Optically Active Defects Induced by 10 MeV Electron Beam in Transparent MgAl2O4 Ceramics

In the synthesized MgAl2O4 ceramics, Raman scattering modes were detected due to the presence of random distribution of cations over structural positions (structural reversal effects). Irradiation by 10 MeV electron beam caused intensity redistribution of the fundamental bands in Raman spectrum. New optical absorption bands were registered. Observed features were attributed to the effect of radiation-induced ‘ionic mixing’ in cation sublattice. This effect is the formation of additional [Al

Charm production nearby threshold in pA-interactions at 70 GeV

The results of the SERP-E-184 experiment at the U-70 accelerator (IHEP, Protvino) are presented. Interactions of the 70 GeV proton beam with C, Si and Pb targets were studied to detect decays of charmed $D^0$, $\overline D^0$, $D^+$, $D^-$ mesons and $\Lambda _c^+$ baryon near their production threshold. Measurements of lifetimes and masses are shown a good agreement with PDG data. The inclusive cross sections of charm production and their A-dependencies were obtained. The yields of these particles are compared with the theoretical predictions and the data of other experiments. The measured cross section of the total open charm production ($\sigma _{\mathrm {tot}}(c\overline c)$ = 7.1 $\pm$ 2.3(stat) $\pm$1.4(syst) $\mu$b/nucleon) at the collision c.m. energy $\sqrt {s}$ = 11.8 GeV is well above the QCD model predictions. The contributions of different species of charmed particles to the total cross section of the open charm production in proton-nucleus interactions vary with energy.Comment: 4 pages, 6 pages, 38th International Conference on High Energy Physics 3-10 August 2016, Chicago, US

Observation of narrow baryon resonance decaying into pKs0pK^0_s in pA-interactions at 70GeV/c70 GeV/c with SVD-2 setup

SVD-2 experiment data have been analyzed to search for an exotic baryon state, the $\Theta^+$-baryon, in a $pK^0_s$ decay mode at $70 GeV/c$ on IHEP accelerator. The reaction $pA \to pK^0_s+X$ with a limited multiplicity was used in the analysis. The $pK^0_s$ invariant mass spectrum shows a resonant structure with $M=1526\pm3(stat.)\pm 3(syst.) MeV/c^2$ and $\Gamma < 24 MeV/c^2$. The statistical significance of this peak was estimated to be of $5.6 \sigma$. The mass and width of the resonance is compatible with the recently reported $\Theta^+$- baryon with positive strangeness which was predicted as an exotic pentaquark ($uudd\bar{s}$) baryon state. The total cross section for $\Theta^+$ production in pN-interactions for $X_F\ge 0$ was estimated to be $(30\div120) \mu b$ and no essential deviation from A-dependence for inelastic events $(\sim A^{0.7})$ was found.Comment: 8 pages, 7 figures, To be submitted to Yadernaya Fizika. v3-v5 - Some references added, minor typos correcte

Thin-Film Coatings of Mg-Al Spinel on Dielectric Substrates: Synthesis, Structure and Lattice Dynamics

Thin-film coatings based on Mg-Al spinel possess high thermal, chemical and radiation durability. Thus, they make it perspective for nano- and optoelectronic applications, where those factors are critical.Работа выполнена в рамках Госзадания ИГГ УрО РАН (№АААА-А18-118053090045-8) с использованием оборудования ЦКП "Геоаналитик", дооснащение которого поддержано грантом Минобрнауки РФ (№075-15-2021-680). Получение тонкопленочных покрытий выполнено в рамках грантов РНФ № 21-12-00392, РФФИ № 20-42-660012 и госзадания 2020-0059

Challenges in QCD matter physics - The Compressed Baryonic Matter experiment at FAIR

Substantial experimental and theoretical efforts worldwide are devoted to explore the phase diagram of strongly interacting matter. At LHC and top RHIC energies, QCD matter is studied at very high temperatures and nearly vanishing net-baryon densities. There is evidence that a Quark-Gluon-Plasma (QGP) was created at experiments at RHIC and LHC. The transition from the QGP back to the hadron gas is found to be a smooth cross over. For larger net-baryon densities and lower temperatures, it is expected that the QCD phase diagram exhibits a rich structure, such as a first-order phase transition between hadronic and partonic matter which terminates in a critical point, or exotic phases like quarkyonic matter. The discovery of these landmarks would be a breakthrough in our understanding of the strong interaction and is therefore in the focus of various high-energy heavy-ion research programs. The Compressed Baryonic Matter (CBM) experiment at FAIR will play a unique role in the exploration of the QCD phase diagram in the region of high net-baryon densities, because it is designed to run at unprecedented interaction rates. High-rate operation is the key prerequisite for high-precision measurements of multi-differential observables and of rare diagnostic probes which are sensitive to the dense phase of the nuclear fireball. The goal of the CBM experiment at SIS100 (sqrt(s_NN) = 2.7 - 4.9 GeV) is to discover fundamental properties of QCD matter: the phase structure at large baryon-chemical potentials (mu_B > 500 MeV), effects of chiral symmetry, and the equation-of-state at high density as it is expected to occur in the core of neutron stars. In this article, we review the motivation for and the physics programme of CBM, including activities before the start of data taking in 2022, in the context of the worldwide efforts to explore high-density QCD matter.Comment: 15 pages, 11 figures. Published in European Physical Journal

Клинический случай трансплантации сердца пациенту с саркомой сердца

Primary cardiac sarcoma is a rapidly progressive, aggressive cardiac tumor that is very rare in the general population. Conservative treatment for this tumor is not very effective. The only effective treatment is radical surgical removal of the malignancy. However, if sarcoma removal cannot be performed, heart transplantation (HT) becomes the only treatment option. The median survival of heart recipients with preoperative cardiac sarcoma is 8.5 months. Globally, such operations are performed in a small number of cases. This paper presents the first experience of HT for a patient with primary cardiac sarcoma in the Russian Federation.Первичная саркома сердца – быстропрогрессирующая агрессивная опухоль сердца, встречающаяся весьма редко в общей популяции. Консервативное лечение данной опухоли не имеет высокой эффективности. Единственным эффективным методом лечения является радикальное хирургическое удаление злокачественного новообразования, однако при невозможности выполнения удаления саркомы единственным возможным методом лечения является трансплантация сердца. Медиана выживаемости реципиентов сердца с предоперационным диагнозом «саркома сердца» после выполнения трансплантации сердца составляет 8,5 месяца. Во всем мире такие операции выполняются в небольшом количестве. В статье представлен первый опыт трансплантации сердца пациенту с первичной саркомой сердца на территории Российской Федерации