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High spin {gamma}-ray spectroscopy of {sup 121,122}Xe

Abstract

High-spin states have been populated in {sup 121,122}Xe using the reactions {sup 108}Pd({sup 16}O,3n){sup 121}Xe at 65 MeV and {sup 96}Zr({sup 30}Si,4n/5n){sup 122}Xe/{sup 121}Xe at 135 MeV. Coincident {gamma} rays following the neutron evaporation were detected by six Compton-suppressed Ge detectors and the TESSA3 array respectively. The level structure of {sup 121}Xe and {sup 122}Xe has been extended up to 47/2 {Dirac_h} and 32 {Dirac_h} respectively. In {sup 121}Xe a coupled band was found feeding the 19/2{sup -} level. In {sup 122}Xe several decays are suggested to be a sequence of stretched E2 quadrupole transitions connecting states of positive parity. While in {sup 121}Xe this phenomenon was not observed, at high spin a phase transition from prolate collective rotation to oblate single particle excitation was detected in {sup 122}Xe. For the new, probably positive parity side band in{sup 122}Xe a four quasi-neutron or a two quasi-proton configuration of h{sub 11/2} quasi-nucleons might be considered. The positive parity high spin structure in {sup 122}Xe contains three I{sup {pi}} = 22{sup +} states of different character. This is predicted by TRS (total Routhian surface) calculations, which identify these states as two shapes with predominantly prolate collective characteristic and the third as an  More>>
Authors:
Timmers, H; [1]  Riley, M A; Hanna, F; Mullins, S M; Sharpey-Schafer, J F; [1]  Hughes, J R; Fossan, D B; Liang, Y; Ma, R; Xu, N; [2]  Simpson, J; Bentley, M A; [3]  Bengtsson, T; [4]  Wyss, R [5] 
  1. Liverpool Univ. (United Kingdom). Oliver Lodge Lab.
  2. Department of Physics, SUNY at Stony Brook, NY (United States)
  3. Daresbury Lab. (United Kingdom)
  4. Lund Univ. (Sweden). Dept. of Mathematical Physics
  5. Institute for Heavy Ion Research, Oak Ridge, TN (United States)
Publication Date:
Aug 01, 1992
Product Type:
Conference
Report Number:
AECL-10613(v.2); CONF-920548-; CONF-9205444-
Reference Number:
SCA: 663110; 663560; PA: AIX-28:057824; EDB-97:122531; SN: 97001841947
Resource Relation:
Conference: Workshop on large gamma-ray detector arrays, Ottawa (Canada); Chalk River (Canada), 18-23 May 1992; 19-23 May 1992; Other Information: PBD: Aug 1992; Related Information: Is Part Of Proceedings of the international conference on nuclear structure at high angular momentum and the workshop on large gamma-ray detector arrays; PB: 500 p.
Subject:
66 PHYSICS; XENON 121; HIGH SPIN STATES; XENON 122; COINCIDENCE SPECTROMETRY; CRANKING MODEL; DEFORMED NUCLEI; E2-TRANSITIONS; GAMMA SPECTRA; GAMMA SPECTROSCOPY; HEAVY ION FUSION REACTIONS; NEUTRONS; NUCLEAR DEFORMATION; NUCLEAR STRUCTURE; OXYGEN 16 REACTIONS; PALLADIUM 108 TARGET; ROTATIONAL STATES; SHAPE; SILICON 30 REACTIONS; ZIRCONIUM 96 TARGET
OSTI ID:
520585
Research Organizations:
Atomic Energy of Canada Ltd., Chalk River, ON (Canada). Chalk River Nuclear Labs.
Country of Origin:
Canada
Language:
English
Other Identifying Numbers:
Other: ON: DE97638960; TRN: CA9700491057824
Availability:
INIS; OSTI as DE97638960
Submitting Site:
INIS
Size:
pp. 245-249
Announcement Date:

Citation Formats

Timmers, H, Riley, M A, Hanna, F, Mullins, S M, Sharpey-Schafer, J F, Hughes, J R, Fossan, D B, Liang, Y, Ma, R, Xu, N, Simpson, J, Bentley, M A, Bengtsson, T, and Wyss, R. High spin {gamma}-ray spectroscopy of {sup 121,122}Xe. Canada: N. p., 1992. Web.
Timmers, H, Riley, M A, Hanna, F, Mullins, S M, Sharpey-Schafer, J F, Hughes, J R, Fossan, D B, Liang, Y, Ma, R, Xu, N, Simpson, J, Bentley, M A, Bengtsson, T, & Wyss, R. High spin {gamma}-ray spectroscopy of {sup 121,122}Xe. Canada.
Timmers, H, Riley, M A, Hanna, F, Mullins, S M, Sharpey-Schafer, J F, Hughes, J R, Fossan, D B, Liang, Y, Ma, R, Xu, N, Simpson, J, Bentley, M A, Bengtsson, T, and Wyss, R. 1992. "High spin {gamma}-ray spectroscopy of {sup 121,122}Xe." Canada.
@misc{etde_520585,
title = {High spin {gamma}-ray spectroscopy of {sup 121,122}Xe}
author = {Timmers, H, Riley, M A, Hanna, F, Mullins, S M, Sharpey-Schafer, J F, Hughes, J R, Fossan, D B, Liang, Y, Ma, R, Xu, N, Simpson, J, Bentley, M A, Bengtsson, T, and Wyss, R}
abstractNote = {High-spin states have been populated in {sup 121,122}Xe using the reactions {sup 108}Pd({sup 16}O,3n){sup 121}Xe at 65 MeV and {sup 96}Zr({sup 30}Si,4n/5n){sup 122}Xe/{sup 121}Xe at 135 MeV. Coincident {gamma} rays following the neutron evaporation were detected by six Compton-suppressed Ge detectors and the TESSA3 array respectively. The level structure of {sup 121}Xe and {sup 122}Xe has been extended up to 47/2 {Dirac_h} and 32 {Dirac_h} respectively. In {sup 121}Xe a coupled band was found feeding the 19/2{sup -} level. In {sup 122}Xe several decays are suggested to be a sequence of stretched E2 quadrupole transitions connecting states of positive parity. While in {sup 121}Xe this phenomenon was not observed, at high spin a phase transition from prolate collective rotation to oblate single particle excitation was detected in {sup 122}Xe. For the new, probably positive parity side band in{sup 122}Xe a four quasi-neutron or a two quasi-proton configuration of h{sub 11/2} quasi-nucleons might be considered. The positive parity high spin structure in {sup 122}Xe contains three I{sup {pi}} = 22{sup +} states of different character. This is predicted by TRS (total Routhian surface) calculations, which identify these states as two shapes with predominantly prolate collective characteristic and the third as an oblate single particle configuration. 12 refs., 3 figs.}
place = {Canada}
year = {1992}
month = {Aug}
}