Proton single-particle states in the heaviest actinide nuclei

I. Ahmad; F. G. Kondev; E. F. Moore; R. R. Chasman; M. P. Carpenter; J. P. Greene; R. V.F. Janssens; T. Lauritsen; C. J. Lister; D. Seweryniak; R. W. Hoff; J. E. Evans; R. W. Lougheed; C. E. Porter; L. K. Felker

doi:10.1063/1.1905319

Proton single-particle states in the heaviest actinide nuclei

I. Ahmad, F. G. Kondev, E. F. Moore, R. R. Chasman, M. P. Carpenter, J. P. Greene, R. V.F. Janssens, T. Lauritsen, C. J. Lister, D. Seweryniak, R. W. Hoff, J. E. Evans, R. W. Lougheed, C. E. Porter, L. K. Felker

National Isotope Development Center

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

The level structure of ²⁴⁹Bk has been investigated by measuring the γ-ray spectra following the α decay of a chemically and isotopically pure ²⁵³Es sample. Alpha-gamma coincidence measurement was performed using a Si detector for α particles and a 25% Ge detector for γ 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 γ rays produced in the β^- 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(α,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 7/2 ⁺[633]⊗1^-9/2^-, 7/2⁺[633] ⊗0^-7/2^-, 7/2⁺[633]⊗1 ^-5/2^- and 7/2⁺[633]⊗0 ⁺7/2⁺, respectively.

Original language	English
Title of host publication	NUCLEI AT THE LIMITS
Pages	251-256
Number of pages	6
DOIs	https://doi.org/10.1063/1.1905319
State	Published - Apr 5 2005
Event	Nuclei at the Limits - Argonne, IL, United States Duration: Jul 26 2004 → Jul 30 2004

Publication series

Name	AIP Conference Proceedings
Volume	764
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	Nuclei at the Limits
Country/Territory	United States
City	Argonne, IL
Period	07/26/04 → 07/30/04

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10.1063/1.1905319

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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. (2005). Proton single-particle states in the heaviest actinide nuclei. In NUCLEI AT THE LIMITS (pp. 251-256). (AIP Conference Proceedings; Vol. 764). https://doi.org/10.1063/1.1905319

@inproceedings{bc618fee9bcc491fb0f2a813f90cd532,

title = "Proton single-particle states in the heaviest actinide nuclei",

abstract = "The level structure of 249Bk has been investigated by measuring the γ-ray spectra following the α decay of a chemically and isotopically pure 253Es sample. Alpha-gamma coincidence measurement was performed using a Si detector for α particles and a 25% Ge detector for γ 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 γ rays produced in the β- 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(α,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 7/2 +[633]⊗1-9/2-, 7/2+[633] ⊗0-7/2-, 7/2+[633]⊗1 -5/2- and 7/2+[633]⊗0 +7/2+, respectively.",

author = "I. Ahmad 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 T. Lauritsen and Lister, {C. J.} and D. Seweryniak and Hoff, {R. W.} and Evans, {J. E.} and Lougheed, {R. W.} and Porter, {C. E.} and Felker, {L. K.}",

year = "2005",

month = apr,

day = "5",

doi = "10.1063/1.1905319",

language = "English",

isbn = "0735402493",

series = "AIP Conference Proceedings",

pages = "251--256",

booktitle = "NUCLEI AT THE LIMITS",

note = "Nuclei at the Limits ; Conference date: 26-07-2004 Through 30-07-2004",

}

Ahmad, I, Kondev, FG, Moore, EF, Chasman, RR, Carpenter, MP, Greene, JP, Janssens, RVF, Lauritsen, T, Lister, CJ, Seweryniak, D, Hoff, RW, Evans, JE, Lougheed, RW, Porter, CE & Felker, LK 2005, Proton single-particle states in the heaviest actinide nuclei. in NUCLEI AT THE LIMITS. AIP Conference Proceedings, vol. 764, pp. 251-256, Nuclei at the Limits, Argonne, IL, United States, 07/26/04. https://doi.org/10.1063/1.1905319

TY - GEN

T1 - Proton single-particle states in the heaviest actinide nuclei

AU - Ahmad, I.

AU - Kondev, F. G.

AU - Moore, E. F.

AU - Chasman, R. R.

AU - Carpenter, M. P.

AU - Greene, J. P.

AU - Janssens, R. V.F.

AU - Lauritsen, T.

AU - Lister, C. J.

AU - Seweryniak, D.

AU - Hoff, R. W.

AU - Evans, J. E.

AU - Lougheed, R. W.

AU - Porter, C. E.

AU - Felker, L. K.

PY - 2005/4/5

Y1 - 2005/4/5

N2 - The level structure of 249Bk has been investigated by measuring the γ-ray spectra following the α decay of a chemically and isotopically pure 253Es sample. Alpha-gamma coincidence measurement was performed using a Si detector for α particles and a 25% Ge detector for γ 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 γ rays produced in the β- 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(α,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 7/2 +[633]⊗1-9/2-, 7/2+[633] ⊗0-7/2-, 7/2+[633]⊗1 -5/2- and 7/2+[633]⊗0 +7/2+, respectively.

AB - The level structure of 249Bk has been investigated by measuring the γ-ray spectra following the α decay of a chemically and isotopically pure 253Es sample. Alpha-gamma coincidence measurement was performed using a Si detector for α particles and a 25% Ge detector for γ 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 γ rays produced in the β- 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(α,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 7/2 +[633]⊗1-9/2-, 7/2+[633] ⊗0-7/2-, 7/2+[633]⊗1 -5/2- and 7/2+[633]⊗0 +7/2+, respectively.

UR - http://www.scopus.com/inward/record.url?scp=33748995965&partnerID=8YFLogxK

U2 - 10.1063/1.1905319

DO - 10.1063/1.1905319

M3 - Conference contribution

AN - SCOPUS:33748995965

SN - 0735402493

SN - 9780735402492

T3 - AIP Conference Proceedings

SP - 251

EP - 256

BT - NUCLEI AT THE LIMITS

T2 - Nuclei at the Limits

Y2 - 26 July 2004 through 30 July 2004

ER -

Proton single-particle states in the heaviest actinide nuclei

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