Nuclear level density and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>-ray strength function of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>43</mml:mn></mml:msup></mml:math>Sc

Bürger, A.; Larsen, A. C.; Hilaire, Stéphane; Guttormsen, M.; Harissopulos, S.; Kmiecik, M.; Konstantinopoulos, T.; Krtička, M.; Lagoyannis, A.; Lönnroth, T.; Mazurek, K.; Norrby, M.; Nyhus, H. T.; Perdikakis, G.; Siem, S.; Spyrou, A.; Syed, N. U. H.

doi:10.1103/physrevc.85.064328

Cited by 28 publications

(12 citation statements)

References 30 publications

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“…This low-energy enhancement or upbend has been seen in a wide mass range of nuclei, including 60,64 Ni [30][31][32][33][34][35][36][37][38][39][40][41]. The physical mechanisms underlying this upbend are still not well understood, and theoretical investigations propose different interpretations.…”

Section: Introductionmentioning

confidence: 99%

“…The application of the Oslo method led to the experimental discovery of the upbend, first seen in 56,57 Fe [30]. Later, it was used to prove the presence of an upbend in nuclei such as [43][44] Sc [34,35], 50,51 V [36], and 64 Ni [37], among others. Recently, variations of the Oslo method have allowed for the study of the NLD and γ SF in more neutron-rich nuclei via the analysis of experimental data , and first-generation (c) coincidence matrices for 65 Ni from the 64 Ni(d,pγ ) 65 Ni reaction.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the γ decay of Ni65 from particle- γ coincidence data

et al. 2017

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The γ decay of 65 Ni has been studied from particle-γ coincidence data on the 64 Ni(d,pγ ) 65 Ni reaction. γ -ray spectra at excitation energies below E x ≈ 2 MeV have been studied and compared with previous measurements. Coincidences corresponding to E x ≈ 4.4-6.1 MeV have been used to constrain the shape of the nuclear level density and γ -strength function of 65 Ni by means of the Oslo method. The experimental γ -strength function presents an enhancement at γ energies below E γ ≈ 3 MeV. In addition, a resonance-like structure centered at E γ ≈ 4.6 MeV is seen together with accumulated strength at E γ ≈ 2.6-3.6 MeV. The obtained results contribute to the systematic study of γ decay in the Ni isotopes, which is of great interest for the understanding of both single-particle and collective nuclear structure phenomena.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating the γ decay of Ni65 from particle- γ coincidence data

et al. 2017

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“…In previous analyses of [43][44][45] Sc [2,3], [44][45][46] Ti [4][5][6], 50,51 V [7], 56,57 Fe [8], and 93-98 Mo [9] isotopes using the Oslo method, an unexpected enhancement in the γ -ray strength was discovered at low γ energies, i.e., E γ < 4 MeV. This low-energy enhancement was recently supported by results from a different experimental approach for 95 Mo [10], which gives confidence to the results of the Oslo method.…”

Section: Introductionmentioning

confidence: 99%

Pygmy resonance and low-energy enhancement in theγ-ray strength functions of Pd isotopes

et al. 2014

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Background: An unexpected enhancement in the γ -ray strength function, as compared to the low-energy tail of the giant dipole resonance (GDR), has been observed for Sc, Ti, V, Fe, and Mo isotopes for E γ < 4 MeV. This enhancement was not observed in subsequent analyses on Sn isotopes, but a pygmy dipole resonance (PDR) centered at E γ ≈ 8 MeV was however detected. The γ -ray strength functions measured for Cd isotopes exhibit both features over the range of isotopes, with the low-energy enhancement decreasing and PDR strength increasing as a function of neutron number. This suggests a transitional region for the onset of low-energy enhancement, and also that the PDR strength depends on the number of neutrons. Purpose: The γ -ray strength functions of 105-108 Pd have been measured in order to further explore the proposed transitional region. Method: Experimental data were obtained at the Oslo Cyclotron Laboratory by using the charged particle reactions ( 3 He, 3 He γ ) and ( 3 He, αγ ) on 106,108 Pd target foils. Particle-γ coincidence measurements provided information on initial excitation energies and the corresponding γ -ray spectra, which were used to extract the level densities and γ -ray strength functions according to the Oslo method. Results: The γ -ray strength functions indicate a sudden increase in magnitude for E γ > 4 MeV, which is interpreted as a PDR centered at E γ ≈ 8 MeV. An enhanced γ -ray strength at low energies is also observed for 105 Pd, which is the lightest isotope measured in this work. Conclusions: A PDR is clearly identified in the γ -ray strength functions of 105-108 Pd, and a low-energy enhancement is observed for 105 Pd. Further, the results correspond and agree very well with the observations from the Cd isotopes, and support the suggested transitional region for the onset of low-energy enhancement with decreasing mass number. The neutron number dependency of the PDR strength is also evident.

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“…One of the most surprising features observed in the γ -strength function is the increased probability of γ decay with γ energies below 2-4 MeV, first seen in 56,57 Fe in 2004 [11]. Since then, this low-energy enhancement or upbend has been measured for several nuclei from Sc to Sm [11][12][13][14][15][16][17][18][19] and confirmed with an independent method for 95 Mo [20]. The physical mechanisms underlying this enhancement are still not clarified.…”

Section: Introductionmentioning

confidence: 99%

Statistical γ -decay properties of Ni64 and deduced ( n,γ ) cross section of the
Campo
¹
,
Garrote
²
,
Eriksen
³

et al. 2016
Phys. Rev. C
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Particle-γ coincidence data have been analyzed to obtain the nuclear level density and the γ -strength function of 64 Ni by means of the Oslo method. The level density found in this work is in very good agreement with known energy levels at low excitation energies as well as with data deduced from particle-evaporation measurements at excitation energies above E x ≈ 5.5 MeV. The experimental γ -strength function presents an enhancement at γ energies below E γ ≈ 3 MeV and possibly a resonancelike structure centered at E γ ≈ 9.2 MeV. The obtained nuclear level density and γ -strength function have been used to estimate the (n,γ ) cross section for the s-process branch-point nucleus 63 Ni, of particular interest for astrophysical calculations of elemental abundances.

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Nuclear level density andγ-ray strength function of43Sc

Cited by 28 publications

References 30 publications

Investigating the γ decay of Ni65 from particle- γ coincidence data

Investigating the γ decay of Ni65 from particle- γ coincidence data

Pygmy resonance and low-energy enhancement in theγ-ray strength functions of Pd isotopes

Statistical γ -decay properties of Ni64 and deduced ( n,γ ) cross section of the
Campo
¹
,
Garrote
²
,
Eriksen
³

et al. 2016
Phys. Rev. C
Self Cite

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Nuclear level density andγ-ray strength function of43Sc

Cited by 28 publications

References 30 publications

Investigating the γ decay of Ni65 from particle- γ coincidence data

Investigating the γ decay of Ni65 from particle- γ coincidence data

Pygmy resonance and low-energy enhancement in theγ-ray strength functions of Pd isotopes

Statistical γ -decay properties of Ni64 and deduced ( n,γ ) cross section of the Campo1, Garrote2, Eriksen3 et al. 2016Phys. Rev. CSelf Cite

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Statistical γ -decay properties of Ni64 and deduced ( n,γ ) cross section of the
Campo
¹
,
Garrote
²
,
Eriksen
³

et al. 2016
Phys. Rev. C
Self Cite