Constraints on the dipole photon strength functions from experimental multistep cascade spectra
Constraints on the dipole photon strength functions from experimental multistep cascade spectra
复制标题
实验多步级联光谱对偶极子光子强度函数的约束
作者：
M. Krticka;S. Goriely;S. Hilaire;S. Péru;S. Valenta
覆盖整个核图的光子强度函数（PSF）的可行理论预测对于不同的核应用（特别是核天体物理学）具有很大的意义。最近，提出了一种由轴向变形 Hartree-Fock-Bogolyubov (HFB) + 准粒子随机相位近似 (QRPA) 计算以及 D1M Gogny 相互作用和唯象低能贡献组成的全局 PSF 模型。在本文中，我们根据之前发布的使用 DANCE 探测器进行孤立共振中子捕获后的多级 γ 级联测量数据来测试该模型的预测。这些数据对 PSF 模型进行了严格的测试，特别是 M1 剪刀模式的特性和可能的低能量 PSF 增强。对球形、准球形和变形良好的原子核的共振获得的光谱进行了详细的比较。这一比较表明，HFB + QRPA 方法合理地描述了剪刀模态的位置和强度。此外，所有原子核中都应该存在低能量 PSF 贡献，而不是通过光吸收 PSF 的 HFB + QRPA 计算来预测。提出了在 M1 PSF 中假设的这种低能量贡献的系统学。
Viable theoretical predictions of photon strength functions (PSFs) covering the whole nuclear chart are of great interest for different nuclear applications, including, in particular, nuclear astrophysics. Recently, such a global PSF model consisting of axially deformed Hartree-Fock-Bogolyubov (HFB) + quasiparticle random phase approximation (QRPA) calculations with the D1M Gogny interaction and a phenomenological low-energy contribution was proposed. In the present paper, we test this model predictions against previously published data from measurements of multistep γ cascades following neutron capture on isolated resonances performed with the DANCE detector. Such data present a stringent test of the PSFs models, in particular for the properties of the M1 scissors mode and the possible low-energy PSFs enhancement. A detailed comparison is made for spectra obtained from resonances for spherical, quasispherical, and well-deformed nuclei. This comparison indicates that the location and strength of the scissors mode is reasonably described by the HFB + QRPA approach. Moreover, a low-energy PSF contribution, not predicted by the HFB + QRPA calculation of the photoabsorption PSF, should be present in all nuclei. A systematics of this low-energy contribution, assumed in the M1 PSF, is proposed.
自旋翻转共振区 Xe 128 和 Xe 134 的磁偶极子强度
影响因子：
3.1
作者：
R. Massarczyk;G. Rusev;R. Schwengner;F. Dönau;C. Bhatia;M.E. Gooden;J.H. Kelley;A.P. Tonchev;W. Tornow
通讯作者：
W. Tornow