Multi-quasiparticle states in 179Ta and structural changes in the yrast line of the odd tantalum isotopes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

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Multi-quasiparticle states in 179Ta and structural changes in the yrast line of the odd tantalum isotopes

Institution:	1. Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, India;2. Nuclear Physics Division, Saha Institute of Nuclear Physics, Kolkata, India;3. Department of Physics, Bethune College, Kolkata, India;4. Department of Physics, Visva-Bharati, Santiniketan, India;5. Department of Physics, Indian Institute of Technology, Roorkee, India;6. Amity Institute of Nuclear Science and Technology, Amity University, Noida, India;7. Department of Physics and Astrophysics, University of Delhi, New Delhi, India;8. Department of Physics, Panjab University, Chandigarh, India;9. Department of Nuclear and Atomic Physics, Tata Institute of Fundamental Research, Mumbai, India;10. Nuclear Physics Group, Inter-University Accelerator Centre, New Delhi, India;1. Private Dermatology Office/CMB Collegium Medicum Berlin, Luisenstrasse 54/55, Berlin 10117, Germany;2. Non-Melanoma Skin Cancer Unit, Department of Dermatology and Venereology, Medical University of Graz, Graz, Austria;3. Department of Dermatology, General Hospital Augsburg, Germany;1. Physics Department, Faculty of Science, Al-Azhar University, Cairo, Egypt;2. Physics Department, Faculty of Science (Girls), Al-Azhar University, Cairo, Egypt;1. Institute of Nuclear and Particle Physics, National Centre for Scientific Research “Demokritos”, Aghia Paraskevi GR-15310, Attiki, Greece;2. Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 72 Tzarigrad Road, Sofia 1784, Bulgaria;1. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA;2. Department of Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA;3. LPC Caen, ENSICAEN, Université de Caen, CNRS/IN2P3, Caen, France;4. Department of Physics, Western Michigan University, Kalamazoo, MI 49008, USA;5. Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;6. Department of Physics & Astronomy, University of Tennessee, Knoxville, TN 37996, USA;7. Institute of Modern Physics, CAS, Lanzhou 73000, China

Abstract:	High-spin states in ¹⁷⁹Ta have been studied by a variety of γ-ray spectroscopic techniques following the ¹⁷⁶Yb(⁷Li,4n) reaction. The new results independently confirm and extend the one-, three- and five- quasiparticle bands proposed previously. The more comprehensive results obtained allow firm spin assignments to be made and also the identification of rotational bands associated with the higher seniority intrinsic states. Configuration assignments follow from analysis of these rotational band properties. To explain changes in the yrast line across the chain of isotopes from ¹⁷³Ta to ¹⁷⁹Ta, multi-quasiparticle calculations have been performed and compared with experiment. The calculations, which treat pairing correlations using the Lipkin-Nogami approach and include blocking, incorporate single-particle energies adjusted to reproduce the observed one-quasiparticle bandheads. Properties specific to ¹⁷⁹Ta include evidence for configuration mixing in the $212^{−}$ isomer configuration. Its decay is one of several anomalously fast K-hindered transitions observed and discussed in terms of configuration changes and other mechanisms.

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