Elsevier

Nuclear Physics A

Volume 425, Issue 2, 27 August 1984, Pages 317-344
Nuclear Physics A

New positive-parity states and the shell-model description of 111Sn

https://doi.org/10.1016/0375-9474(84)90078-2Get rights and content

Abstract

The excited states in 111Sn have been studied by means of three different reactions using inbeam spectroscopic methods. Energies and intensities of γ-rays have been determined via the (α, n), (3He, 3n) and (6Li, 4n) reactions. Coincidences, angular and time distributions have been measured in the (α, n) and (3He, 3n) reactions. Conversion-electron spectra have been recorded in the (α, n) reaction. As a result, 9 levels of even parity have been identified with spin values between 92 and (172) and excitation energies up to 2.5 MeV, and three additional odd-parity states have been established up to Ex < 3307 keV. Besides the 112 isomer, three further levels with ns lifetimes were found. The experimental data are compared with shell-model predictions. The hamiltonian parameters have been determined in a fit to 22 known levels of 111,112,113Sn. In the case of even-parity states a remarkable agreement between experiment and theory can be stated. For the description of odd-parity states a particle-core-coupling model is succesfully applied.

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    Permanent address: Institute for Nuclear Research and Nuclear Energy, B-1113 Sofia, Bulgaria.

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