Physics of Particles and Nuclei Letters最新文献

{"title":"An Algorithm for Matching the Amplitude of the Accelerating Voltage and the Rate of Growth of the Magnetic Field","authors":"O. I. Brovko,&nbsp;A. A. Volodin,&nbsp;F. N. Ganyushkin,&nbsp;V. A. Lebedev,&nbsp;E. M. Syresin","doi":"10.1134/S1547477124702534","DOIUrl":"10.1134/S1547477124702534","url":null,"abstract":"<p>The preparation of the NICA injection complex for injection into the collider requires an increase in the beam intensity at the Nuclotron exit. Important part of the program to increase intensityis a reduction of beam loss in the course of beam acceleration. This approach requires an optimization of many systems of the facility, and, in particular, of operation of the RF systems. Experience gained in the course of four commissioning runs enables choosing major directions for further optimization of RF systems operation. The measurement showed that the beam losses observed at the beginning of accelerating cycle, in both Booster and Nuclotron, are related to the mismatch between the magnetic field growth rate and capabilities of existing RF systems. Ways to achieve the required matching and the corresponding loss in the accelerating rate are discussed.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 2","pages":"423 - 431"},"PeriodicalIF":0.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Possible Experiments to Search for the Singlet Deuteron and the Problem of the Existence of Neutral Nuclei","authors":"S. B. Borzakov","doi":"10.1134/S1547477124702236","DOIUrl":"10.1134/S1547477124702236","url":null,"abstract":"<p>The existence of the dineutron was predicted 75 years ago. At present, a number of experimental works confirm this assumption. By virtue of the principle of isotopic invariance, a singlet deuteron must also exist. The possibility of describing the neutron-proton interaction in the state at low energies as the excitation of a quasi-stationary level lying below the deuteron (singlet deuteron) decay threshold is discussed. The position, neutron and radiative widths of the level are determined by the scattering length, the effective radius, and the cross section for the radiative capture of neutrons by protons. Experiments to search for this level are discussed. In accordance to the principle of isotopic invariance the discovery of the singlet deuteron would be confirmation of the existence of the dineutron.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 2","pages":"268 - 271"},"PeriodicalIF":0.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Neutron Spectrum Unfolding Method Based on Shifted Legendre Polynomials, Its Application to the IREN Facility","authors":"K. Chizhov,&nbsp;L. Beskrovnaya,&nbsp;A. Chizhov","doi":"10.1134/S154747712470239X","DOIUrl":"10.1134/S154747712470239X","url":null,"abstract":"<p>The paper presents a method for unfolding the neutron energy spectrum from the results of measurements with a Bonner multi-sphere spectrometer. The method is based on solving the system of the Fredholm integral equation of the 1st kind using the Tikhonov regularization and decomposing the spectrum into shifted Legendre polynomials. To obtain an optimal solution, an algorithm for selecting the regularization parameter and the number of polynomials is proposed. Spectra were reconstructed for rooms near the Intense Resonance Neutron Source (IREN) facility at JINR in the energy range from <span>({{10}^{{ - 8}}})</span> to 63.1 MeV. The effective dose rate and ambient dose equivalent rate were estimated for the obtained spectra. Results are compared with the statistical regularization method (the ”Reconst” software).</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 2","pages":"337 - 340"},"PeriodicalIF":0.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation of the ROT-Effect Using GEANT4","authors":"M. Yu. Kopatch,&nbsp;Yu. N. Kopatch,&nbsp;V. L. Kuznetsov","doi":"10.1134/S1547477124702418","DOIUrl":"10.1134/S1547477124702418","url":null,"abstract":"<p>This work represents the results of modeling the ROT effect using the Monte Carlo method and the GEANT4 toolkit [1]. The influence of the geometry of the experimental setup, target parameters, and other factors on the magnitude of the observed asymmetry was studied. Particular attention is paid to assessing the possibility of measuring the ROT effect by determining the fission axis using the detection of prompt fission neutrons.