This paper shows the results from the experiment that was done in JINR (Joint Institute for Nuclear Research) Dubna. Thorium foil between two aluminum foils was irradiated inside Phasotron with 100 MeV protons. As a result - gamma spectra was obtained from the Th and aluminum foils and residual nuclei cross-sections were evaluated from the reaction. Also there was made a simulation analysis of the beam distribution inside the Th foil and particle escape from the target. The experimental cross-sections were compared with calculations made in Monte-Carlo simulation (MCNP 6.1).

A new rigorously based approach to constructing decay schemes based on gamma-gamma-coincidence data is described.

Levels of the149Pm nucleus populated in the149Nd decay were studied by using the low-temperature nuclear orientation technique. The parent149Nd nuclei were oriented in a gadolinium host. The normalized γ-ray intensities were determined for twenty seven transitions in the daughter149Pm nucleus. The characteristics of149Pm levels at 288·2 and 425·3 keV were determined as 9/2+ and 7/2+, respectively, and the previous spin-assignments could be unambiguously confirmed for several other levels in149Pm. The substantial new information on multipole mixing ratios of γ-rays in149Pm is presented. The quasiparticle-rotor model was applied to the description of the structure of the low-lying levels in149Pm.

The hyperfine magnetic fields for181Ta in the cubic (C 15) Laves phases LuFe2 and GdFe2 have been measured by the TDPAC method. At 300 K, Bhf=−20.5(4) T for LuFe2 and +19.0(5) T and +10.2(4) T for the samples of GdFe2, prepared at normal and high (7.7 GPa) pressure, have been obtained. Temperature dependence of these fields in the range 77–900 K has been also measured.

The hyperfine magnetic fields for181Ta in the cubic (C 15) Laves phases LuFe2 and GdFe2 have been measured by the TDPAC method. At 300 K, Bhf=−20.5(4) T for LuFe2 and +19.0(5) T and +10.2(4) T for the samples of GdFe2, prepared at normal and high (7.7 GPa) pressure, have been obtained. Temperature dependence of these fields in the range 77–900 K has been also measured.

The Spin-2 facility built at YASNAPP-2 experimental complex of the Joint Institute of Nuclear Research is described. The basic parameters of SPIN-2 and YASNAPP-2 are discussed.

Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation K. Ya. Gromov, V. G. Kalinnikov, V. M. Tsupko‐Sitnikov; ISOL—facility YASNAPP‐2. AIP Conf. Proc. 10 December 1987; 164 (1): 853–856. https://doi.org/10.1063/1.37051 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAIP Publishing PortfolioAIP Conference Proceedings Search Advanced Search |Citation Search

Hyperfine magnetic fields for such probes as:152SmFe,152SmCo,152SmNi,155GdFe,172YbFe,172YbCo and172YbNi have been measured using PAC method. The quantitative analysis of components of these fields has been also performed.

Low temperature nuclear orientation of radioactive nuclei of the Eu, Gd, Tb, Yb, Lu, Bi, At and Np isotopes was performed. Some results on corresponding daughter nuclei are presented which are compared with theoretical predictions. Recent results obtained by the NMR/ON experiments are also given. Progress in realization of nuclear orientation system on‐line to mass‐separator and the new 680 MeV JINR proton phasotron is described.

We have investigated the angular distribution of el rays accompanying decay of WZYb nuclei oriented at low temperatures in gadolinium and iron. The sample of WZYbGd was obtained from decay of WZLuGd prepared by implantation and melting. The measured anisotropies of the el rays from decay of WZYbGd turned out to be small, indicating that the electric quadrupole interaction for Yb in Gd is comparable with the magnetic dipole interaction. The parameters of the mixing of multipolarities E2/M1 and M2/E1 have been determined for seven transitions of WZTm on the basis of measured values of the anisotropy of el rays from decay of WZYbFe.

Nuclear orientation measurements at low temperatures have been carried out on radioactive isotopes of154Eu and169Yb in Fe and of166Tm and169Yb in Gd. Gamma-rays from169YbGd, obtained by the decay of implanted and melted sample of169IuGd, were observed to have smaller anisotropies of opposite signs compared with those from169YbFe. This may indicate that for Yb polarized in Gd electric quadrupole interaction is comparable with magnetic dipole one. Mixing ratios of the transitions in154Gd,166Er and169Tm have been made for two levels in166Er. Our analysis showed that the 3− to 3+ beta decay to the 1128 keV level in154Gd has 65(20)% Δjβ=0.