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Title: Mapping the periphery of deformation in the A {approximately} 80 region : a study of {sup 83}Nb.

Abstract

No abstract prepared.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); National Science Foundation (NSF); Research Corp. Grant
OSTI Identifier:
914874
Report Number(s):
ANL/PHY/JA-57871
Journal ID: ISSN 0556-2813; PRVCAN; TRN: US200812%%121
DOE Contract Number:
DE-AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. C; Journal Volume: 75; Journal Issue: 2007
Country of Publication:
United States
Language:
ENGLISH
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; NIOBIUM 83; DEFORMED NUCLEI; NUCLEAR DEFORMATION

Citation Formats

Fischer, S. M., Lister, C. J., Carpenter, M. P., Hammond, N. J., Janssens, R.V.F, Moore, E. F., Mukherjee, G., Seweryniak, D., Sinha, S., Freeman, S. J., Carney, J., Balamuth, D. P., Sun, Y., Physics, DePaul Univ., Univ. of Manchester, Univ. of Pennsylvania, Univ. of Notre Dame, Tsinghua Univ., and Xuzhou Normal Univ. Mapping the periphery of deformation in the A {approximately} 80 region : a study of {sup 83}Nb.. United States: N. p., 2007. Web. doi:10.1103/PhysRevC.75.064310.
Fischer, S. M., Lister, C. J., Carpenter, M. P., Hammond, N. J., Janssens, R.V.F, Moore, E. F., Mukherjee, G., Seweryniak, D., Sinha, S., Freeman, S. J., Carney, J., Balamuth, D. P., Sun, Y., Physics, DePaul Univ., Univ. of Manchester, Univ. of Pennsylvania, Univ. of Notre Dame, Tsinghua Univ., & Xuzhou Normal Univ. Mapping the periphery of deformation in the A {approximately} 80 region : a study of {sup 83}Nb.. United States. doi:10.1103/PhysRevC.75.064310.
Fischer, S. M., Lister, C. J., Carpenter, M. P., Hammond, N. J., Janssens, R.V.F, Moore, E. F., Mukherjee, G., Seweryniak, D., Sinha, S., Freeman, S. J., Carney, J., Balamuth, D. P., Sun, Y., Physics, DePaul Univ., Univ. of Manchester, Univ. of Pennsylvania, Univ. of Notre Dame, Tsinghua Univ., and Xuzhou Normal Univ. Mon . "Mapping the periphery of deformation in the A {approximately} 80 region : a study of {sup 83}Nb.". United States. doi:10.1103/PhysRevC.75.064310.
@article{osti_914874,
title = {Mapping the periphery of deformation in the A {approximately} 80 region : a study of {sup 83}Nb.},
author = {Fischer, S. M. and Lister, C. J. and Carpenter, M. P. and Hammond, N. J. and Janssens, R.V.F and Moore, E. F. and Mukherjee, G. and Seweryniak, D. and Sinha, S. and Freeman, S. J. and Carney, J. and Balamuth, D. P. and Sun, Y. and Physics and DePaul Univ. and Univ. of Manchester and Univ. of Pennsylvania and Univ. of Notre Dame and Tsinghua Univ. and Xuzhou Normal Univ.},
abstractNote = {No abstract prepared.},
doi = {10.1103/PhysRevC.75.064310},
journal = {Phys. Rev. C},
number = 2007,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • {sup 83}Nb has been studied in order to locate the upper extent of large deformation in the N{approx}Z{approx}40 region and ascertain its sign and magnitude. The decay scheme has been considerably extended by studying gamma decay following the {sup 58}Ni({sup 28}Si, p2n){sup 83}Nb reaction at 204 and 215 MeV and using Gammasphere. Both signature partners of two rotational bands have been observed. The band properties support a I{sup {pi}}=(5/2){sup +} ground state spin assignment. The in-band branching ratios and multipole mixing ratios were found to be consistent with significant prolate deformation, as found in other N=42 isotones. The bands aremore » particularly similar to the isotone {sup 81}Y. A projected shell model analysis has been performed which provides good reproduction of the features of both bands. The calculations indicate the nucleus to be nearly axially symmetric. {sup 82,83}Nb may be the heaviest nuclei in the A{approx}80 region with large deformation. The deformation is predicted to fall in heavier systems approaching {sup 100}Sn. The conditions appear to be right for the occurrence of K isomers.« less
  • The energy levels in /sup 83//sub 39/Y and /sup 83//sub 40/Z are identified and investigated along with /sup 80/Sr via in-beam {gamma}-ray spectroscopy to explore the new region of strong deformation centered around N = Z = 38. The reaction /sup 51/V(/sup 32/S,rho2n)/sup 80/Sr was studied at the Holifield Heavy Ion Research Facility and reactions /sup 54/Fe(/sup 32/S,{alpha}2rho)/sup 80/Sr; /sup 54/Fe(/sup 32/S,3rho)/sup 83/Y and /sup 54/Fe(/sup 32/S,2rhon)/sup 83/Zr at the Max Planck Tandem. The deformation in the ground state band in /sup 80/Sr observed to 12/sup +/ shows a significant increase as N decreases toward 38. A 9/2/sup +/ groundmore » state band in /sup 83//sub 39/Y observed to (29/2/sup +/) exhibits larger deformation than an excited (9/2/sup +/) band in /sup 83//sub 40/Zr, as expected as Z moves away from 38. These nuclei support the proposal that the large deformation observed in this region arises from the reinforcing of the proton and neutron shape driving force as both N and Z approach shell gaps at large deformation for N and Z of 38.« less
  • Excited states in the very neutron deficient isotope {sup 83}Nb were observed for the first time in the reaction {sup 28}Si({sup 58}Ni,2{ital np}){sup 83}Nb at 195 MeV. Identification was made with a recoil separator and a cross section of {sigma}=180(80) {mu}b estimated. Eight transitions were arranged in a level scheme which resembles the {ital N}=41 isotones {sup 77}Kr and {sup 79}Sr rather than the heavier, weakly deformed Nb isotopes. This suggests that a shape transition to a strong deformation exists in the light Nb isotopes. A ground state spin of 5/2{sup +} is suggested.