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Title: Detailed spectroscopy of {sup 249}Fm

Abstract

Excited states in {sup 249}Fm were populated via the {alpha} decay of {sup 253}No and the subsequent decay was observed with the GABRIELA detection system installed at the focal plane of the VASSILISSA recoil separator. The energies, spins, and parities of these states could be established through combined {alpha},{gamma}, and conversion-electron spectroscopy. The first members of the ground-state rotational band were identified. Their excitation energies as well as the observation of a cross-over E2 transition confirm the assignment of 7/2{sup +}624 for the ground state of {sup 249}Fm. Two excited states were also observed and their decay properties suggest that they correspond to the particle excitation 9/2{sup -}734 and hole excitation 5/2{sup +}622. The analysis suggests that the 279-keV transition de-exciting the 9/2{sup -} state has anomalous E1 conversion coefficients.

Authors:
; ; ;  [1]; ; ; ; ; ; ; ; ; ; ; ;  [2]; ; ; ;  [3]
  1. CSNSM, IN2P3-CNRS, F-91405 Orsay Campus (France)
  2. FLNR, JINR, Dubna (Russian Federation)
  3. IPHC, IN2P3-CNRS, F-67037 Strasbourg (France)
Publication Date:
OSTI Identifier:
20863846
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 74; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.74.044303; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ALPHA DECAY; CONVERSION; E2-TRANSITIONS; ELECTRON SPECTROSCOPY; EXCITATION; FERMIUM 249; GROUND STATES; KEV RANGE; NOBELIUM 253; PARITY; PARTICLE-HOLE MODEL; RECOILS; ROTATIONAL STATES; SPIN

Citation Formats

Lopez-Martens, A, Hauschild, K, Briancon, Ch, Korichi, A, Yeremin, A V, Belozerov, A V, Chelnokov, M L, Chepigin, V I, Gorshkov, V A, Kabachenko, A P, Malyshev, O N, Oganessian, Yu Ts, Popeko, A G, Sagaidak, R N, Shutov, A V, Svirikhin, A I, Curien, D, Dorvaux, O, Gall, B, and Khalfallah, F. Detailed spectroscopy of {sup 249}Fm. United States: N. p., 2006. Web. doi:10.1103/PHYSREVC.74.044303.
Lopez-Martens, A, Hauschild, K, Briancon, Ch, Korichi, A, Yeremin, A V, Belozerov, A V, Chelnokov, M L, Chepigin, V I, Gorshkov, V A, Kabachenko, A P, Malyshev, O N, Oganessian, Yu Ts, Popeko, A G, Sagaidak, R N, Shutov, A V, Svirikhin, A I, Curien, D, Dorvaux, O, Gall, B, & Khalfallah, F. Detailed spectroscopy of {sup 249}Fm. United States. https://doi.org/10.1103/PHYSREVC.74.044303
Lopez-Martens, A, Hauschild, K, Briancon, Ch, Korichi, A, Yeremin, A V, Belozerov, A V, Chelnokov, M L, Chepigin, V I, Gorshkov, V A, Kabachenko, A P, Malyshev, O N, Oganessian, Yu Ts, Popeko, A G, Sagaidak, R N, Shutov, A V, Svirikhin, A I, Curien, D, Dorvaux, O, Gall, B, and Khalfallah, F. 2006. "Detailed spectroscopy of {sup 249}Fm". United States. https://doi.org/10.1103/PHYSREVC.74.044303.
@article{osti_20863846,
title = {Detailed spectroscopy of {sup 249}Fm},
author = {Lopez-Martens, A and Hauschild, K and Briancon, Ch and Korichi, A and Yeremin, A V and Belozerov, A V and Chelnokov, M L and Chepigin, V I and Gorshkov, V A and Kabachenko, A P and Malyshev, O N and Oganessian, Yu Ts and Popeko, A G and Sagaidak, R N and Shutov, A V and Svirikhin, A I and Curien, D and Dorvaux, O and Gall, B and Khalfallah, F},
abstractNote = {Excited states in {sup 249}Fm were populated via the {alpha} decay of {sup 253}No and the subsequent decay was observed with the GABRIELA detection system installed at the focal plane of the VASSILISSA recoil separator. The energies, spins, and parities of these states could be established through combined {alpha},{gamma}, and conversion-electron spectroscopy. The first members of the ground-state rotational band were identified. Their excitation energies as well as the observation of a cross-over E2 transition confirm the assignment of 7/2{sup +}624 for the ground state of {sup 249}Fm. Two excited states were also observed and their decay properties suggest that they correspond to the particle excitation 9/2{sup -}734 and hole excitation 5/2{sup +}622. The analysis suggests that the 279-keV transition de-exciting the 9/2{sup -} state has anomalous E1 conversion coefficients.},
doi = {10.1103/PHYSREVC.74.044303},
url = {https://www.osti.gov/biblio/20863846}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 4,
volume = 74,
place = {United States},
year = {Sun Oct 15 00:00:00 EDT 2006},
month = {Sun Oct 15 00:00:00 EDT 2006}
}