Photoneutron reactions on ¹⁶⁵Ho and ¹⁶⁹Tm in the giant dipole resonance region

@misc{gheorghe2026photoneutron,
  title = {{Photoneutron reactions on $^165$Ho and $^169$Tm in the giant dipole resonance region}},
  author = {I. Gheorghe and S. Goriely and K. Stopani and S. Belyshev and M. Krzysiek and D. Filipescu and H. Wang and G. Fan and L. Liu and H. Scheit and D. Symochko and T. Aumann and T. Renstrøm and G. M. Tveten and F. Furmyr and A. Görgen and A. C. Larsen and S. Siem and V. Orlin and T. Ari-izumi and S. Miyamoto and H. Utsunomiya},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.25984},
  eprint = {2609.25984},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.25984},
}

TY  - UNPB
TI  - Photoneutron reactions on ^165Ho and ^169Tm in the giant dipole resonance region
AU  - I. Gheorghe
AU  - S. Goriely
AU  - K. Stopani
AU  - S. Belyshev
AU  - M. Krzysiek
AU  - D. Filipescu
AU  - H. Wang
AU  - G. Fan
AU  - L. Liu
AU  - H. Scheit
AU  - D. Symochko
AU  - T. Aumann
AU  - T. Renstrøm
AU  - G. M. Tveten
AU  - F. Furmyr
AU  - A. Görgen
AU  - A. C. Larsen
AU  - S. Siem
AU  - V. Orlin
AU  - T. Ari-izumi
AU  - S. Miyamoto
AU  - H. Utsunomiya
PY  - 2026
DA  - 2026/09/22
PB  - arXiv
DO  - 10.48550/arxiv.2609.25984
UR  - https://arxiv.org/abs/2609.25984
AB  - Photoneutron reactions were investigated for the deformed ^165Ho and ^169Tm nuclei from the vicinity of the neutron emission threshold up to ∼40~MeV, well above the giant dipole resonance (GDR) region, using quasimonochromatic laser Compton scattering γ-ray beams provided at the NewSUBARU facility, Japan. A high-and-flat efficiency moderated array of ^3He counters was used for the neutron detection and an associated neutron multiplicity sorting method for extracting the (γ, 1nX), (γ, 2nX), (γ, 3nX) and (γ, 4nX) reaction cross sections and average neutron emission energies. The present ^165Ho cross sections were compared to existing data, revealing discrepancies with the Saclay multiplicity sorting results and an overall 10% strength difference with the Livermore ones. There are no other data for ^169Tm. GDR parameters based on phenomenological Lorentzian models were extracted by fitting the present σ(γ, Sn) data with adjustments for the missing contribution of charged-particle-only reactions not observed experimentally. For both nuclei we observed high energy structures at 20-25~MeV, matching giant quadrupole resonance KMFR predictions. Based on the present centroid energies of the first and second GDR peaks, hydrodynamic model predictions gave intrinsic electric quadrupole moments of +7.00(34)~b and +7.38(28)~b for the ground states of ^165Ho and ^169Tm, respectively. The present experimental excitation functions and photoneutron energies were compared to statistical model calculations. Using the EMPIRE code, we performed a sensitivity test to phenomenological models of photon strength functions and nuclear level densities. The TALYS code was used to reproduce the present experimental (γ, inX) cross sections and average neutron energies using microscopic nuclear level density models.
ER  -