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Title: Smooth terminating bands in {sup 112}Te: Particle-hole induced collectivity

Abstract

The Gammasphere spectrometer, in conjunction with the Microball charged-particle array, was used to investigate high-spin states in {sup 112}Te via {sup 58}Ni({sup 58}Ni, 4p{gamma}) reactions at 240 and 250 MeV. Several smooth terminating bands were established, and lifetime measurements were performed for the strongest one using the Doppler-shift attenuation method. Results obtained in the spin range 18-32({Dirac_h}/2{pi}) yield a transition quadrupole moment of 4.0{+-}0.5eb, which corresponds to a quadrupole deformation epsilon{sub 2}=0.26{+-}0.03; this value is significantly larger than the ground-state deformation of tellurium isotopes. It was also possible to extract a transition quadrupole moment for the yrast band in {sup 114}Xe, produced via the 58Ni (58Ni, 2p{gamma}) reaction. A value of 3.0{+-}0.5eb was found in the spin range 16-24({Dirac_h}/2{pi}), which corresponds to a quadrupole deformation epsilon{sub 2}=0.19{+-}0.03. Cranked Nilsson-Strutinsky calculations are used to interpret the results.

Authors:
; ; ; ; ;  [1]; ; ; ; ; ;  [2]; ; ;  [3];  [4]; ;  [5];  [6];  [7] more »;  [8];  [9];  [10] « less
  1. Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE (United Kingdom)
  2. Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794-3800 (United States)
  3. Department of Chemistry, Washington University, St. Louis, Missouri 63130 (United States)
  4. Schuster Laboratory, The University of Manchester, Brunswick Street, Manchester M13 9PL (United Kingdom)
  5. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  6. Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794-3800, USA (United States)
  7. (United Kingdom)
  8. Department of Physics and Astronomy, Mississippi State University, Mississippi 39762, USA (United States)
  9. (Sweden)
  10. (Latvia) (and others)
Publication Date:
OSTI Identifier:
20990947
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.75.014308; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COLLECTIVE MODEL; DEFORMATION; DEFORMED NUCLEI; DOPPLER EFFECT; DSA METHOD; GROUND STATES; HEAVY ION REACTIONS; HIGH SPIN STATES; MASS NUMBER; MEV RANGE 100-1000; NICKEL 58; NUCLEAR ELECTRIC MOMENTS; QUADRUPOLE MOMENTS; QUADRUPOLES; SHELL MODELS; SPIN; TELLURIUM 112; XENON 114; YRAST STATES

