caa a22 4500 445872500 CHVBK 20180317145516.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1140/epja/i2011-11043-2 doi (NATIONALLICENCE)springer-10.1140/epja/i2011-11043-2 New results on P -odd asymmetry of $ \gamma$ -quanta emission in 10B(n,$ \alpha$)7Li* $ \rightarrow$ $ \gamma$ + 7Li(g.s.) nuclear reaction [Elektronische Daten] [V. Vesna, Yu. Gledenov, V. Nesvizhevsky, P. Sedyshev, E. Shulgina] 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. SIF, Springer-Verlag Berlin Heidelberg, 2011 Vesna V. Petersburg Nuclear Physics Institute RAS, Gatchina, Russia aut Gledenov Yu Joint Institute for Nuclear Research, Dubna, Russia aut Nesvizhevsky V. Institut Laue-Langevin, Grenoble, France aut Sedyshev P. Joint Institute for Nuclear Research, Dubna, Russia aut Shulgina E. Petersburg Nuclear Physics Institute RAS, Gatchina, Russia aut The European Physical Journal A Springer-Verlag 47/3(2011-03-01), 1-9 1434-6001 47:3<1 2011 47 10050 https://doi.org/10.1140/epja/i2011-11043-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1140/epja/i2011-11043-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vesna V. Petersburg Nuclear Physics Institute RAS, Gatchina, Russia aut NATIONALLICENCE 700 1- Gledenov Yu Joint Institute for Nuclear Research, Dubna, Russia aut NATIONALLICENCE 700 1- Nesvizhevsky V. Institut Laue-Langevin, Grenoble, France aut NATIONALLICENCE 700 1- Sedyshev P. Joint Institute for Nuclear Research, Dubna, Russia aut NATIONALLICENCE 700 1- Shulgina E. Petersburg Nuclear Physics Institute RAS, Gatchina, Russia aut NATIONALLICENCE 773 0- The European Physical Journal A Springer-Verlag 47/3(2011-03-01), 1-9 1434-6001 47:3<1 2011 47 10050 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer