N. N. Kolachevsky, Yu. V. Prokof'ichev, V. R. Skoi, I. I. Sobel'man, V. N. Sorokin, “An optically polarised dense <sup>3</sup>He target as a spin filter for slow-neutron beams”, Kvantovaya Elektronika, 2003, Volume 33, Number 1,Pages <nobr>18

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Special issue devoted to the 80th anniversary of academician N. G. Basov's birth

An optically polarised dense ³He target as a spin filter for slow-neutron beams

N. N. Kolachevsky^a, Yu. V. Prokof'ichev^b, V. R. Skoi^b, I. I. Sobel'man^a, V. N. Sorokin^a

^a P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow
^b Joint Institute for Nuclear Research, Frank Laboratory of Neutron Physics, Dubna, Moscow region

Abstract: The possibility of polarising ³He and preserving the polarisation in an external magnetic field of 0.05 Oe is demonstrated experimentally. A neutron filter with an extremely weak guiding field is fabricated for obtaining polarised neutron beams. The degree of polarisation equal to 25% was obtained for 0.025-eV neutrons. Some fields of application of other polarised noble gases are considered. The cross section for cross-relaxation of nuclear polarisation in the ¹²⁹Xe – ¹³¹Xe mixture is estimated.

PACS: 75.25.+z, 67.65.+z, 32.80.Bx

Received: 10.06.2002