Citation Formats

Paul, E. S., Evans, A. O., Boston, A. J., Chantler, H. J., Nolan, P. J., Semple, A. T., Starosta, K., Chiara, C. J., Fossan, D. B., Lane, G. J., Sears, J. M., Vaman, C., Devlin, M., LaFosse, D. R., Sarantites, D. G., Fletcher, A. M., Lee, I. Y., Macchiavelli, A. O., Smith, J. F., Schuster Laboratory, The University of Manchester, Brunswick Street, Manchester M13 9PL, Afanasjev, A. V., Department of Mathematical Physics, Lund Institute of Technology, P.O. Box 118, S-22100 Lund, and Laboratory of Radiation Physics, Institute of Solid State Physics, University of Latvia, LV 2169 Salaspils, Miera str. 31. Smooth terminating bands in {sup 112}Te: Particle-hole induced collectivity. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.014308.
Paul, E. S., Evans, A. O., Boston, A. J., Chantler, H. J., Nolan, P. J., Semple, A. T., Starosta, K., Chiara, C. J., Fossan, D. B., Lane, G. J., Sears, J. M., Vaman, C., Devlin, M., LaFosse, D. R., Sarantites, D. G., Fletcher, A. M., Lee, I. Y., Macchiavelli, A. O., Smith, J. F., Schuster Laboratory, The University of Manchester, Brunswick Street, Manchester M13 9PL, Afanasjev, A. V., Department of Mathematical Physics, Lund Institute of Technology, P.O. Box 118, S-22100 Lund, & Laboratory of Radiation Physics, Institute of Solid State Physics, University of Latvia, LV 2169 Salaspils, Miera str. 31. Smooth terminating bands in {sup 112}Te: Particle-hole induced collectivity. United States. doi:10.1103/PHYSREVC.75.014308.
Paul, E. S., Evans, A. O., Boston, A. J., Chantler, H. J., Nolan, P. J., Semple, A. T., Starosta, K., Chiara, C. J., Fossan, D. B., Lane, G. J., Sears, J. M., Vaman, C., Devlin, M., LaFosse, D. R., Sarantites, D. G., Fletcher, A. M., Lee, I. Y., Macchiavelli, A. O., Smith, J. F., Schuster Laboratory, The University of Manchester, Brunswick Street, Manchester M13 9PL, Afanasjev, A. V., Department of Mathematical Physics, Lund Institute of Technology, P.O. Box 118, S-22100 Lund, and Laboratory of Radiation Physics, Institute of Solid State Physics, University of Latvia, LV 2169 Salaspils, Miera str. 31. Mon . "Smooth terminating bands in {sup 112}Te: Particle-hole induced collectivity". United States. doi:10.1103/PHYSREVC.75.014308.
@article{osti_20990947,
title = {Smooth terminating bands in {sup 112}Te: Particle-hole induced collectivity},
author = {Paul, E. S. and Evans, A. O. and Boston, A. J. and Chantler, H. J. and Nolan, P. J. and Semple, A. T. and Starosta, K. and Chiara, C. J. and Fossan, D. B. and Lane, G. J. and Sears, J. M. and Vaman, C. and Devlin, M. and LaFosse, D. R. and Sarantites, D. G. and Fletcher, A. M. and Lee, I. Y. and Macchiavelli, A. O. and Smith, J. F. and Schuster Laboratory, The University of Manchester, Brunswick Street, Manchester M13 9PL and Afanasjev, A. V. and Department of Mathematical Physics, Lund Institute of Technology, P.O. Box 118, S-22100 Lund and Laboratory of Radiation Physics, Institute of Solid State Physics, University of Latvia, LV 2169 Salaspils, Miera str. 31},
abstractNote = {The Gammasphere spectrometer, in conjunction with the Microball charged-particle array, was used to investigate high-spin states in {sup 112}Te via {sup 58}Ni({sup 58}Ni, 4p{gamma}) reactions at 240 and 250 MeV. Several smooth terminating bands were established, and lifetime measurements were performed for the strongest one using the Doppler-shift attenuation method. Results obtained in the spin range 18-32({Dirac_h}/2{pi}) yield a transition quadrupole moment of 4.0{+-}0.5eb, which corresponds to a quadrupole deformation epsilon{sub 2}=0.26{+-}0.03; this value is significantly larger than the ground-state deformation of tellurium isotopes. It was also possible to extract a transition quadrupole moment for the yrast band in {sup 114}Xe, produced via the 58Ni (58Ni, 2p{gamma}) reaction. A value of 3.0{+-}0.5eb was found in the spin range 16-24({Dirac_h}/2{pi}), which corresponds to a quadrupole deformation epsilon{sub 2}=0.19{+-}0.03. Cranked Nilsson-Strutinsky calculations are used to interpret the results.},
doi = {10.1103/PHYSREVC.75.014308},
journal = {Physical Review. C, Nuclear Physics},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}
  • No abstract prepared.
  • High-spin states have been populated in {sub 52}{sup 110}Te via {sup 58}Ni({sup 58}Ni,{alpha}2p{gamma}) reactions at 240 and 250 MeV. The Gammasphere {gamma}-ray spectrometer was used in conjunction with the Microball charged-particle detector. The high-spin (I>30) collective level scheme of {sup 110}Te, up to {approx}45({Dirac_h}/2{pi}), is discussed in this paper. Four new decoupled ({delta}I=2) high-spin structures have been observed for the first time, together with two strongly coupled ({delta}I=1) bands. These bands all show the characteristics of smooth band termination, and are discussed within the framework of the cranked Nilsson-Strutinsky approach.
  • Two sets of strongly coupled rotational bands have been identified in {sup 62}Zn. These bands have been observed up to the terminating states of their respective configurations. Lifetime measurements indicate that the transition quadrupole moments in these bands decrease as termination is approached. These results establish the first terminating states of rotational bands in the A{approximately}60 mass region and confirm the predicted loss of collectivity associated with smooth band termination. {copyright} {ital 1998} {ital The American Physical Society}
  • Lifetimes of states in two rotational bands in {sup 108}Sn and one in {sup 109}Sb have been determined using the Doppler shift attenuation method. The deduced quadrupole moments for the states are in excellent agreement with cranked Nilsson model predictions, which imply a gradual change in the nuclear shape from collective near-prolate at medium spin to noncollective oblate at high spin. This change results from the gradual alignment of the spin vectors of the valence particles and holes in a specific configuration. These data provide crucial evidence in support of the phenomenon of smooth band termination. {copyright} {ital 1998} {italmore » The American Physical Society}« less
  • Collective structures have been investigated via {gamma}-ray studies in {sup 117,119}Sb. Previously observed strongly coupled ({pi}g{sub 9/2}){sup {minus}1} bands in both nuclei involving 1p-1h proton excitations across the Z=50 gap have been extended, and an alignment of h{sub 11/2} neutrons identified. New negative-parity strongly coupled bands based on this proton configuration have also been observed in both nuclei. Decoupled bands involving 2p-2h excitations across the gap have been observed in {sup 119}Sb, similar to those presented earlier for {sup 117}Sb. These bands are interpreted as due to the coupling of a low-K valence proton to the ({pi}g{sub 7/2}d{sub 5/2}){sup 2}{circle_times}({pi}g{submore » 9/2}){sup {minus}2} deformed state of the respective {sub 50}Sn core nuclei. Anomalies in the expected h{sub 11/2} neutron crossing of these bands are discussed. {copyright} {ital 1997} {ital The American Physical Society}« less