Персона: Гуров, Юрий Борисович
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Руководитель научной группы "Экзотические ядерные состояния"
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Гуров
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Юрий Борисович
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- ПубликацияТолько метаданныеThe Neutron Structure of the Ground State of 7He(2019) Demyanova, A. S.; Goncharov, S. A.; Ogloblin, A. A.; Sandukovsky, V. G.; Chernyshev, B. A.; Gurov, Y. B.; Lapushkin, S. V.; Чернышев, Борис Андреевич; Гуров, Юрий Борисович© 2019, Pleiades Publishing, Inc.A study of the neutron structure of the ground state of 7He has been performed by means of registration and analysis of the decay channels of the residual nuclei following absorption of stopped pions. In particular, the reactions 9Be(π−, d)X and 11B(π−, dd)X have been investigated where X denotes any system with five neutrons and two protons — the constituencies of a 7He nucleus. The results point out to the existence of a halo-like configuration of the ground state of 7He with all three neutrons outside of the alpha particle core. The structure of this complicated halo-like state is determined by the correlations of neutrons in the p3/2 and p1/2 shells. The result would be in agreement with the previous works pointing out to a considerable mixing of configurations containing neutrons in the p3/2 and p1/2 states.
- ПубликацияОткрытый доступIsospin triplet A=14: Search for states with enhanced radii(2020) Demyanova, A. S.; Danilov, A. N.; Ogloblin, A. A.; Starastsin, V. I.; Gurov, Y. B.; Гуров, Юрий Борисович© Published under licence by IOP Publishing Ltd.This article is devoted to study of isobar-Analogue states 1- in triplet A=14: 14C-14N-14O. Previously signs of neutron halo in the 1-, 6.09 MeV state of 14C were obtained by two independent groups. In this article we propose to study neighbouring nuclei 14N and 14O using the Modified diffraction model (MDM) method and the method of Asymptotic normalization coefficients (ANC). Methods were applied to experimental differential cross sections of 14C(α,α)14C scattering and reactions 13C(3He,d)14N and 14N(3He,t)14O. MDM and ANC gave practically similar within errors radii for the studied 1- states: The 6.09 MeV state in 14C-2.7 0.1 fm, the 8.06 MeV state in 14N-2.7 0.1 fm, the 5.17 MeV state in 14O-2.6 0.2 fm. Moreover, the signs of proton halo in the 1- state of 14N were obtained for the first time.
- ПубликацияОткрытый доступHalo-like structure in He-7 nucleus(2020) Demyanova, A. S.; Ogloblin, A. A.; Chernishev, B. A.; Goncharov, S. A.; Gurov, Y. B.; Lapushkin, S. V.; Чернышев, Борис Андреевич; Гуров, Юрий БорисовичA study of the neutron structure of the ground state of He-7 has been performed by means of registration and analysis of the decay channels of the residual nuclei following absorption of stopped pions. In particular, the reaction Be-9 (pi(-),d)X have been investigated where X denotes any system with five neutrons and two protons - the constituencies of a H-7 nucleus. It was shown that the structure of H-7 is determined by correlations of two neutrons in the states He-6 (0(+)), He-6 (2(+)) and one neutron in the shell p(3/2). The He-4+3n structure is not manifested in the ground state of H-7. The obtained results are consistent with the known data on considerable mixture of configurations "He-6 in its ground and first excited states plus a neutron" in the ground state of H-7. Comparison of the diffraction components of the differential cross-sections of the charge-exchange reactions (t, He-3) measured on Li-6 and Li-7 allowed extracting the radius of particle-unstable nucleus H-7. The latter occurred to be approximately equal to those of He-6 and H-7. The obtained result indicates to existence of the halo-like structure in H-7.
- ПубликацияТолько метаданныеThe study of the 12C states from the reaction 11B(3He, d)12C(2019) Starastsin, V. I.; Demyanova, A. S.; Danilov, A. N.; Ogloblin, A. A.; Gurov, Y.; Гуров, Юрий Борисович© Published under licence by IOP Publishing Ltd.The experiment was done to study 11B(3He, d)12C reaction with energy E(3He)=25 MeV. The aim of the experiment is to determine the properties of 12C states at high excitation energies and in particular to verify which of the conflicting spin-parity assignments of the 13.35 MeV state (2- or 4-) should be assigned. Behavior of the experimental angular distribution and also the DWBA calculation correspond to spin parity 4- for 13.35 MeV state.
- ПубликацияТолько метаданныеStates of 12N with Enhanced Radii(2020) Demyanova, A. S.; Danilov, A. N.; Ogloblin, A. A.; Starastsin, V. I.; Gurov, Y. B.; Гуров, Юрий Борисович© 2020, Pleiades Publishing, Inc.The differential cross sections of the 12C(3He, t)12N reaction leading to formation of the 1+ (ground state), 2+(0.96 MeV), 2−(1.19 MeV), and 1−(1.80 MeV) states of 12N are measured at E(3He) = 40 MeV. The analysis of the data is carried out within the modified diffraction model (MDM) and distorted wave Born approximation (DWBA). Enhanced rms radii were obtained for the ground, 2−(1.19 MeV), and 1−(1.80 MeV) states. We revealed that 12B, 12N, and 12C in the isobaric analogue states (IAS) with T = 1, and spin-parities 2− and 1− have increased radii and exhibit properties of neutron and proton halo states.
