Gamma-ray strength functions for A = 70–90 nuclei

Szeflińska, G.; Szefliński, Z.; Wilhelmi, Z.

doi:10.1016/0375-9474(79)90109-x

Cited by 43 publications

(21 citation statements)

References 28 publications

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“…3, based on the deexcitation modes and corroboration with the (p, y) and (3He, d) data [4,5,10]. One should notice that these values are in agreement with those given in the last A = 85 nuclear data compilation [16], with the exception of the 2429 keV level for which we assign (7/2 + , 9/2+).…”

Section: B Sey Level Schemesupporting

confidence: 73%

“…New information concerning the high spin states of this nucleus has been added since then [3]. Low-energy levels in ssy have been investigated through the (p, y) reaction [4], the (3He, d) reaction IS], as well as the sSgZr beta decay [6], whereas high-spin states were observed in heavy-ion fusion-evaporation reactions [%9]. The ~-y coincidence data of [6], performed on chemically separated Zr sources produced in the 89y + 70 MeV protons reactions, have been reinterpreted by Tepel [10], who introduced in the level scheme the 1/2-ground state, according to the (3He, d) data of Medsker et al [5].…”

Section: Introductionmentioning

confidence: 99%

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New investigation of83Zr and85Zr beta decay

Bucurescu

Rapaport

Liang

et al. 1992

Z. Physik A - Hadrons and Nuclei

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The decay of on-line mass separated 83Zr and SSZr sources has been studied by singles and coincident X-ray and ):-ray and conversion electron measurements. The previous level scheme of 83y is confirmed and 5 new levels have been added up to 2.74 MeV excitation. A decay scheme of 8~Zr with 40 levels up to 2.66 MeV in 8sy is deduced. The experimental observation below 2 MeV excitation in 85y agrees qualitatively with the predictions of the interacting boson-fermion model.

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Section: B Sey Level Schemesupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

New investigation of83Zr and85Zr beta decay

Bucurescu

Rapaport

Liang

et al. 1992

Z. Physik A - Hadrons and Nuclei

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“…A consistent set of (i) back-shifted Fermi gas (BSFG) [29] nuclear level densities, (ii) nucleon and (iii) γ-ray transmission coefficients was used also within the present analysis of the fast-neutron induced reactions on the stable isotopes of Zr. These parameters were established or validated on the basis of independent low-lying levels [30] and nucleon resonance data [31], (p, n) reaction cross sections [12], γ-ray strength functions [32][33][34][35] and (p, γ) reaction cross sections [12], respectively. The same OMP and level density parameters have been used in the framework of the DI, PE, and SM models.…”

Section: Nuclear Models and Parametersmentioning

confidence: 99%

“…There have been used in this respect the formerly measured RSFs for 89 Y and 90 Zr nuclei [32] and especially the more recent high-accuracy measurements at lower energies for 89 Y [33]. There are shown in Fig.…”

Section: γ-Ray Strength Functionsmentioning

confidence: 99%

Consistent optical potential for incident and emitted low-energy α particles. II. α emission in fast-neutron-induced reactions on Zr isotopes

Avrigeanu

2017

Phys. Rev. C

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Background: Challenging questions of the α-particle optical-model potential (OMP) are still pointed out by recent high-precision measurements of α-induced reaction data below the Coulomb barrier. Moreover, the reliability of a previous OMP for α-particles on nuclei within the mass number range 45≤A≤209 has been recently proved for emitted α particles as well, but only in the case of proton-induced reactions on Zn isotopes [Phys. Rev. C 91, 064611 (2015), Paper I].Purpose: Analysis of most recent (α, γ) reaction data for Ge and Zr isotopes, which provides an additional validation of the above-mentioned potential, is related to a further account of α-particle emission in neutron-induced reactions on Zr isotopes, at the same time with a suitable description of all competitive processes.Methods: A consistent parameter set, established or validated by independent analysis of recent various data, particularly γ-ray strength functions, have been involved within model calculation of the (α, γ) as well as (n, α) reaction cross sections. The latter are part of the whole analysis of the neutron activation of Zr isotopes, in order to avoid any error compensation or latent ambiguity. Results: The aforesaid potential provides a consistent description of recent α-induced reaction data with no empirical rescaling factors of the γ and/or nucleon widths. On the other hand, its use leads to underestimated predictions of the pre-equilibrium emission and statistical models for the (n, α) reaction cross sections.Conclusions: An optical potential with a volume imaginary component seems to be needed to describe the low-energy α-particle evaporation, while only surface absorption occurs in α-induced reactions at similar energies.

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“…In this respect, the PSF describes the average probability to absorb or emit a γ-ray of a given energy E γ . Reaction theory relates the PSF to the photoabsorption cross section that is known to be dominated by the electric dipole (E1) radiation, at least in the high γ-ray energy region of [10][11][12][13][14][15][16][17][18][19][20] MeV characterizing the well-known Giant Dipole Resonance (GDR) [1,6]. Outside this energy region, especially below the particle separation energies, the magnetic dipole (M1) contribution may become significant.…”

Section: Introductionmentioning

confidence: 99%

Reference database for photon strength functions

et al. 2019

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Photon strength functions describing the average response of the nucleus to an electromagnetic probe are key input information in the theoretical modelling of nuclear reactions. Consequently they are important for a wide range of fields such as nuclear structure, nuclear astrophysics, medical isotope production, fission and fusion reactor technologies. They are also sources of information for widely used reaction libraries such as the IAEA Reference Input Parameter Library and evaluated data files such as EGAF.arXiv:1910.06966v1 [nucl-ex] 15 Oct 2019 Fig. 1 (Color online) Schematic representation on how NLDs and PSFs are extracted from the primary γ-ray spectrum. The firstgeneration γ-ray distribution (yellow triangle) is given by the product of the level density ρ(E i − E γ ) and the γ-ray transmission coefficient T γ (E γ ). All values of the elements of the ρ(E i − E γ ) and T γ (E γ ) vectors are allowed to vary in order to give the best fit to the P(E γ , E i ) landscape.

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Gamma-ray strength functions for A = 70–90 nuclei

Cited by 43 publications

References 28 publications

New investigation of83Zr and85Zr beta decay

New investigation of83Zr and85Zr beta decay

Consistent optical potential for incident and emitted low-energy α particles. II. α emission in fast-neutron-induced reactions on Zr isotopes

Reference database for photon strength functions

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