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Title: Table of superdeformed nuclear bands and fission isomers

Abstract

A minimum in the second potential well of deformed nuclei was predicted and the associated shell gaps are illustrated in the harmonic oscillator potential shell energy surface calculations shown in this report. A strong superdeformed minimum in {sup 152}Dy was predicted for {beta}{sub 2}-0.65. Subsequently, a discrete set of {gamma}-ray transitions in {sup 152}DY was observed and, assigned to the predicted superdeformed band. Extensive research at several laboratories has since focused on searching for other mass regions of large deformation. A new generation of {gamma}-ray detector arrays is already producing a wealth of information about the mechanisms for feeding and deexciting superdeformed bands. These bands have been found in three distinct regions near A=l30, 150, and 190. This research extends upon previous work in the actinide region near A=240 where fission isomers were identified and also associated with the second potential well. Quadrupole moment measurements for selected cases in each mass region are consistent with assigning the bands to excitations in the second local minimum. As part of our committment to maintain nuclear structure data as current as possible in the Evaluated Nuclear Structure Reference File (ENSDF) and the Table of Isotopes, we have updated the information on superdeformed nuclearmore » bands. As of April 1994, we have complied data from 86 superdeformed bands and 46 fission isomers identified in 73 nuclides for this report. For each nuclide there is a complete level table listing both normal and superdeformed band assignments; level energy, spin, parity, half-life, magneto moments, decay branchings; and the energies, final levels, relative intensities, multipolarities, and mixing ratios for transitions deexciting each level. Mass excess, decay energies, and proton and neutron separation energies are also provided from the evaluation of Audi and Wapstra.« less

Authors:
 [1];  [2]
  1. Lawrence Berkeley Lab., CA (United States)
  2. McMaster Univ., Hamilton, ON (Canada)
Publication Date:
Research Org.:
Lawrence Berkeley Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States); Natural Sciences and Engineering Research Council of Canada, Ottawa, ON (Canada)
OSTI Identifier:
10193446
Report Number(s):
LBL-35916
ON: DE95002653; TRN: 94:023893
DOE Contract Number:
AC03-76SF00098
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: Jun 1994
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; DEFORMED NUCLEI; NUCLEAR STRUCTURE; ENERGY-LEVEL TRANSITIONS; FISSION PRODUCTS; NUCLEAR DEFORMATION; NUCLEAR DATA COLLECTIONS; COMPILED DATA; ISOMERS; HALF-LIFE; 663110; 663470; GENERAL AND AVERAGE PROPERTIES OF NUCLEI AND NUCLEAR ENERGY LEVELS; FISSION

Citation Formats

Firestone, R.B., and Singh, B.. Table of superdeformed nuclear bands and fission isomers. United States: N. p., 1994. Web. doi:10.2172/10193446.
Firestone, R.B., & Singh, B.. Table of superdeformed nuclear bands and fission isomers. United States. doi:10.2172/10193446.
Firestone, R.B., and Singh, B.. Wed . "Table of superdeformed nuclear bands and fission isomers". United States. doi:10.2172/10193446. https://www.osti.gov/servlets/purl/10193446.
@article{osti_10193446,
title = {Table of superdeformed nuclear bands and fission isomers},
author = {Firestone, R.B. and Singh, B.},
abstractNote = {A minimum in the second potential well of deformed nuclei was predicted and the associated shell gaps are illustrated in the harmonic oscillator potential shell energy surface calculations shown in this report. A strong superdeformed minimum in {sup 152}Dy was predicted for {beta}{sub 2}-0.65. Subsequently, a discrete set of {gamma}-ray transitions in {sup 152}DY was observed and, assigned to the predicted superdeformed band. Extensive research at several laboratories has since focused on searching for other mass regions of large deformation. A new generation of {gamma}-ray detector arrays is already producing a wealth of information about the mechanisms for feeding and deexciting superdeformed bands. These bands have been found in three distinct regions near A=l30, 150, and 190. This research extends upon previous work in the actinide region near A=240 where fission isomers were identified and also associated with the second potential well. Quadrupole moment measurements for selected cases in each mass region are consistent with assigning the bands to excitations in the second local minimum. As part of our committment to maintain nuclear structure data as current as possible in the Evaluated Nuclear Structure Reference File (ENSDF) and the Table of Isotopes, we have updated the information on superdeformed nuclear bands. As of April 1994, we have complied data from 86 superdeformed bands and 46 fission isomers identified in 73 nuclides for this report. For each nuclide there is a complete level table listing both normal and superdeformed band assignments; level energy, spin, parity, half-life, magneto moments, decay branchings; and the energies, final levels, relative intensities, multipolarities, and mixing ratios for transitions deexciting each level. Mass excess, decay energies, and proton and neutron separation energies are also provided from the evaluation of Audi and Wapstra.},
doi = {10.2172/10193446},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jun 01 00:00:00 EDT 1994},
month = {Wed Jun 01 00:00:00 EDT 1994}
}

Technical Report:

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  • As part of a committment to maintain nuclear structure data as current as possible in the Evaluated Nuclear Structure Data File (ENSDF) and the Table of Isotopes, the author have been updating the information on superdeformed and hyperdeformed nuclear bands. As of February, 1996, they have compiled data for 161 superdeformed bands and 47 fission isomers identified in 93 nuclides for this publication. This is an increase of 75 superdeformed bands and 20 new nuclides since the first edition in 1994. Partial data for superdeformed bands and fission isomers are shown in the band drawings. For each nuclide there ismore » a complete level table listing both normal (taken from the ENSDF file) and superdeformed band assignments; level energy, spin, parity, half-life, magnetic moments, decay branchings; and the energies, final levels, relative intensities, multipolarities, and mixing ratios for transitions deexciting each level. Mass excess, decay energies, and proton and neutron separation energies are also provided from the evaluation of Audi and Wapstra. For superdeformed and hyperdeformed bands they provide the following quantities: level energies; level half-lives; level spins; and gamma ray energies.« less
  • The Table of Superdeformed Nuclear Bands and Fission Isomers contains all experimental data on the nuclear structure of superdeformed bands published through October, 2002. Level schemes, moment of inertia plots, and data tables are presented. A complete reference list is provided.
  • The neutron-induced fission cross section of /sup 243/Cm was measured from 15 eV to 3 MeV in a time-of-flight experiment which used the intense, single-pulse neutron source provided by the underground nuclear explosion Physics-8 and a 240-m, evacuated flight path. The cross section reported here has been channelized into 1 ..mu..s bins. Typical uncertainties for each data point are +-10 percent nonsystematic and +-10 percent systematic.
  • One of the major challenges in the study of superdeformation is to directly connect the large number of superdeformed bands now known to the yrast states. In this way, excitation energies, spins and parities can be assigned to the levels in the second well which is essential to establish the collective and single-particle components of these bands. This paper will review some of the progress which has been made to understand the decay of superdeformed bands using the new arrays including the measurement of the total decay spectrum and the establishment of direct one-step decays from the superdeformed band tomore » the yrast line in {sup 194}Hg. 42 refs., 5 figs.« less