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Low-energy enhancement in the γ-ray strength functions of Ge73,74

Renstrøm, Therese; Nyhus, Hilde-Therese; Utsunomiya, Hiroaki; Schwengner, Ronald; Goriely, Stephane; Larsen, Ann-Cecilie; Filipescu, Dan Mihai; Gheorghe, Ioana; Bernstein, L. A.; Bleuel, Darren L.; Glodariu, T.; Görgen, Andreas; Guttormsen, Magne Sveen; Hagen, Trine Wiborg; Kheswa, Bonginkosi Vincent; Lui, Y.-W.; Negi, Dinesh; Ruud, Inger Eli; Shima, T.; Siem, Sunniva; Takahisa, K.; Tesileanu, O.; Tornyi, Tamas Gabor; Tveten, Gry Merete; Wiedeking, Mathis
Journal article; PublishedVersion; Peer reviewed
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Renstrom_PhysRevC.93.064302.pdf (1.237Mb)
Year
2016
Permanent link
http://urn.nb.no/URN:NBN:no-69854

CRIStin
1363187

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  • CRIStin høstingsarkiv [8225]
  • Fysisk institutt [1714]
Original version
Physical Review C. Nuclear Physics. 2016, 93 (6):064302, DOI: http://dx.doi.org/10.1103/PhysRevC.93.064302
Abstract
The γ -ray strength functions and level densities of 73,74Ge have been extracted up to the neutron-separation energy Sn from particle-γ coincidence data using the Oslo method. Moreover, the γ -ray strength function of 74Ge above Sn has been determined from photoneutron measurements; hence these two experiments cover the range of Eγ ≈ 1–13 MeV for 74Ge. The obtained data show that both 73,74Ge display an increase in strength at low γ energies. The experimental γ -ray strength functions are compared with M1 strength functions deduced from average B(M1) values calculated within the shell model for a large number of transitions. The observed low-energy enhancements in 73,74Ge are adopted in the calculations of the 72,73Ge(n,γ ) cross sections, where there are no direct experimental data. Calculated reaction rates for more neutron-rich germanium isotopes are shown to be strongly dependent on the presence of the low-energy enhancement.
 
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