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Title: Proton Single-Particle States In The Heaviest Actinide Nuclei

Abstract

The level structure of 249Bk has been investigated by measuring the {gamma}-ray spectra following the {alpha} decay of a chemically and isotopically pure 253Es sample. Alpha-gamma coincidence measurement was performed using a Si detector for {alpha} particles and a 25% Ge detector for {gamma} rays. A gamma-gamma coincidence measurement was performed with the Gammasphere spectrometer. The Es sample was obtained by extracting the 253Es which grew in a 253Cf source material produced in the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. Additional information on the 249Bk levels was obtained from the study of {gamma} rays produced in the {beta}- decay of 249Cm. The 249Cm sample was produced by neutron irradiation of 248Cm. Using the results of the present study and the results of previous 248Cm({alpha},t) and 248Cm(3He,d) reaction spectra, the following single-particle states have been identified in 249Bk: 7/2+[633], 0.0 keV; 3/2-[521], 8.78 keV; 1/2+[400], 377.55 keV: 5/2+[642], 389.17 keV; 1/2-[530], 569.19 keV; 1/2-[521], 643.0 keV; 5/2-[523], 672.8 keV; 9/2+[624], 1075.1 keV. Four vibrational bands were identified at 767.9, 932.2, 1150.7 and 1223.0 keV with tentative assignments of {l_brace}7/2+[633]x1-{r_brace}9/2-, {l_brace}7/2+[633]x0-{r_brace}7/2-, {l_brace}7/2+[633]x1-{r_brace}5/2- and {l_brace}7/2+[633]x0+{r_brace}7/2+, respectively.

Authors:
; ; ; ; ; ; ; ; ;  [1]; ; ;  [2]; ;  [3]
  1. Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  2. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
  3. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
Publication Date:
OSTI Identifier:
20630848
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 764; Journal Issue: 1; Conference: Conference on nuclei at the limits, Argonne, IL (United States), 26-30 Jul 2004; Other Information: DOI: 10.1063/1.1905319; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA DECAY; ALPHA PARTICLES; BERKELIUM 249; BETA DECAY; CALIFORNIUM 253; CURIUM 248; CURIUM 249; EINSTEINIUM 253; GAMMA RADIATION; GAMMA SPECTRA; GE SEMICONDUCTOR DETECTORS; HFIR REACTOR; KEV RANGE; NEUTRON REACTIONS; NEUTRONS; ORNL; PROTONS; SINGLE-PARTICLE MODEL; VIBRATIONAL STATES

Citation Formats

Ahmad, I, Kondev, F G, Moore, E F, Chasman, R R, Carpenter, M P, Greene, J P, Janssens, R V.F., Lauritsen, T, Lister, C J, Seweryniak, D, Hoff, R W, Evans, J E, Lougheed, R W, Porter, C E, and Felker, L K. Proton Single-Particle States In The Heaviest Actinide Nuclei. United States: N. p., 2005. Web. doi:10.1063/1.1905319.
Ahmad, I, Kondev, F G, Moore, E F, Chasman, R R, Carpenter, M P, Greene, J P, Janssens, R V.F., Lauritsen, T, Lister, C J, Seweryniak, D, Hoff, R W, Evans, J E, Lougheed, R W, Porter, C E, & Felker, L K. Proton Single-Particle States In The Heaviest Actinide Nuclei. United States. https://doi.org/10.1063/1.1905319
Ahmad, I, Kondev, F G, Moore, E F, Chasman, R R, Carpenter, M P, Greene, J P, Janssens, R V.F., Lauritsen, T, Lister, C J, Seweryniak, D, Hoff, R W, Evans, J E, Lougheed, R W, Porter, C E, and Felker, L K. 2005. "Proton Single-Particle States In The Heaviest Actinide Nuclei". United States. https://doi.org/10.1063/1.1905319.
@article{osti_20630848,
title = {Proton Single-Particle States In The Heaviest Actinide Nuclei},
author = {Ahmad, I and Kondev, F G and Moore, E F and Chasman, R R and Carpenter, M P and Greene, J P and Janssens, R V.F. and Lauritsen, T and Lister, C J and Seweryniak, D and Hoff, R W and Evans, J E and Lougheed, R W and Porter, C E and Felker, L K},
abstractNote = {The level structure of 249Bk has been investigated by measuring the {gamma}-ray spectra following the {alpha} decay of a chemically and isotopically pure 253Es sample. Alpha-gamma coincidence measurement was performed using a Si detector for {alpha} particles and a 25% Ge detector for {gamma} rays. A gamma-gamma coincidence measurement was performed with the Gammasphere spectrometer. The Es sample was obtained by extracting the 253Es which grew in a 253Cf source material produced in the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory. Additional information on the 249Bk levels was obtained from the study of {gamma} rays produced in the {beta}- decay of 249Cm. The 249Cm sample was produced by neutron irradiation of 248Cm. Using the results of the present study and the results of previous 248Cm({alpha},t) and 248Cm(3He,d) reaction spectra, the following single-particle states have been identified in 249Bk: 7/2+[633], 0.0 keV; 3/2-[521], 8.78 keV; 1/2+[400], 377.55 keV: 5/2+[642], 389.17 keV; 1/2-[530], 569.19 keV; 1/2-[521], 643.0 keV; 5/2-[523], 672.8 keV; 9/2+[624], 1075.1 keV. Four vibrational bands were identified at 767.9, 932.2, 1150.7 and 1223.0 keV with tentative assignments of {l_brace}7/2+[633]x1-{r_brace}9/2-, {l_brace}7/2+[633]x0-{r_brace}7/2-, {l_brace}7/2+[633]x1-{r_brace}5/2- and {l_brace}7/2+[633]x0+{r_brace}7/2+, respectively.},
doi = {10.1063/1.1905319},
url = {https://www.osti.gov/biblio/20630848}, journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 764,
place = {United States},
year = {Tue Apr 05 00:00:00 EDT 2005},
month = {Tue Apr 05 00:00:00 EDT 2005}
}