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Title: Ultrahigh-spin spectroscopy of {sup 159,160}Er: Observation of triaxial strongly deformed structures

Abstract

Three weakly populated high-spin rotational bands associated with the {gamma} decay of {sup 159}Er and {sup 160}Er were observed in fusion-evaporation reactions involving a beam of {sup 48}Ca at an energy of 215 MeV incident on a {sup 116}Cd target. The {gamma} decays were detected using the highly efficient Gammasphere spectrometer. The discovery of these bands, which extend discrete-line spectroscopy in these nuclei to ultrahigh spin of {approx}60({Dirac_h}/2{pi}), is consistent with recent observations of high-spin collective structures in isotopes of Er, Yb, and Tm around N=90. Cranked Nilsson-Strutinsky calculations suggest that these bands may arise from well-deformed triaxial configurations with either positive or negative {gamma} deformation.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. STFC Daresbury Laboratory, Daresbury, Warrington WA4 4AD (United Kingdom)
Publication Date:
OSTI Identifier:
21296587
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 80; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.80.064322; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BEAMS; CADMIUM 116 TARGET; CALCIUM 48; DEFORMED NUCLEI; ERBIUM 159; ERBIUM 160; EVAPORATION; GAMMA DECAY; HEAVY ION FUSION REACTIONS; HIGH SPIN STATES; MEV RANGE 100-1000; ROTATIONAL STATES; SPECTROMETERS; SPECTROSCOPY; SPIN; THULIUM ISOTOPES; YTTERBIUM ISOTOPES

Citation Formats

Ollier, J, Simpson, J, Wang, X, Riley, M A, Aguilar, A, Teal, C, Paul, E S, Nolan, P J, Petri, M, Rigby, S V, Thomson, J, Unsworth, C, Carpenter, M P, Janssens, R V. F., Kondev, F G, Lauritsen, T, Zhu, S, Hartley, D J, Darby, I G, Ragnarsson, I, Department of Physics, Florida State University, Tallahassee, Florida 32306, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, Nuclear Engineering Division and Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, Department of Physics, U. S. Naval Academy, Annapolis, Maryland 21402, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, and Division of Mathematical Physics, LTH, Lund University, Post Office Box 118, S-22100 Lund. Ultrahigh-spin spectroscopy of {sup 159,160}Er: Observation of triaxial strongly deformed structures. United States: N. p., 2009. Web. doi:10.1103/PHYSREVC.80.064322.
Ollier, J, Simpson, J, Wang, X, Riley, M A, Aguilar, A, Teal, C, Paul, E S, Nolan, P J, Petri, M, Rigby, S V, Thomson, J, Unsworth, C, Carpenter, M P, Janssens, R V. F., Kondev, F G, Lauritsen, T, Zhu, S, Hartley, D J, Darby, I G, Ragnarsson, I, Department of Physics, Florida State University, Tallahassee, Florida 32306, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, Nuclear Engineering Division and Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, Department of Physics, U. S. Naval Academy, Annapolis, Maryland 21402, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, & Division of Mathematical Physics, LTH, Lund University, Post Office Box 118, S-22100 Lund. Ultrahigh-spin spectroscopy of {sup 159,160}Er: Observation of triaxial strongly deformed structures. United States. https://doi.org/10.1103/PHYSREVC.80.064322
Ollier, J, Simpson, J, Wang, X, Riley, M A, Aguilar, A, Teal, C, Paul, E S, Nolan, P J, Petri, M, Rigby, S V, Thomson, J, Unsworth, C, Carpenter, M P, Janssens, R V. F., Kondev, F G, Lauritsen, T, Zhu, S, Hartley, D J, Darby, I G, Ragnarsson, I, Department of Physics, Florida State University, Tallahassee, Florida 32306, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, Nuclear Engineering Division and Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, Department of Physics, U. S. Naval Academy, Annapolis, Maryland 21402, Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, and Division of Mathematical Physics, LTH, Lund University, Post Office Box 118, S-22100 Lund. Tue . "Ultrahigh-spin spectroscopy of {sup 159,160}Er: Observation of triaxial strongly deformed structures". United States. https://doi.org/10.1103/PHYSREVC.80.064322.
@article{osti_21296587,
title = {Ultrahigh-spin spectroscopy of {sup 159,160}Er: Observation of triaxial strongly deformed structures},
author = {Ollier, J and Simpson, J and Wang, X and Riley, M A and Aguilar, A and Teal, C and Paul, E S and Nolan, P J and Petri, M and Rigby, S V and Thomson, J and Unsworth, C and Carpenter, M P and Janssens, R V. F. and Kondev, F G and Lauritsen, T and Zhu, S and Hartley, D J and Darby, I G and Ragnarsson, I and Department of Physics, Florida State University, Tallahassee, Florida 32306 and Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE and Nuclear Engineering Division and Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 and Department of Physics, U. S. Naval Academy, Annapolis, Maryland 21402 and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 and Division of Mathematical Physics, LTH, Lund University, Post Office Box 118, S-22100 Lund},
abstractNote = {Three weakly populated high-spin rotational bands associated with the {gamma} decay of {sup 159}Er and {sup 160}Er were observed in fusion-evaporation reactions involving a beam of {sup 48}Ca at an energy of 215 MeV incident on a {sup 116}Cd target. The {gamma} decays were detected using the highly efficient Gammasphere spectrometer. The discovery of these bands, which extend discrete-line spectroscopy in these nuclei to ultrahigh spin of {approx}60({Dirac_h}/2{pi}), is consistent with recent observations of high-spin collective structures in isotopes of Er, Yb, and Tm around N=90. Cranked Nilsson-Strutinsky calculations suggest that these bands may arise from well-deformed triaxial configurations with either positive or negative {gamma} deformation.},
doi = {10.1103/PHYSREVC.80.064322},
url = {https://www.osti.gov/biblio/21296587}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 6,
volume = 80,
place = {United States},
year = {2009},
month = {12}
}