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Title: Structure changes in {sup 160}Er from low to ultrahigh spin.

Abstract

A spectroscopic investigation of the {gamma} decays from excited states in {sup 160}Er has been performed in order to study the changing structural properties exhibited from low spin up toward ultrahigh spin (I{approx}60{h_bar}). The nucleus {sup 160}Er was populated by the reaction {sup 116}Cd({sup 48}Ca,4n{gamma}) at a beam energy of 215 MeV, and resulting {gamma} decays were studied using the Gammasphere spectrometer. New rotational structures and extensions to existing bands were observed, revealing a diverse range of quasiparticle configurations, which are discussed in terms of the cranked shell model. At spins around 50{h_bar} there is evidence for oblate states close to the yrast line. Three rotational bands that have the characteristics of strongly deformed triaxial structures are observed, marking a return to collectivity at even higher spin. The high-spin data are interpreted within the framework of cranked Nilsson-Strutinsky calculations.

Authors:
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  1. Nuclear Engineering Division
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); State of Florida; United Kingdom Science and Technology Facilities Council; Swedish Research Council (SRC)
OSTI Identifier:
1020668
Report Number(s):
ANL/PHY/JA-68783
Journal ID: 0556-2813; TRN: US1103758
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Phys. Rev. C
Additional Journal Information:
Journal Volume: 83; Journal Issue: 4 ; Apr. 12, 2011
Country of Publication:
United States
Language:
ENGLISH
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; EXCITED STATES; ROTATIONAL STATES; SHELL MODELS; SPIN

Citation Formats

Ollier, J, Simpson, J, Riley, M A, Paul, E S, Wang, X, Aguilar, A, Carpenter, M P, Darby, I G, Hartley, D J, Janssens, R V. F., Kondev, F G, Lauritsen, T, Nolan, P J, Petri, M, Rees, J M, Rigby, S V, Teal, C, Thomson, J, Unsworth, C, Zhu, S, Kardan, A, Ragnarsson, I, PHY), Daresbury Lab.), Florida State Univ.), Univ. of Liverpool), Univ. of Tennessee), U.S. Naval Academy), Ferdowski Univ. of Mashhad), and Lund Univ.). Structure changes in {sup 160}Er from low to ultrahigh spin.. United States: N. p., 2011. Web. doi:10.1103/PhysRevC.83.044309.
Ollier, J, Simpson, J, Riley, M A, Paul, E S, Wang, X, Aguilar, A, Carpenter, M P, Darby, I G, Hartley, D J, Janssens, R V. F., Kondev, F G, Lauritsen, T, Nolan, P J, Petri, M, Rees, J M, Rigby, S V, Teal, C, Thomson, J, Unsworth, C, Zhu, S, Kardan, A, Ragnarsson, I, PHY), Daresbury Lab.), Florida State Univ.), Univ. of Liverpool), Univ. of Tennessee), U.S. Naval Academy), Ferdowski Univ. of Mashhad), & Lund Univ.). Structure changes in {sup 160}Er from low to ultrahigh spin.. United States. https://doi.org/10.1103/PhysRevC.83.044309
Ollier, J, Simpson, J, Riley, M A, Paul, E S, Wang, X, Aguilar, A, Carpenter, M P, Darby, I G, Hartley, D J, Janssens, R V. F., Kondev, F G, Lauritsen, T, Nolan, P J, Petri, M, Rees, J M, Rigby, S V, Teal, C, Thomson, J, Unsworth, C, Zhu, S, Kardan, A, Ragnarsson, I, PHY), Daresbury Lab.), Florida State Univ.), Univ. of Liverpool), Univ. of Tennessee), U.S. Naval Academy), Ferdowski Univ. of Mashhad), and Lund Univ.). Tue . "Structure changes in {sup 160}Er from low to ultrahigh spin.". United States. https://doi.org/10.1103/PhysRevC.83.044309.
@article{osti_1020668,
title = {Structure changes in {sup 160}Er from low to ultrahigh spin.},
author = {Ollier, J and Simpson, J and Riley, M A and Paul, E S and Wang, X and Aguilar, A and Carpenter, M P and Darby, I G and Hartley, D J and Janssens, R V. F. and Kondev, F G and Lauritsen, T and Nolan, P J and Petri, M and Rees, J M and Rigby, S V and Teal, C and Thomson, J and Unsworth, C and Zhu, S and Kardan, A and Ragnarsson, I and PHY) and Daresbury Lab.) and Florida State Univ.) and Univ. of Liverpool) and Univ. of Tennessee) and U.S. Naval Academy) and Ferdowski Univ. of Mashhad) and Lund Univ.)},
abstractNote = {A spectroscopic investigation of the {gamma} decays from excited states in {sup 160}Er has been performed in order to study the changing structural properties exhibited from low spin up toward ultrahigh spin (I{approx}60{h_bar}). The nucleus {sup 160}Er was populated by the reaction {sup 116}Cd({sup 48}Ca,4n{gamma}) at a beam energy of 215 MeV, and resulting {gamma} decays were studied using the Gammasphere spectrometer. New rotational structures and extensions to existing bands were observed, revealing a diverse range of quasiparticle configurations, which are discussed in terms of the cranked shell model. At spins around 50{h_bar} there is evidence for oblate states close to the yrast line. Three rotational bands that have the characteristics of strongly deformed triaxial structures are observed, marking a return to collectivity at even higher spin. The high-spin data are interpreted within the framework of cranked Nilsson-Strutinsky calculations.},
doi = {10.1103/PhysRevC.83.044309},
url = {https://www.osti.gov/biblio/1020668}, journal = {Phys. Rev. C},
number = 4 ; Apr. 12, 2011,
volume = 83,
place = {United States},
year = {2011},
month = {4}
}