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 2","pages":"345 - 348"},"PeriodicalIF":0.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Use of Frozen Beads of a Mixture of Mesitylene and Meta-Xylene with Properties of Rupert’s Drops in Cryogenic Neutron Moderators","authors":"A. V. Galushko,&nbsp;R. V. Chepurchenko,&nbsp;M. V. Bulavin,&nbsp;I. L. Litvak,&nbsp;K. A. Mukhin,&nbsp;V. A. Skuratov","doi":"10.1134/S1547477124702571","DOIUrl":"10.1134/S1547477124702571","url":null,"abstract":"<p>Feasibility of using frozen Rupert’s drops–solid frozen beads made from a mixture of aromatic hydrocarbons with high strength properties–in bead cryogenic neutron moderators is experimentally studied. It is shown that if a new modification of the dosing device with a high discharge rate (~6 pcs/s) and standard parameters of pneumatic transportation is used, solid frozen beads made from mesitylene and meta-xylen can be loaded into the chamber of a cryogenic moderator five times faster without being destroyed during transportation.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 2","pages":"456 - 462"},"PeriodicalIF":0.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of Neutron Storage Time in Closed Chamber of the UCN Source for PIK Reactor","authors":"V. A. Lyamkin,&nbsp;A. P. Serebrov,&nbsp;D. V. Prudnikov,&nbsp;A. O. Koptyuhov,&nbsp;A. V. Sirotin,&nbsp;G. O. Borodinov,&nbsp;A. A. Nedolyak,&nbsp;P. A. Khazov","doi":"10.1134/S1547477124702315","DOIUrl":"10.1134/S1547477124702315","url":null,"abstract":"<p>In 2020, a Federal Program for creating experimental facilities for the PIK reactor was started. One of the main facilities to be constructed within this Program is a new superfluid helium-based UCN source for fundamental physics research. The projected UCN density in the closed source vessel is going to be 2.1 × 10³ cm^–3. Work has been carried out for increasing UCN density in the source vessel by increasing neutron lifetime in superfluid helium. More than 40 m³ of isotopically pure helium-4 with a helium-3 content below 10^–11 was produced to virtually eliminate the possibility of neutron absorption. Cryogenic cycle was optimised to obtain minimum helium temperature in the chamber. Work is underway to assemble the entire complex for cryogenic system testing and confirm the operating parameters of the facility.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 2","pages":"304 - 307"},"PeriodicalIF":0.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Crystal Structure and Magnetic Properties of BiMn1 – xFexO3 (x ≤ 0.4) Solid Solution","authors":"D. V. Karpinsky,&nbsp;S. I. Latushko,&nbsp;D. V. Zheludkevich,&nbsp;V. V. Sikolenko,&nbsp;M. V. Silibin","doi":"10.1134/S1547477124702583","DOIUrl":"10.1134/S1547477124702583","url":null,"abstract":"<p>The crystal structure and magnetic properties of BiMn_1–<i>x</i>Fe_<i>x</i>O₃ (<i>x</i> ≤ 0.4) solid solutions obtained by solid-phase reactions under high pressure have been studied by neutron and X-ray diffraction and magnetometry methods. The substitution of manganese ions with iron ions is shown to lead to a concentration phase transition from a monoclinic (<i>C</i>2<i>/c</i> space group) to an orthorhombic (<i>Pnma</i> space group) structure; the region of the two-phase structural state corresponds to the concentration range 0.2 ≤ <i>x</i> ≤ 0.4. Solid solutions with chemical compositions corresponding to the morphotropic phase boundary are characterized by the absence of long-range magnetic ordering, while at temperatures below ~80 K spontaneous magnetization is observed, reaching ~10–20 electromagnetic units/g at <i>T</i> = 5 K. The nature of the ferromagnetic component of the magnetic structure in compositions with a two-phase structural state is discussed along with the relationship between the structural state of solid solutions in the region of the morphotropic phase boundary and their magnetic properties.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 2","pages":"463 - 467"},"PeriodicalIF":0.