The flux-weighted average cross sections of \(^{\mathrm {nat}}\hbox {In}(\upgamma ,x\hbox {n}\)) reactions and isomeric yield ratios of \(^{112\mathrm {m,g}}\hbox {In}\), \(^{111\mathrm {m,g}}\hbox {In}\), and \(^{110\mathrm {m,g}}\hbox {In}\) were measured with the bremsstrahlung end-point energies of 50, 60, and 70 MeV using an activation and off-line \(\upgamma \)-ray spectrometric technique at the Pohang Accelerator Laboratory (PAL), Korea. It was observed that the average cross sections of the \(^{\mathrm {nat}}\hbox {In}(\upgamma ,\hbox {xn})\) reactions increase with bremsstrahlung energy up to the Gaint Dipole Resonance (GDR) region. Thereafter, it shows a small decrease trend with bremsstrahlung energy due to the opening of another reaction channel. The isomeric yield ratios of same product in the \((\upgamma ,\hbox {n})\), (n,2n), (p,x), (\(\upalpha ,\hbox {x})\), and \((^{{3}}\hbox {He},\hbox {x})\) reactions for various targets show that the spin of the target nucleus plays a vital role besides the effect of excitation energy and input angular momentum in determining the isomeric yield ratios.

\（^ {\ mathrm {nat}} \ hbox {In}（\ upgamma，x \ hbox {n} \））反应的通量加权平均截面和\（^ {112 \ mathrm { m，g}} \ hbox {In} \），\（^ {111 \ mathrm {m，g}} \ hbox {In} \）和\（^ {110 \ mathrm {m，g}} \ hbox在韩国浦项加速器实验室（PAL）使用激活和离线\（upgamma \）射线光谱技术，用the，stra，end，end，Me，Me，Me，Me，Me，Me，Me测量了{In} \。观察到\（^ {\ mathrm {nat}} \ hbox {In}（\ upgamma，\ hbox {xn}）\）的平均横截面随着致辐射能量的增加，反应达到Gaint Dipole Resonance（GDR）区域。此后，由于打开了另一个反应通道，它随致辐射能量显示出较小的下降趋势。\（（\ upgamma，\ hbox {n}）\），（n，2n），（p，x），（\（\ upalpha，\ hbox {x}）\）中相同产品的异构体产率，以及针对各种目标的\（（^ {{3}} \ hbox {He}，\ hbox {x}）\）反应表明，目标核的自旋除了激发能量和输入角的影响外，还起着至关重要的作用。确定异构体收率的动量。