Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

Full text (en)

E. S. Konobeevski, M. V. Mordovskoy, I. M. Sharapov, S. I. Potashev, S. V. Zuyev

Institute for Nuclear Research, Russian Academy of Sciences, Moscow, Russia

Abstract: We report preliminary results of a kinematically complete experiment on measurement of nd breakup reaction yield at neutron beam RADEX of Institute for Nuclear Research (Moscow, Russia). In the experiment two secondary neutrons are detected in geometry of neutron-neutron final-state interaction. Data are obtained at energy of incident neutrons E_n = 40 - 60 MeV for various divergence angles of two neutrons ΔΘ = 4, 6, 8°. ¹S₀ neutron-neutron scattering lengths a_nn were determined by comparison of the experimental dependence of reaction yield on the relative energy of two secondary neutrons with results of simulation depending on a_nn. For E_n = 40 MeV and ΔΘ = 6° (the highest statistics in the experiment) the value a_nn = -17.9 ± 1.0 fm is obtained. The further improving of accuracy of the experiment and more rigorous theoretical analysis will allow one to remove the existing difference in a_nn values obtained in different experiments.

Keywords: breakup reaction, neutron, deuteron, neutron-neutron scattering length.

1. Miller G.A, Nefkens B.M.K., Šlaus I. Phys. Rep. 194 (1990) 1. https://doi.org/10.1016/0370-1573(90)90102-8

2. Huhn V., Watzold L., Weber C. et al. Phys. Rev. C 63 (2000) 014003. https://doi.org/10.1103/PhysRevC.63.014003

3. W. von Witsch, Ruan X., Witala H. Phys. Rev. C 74 (2006) 014001. https://doi.org/10.1103/PhysRevC.74.014001

4. Gabioud B. et al. Phys. Rev. Lett. 42 (1979) 1508. https://doi.org/10.1103/PhysRevLett.42.1508

5. Howell C. R. et al. Phys. Lett. B 444 (1998) 252. https://doi.org/10.1016/S0370-2693(98)01386-0

6. Gonzalez Trotter D. E. et al. Phys. Rev. Lett. 83 (1999) 3788. https://doi.org/10.1103/PhysRevLett.83.1268

7. Gonzalez Trotter D. E. et al. Phys. Rev. C 73 (2006) 034001. https://doi.org/10.1103/PhysRevC.73.034001

8. Burmistrov Yu. M., Zuev S. V., Konobeevski E. S. et al. Instrum. Exp. Tech. 52 (2009) 769. https://doi.org/10.1134/S0020441209060025