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Title: Band structure in {sup 79}Y and the question of T=0 pairing

Abstract

Excited states in the N=Z+1 nucleus {sup 79}Y were identified using the reaction {sup 28}Si({sup 54}Fe,p2n){sup 79}Y at a 200 MeV beam energy and an experimental set up consisting of an array of Ge detectors and the Recoil Mass Spectrometer at Oak Ridge National Laboratory. With the help of additional {gamma}-{gamma} coincidence data obtained with Gammasphere, these {gamma}-rays were found to form a strongly-coupled rotational band with rigid-rotor-like behavior. Results of conventional Nilsson-Strutinsky cranked shell model calculations, which predict a deformation of {beta}{sub 2}{approx}0.4, are in excellent agreement with the properties of this band. Similar calculations for the neighboring N=Z and N=Z+1 nuclei are also in good agreement with experimental data. This suggests that the presence of the putative T=0 neutron-proton pairing does not significantly affect such simple observables as the moments of inertia of these bands at low spins.

Authors:
;  [1];  [2]; ; ; ; ; ; ; ;  [1];  [3];  [2];  [4]; ; ; ;  [5]; ; more »; ;  [6];  [7] « less
  1. Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
  2. (United States)
  3. Joint Institute of Heavy Ion Research, Oak Ridge, Tennessee 37831 (United States)
  4. (Poland)
  5. Department of Physics, University of Pittsburgh, Pittsburgh, Philadelphia 15260 (United States)
  6. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  7. CCLRC, Daresbury Laboratory, Warrington WA4 4AD (United Kingdom) (and others)
Publication Date:
OSTI Identifier:
21208214
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 481; Journal Issue: 1; Conference: Nuclear structure 98 conference, Gatlinburg, TN (United States), 10-15 Aug 1998; Other Information: DOI: 10.1063/1.59547; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CRANKING MODEL; GAMMA SPECTRA; GE SEMICONDUCTOR DETECTORS; IRON 54 REACTIONS; MEV RANGE; NEUTRONS; NUCLEAR STRUCTURE; ORNL; PAIRING INTERACTIONS; PROTONS; RECOILS; ROTATIONAL STATES; SHELL MODELS; SILICON 28 TARGET; SPIN; YTTRIUM 79

Citation Formats

Paul, S. D., Gross, C. J., Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 37831, Baktash, C., Galindo-Uribarri, A., Radford, D. C., Rudolph, D., Rykaczewski, K., Shapira, D., Toth, K. S., Yu, C. H., Satula, W., Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, Institute of Theoretical Physics, Warsaw University, PL-00681 Warsaw, Birriel, I., Saladin, J. X., Winchell, D. F., Wood, V. Q., Clark, R. M., Fallon, P., Lee, I. Y., Macchiavelli, A. O., and Cunningham, R. A. Band structure in {sup 79}Y and the question of T=0 pairing. United States: N. p., 1999. Web. doi:10.1063/1.59547.
Paul, S. D., Gross, C. J., Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 37831, Baktash, C., Galindo-Uribarri, A., Radford, D. C., Rudolph, D., Rykaczewski, K., Shapira, D., Toth, K. S., Yu, C. H., Satula, W., Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, Institute of Theoretical Physics, Warsaw University, PL-00681 Warsaw, Birriel, I., Saladin, J. X., Winchell, D. F., Wood, V. Q., Clark, R. M., Fallon, P., Lee, I. Y., Macchiavelli, A. O., & Cunningham, R. A. Band structure in {sup 79}Y and the question of T=0 pairing. United States. doi:10.1063/1.59547.
Paul, S. D., Gross, C. J., Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 37831, Baktash, C., Galindo-Uribarri, A., Radford, D. C., Rudolph, D., Rykaczewski, K., Shapira, D., Toth, K. S., Yu, C. H., Satula, W., Department of Physics, University of Tennessee, Knoxville, Tennessee 37996, Institute of Theoretical Physics, Warsaw University, PL-00681 Warsaw, Birriel, I., Saladin, J. X., Winchell, D. F., Wood, V. Q., Clark, R. M., Fallon, P., Lee, I. Y., Macchiavelli, A. O., and Cunningham, R. A. Thu . "Band structure in {sup 79}Y and the question of T=0 pairing". United States. doi:10.1063/1.59547.
@article{osti_21208214,
title = {Band structure in {sup 79}Y and the question of T=0 pairing},
author = {Paul, S. D. and Gross, C. J. and Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 37831 and Baktash, C. and Galindo-Uribarri, A. and Radford, D. C. and Rudolph, D. and Rykaczewski, K. and Shapira, D. and Toth, K. S. and Yu, C. H. and Satula, W. and Department of Physics, University of Tennessee, Knoxville, Tennessee 37996 and Institute of Theoretical Physics, Warsaw University, PL-00681 Warsaw and Birriel, I. and Saladin, J. X. and Winchell, D. F. and Wood, V. Q. and Clark, R. M. and Fallon, P. and Lee, I. Y. and Macchiavelli, A. O. and Cunningham, R. A.},
abstractNote = {Excited states in the N=Z+1 nucleus {sup 79}Y were identified using the reaction {sup 28}Si({sup 54}Fe,p2n){sup 79}Y at a 200 MeV beam energy and an experimental set up consisting of an array of Ge detectors and the Recoil Mass Spectrometer at Oak Ridge National Laboratory. With the help of additional {gamma}-{gamma} coincidence data obtained with Gammasphere, these {gamma}-rays were found to form a strongly-coupled rotational band with rigid-rotor-like behavior. Results of conventional Nilsson-Strutinsky cranked shell model calculations, which predict a deformation of {beta}{sub 2}{approx}0.4, are in excellent agreement with the properties of this band. Similar calculations for the neighboring N=Z and N=Z+1 nuclei are also in good agreement with experimental data. This suggests that the presence of the putative T=0 neutron-proton pairing does not significantly affect such simple observables as the moments of inertia of these bands at low spins.},
doi = {10.1063/1.59547},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 481,
place = {United States},
year = {1999},
month = {9}
}