https://doi.org/10.1140/epja/i2011-11043-2
Regular Article - Experimental Physics
New results on P -odd asymmetry of 
-quanta emission in 10B(n,
)7Li*
+ 7Li(g.s.) nuclear reaction
1
Petersburg Nuclear Physics Institute RAS, Gatchina, Russia
2
Joint Institute for Nuclear Research, Dubna, Russia
3
Institut Laue-Langevin, Grenoble, France
* e-mail: nesvizhevsky@ill.eu
Received:
22
October
2010
Accepted:
14
February
2011
Published online:
23
March
2011
A series of ultra-sensitive experiments has been carried out in 2001-2009 at the ILL measuring P -odd asymmetry in -quanta emission in the nuclear reaction 10B (n,) 7Li*
+ $7Li$(g.s.) with polarized cold neutrons. The resulting value of the asymmetry coefficient is 
. 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 
(at 90% c.l.). This constraint agrees with that following from the nuclear reaction 6Li (n,) 3H : 
(at 90% c.l.). However, they both contradict the “best” value in the quark model by Desplanques, Donoughe, and Holstein 
. We invite experts in the field to contribute to the theoretical analysis of the problem.
© SIF, Springer-Verlag Berlin Heidelberg, 2011
