Elsevier

Nuclear Physics A

Volume 568, Issue 3, 21 February 1994, Pages 445-498
Nuclear Physics A

Nuclear structure of 192 Ir studied with direct transfer reactions

https://doi.org/10.1016/0375-9474(94)90390-5Get rights and content

Abstract

The nuclear structure of 192Ir was investigated via the 193Ir(d, t) and 191Ir(d, p) reactions, using beams of 18 and 16 MeV deuterons, respectively. The reaction products were analyzed with a magnetic spectrograph, and detected with photographic plates. The energy resolutions (FWHM) of the detected particles were typically ≅ 5.7 keV for the (d, t) and ≅ 8.9 keV for the (d, p) reactions. Spectra were recorded at a large number of angles (⩾ 15). The angular distributions of cross sections were fitted with theoretical distributions from DWBA calculations, and the spectroscopic strengths were obtained. For the (d, t) reaction, the fits to the angular distributions were performed in many cases with the sum of two l-values. Level energies, parities, spectroscopic strengths, and possible spin values were determined up to approximately 1 MeV excitation energy. Spectra were also recorded at a few select angles for the 193Ir(3He, α)192Ir and 195Pt(p, α)192Ir reactions using beams of 25.5 MeV 3He and 18 MeV protons, respectively. In order to obtain more information regarding the spins of levels in 192Ir, multidimensional scaling programs were applied to known γ-ray intensities. The method appeared to be successful, and spins were suggested for many low-lying levels. The experimental results were compared with the IBFFM and the Nilsson model. It was found that the models can only approximately reproduce the structure of 192Ir.

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