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1.
We consider a method of detecting the ionizing component of solar cosmic rays (SCRs) with energy from tens of MeV to tens of GeV by measuring the energy loss of SCR protons and light nuclei in scintillators and the multiplicity of the local neutron generation in a converter. Scintillation detectors based on stilbene, lithium glass, and solid-state photomultiplier tubes are capable of detecting fast neutrons with a temporal resolution of 10 ns and rejecting the gamma-ray background in the measuring system. The method will allow investigating the nucleon components of primary SCRs in circumterrestrial space.  相似文献   
2.
An interaction potential with a radial dependence in the Woods-Saxon form is used to describe low energy neutron data in the context of the coupled channel optical model. A single value of the diffuseness parameter was used for even-even nuclides over a wide range of A: a = 0.65 fm. Traditional and nontraditional magic and nonspherical nuclei were exceptions. The deviations can be used to find or verify the existence of nontraditional magic numbers.  相似文献   
3.
A setup installed on the RADEX neutron beam channel (Institute for Nuclear Research, Russian Academy of Sciences) and designed to study quasi-free nn scattering in the n + d → p + n + n reaction is described. The setup is a two-arm time-of-flight spectrometer composed of scintillation neutron hodoscope (in the left arm), a scintillation neutron detector (in the right arm), and an active scintillation deuterated target for detecting protons. Secondary neutrons are detected at angles corresponding to the kinematic conditions of quasi-free nn scattering. Events are selected at low energies of the outgoing proton spectator. It is shown that data on neutron-neutron quasi-free scattering can be obtained in a wide range of primary-neutron energies.  相似文献   
4.
5.
Physics of Atomic Nuclei - The $${}^{1}S_{0}$$ neutron–neutron ( $$nn$$ ) scattering length was measured in the neutron–deuteron ( $$nd$$ ) breakup reaction at an energy of 60 MeV. The...  相似文献   
6.
The analysis of new experimental data, obtained at the Proton Linear Accelerator of INR, with the aim to search for supernarrow dibaryons in the pdppX 1 and pdpdX 2 reactions is presented. Narrow peaks with an experimental width of 5 MeV at masses of 1904±2, 1926±2, and 1942±2 MeV have been observed in missing mass M pX1 spectra. In the missing mass M X1 spectra, the peaks at M X1 = 966±2, 986±2, and 1003±2 MeV have been found. The analysis of the data obtained leads to the conclusion that the observed peaks in M pX1 spectra are most likely supernarrow dibaryons, the decay of which into two nucleons is forbidden by the Pauli exclusion principle. An alternative interpretation of the spectra by assuming a decay of the supernarrow dibaryons in “exotic baryon states” with masses M X1 is discussed. Received: 22 October 2001 / Accepted: 15 November 2001  相似文献   
7.
The great disagreement between theory and experiment observed in nd and pd interactions indicates that investigations of mechanisms for various processes in few-nucleon systems should be continued. It is planned to investigate the reactions d + 3H → 3He + (nn) and 3He + d → 3H + (pp) in order to study nn and pp correlations in 3He and 3H nuclei. Test measurements of the d + 2H → 2He + (nn) reaction, performed with the deuteron beam at the Institute of Nuclear Physics, confirm that it is methodologically possible to perform the planned experiments.  相似文献   
8.
Low-energy (0.04–3.0 MeV) neutron data for even-even 58–64Ni and 64–70Zn isotopes are analyzed in terms of the coupled channel optical model (CCOM) as a function of N p N n, where N p(N n) are the numbers of valent nucleons (particles or holes), and consider the relationship between the diffuseness parameter obtained from CCOM calculations and the value of the N p N n function. Considering the Ni and Zn isotope chains with the traditional magic number Z = 28 and the nontraditional N = 38 proves the existence of N = 28–38 subshells. The results from our analysis indicate the possible existence of the nontraditional magic nucleus 30 68 Zn38.  相似文献   
9.
The responses of two liquid scintillators to neutron irradiation are investigated. Monoenergetic neutrons are obtained in the reaction d + 2H → 3He + n in different configurations of a coincidence experiment involving the detection of both neutrons and the 3He nucleus. In the experiment, the 15 MeV deuteron beam from the U-120 accelerator at the Skobeltsyn Institute of Nuclear Physics, Moscow State University, hits a target of deuterated polyethylene, and the secondary neutrons obtained in the reaction irradiate the EJ-301 and EJ-315 liquid scintillators under study.  相似文献   
10.
Data obtained in recent years for the neutron–neutron scattering length in nd and dd breakup reactions are analyzed. Serious discrepancies between experimental data from different studies may be explained by the effect of three-nucleon forces depending on the velocity of separation of a neutron–neutron pair and a charged fragment. It is shown that the data under analysis can be approximated by a smooth curve representing the dependence of the scattering length on the parameter R, which determines the fragment-separation distance after a fixed time. This dependence makes it possible to obtain the scatteringlength value for R→∞—that is, in the absence of the effect of three-nucleon forces.  相似文献   
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