The pygmy quadrupole resonance and neutron-skin modes in Sn-124

The pygmy quadrupole resonance and neutron-skin modes in Sn-124
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Sn-124 中的侏儒四极共振和中子趋肤模式

DOI:
10.1016/j.physletb.2015.11.004
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发表时间:
2016
期刊:
影响因子:
4.4
通讯作者:
A. Zilges
A. Zilges
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. Spieker;N. Tsoneva;V. Derya;J. Endres;D. Savran;M.N. Harakeh;S. Harissopulos;R.-D. Herzberg;A. Lagoyannis;H. Lenske;N. Pietralla;L. Popescu;M. Scheck;F. Schlüter;K. Sonnabend;V.I. Stoica;H.J. Wörtche;A. Zilges

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我们提出了一个广泛的实验研究,最近预测的侏儒四极共振(PQR)在锡同位素,其中使用互补探针。在本研究中,对124 Sn进行了(α,α′ γ)和(γ,γ′)实验。在这两个反应中,J π= 2+态低于5 MeV的激发能填充。在(γ,γ′)实验中可以提取出在整个跃迁密度上积分的E2强度,而(α,α′ γ)实验在选定的运动学条件下,由于核内部强的α粒子吸收,强烈地倾向于表面模的激发。这种模式的激发是根据四极型振荡的中子皮肤预测的微观方法的基础上自洽密度泛函理论和准粒子声子模型(QPM)。新测定的γ衰变分支比暗示了E2强度的非统计特征,正如最近在侏儒偶极共振(PDR)的情况下指出的那样。这使我们能够区分PQR型和多声子激发,因此,支持最近的第一个实验指示的PQR在124锡。
We present an extensive experimental study of the recently predicted pygmy quadrupole resonance (PQR) in Sn isotopes, where complementary probes were used. In this study,(α, α′ γ) and (γ, γ′) experiments were performed on 124 Sn. In both reactions, J π= 2+ states below an excitation energy of 5 MeV were populated. The E2 strength integrated over the full transition densities could be extracted from the (γ, γ′) experiment, while the (α, α′ γ) experiment at the chosen kinematics strongly favors the excitation of surface modes because of the strong α-particle absorption in the nuclear interior. The excitation of such modes is in accordance with the quadrupole-type oscillation of the neutron skin predicted by a microscopic approach based on self-consistent density functional theory and the quasiparticle-phonon model (QPM). The newly determined γ-decay branching ratios hint at a non-statistical character of the E2 strength, as it has also been recently pointed out for the case of the pygmy dipole resonance (PDR). This allows us to distinguish between PQR-type and multiphonon excitations and, consequently, supports the recent first experimental indications of a PQR in 124 Sn.
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