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Title: High-spin states in {sup 135}Xe

Abstract

The high-spin structure of the {sup 135}Xe isotope was studied via prompt {gamma}-ray spectroscopy in two different experiments: (i) as a fission fragment following the fission of the {sup 226}Th compound nucleus formed in a fusion-fission reaction and (ii) as an evaporation residue in the {sub 136}Xe(n,2n{gamma}){sup 135}Xe reaction. The level scheme above the previously known 11/2{sup -} isomer was established up to 3170-keV excitation energy. A strong sequence has been firmly assigned to {sup 135}Xe and forms the yrast decay path including the (15/2{sup -}) and (19/2{sup -}) states. A much weaker sequence of {gamma} rays has been observed and tentatively assigned to {sup 135}Xe and is a candidate for the off-yrast sequence that includes the (13/2{sup -}) and (17/2{sup -}) states, expected in the weak coupling of the h{sub 11/2} neutron to the even-A core. The experimental results are compared with predictions from shell-model calculations.

Authors:
; ;  [1];  [2]; ;  [3];  [4]; ; ; ;  [5]; ;  [6]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903 (United States)
  3. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
  4. Physik Department E12, Technische Universitaet Muenchen, D-85748 Garching (Germany)
  5. Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  6. C.E.A., DAM Ile-de-France, DPTA/Service de Physique Nucleaire, BP 12, F-91680 Bruyeres-le-Chatel (France)
Publication Date:
OSTI Identifier:
20995284
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevC.75.054322; (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; COMPOUND NUCLEI; EVAPORATION; EXCITATION; FISSION; FISSION FRAGMENTS; FISSION PRODUCTS; GAMMA RADIATION; GAMMA SPECTRA; GAMMA SPECTROSCOPY; HIGH SPIN STATES; KEV RANGE; MASS NUMBER; NEUTRONS; SHELL MODELS; SPIN; THORIUM 226; XENON 135; YRAST STATES

Citation Formats

Fotiades, N., Nelson, R. O., Devlin, M., Cizewski, J. A., Becker, J. A., Younes, W., Kruecken, R., Clark, R. M., Fallon, P., Lee, I. Y., Macchiavelli, A. O., Ethvignot, T., and Granier, T.. High-spin states in {sup 135}Xe. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.054322.
Fotiades, N., Nelson, R. O., Devlin, M., Cizewski, J. A., Becker, J. A., Younes, W., Kruecken, R., Clark, R. M., Fallon, P., Lee, I. Y., Macchiavelli, A. O., Ethvignot, T., & Granier, T.. High-spin states in {sup 135}Xe. United States. doi:10.1103/PHYSREVC.75.054322.
Fotiades, N., Nelson, R. O., Devlin, M., Cizewski, J. A., Becker, J. A., Younes, W., Kruecken, R., Clark, R. M., Fallon, P., Lee, I. Y., Macchiavelli, A. O., Ethvignot, T., and Granier, T.. Tue . "High-spin states in {sup 135}Xe". United States. doi:10.1103/PHYSREVC.75.054322.
@article{osti_20995284,
title = {High-spin states in {sup 135}Xe},
author = {Fotiades, N. and Nelson, R. O. and Devlin, M. and Cizewski, J. A. and Becker, J. A. and Younes, W. and Kruecken, R. and Clark, R. M. and Fallon, P. and Lee, I. Y. and Macchiavelli, A. O. and Ethvignot, T. and Granier, T.},
abstractNote = {The high-spin structure of the {sup 135}Xe isotope was studied via prompt {gamma}-ray spectroscopy in two different experiments: (i) as a fission fragment following the fission of the {sup 226}Th compound nucleus formed in a fusion-fission reaction and (ii) as an evaporation residue in the {sub 136}Xe(n,2n{gamma}){sup 135}Xe reaction. The level scheme above the previously known 11/2{sup -} isomer was established up to 3170-keV excitation energy. A strong sequence has been firmly assigned to {sup 135}Xe and forms the yrast decay path including the (15/2{sup -}) and (19/2{sup -}) states. A much weaker sequence of {gamma} rays has been observed and tentatively assigned to {sup 135}Xe and is a candidate for the off-yrast sequence that includes the (13/2{sup -}) and (17/2{sup -}) states, expected in the weak coupling of the h{sub 11/2} neutron to the even-A core. The experimental results are compared with predictions from shell-model calculations.},
doi = {10.1103/PHYSREVC.75.054322},
journal = {Physical Review. C, Nuclear Physics},
number = 5,
volume = 75,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • The g factor of the 15/2{sup -} state in {sup 137}Xe was measured for the first time by using a newly developed technique for measuring angular correlations with Gammasphere. Spins and parities were assigned to several levels in the N=83 isotones {sup 135}Te, {sup 136}I, {sup 137}Xe, and {sup 138}Cs. The calculated g factor in the shell-model frame is in good agreement with the measured one in the present work. Shell-model calculations also support our spin-parity assignments.
  • A search for deeply bound pionic states of xenon produced in the {sup 136}Xe(d, {sup 3}He){sup 135}Xe{sub {pi}}{sub -bound} reaction at E{sub d} = 500 MeV is reported. The population of the 1s pionic-atom state of {sup 135}Xe is observed on the predicted level of the cross section {approx}40 {mu}b/sr. The binding energy of the 1s state, B = 2.9 {+-} 0.5 MeV, however, is lower than theoretically predicted.
  • An in-beam spectroscopic study of /sup 135/Pr was made using a 91 MeV /sup 120/Sn(/sup 19/F,4n) reaction. Two positive parity bands were observed based on the g-italic/sub 7/2/ proton orbital with (..pi..,..cap alpha..) = (+, +- (1/2)). A strongly populated negative parity (-,-(1/2)) band was also seen (based on the h-italic/sub 11/2/ proton orbital). The unfavored (-,+(1/2)) structure may also be present. In both the positive and negative parity bands the first backbend is attributed to the alignment of two h-italic/sub 11/2/ protons on the basis of cranked shell model calculations. The crossing frequency was found to increase in themore » (-,-(1/2)) band because of blocking of the h-italic/sub 11/2/ orbital. The alignment of protons in /sup 135/Pr causes a shift of ..gamma.. towards --+10/sup 0/ with nearly collective prolate deformation. Also, there is some evidence for a second backbend and an upbend in the case of positive and negative parity bands, respectively. They could result from the alignment of the h-italic/sub 11/2/ neutrons.« less
  • High spin states of {sup 135}La have been investigated using the reaction {sup 128}Te({sup 11}B,4n){sup 135}La at a beam energy of 50.5 MeV. Two negative parity dipole bands (ΔI = 1) have been established. Crossover E2 transitions have been observed for the first time in one of the dipole bands. For the Tilted Axis Cranking (TAC) calculations, a three-quasiparticle (3qp) configuration π(h{sub 11/2}){sup 1}⊗ν(h{sub 11/2}){sup −2} and a five-quasiparticle (5qp) configuration π(h{sub 11/2}){sup 1}(g{sub 7/2}/d{sub 5/2}){sup 2}⊗ν(h{sub 11/2}){sup −2} have been taken for the two negative parity dipole bands. The comparison of experimental observables with TAC calculations supports the configurationmore » assignments for both the dipole bands.« less