I. A. Krasnoschekova

Publications (8)0 Total impact

• Article: Search for mirror dark matter in a laboratory experiment with ultracold neutrons

  A. P. Serebrov, E. B. Aleksandrov, N. A. Dovator, S. P. Dmitriev, A. K. Fomin, P Geltenbort, A. G. Kharitonov, I. A. Krasnoschekova, M. S. Lasakov, A. N. Murashkin, G. E. Shmelev, V. E. Varlamov, A. V. Vassiljev, O. M. Zherebtsov, O. Zimmer
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  ABSTRACT: Mirror matter is considered as a candidate for dark matter. To investigate this possibility an experimental search for neutron - mirror neutron transitions has been carried out using storage of ultracold neutrons in a trap with different magnetic fields. As a result, a new limit for the neutron - mirror neutron oscillation time tau_osc has been obtained, tau_osc >= 448 s (90% C.L.). As a side result, some restriction of the presence of a mirror magnetic field in the range 0 - 1200 nT has been obtained.
  10/2008;
• Source

  Available from: A. K. Fomin

  Article: Experimental search for neutron - mirror neutron oscillations using storage of ultracold neutrons

  A. P. Serebrov, E. B. Aleksandrov, N. A. Dovator, S. P. Dmitriev, A. K. Fomin, P Geltenbort, A. G. Kharitonov, I. A. Krasnoschekova, M. S. Lasakov, A. N. Murashkin, G. E. Shmelev, V. E. Varlamov, A. V. Vassiljev, O. M. Zherebtsov, O. Zimmer
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  ABSTRACT: The idea of a hidden sector of mirror partners of elementary particles has attracted considerable interest as a possible candidate for dark matter. Recently it was pointed out by Berezhiani and Bento that the present experimental data cannot exclude the possibility of a rapid oscillation of the neutron n to a mirror neutron n' with oscillation time much smaller than the neutron lifetime. A dedicated search for vacuum transitions n->n' has to be performed at weak magnetic field, where both states are degenerate. We report the result of our experiment, which compares rates of ultracold neutrons after storage at a weak magnetic field well below 20 nT and at a magnetic field strong enough to suppress the seeked transitions. We obtain a new limit for the oscillation time of n-n' transitions, tau_osc (90% C.L.) > 414 s. The corresponding limit for the mixing energy of the normal and mirror neutron states is delta_m (90% C.L.) < 1.5x10-18 eV.
  07/2007;
• Article: Comment to the article "Possible Systematic Effects in Fomblin Coated Storage Cell Neutron Lifetime Measurements", Steve K. Lamoreaux [1]

  A. P. Serebrov, V. E. Varlamov, A. G. Kharitonov, A. K. Fomin, Yu. N. Pokotilovski, P Geltenbort, I. A. Krasnoschekova, M. S. Lasakov, R. R. Tal'daev, A. V. Vassiljev, O. M. Zherebtsov
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  ABSTRACT: The author of article discusses the possible systematic effects in our experiment using reference and picture from allegedly our publication. First of all this publication does not exist. The assumption of author about the probability of lower energy upscattering is in a rough contradiction (300 times) with our experimental limit which is extremely lower, about 6x10-9 per neutron collision. The second assumption of author concerning quasi-stable orbits of UCN with higher energy due to specular neutron reflection from trap wall is also in a rough contradiction with our experimental data clear demonstrated in our previous articles as well in the last very detailed article recently presented in the arXiv. We are very surprised that author discusses well known questions studied in our experiment in details.
  07/2007;
• Source

  Available from: A. K. Fomin

  Article: Neutron lifetime measurements using gravitationally trapped ultracold neutrons

