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High-spin spectroscopy of {sup 168}Yb and the reduction of pairing correlations

Abstract

The high spin states of {sup 168}Yb were investigated by means of in-beam gamma spectroscopy with the High Energy Resolution Array at the 88 in. cyclotron of the Lawrence Berkeley Laboratory. The {sup 168}Yb nucleus was produced in the reaction {sup 48}Ca({sup 124}Sn,4n) at 210 MeV. Five bands previously reported were confirmed; additionally, four other bands, two extending to spins as high as 36 {Dirac_h} were observed. Cranked shell models suggest that one of the new bands can be interpreted as the continuation of the ground state band (above the AB crossing frequency) crossing into the four-quasiparticle band ABCD at about 0.38 MeV. Both relative alignment and Routhians are in good agreement with the experimental values. However, these calculations were done at constant pairing strength, which is not expected to be good at high rotational frequencies where one or more crossings have occurred in each band. Particle-hole calculations (with no pairing) were done for {sup 168}Yb as well as for other N {approx_equal} 98 nuclei for which good experimental data are available. In most cases, it is possible to associate a particle-hole configuration for each band observed at very high rotational frequencies, and the overall description is good. At frequencies  More>>
Authors:
Oliveira, J R.B.; [1]  Stephens, F S; Deleplanque, M A; Diamond, R M; [2]  Draper, J E; Rubel, E; Duyar, C; [3]  Beacker, J A; Henry, E A; Roy, N; [4]  Beausang, C W; [5]  Frauendorf, S [6] 
  1. Sao Paulo Univ., SP (Brazil)
  2. Lawrence Berkeley Lab., CA (United States)
  3. California Univ., Davis, CA (United States)
  4. Lawrence Livermore National Lab., CA (United States)
  5. Liverpool Univ. (United Kingdom)
  6. Institut fur Kern und Hadronen Physik, F2-Rossendorf, Dresden (Germany)
Publication Date:
Aug 01, 1992
Product Type:
Technical Report
Report Number:
AECL-10613(v.2); CONF-920548-; CONF-9205444-
Reference Number:
SCA: 663110; 663570; PA: AIX-28:057822; EDB-97:122559; SN: 97001841945
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; YTTERBIUM 168; HIGH SPIN STATES; PAIRING INTERACTIONS; ALIGNED COUPLING SCHEME; CALCIUM 48 REACTIONS; CRANKING MODEL; EXPERIMENTAL DATA; GAMMA SPECTROSCOPY; HEAVY ION FUSION REACTIONS; NUCLEAR STRUCTURE; PARTICLE-HOLE MODEL; ROTATIONAL STATES; SHELL MODELS; TIN 124 TARGET
OSTI ID:
520583
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: CA9700488057822
Availability:
INIS; OSTI as DE97638960
Submitting Site:
INIS
Size:
pp. 230-234
Announcement Date:

Citation Formats

Oliveira, J R.B., Stephens, F S, Deleplanque, M A, Diamond, R M, Draper, J E, Rubel, E, Duyar, C, Beacker, J A, Henry, E A, Roy, N, Beausang, C W, and Frauendorf, S. High-spin spectroscopy of {sup 168}Yb and the reduction of pairing correlations. Canada: N. p., 1992. Web.
Oliveira, J R.B., Stephens, F S, Deleplanque, M A, Diamond, R M, Draper, J E, Rubel, E, Duyar, C, Beacker, J A, Henry, E A, Roy, N, Beausang, C W, & Frauendorf, S. High-spin spectroscopy of {sup 168}Yb and the reduction of pairing correlations. Canada.
Oliveira, J R.B., Stephens, F S, Deleplanque, M A, Diamond, R M, Draper, J E, Rubel, E, Duyar, C, Beacker, J A, Henry, E A, Roy, N, Beausang, C W, and Frauendorf, S. 1992. "High-spin spectroscopy of {sup 168}Yb and the reduction of pairing correlations." Canada.
@misc{etde_520583,
title = {High-spin spectroscopy of {sup 168}Yb and the reduction of pairing correlations}
author = {Oliveira, J R.B., Stephens, F S, Deleplanque, M A, Diamond, R M, Draper, J E, Rubel, E, Duyar, C, Beacker, J A, Henry, E A, Roy, N, Beausang, C W, and Frauendorf, S}
abstractNote = {The high spin states of {sup 168}Yb were investigated by means of in-beam gamma spectroscopy with the High Energy Resolution Array at the 88 in. cyclotron of the Lawrence Berkeley Laboratory. The {sup 168}Yb nucleus was produced in the reaction {sup 48}Ca({sup 124}Sn,4n) at 210 MeV. Five bands previously reported were confirmed; additionally, four other bands, two extending to spins as high as 36 {Dirac_h} were observed. Cranked shell models suggest that one of the new bands can be interpreted as the continuation of the ground state band (above the AB crossing frequency) crossing into the four-quasiparticle band ABCD at about 0.38 MeV. Both relative alignment and Routhians are in good agreement with the experimental values. However, these calculations were done at constant pairing strength, which is not expected to be good at high rotational frequencies where one or more crossings have occurred in each band. Particle-hole calculations (with no pairing) were done for {sup 168}Yb as well as for other N {approx_equal} 98 nuclei for which good experimental data are available. In most cases, it is possible to associate a particle-hole configuration for each band observed at very high rotational frequencies, and the overall description is good. At frequencies below the first crossing, a full pairing calculation is necessary to describe the bands properly. At intermediate frequencies, the pairing strength is believed to be intermediate. 3 figs.}
place = {Canada}
year = {1992}
month = {Aug}
}