Prompt gamma rays of terbium emitted after (n,nʹγ) inelastic scattering reactions induced by irradiation of a terbium(III) hexahydrate (TbCl₃·6H₂O) sample with a beam of fission neutrons were investigated with the instrument FaNGaS (Fast Neutron-induced Gamma-ray Spectrometry) at an angle of 90° between neutron beam and detector. At sample position, the fast-neutron flux was 1.13 × 10⁸ cm⁻² s⁻¹ and the neutron beam has an average energy of 2.30 MeV. We identified 124 prompt gamma lines from the ¹⁵⁹Tb(n,nʹγ)¹⁵⁹Tb reaction. Presence of prompt gamma rays from oxygen and chlorine was used for a concise verification of recently published results. Relative gamma-ray intensities, effective cross sections and fast-neutron spectrum-averaged partial production cross sections of the gamma lines are given including comparisons with available literature data. We found a reasonable agreement and the multitude of unreported lines adds decisive value to nuclear spectroscopy. Additionally, we estimated the detection limit of terbium as 1 mg for a counting time of 12 h.

用裂变中子束照射六水铽(III) (TbCl ₃ ·6H ₂ O)样品引起(n,nʹγ)非弹性散射反应后发射的铽瞬发伽马射线，用FaNGaS（快中子-中子束和探测器之间呈 90° 角的感应伽马射线光谱法。在样品位置，快中子通量为1.13×10 ⁸  cm ^-2  s ^-1，中子束的平均能量为2.30 MeV。我们从¹⁵⁹ Tb(n,nʹγ) ¹⁵⁹ Tb 反应中鉴定出 124 条瞬发伽马线。来自氧气和氯的瞬发伽马射线的存在被用来对最近发表的结果进行简明验证。给出了伽马射线的相对伽马射线强度、有效截面和快中子谱平均部分生产截面，包括与现有文献数据的比较。我们找到了合理的一致性，并且大量未报告的谱线为核光谱学增加了决定性的价值。此外，我们估计计数时间为 12 小时时铽的检测限为 1 mg。