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Title: High-spin structure in {sup 157}Er up to and above band termination

Abstract

The high-spin structure of {sup 157}Er has been greatly expanded using the Gammasphere spectrometer to investigate the {sup 114}Cd({sup 48}Ca,5n) reaction at 215 MeV. Many new transitions have been placed in a greatly augmented level scheme up to spin 40({Dirac_h}/2{pi}) with many collective rotational sequences established. With increasing angular momentum, this nucleus undergoes a Coriolis-induced shape transition from a deformed state of collective rotation to a noncollective configuration. This transition manifests itself as favored band termination near I=45({Dirac_h}/2{pi}) in three rotational structures. Many weakly populated states lying at high excitation energy that decay into the terminating states have been discovered. Cranked-Nilsson-Strutinsky calculations suggest that the levels that feed the terminating states arise from weakly collective configurations that break the Z=64 semimagic core.

Authors:
; ; ;  [1]; ; ;  [2]; ; ;  [3]; ; ; ; ; ; ;  [4];  [5]
  1. Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE (United Kingdom)
  2. CCLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD (United Kingdom)
  3. Department of Physics, Florida State University, Tallahassee, Florida 32306 (United States)
  4. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  5. Department of Mathematical Physics, Lund Institute of Technology, P.O. Box 118, S-22100 Lund (Sweden)
Publication Date:
OSTI Identifier:
20771579
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 73; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.73.064303; (c) 2006 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; CADMIUM 114; CALCIUM 48; ERBIUM 157; EXCITATION; HIGH SPIN STATES; MEV RANGE; NUCLEAR DECAY; NUCLEAR STRUCTURE; ROTATION; SPIN

Citation Formats

Evans, A O, Paul, E S, Choy, P T.W., Nolan, P J, Simpson, J, Appelbe, D E, Joss, D T, Riley, M A, Campbell, D B, Pipidis, A, Clark, R M, Cromaz, M, Fallon, P, Goergen, A, Lee, I Y, Macchiavelli, A O, Ward, D, and Ragnarsson, I. High-spin structure in {sup 157}Er up to and above band termination. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.064303.
Evans, A O, Paul, E S, Choy, P T.W., Nolan, P J, Simpson, J, Appelbe, D E, Joss, D T, Riley, M A, Campbell, D B, Pipidis, A, Clark, R M, Cromaz, M, Fallon, P, Goergen, A, Lee, I Y, Macchiavelli, A O, Ward, D, & Ragnarsson, I. High-spin structure in {sup 157}Er up to and above band termination. United States. https://doi.org/10.1103/PhysRevC.73.064303
Evans, A O, Paul, E S, Choy, P T.W., Nolan, P J, Simpson, J, Appelbe, D E, Joss, D T, Riley, M A, Campbell, D B, Pipidis, A, Clark, R M, Cromaz, M, Fallon, P, Goergen, A, Lee, I Y, Macchiavelli, A O, Ward, D, and Ragnarsson, I. Thu . "High-spin structure in {sup 157}Er up to and above band termination". United States. https://doi.org/10.1103/PhysRevC.73.064303.
@article{osti_20771579,
title = {High-spin structure in {sup 157}Er up to and above band termination},
author = {Evans, A O and Paul, E S and Choy, P T.W. and Nolan, P J and Simpson, J and Appelbe, D E and Joss, D T and Riley, M A and Campbell, D B and Pipidis, A and Clark, R M and Cromaz, M and Fallon, P and Goergen, A and Lee, I Y and Macchiavelli, A O and Ward, D and Ragnarsson, I},
abstractNote = {The high-spin structure of {sup 157}Er has been greatly expanded using the Gammasphere spectrometer to investigate the {sup 114}Cd({sup 48}Ca,5n) reaction at 215 MeV. Many new transitions have been placed in a greatly augmented level scheme up to spin 40({Dirac_h}/2{pi}) with many collective rotational sequences established. With increasing angular momentum, this nucleus undergoes a Coriolis-induced shape transition from a deformed state of collective rotation to a noncollective configuration. This transition manifests itself as favored band termination near I=45({Dirac_h}/2{pi}) in three rotational structures. Many weakly populated states lying at high excitation energy that decay into the terminating states have been discovered. Cranked-Nilsson-Strutinsky calculations suggest that the levels that feed the terminating states arise from weakly collective configurations that break the Z=64 semimagic core.},
doi = {10.1103/PhysRevC.73.064303},
url = {https://www.osti.gov/biblio/20771579}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 6,
volume = 73,
place = {United States},
year = {2006},
month = {6}
}