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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2412.15898 |
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| _version_ | 1866916590007615488 |
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| author | Giha, N. P. Marin, S. Tolstukhin, I. A. Oberling, M. B. Knaack, R. A. Mueller-Gatermann, C. Korichi, A. Bhatt, K. Carpenter, M. P. Fougères, C. Karayonchev, V. Kay, B. P. Lauritsen, T. Seweryniak, D. Watwood, N. Duke, D. L. Mosby, S. Montoya, K. B. Connolly, D. S. Loveland, W. Hernandez, I. E. Clarke, S. D. Pozzi, S. A. Tovesson, F. |
| author_facet | Giha, N. P. Marin, S. Tolstukhin, I. A. Oberling, M. B. Knaack, R. A. Mueller-Gatermann, C. Korichi, A. Bhatt, K. Carpenter, M. P. Fougères, C. Karayonchev, V. Kay, B. P. Lauritsen, T. Seweryniak, D. Watwood, N. Duke, D. L. Mosby, S. Montoya, K. B. Connolly, D. S. Loveland, W. Hernandez, I. E. Clarke, S. D. Pozzi, S. A. Tovesson, F. |
| contents | We measure the average spin of $^{144}$Ba, a common fragment produced in $^{252}$Cf(sf), as a function of the total kinetic energy (TKE). We combined for the first time a twin Frisch-gridded ionization chamber with a world-class $γ$-ray spectrometer that was designed to measure high-multiplicity $γ$-ray events, Gammasphere. The chamber, loaded with a $^{252}$Cf(sf) source, provides a fission trigger, the TKE of the fragments, the approximate fragment masses, and the polar angle of the fission axis. Gammasphere provides the total $γ$-ray yield, fragment identification through the tagging of decay $γ$ rays, and the feeding of rotational bands in the fragments. We determine the dependence of the average spin of $^{144}$Ba on the fragments' TKE by correlating the fragment properties with the distribution of discrete levels that are fed. We find that the average spin only changes by about $0.5$ $\hbar$ across the TKE range of 158-203 MeV. The virtual independence of the spin on TKE suggests that spin is not solely generated through the statistical excitation of rotational modes, and more complex mechanisms are required. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_15898 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Meaurement of spin vs. TKE of $^{144}$Ba produced in spontaneous fission of $^{252}$Cf Giha, N. P. Marin, S. Tolstukhin, I. A. Oberling, M. B. Knaack, R. A. Mueller-Gatermann, C. Korichi, A. Bhatt, K. Carpenter, M. P. Fougères, C. Karayonchev, V. Kay, B. P. Lauritsen, T. Seweryniak, D. Watwood, N. Duke, D. L. Mosby, S. Montoya, K. B. Connolly, D. S. Loveland, W. Hernandez, I. E. Clarke, S. D. Pozzi, S. A. Tovesson, F. Nuclear Experiment We measure the average spin of $^{144}$Ba, a common fragment produced in $^{252}$Cf(sf), as a function of the total kinetic energy (TKE). We combined for the first time a twin Frisch-gridded ionization chamber with a world-class $γ$-ray spectrometer that was designed to measure high-multiplicity $γ$-ray events, Gammasphere. The chamber, loaded with a $^{252}$Cf(sf) source, provides a fission trigger, the TKE of the fragments, the approximate fragment masses, and the polar angle of the fission axis. Gammasphere provides the total $γ$-ray yield, fragment identification through the tagging of decay $γ$ rays, and the feeding of rotational bands in the fragments. We determine the dependence of the average spin of $^{144}$Ba on the fragments' TKE by correlating the fragment properties with the distribution of discrete levels that are fed. We find that the average spin only changes by about $0.5$ $\hbar$ across the TKE range of 158-203 MeV. The virtual independence of the spin on TKE suggests that spin is not solely generated through the statistical excitation of rotational modes, and more complex mechanisms are required. |
| title | Meaurement of spin vs. TKE of $^{144}$Ba produced in spontaneous fission of $^{252}$Cf |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2412.15898 |