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Photo-induced population of the h11/2 isomeric states in (γ, n) reactions

Publication ,  Conference
Angell, CT; Karwowski, HJ; Kelley, JH; Tonchev, AP; Tornow, W
Published in: AIP Conference Proceedings
March 13, 2006

The mechanism of excitation of isomeric h11/2 states in nuclei around the closed shell at N=82 have been studied at the High-Intensity Gamma Source (HIγS). We have taken advantage of the monoenergetic (ΔE/E=1.5%) and pulsed γ-ray-beam from HIγS to perform in-beam spectroscopy measurements with an improved level of precision and sensitivity. The giant dipole resonances at 15 MeV in the N=82 target isotones 138Ba, 140Ce, and 142Nd have been excited, and following neutron emission the γ-ray cascades leading to the isomeric h11/2 state and the ground state were observed in the N=81 isotones. For all three nuclei a very similar de-excitation scheme was found. The only level observed from which the isomeric state was populated was found to be Jπ = 7/2-. The ground state is principally populated from the states with spin and parities Jπ = 1/2+, 5/2+, and 7/2+. The structure of the N=81 isotones and the role of the gateway states in isomer population will be discussed. The results of the measurements will be compared with statistical model calculations. © 2006 American Institute of Physics.

Duke Scholars

Published In

AIP Conference Proceedings

DOI

EISSN

1551-7616

ISSN

0094-243X

ISBN

9780735403130

Publication Date

March 13, 2006

Volume

819

Start / End Page

363 / 367
 

Citation

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Angell, C. T., Karwowski, H. J., Kelley, J. H., Tonchev, A. P., & Tornow, W. (2006). Photo-induced population of the h11/2 isomeric states in (γ, n) reactions. In AIP Conference Proceedings (Vol. 819, pp. 363–367). https://doi.org/10.1063/1.2187885
Angell, C. T., H. J. Karwowski, J. H. Kelley, A. P. Tonchev, and W. Tornow. “Photo-induced population of the h11/2 isomeric states in (γ, n) reactions.” In AIP Conference Proceedings, 819:363–67, 2006. https://doi.org/10.1063/1.2187885.
Angell CT, Karwowski HJ, Kelley JH, Tonchev AP, Tornow W. Photo-induced population of the h11/2 isomeric states in (γ, n) reactions. In: AIP Conference Proceedings. 2006. p. 363–7.
Angell, C. T., et al. “Photo-induced population of the h11/2 isomeric states in (γ, n) reactions.” AIP Conference Proceedings, vol. 819, 2006, pp. 363–67. Scopus, doi:10.1063/1.2187885.
Angell CT, Karwowski HJ, Kelley JH, Tonchev AP, Tornow W. Photo-induced population of the h11/2 isomeric states in (γ, n) reactions. AIP Conference Proceedings. 2006. p. 363–367.
Journal cover image

Published In

AIP Conference Proceedings

DOI

EISSN

1551-7616

ISSN

0094-243X

ISBN

9780735403130

Publication Date

March 13, 2006

Volume

819

Start / End Page

363 / 367