  A. P. Serebrov, V. E. Varlamov, A. G. Kharitonov, A. K. Fomin, Yu. N. Pokotilovski, P Geltenbort, I. A. Krasnoschekova, M. S. Lasakov, R. R. Taldaev, A. V. Vassiljev, O. M. Zherebtsov
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  ABSTRACT: Experiment using gravitationally trapped ultracold neutrons (UCNs) to measure the neutron lifetime is reviewed. The precise value of the neutron lifetime is of fundamental importance to particle physics and cosmology. In our experiment, the UCN storage time is brought closest ever to the neutron lifetime: the probability of the UCN loss from the trap was only 1% of that for neutron beta-decay. The neutron lifetime obtained, 878.5+/-0.7stat+/-0.3sys s, is the most accurate one to date.
  03/2007;
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  Available from: A. K. Fomin

  Article: Low-energy heating of ultracold neutrons during their storage in material bottles

  A P Serebrov, J Butterworth, M Daum, A K Fomin, P Geltenbort, K Kirch, I A Krasnoschekova, M S Lasakov, Yu P Rudnev, V E Varlamov, A V Vassiljev, P R Holland
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  ABSTRACT: We have studied the low-energy heating of ultracold neutrons during their storage. On fomblin, it is greatly suppressed for the low temperature liquid and at solidification. For non-magnetic solid materials, upper limits of 5 × 10 −9 (Be) and 3.6 × 10 −8 (Cu) per collision were found. Therefore, low-energy heating is not the reason for "anomalous losses" of (2–3) × 10 −5 per collision on beryllium surfaces.  2003 Elsevier Science B.V. All rights reserved.
  Physics Letters A. 01/2003; 309:218-224.
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  Available from: A. K. Fomin

  Article: Depolarization of ultracold neutrons during their storage in material bottles

  A P Serebrov, M S Lasakov, A V Vassiljev, I A Krasnoschekova, Yu P Rudnev, A K Fomin, V E Varlamov, P Geltenbort, J Butterworth, A R Young, U Pesavento, P R Holland
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  ABSTRACT: The depolarization of ultracold neutrons (UCN) during their storage in traps has been investigated. The neutron spin-flip probability for the materials studied amounts to ∼ (1–2) × 10 −5 per collision and does not depend on the temperature. The possible connection between the phenomenon of UCN depolarization and that of anomalous losses is discussed.  2003 Published by Elsevier Science B.V.
  01/2002;
• Source

  Available from: A. K. Fomin

  Article: Search for neutron-mirror neutron oscillations in a laboratory experiment with ultracold neutrons

  A P Serebrov, E B Aleksandrov, N A Dovator, S P Dmitriev, A K Fomin, P Geltenbort, A G Kharitonov, I A Krasnoschekova, M S Lasakov, A N Murashkin, G E Shmelev, V E Varlamov, A V Vassiljev, O M Zherebtsov, O Zimmer
• Article: Experimental search for neutron–mirror neutron oscillations using storage of ultracold neutrons

  A.P. Serebrov, E.B. Aleksandrov, N.A. Dovator, S.P. Dmitriev, A.K. Fomin, P. Geltenbort, A.G. Kharitonov, I.A. Krasnoschekova, M.S. Lasakov, A.N. Murashkin, G.E. Shmelev, V.E. Varlamov, A.V. Vassiljev, O.M. Zherebtsov, O. Zimmer
  [show abstract] [hide abstract]
  ABSTRACT: The idea of a hidden sector of mirror partners of elementary particles has attracted considerable interest as a possible candidate for dark matter. Recently it was pointed out by Berezhiani and Bento that the present experimental data cannot exclude the possibility of a rapid oscillation of the neutron n to a mirror neutron n′ with oscillation time much smaller than the neutron lifetime. A dedicated search for vacuum transitions n→n′ has to be performed at weak magnetic field, where both states are degenerate. We report the result of our experiment, which compares rates of ultracold neutrons after storage at a weak magnetic field well below 20 nT and at a magnetic field strong enough to suppress the seeked transitions. We obtain a new limit for the oscillation time of n–n′ transitions, τosc(90% C.L.)>414 s. The corresponding limit for the mixing energy of the normal and mirror neutron states is δm(90% C.L.)<1.5×10−18 eV.
  Physics Letters B.