- ПубликацияОткрытый доступSpectroscopy of 7He in stopped pion absorption(2020) Demyanova, A. S.; Ogloblin, A. A.; Sandukovsky, V. G.; Chernyshev, B. A.; Gurov, Y. B.; Lapushkin, S. V.; Leonova, T. I.; Чернышев, Борис Андреевич; Гуров, Юрий Борисович; Леонова, Татьяна Игоревна© 2020 Published under licence by IOP Publishing Ltd.Formation of the 7He heavy isotope was studied in the reactions of stopped pion absorption by light nuclei 9Be, 10,11B and 12,14C. Measurements were performed using the two-arm multilayer semiconductor spectrometer. Contrary to the results of other studies, we observed several narrow highly excited states (Ex > 16 MeV) of 7He. From the analysis of the continuous excitation spectrum in reactions 9Be(π-, d)X and 11B(π-, dd)X it was obtained first indication that the 4He+3n structure is not present in the ground state of 7He.
- ПубликацияТолько метаданныеPossible neutron and proton halo structure in the isobaric analog states of A=12 nuclei(2020) Demyanova, A. S.; Starastsin, V. I.; Danilov, A. N.; Ogloblin, A. A.; Gurov, G. P.; Гуров, Юрий Борисович© 2020 American Physical Society.The differential cross sections of the B11(He3,d)C12 reaction leading to formation of the 0+ ground state and the 15.11-MeV 1 +, 16.57-MeV 2-, and 17.23-MeV 1- excited states of C12 are measured at Elab=25 MeV. The analysis of the data is carried out within the coupled-reaction-channels method for the direct proton transfer to the bound and unbound states. The rms radii of the last proton in all states studied are determined. A comparison of the rms radii of the B12, C12, and N12 nuclei in the isobaric analog states (IASs) with isospin T=1 determined by different methods allows us to arrive at a conclusion that these nuclei in the 1- excited states at Ex=2.62, 17.23, and 1.80 MeV, respectively, possess one-nucleon (neutron or proton) halo structure. The enlarged radii and a large probability of the last neutron to be outside of the range of the interaction potential are also found for the 2- states of B12, C12, and N12 at Ex=1.67, 16.57, and 1.19 MeV, respectively. These IASs also can be regarded as candidates for states with one-nucleon (neutron or proton) halo.
- ПубликацияТолько метаданныеHalo-like structure in 7He nucleus(2020) Demyanova, A. S.; Ogloblin, A. A.; Goncharov, S. A.; Belyaeva, T. L.; Chernyshev, B. A.; Gurov, G. P.; Lapushkin, S. V.; Чернышев, Борис Андреевич; Гуров, Юрий Борисович
- ПубликацияОткрытый доступIsospin triplet A=12: search for states with enhanced radii(2020) Demyanova, A. S.; Danilov, A. N.; Ogloblin, A. A.; Starastsin, V. I.; Gurov, Y. B.; Гуров, Юрий БорисовичTwo independent methods: Asymptotic Normalization Coefficients (ANC) and Modified Diffraction Model (MDM) were applied to new and existing experimental data to search for states with enhanced radii in isobaric analogue states (IAS) of B-12 and N-12. The ANC analysis of the B-11(d,p) B-12 reaction at E-d = 21.5 MeV has confirmed neutron halo existence for two states of B-12: 2(-), 1.67 MeV and 1(-), 2.62 MeV [1] Some new results were obtained for higher excited states: halo-like states were observed for 0(+), 2.72 MeV and 3(-), 3.39 MeV states. It should be mentioned that the last one is unbound state, which is 19 keV above the neutron emission threshold and in both states last neutron has a non-zero orbital momentum (1(n) =1 and 1(n) =2, correspondingly). We propose to use MDM to study isobaric analogue states of B-12 in the mirror N-12 nucleus and apply it to analyze the (He-3,t) reaction data. The existing in the literature data are not completed enough to make definite conclusion about halo in the 2(-) and 1(-) states of N-12. This fact simulated us to carry out a new experiment on the C-12(He-3,t) N-12 reaction at the end of 2018. The measurements were conducted at the University of Jyvaskyla (Finland) using the K130 cyclotron to produce a He-3 beam at E(He-3)=40 MeV. The differential cross sections of the C-12(He-3,t)N-12 reaction were measured in the c.m. angular range 8 degrees-70 degrees. Preliminary results for angular distributions are obtained. MDM analysis of preliminary (He-3,t) experimental data is done.