to \(\ensuremath f_{\pi}^{^{10}\rm B} \leq 0.6 \times 10^{-7}\) (at 90% c.l.). This constraint agrees with that following from the nuclear reaction 6Li (n,\( \alpha\)) 3H : \(\ensuremath f_{\pi}^{^{6}\rm Li} \leq 1.1 \times 10^{-7}\) (at 90% c.l.). However, they both contradict the “best” value in the quark model by Desplanques, Donoughe, and Holstein \(\ensuremath f_{\pi}^{{\rm DDH}}=4.6\cdot 10^{-7}\) . We invite experts in the field to contribute to the theoretical analysis of the problem.

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References

  1. V.I. Kukulin et al., Nucl. Phys. A 417, 128 (1984)

    Article  ADS  Google Scholar 

  2. T. Kajino et al., Nucl. Phys. A 413, 323 (1984)

    Article  ADS  Google Scholar 

  3. V.A. Vesna et al., Phys. At. Nucl. 62, 522 (1999)

    Google Scholar 

  4. S.Yu. Igashov, Proceedings of ISINN-11 (JINR, Dubna, 2004) p. 34

  5. B. Desplanques et al., Ann. Phys. 124, 449 (1980)

    Article  ADS  Google Scholar 

  6. V.A. Vesna, Yu.M. Gledenov et al., Bull. Russ. Acad. Sci.: Phys. 67, 125 (2003)

    Google Scholar 

  7. V.A. Vesna, Proceedings of ISINN-11(JINR, Dubna, 2004) p. 52

  8. M.M. Nesterov, I.S. Okunev, JETP Lett. 48, 621 (1988)

    ADS  Google Scholar 

  9. V.A. Vesna et al., Phys. Rev. C 77, 035501 (2008)

    Article  ADS  Google Scholar 

  10. H. Abele et al., Nucl. Instrum. Methods A 562, 407 (2006)

    Article  ADS  Google Scholar 

  11. Y.G. Abov et al., Nucl. Phys. 34, 506 (1962)

    Google Scholar 

  12. Yu.M. Gledenov et al., Nucl. Instrum. Methods A 350, 517 (1994)

    Article  ADS  Google Scholar 

  13. A.L. Barabanov et al., Phys. At. Nucl. 66, 679 (2003)

    Article  Google Scholar 

  14. http://cns.pnpi.spb.ru/7UCN/articles/Fomin2.pdf

  15. V.A. Vesna, Yu.M. Gledenov et al., Phys. At. Nucl. 59, 23 (1996)

    Google Scholar 

  16. V.A. Vesna, E.V. Shulgina, Inst. Exp. Tech. 48, 47 (2005)

    Article  Google Scholar 

  17. E.A. Garusov et al., Kernenergie 26, 68 (1983)

    Google Scholar 

  18. V.A. Vesna, E.V. Shulgina, J. Tech. Phys. Lett. 34, 1060 (2008)

    Article  Google Scholar 

  19. V.A. Vesna, Yu.M. Gledenov et al., Nucl. Instrum. Methods A 611, 244 (2009)

    Article  ADS  Google Scholar 

  20. B.R. Holstein, J. Phys. G: Nucl. Part. Phys. 36, 104003 (2009)

    Article  ADS  Google Scholar 

Download references

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Correspondence to V. V. Nesvizhevsky.

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Communicated by A.A. Korsheninnikov

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Vesna, V.A., Gledenov, Y.M., Nesvizhevsky, V.V. et al. New results on P -odd asymmetry of \( \gamma\) -quanta emission in 10B(n,\( \alpha\))7Li* \( \rightarrow\) \( \gamma\) + 7Li(g.s.) nuclear reaction. Eur. Phys. J. A 47, 43 (2011). https://doi.org/10.1140/epja/i2011-11043-2

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  • DOI: https://doi.org/10.1140/epja/i2011-11043-2

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