Level structure of 68 149 Er81 and high-spin isomerism in proton-richN=81, 82, 83 nuclei期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Level structure of 68 149 Er81 and high-spin isomerism in proton-richN=81, 82, 83 nuclei

Authors:	R. Broda P. J. Daly J. McNeill R. V. F. Janssens D. C. Radford

Affiliation:	1. Institute of Nuclear Physics, PL-31342, Cracow, Poland 2. Chemistry Department, Purdue University, W. Lafayette, Indiana, USA 3. Physics Department, University of Manchester, M13 9PL, UK 4. Physics Division, Argonne National Laboratory, Argonne, Illinois, USA 5. Chalk River Nuclear Laboratories, KOJ IJO, Chalk River, Ontario, Canada

Abstract:	The level structure of theN=81 nucleus¹⁴⁹Er has been studied by γ-ray spectroscopy following the reaction⁹²Mo+255 MeV⁶⁰Ni. Yrast levels in¹⁴⁹Er are established up to ~3.3 MeV, including 0.61 and 4.8 μs isomeric states. Most of the observed levels are interpreted as seniority-three states arising from the coupling of s_1/2, d_3/2 and h_11/2 neutron holes with πh ₁₁ ^2/n . Isomers identified in the reaction⁹⁶Ru+255 MeV⁵⁸Ni are tentatively assigned to¹⁵¹Yb. TheB (E2) values of high-spin isomers inZ=66?70,N=81?83 nuclei are surveyed.

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