Speaker
Description
H. S. Haug1, S. Marin2, N. P. Giha2,3, J. N. Wilson4, I. A. Tolstukhin3, A. Al-Adili1,5, D.Gjestvang1, S. Siem1
1 Department of Physics, University of Oslo, N-0316 Oslo, Norway
2 Department of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, Michigan 48109, USA
3 Physics Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
4 Universit´e Paris-Saclay, CNRS/IN2P3, IJC Laboratory, Orsay, France
5 Department of Physics and Astronomy, Uppsala University, Uppsala 75120, Sweden
In nuclear fission, a heavy nucleus normally splits into two fission fragments. Fragments are typically created with about 6-7 ¯h of angular momentum on average [1]. The fragment spin directions relative to the fission axis are not well understood, with the only available data from 1976 by A. Wolf and E. Cheifetz [2]. The angular distributions of γ rays give with respect to the fission axis give us experimental information about spin directions. In this work, we present measurements of the angular distributions of discrete γ rays in fission fragments from spontaneous fission of 252Cf. The data were taken at Argonne National Laboratory with the Gammasphere spectrometer. The set up combined a twin Frisch-gridded ionization chamber, which gives fission fragment mass, kinetic energy and directions, together with the Compton-suppressed high-purity germanium (HPGe) detector array Gammasphere that provides high-granularity, high-resolution γ-ray energy measurements [3]. Around 2.5·109 fission events wert recorded over 180 h of experiment. This set-up allows accurate measurements of gamma ray angular distributions with respect to the fission axis.
References
[1] J. N. Wilson, D. Thisse, M. Lebois, N. Jovancevic, D. Gjestvang, and et al., “Angular momentum generation in nuclear fission,” Nature (London), vol. 590, no. 7847, pp. 566–570, 2021.
[2] A. Wolf and E. Cheifetz, “Angular distributions of specific gamma rays emitted in the deexcitation of prompt fission products of 252Cf,” Phys. Rev. C, vol. 13, pp. 1952–1960, May 1976.
[3] N. P. Giha, S. Marin, I. A. Tolstukhin, M. B. Oberling, R. A. Knaack, C. Mueller-Gatermann, A. Korichi, K. Bhatt, M. P. Carpenter, C. Foug`eres, V. Karayonchev, B. P. Kay, T. Lauritsen, D. Seweryniak, N. Watwood, D. L. Duke, S. Mosby, K. B. Montoya, D. S. Connolly, W. Loveland, I. E. Hernandez, S. D. Clarke, S. A. Pozzi, and F. Tovesson, “Measurement of spin versus total kinetic energy of 144Ba produced
in spontaneous fission of 252Cf,” Phys. Rev. C, vol. 111, p. 014605, Jan 2025.
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