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fast Trigger Unit for Experiments with the Extracted Nuclear Beam of Nuclotron","authors":"P. N. Grigoryev,&nbsp;N. A. Lashmanov,&nbsp;V. Yu. Rogov,&nbsp;S. A. Sedykh,&nbsp;S. V. Sergeev,&nbsp;V. I. Yurevich","doi":"10.1134/S1547477124702509","DOIUrl":"10.1134/S1547477124702509","url":null,"abstract":"<p>The basic principles of the architecture and construction of the electronic module for generating a zero-level trigger signal in the BM@N and SRC experiments on a fixed target with the extracted nuclear beam of the JINR Nuclotron are described. The trigger generation logic, including delay lines, is implemented on the Cyclone V FPGA. The system of control and monitoring programs is discussed.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 2","pages":"397 - 405"},"PeriodicalIF":0.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Non-Destructive Study of Fragment of Greaves (4th Century BCE) Using Neutron Resonance Capture Analysis","authors":"N. V. Simbirtseva,&nbsp;S. T. Mazhen,&nbsp;A. M. Yergashov,&nbsp;P. V. Sedyshev,&nbsp;I. A. Saprykina","doi":"10.1134/S1547477124702376","DOIUrl":"10.1134/S1547477124702376","url":null,"abstract":"<p>Neutron resonance capture analysis has been applied to determine the elemental composition of an archaeological object provided by the Institute of Archeology of the Russian Academy of Sciences. This artifact is a fragment of ancient greaves. The experiment was carried out at the intense resonance neutron Source located in the Frank Laboratory of Neutron Physics in Dubna (Russia). The method is non-destructive and does not require any sample preparation. The result of the study of element composition of the fragment of greaves is presented in this paper.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 2","pages":"329 - 332"},"PeriodicalIF":0.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Measurement of Cross-Section of the p + 7Li, d + Li, p + 11B, and d + B Reactions at the Ion Energies up to 2.2 MeV","authors":"M. Bikchurina,&nbsp;T. Bykov,&nbsp;D. Kasatov,&nbsp;Ya. Kolesnikov,&nbsp;A. Koshkarev,&nbsp;G. Ostreinov,&nbsp;S. Savinov,&nbsp;A. Shuklina,&nbsp;E. Sokolova,&nbsp;S. Taskaev","doi":"10.1134/S1547477124702224","DOIUrl":"10.1134/S1547477124702224","url":null,"abstract":"<p>The interaction of a proton beam with lithium is considered the best reaction for boron neutron capture therapy. The interaction of a deuteron beam with lithium is characterized by a high yield of neutrons, high energy of neutrons, and a large variety of reactions. The interaction of a proton with boron-11 is considered a promising reaction for aneutronic fusion. The reliable data for the reactions cross-sections are important for many applications, including radiation astrophysics, aneutronic fusion, hadron therapy, boron neutron capture therapy, testing of advanced materials and equipment. The experimental data on the cross-sections differ greatly from one author to another; for a number of reactions there are no data on the cross-section in the databases. Measurements of the reactions cross-sections were carried out at the accelerator-based neutron source VITA at Budker Institute of Nuclear Physics (Novosibirsk, Russia), using a HPGe γ-spectrometers, an α-spectrometers, and a diamond neutron spectrometers. The ⁷Li(<i>p</i>, <i>p</i>'γ)⁷Li, ⁷Li(<i>p</i>, α)⁴He, ⁶Li(<i>d</i>, α)⁴He, ⁶Li(<i>d</i>, <i>p</i>)⁷Li, ⁶Li(<i>d</i>, <i>p</i>)⁷Li*, ⁷Li(<i>d</i>, α)⁵He, ⁷Li(<i>d</i>, <i>n</i>α)⁴He, ⁷Li(<i>d</i>, <i>n</i>)⁸Be, ¹¹B(<i>p</i>, α₀)⁸Be, ¹¹B(<i>p</i>, α₁)⁸Be*, ¹⁰B(<i>d</i>, α)⁸Be, ¹⁰B(<i>d</i>, <i>p</i>)¹¹B, ¹¹B(<i>d</i>, α)⁹Be, and ¹¹B(<i>d</i>, <i>p</i>)¹²B reactions cross-sections at the ion energies up to 2.2 MeV have been measured. Measurements of the differential cross sections of the reactions were carried out for two angles which made it possible to determine the angular distribution of emission of the reaction products and calculate the total reactions cross sections. The results obtained are distinguished by their reliability.</p>","PeriodicalId":730,"journal":{"name":"Physics of Particles and Nuclei Letters","volume":"22 2","pages":"264 - 267"},"PeriodicalIF":0.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143944343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}