Extraction of level density and γ strength function from primary γ spectra

Abstract

We present a new iterative procedure to extract the level density and the γ strength function from primary γ spectra for energies close up to the neutron binding energy. The procedure is tested on simulated spectra and on data from the 173 Yb( 3 He,α) 172 Yb reaction.

Photon Strength Functions at the Low-Energy Tail of GEDR

“…Functions ρ(E b ) and f (E γ ) can be determined by an iterative procedure [19]. But decomposition of P(E a , E γ ) into ρ(E b ) and f (E γ ) is not unique.…”

Nuclear level density: Shell-model approach

“…Then the task is to predict the level density of the system at higher excitation energy, in the region beyond direct measurements resolving individual quantum states. Practically, the relevant factual milestones, apart from the low-lying spectroscopy, are the regions of isolated neutron resonances near neutron separation energy and the results of the Oslo method and related experimental approaches [1][2][3][4]. Of course, any practical shell-model Hamiltonian loses its validity outside of the truncated orbital space where this Hamiltonian was expected to work.…”

Level Densities andγStrength Functions in Light Sc and Ti Isotopes

“…The excited nuclei will emit cascades of γ rays to decay to their ground states. The energy spectra of these γ rays were measured in coincidence with the particles, and matrices E x vs. E γ was constructed after correcting for the NaI response function as described in [1]. The first-generation method [2] was then applied on this matrix to extract a matrix P containing the spectrum of primary γ-ray energies E γ for each initial excitation energy E x .…”

“…To determine absolute values for the level density and the strength function, data from other experiments have to be utilized. The procedure is described in detail in [1] and the articles referenced therein.…”