Abstract
The γ -ray strength function and level density of 111, 112, 113 Sn are being studied at the Oslo Cyclotron Laboratory (OCL) up to the neutron binding energy by applying the Oslo method to particle-γ coincidence data. The preliminary results for the γ -ray strength function are discussed in the context of the results for the more neutron-rich Sn-isotopes previously studied at OCL.
Highlights
The level density (LD) as a function of excitation energy is a fruitful concept for describing the nuclear structure of atomic nuclei in the quasi-continuum and above while the average electromagnetic decay properties of the nucleus are described by the γ-strength function (GSF)
Additional strength for the γ-ray energies lying in the region 5-8 MeV has been observed for several nuclei [1]. This strength is called pygmy dipole resonance (PDR) and the dependence of the properties of the pygmy resonance on the neutron number has been investigated at the Oslo cyclotron laboratory (OCL) previously for 116119,121,122Sn [2]
For all three data sets Eγ ! 1500 keV is set as the lower limit. It is the first γ rays emitted in the cascades that are of primary interest
Summary
The level density (LD) as a function of excitation energy is a fruitful concept for describing the nuclear structure of atomic nuclei in the quasi-continuum and above while the average electromagnetic decay properties of the nucleus are described by the γ-strength function (GSF). Additional strength for the γ-ray energies lying in the region 5-8 MeV has been observed for several nuclei [1]. This strength is called pygmy dipole resonance (PDR) and the dependence of the properties of the pygmy resonance on the neutron number has been investigated at the Oslo cyclotron laboratory (OCL) previously for 116119,121,122Sn [2].
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