Fermi’s golden rule applied to the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>γ</mml:mi></mml:mrow></mml:math>decay in the quasicontinuum of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Ti</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>46</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

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

doi:10.1103/physrevc.83.014312

Cited by 23 publications

(24 citation statements)

References 21 publications

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“…The main assumption of the first-generation method is that the γ-ray spectrum from a bin of excited states are independent of the population mechanism of these states. This means that the γ-spectrum obtained from the direct reaction into states at excitation energy E is similar to the Comparison between the experimental P(E i , E γ ) matrix (squares) of 46 Ti and fitted spectra from one common ρ(E) and T (E γ ) [6].…”

Section: Methodssupporting

confidence: 64%

“…[6][7][8]. The charged ejectiles are used to tag the excitation energies for each γ-ray spectrum from the ground state and up to the neutron separation energy.…”

Section: Methodsmentioning

confidence: 99%

“…04004-p.7 In order to study the variations in the γ-SF with excitation energy, we introduce here a new approach [6]. By accepting one common level density, we may investigate the transmission coefficient in detail, and thus the validity of the Brink hypothesis.…”

Section: Cnr*11mentioning

confidence: 99%

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Do light nuclei display a universalγ-ray strength function?

Guttormsen

Larsen

Bürger

et al. 2012

EPJ Web of Conferences

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Abstract. In this work we focus on properties in the quasi-continuum of light nuclei.Generally, both level density and γ-ray strength function (γ-SF) differ from nucleus to nucleus. In order to investigate this closer, we have performed particle-γ coincidences using the reactions (p, p ), (p, d) and (p, t) on a 46 Ti target. In particular, the very rich data set of the 46 Ti(p, p ) 46 Ti inelastic scattering reaction allows analysis of the coincidence data for many independent data sets. Using the Oslo method, we find one common level density for all data sets. If transitions to well-separated low-energy levels are included, the deduced γ-SF may change by a factor of 2 − 3, due strong to Porter-Thomas fluctuations. However, a universal γ-SF with small fluctuations is found provided that only excitation energies above 3 MeV are taken into account. The nuclear structure of the titaniums is discussed within a combinatorial quasi-particle model, showing that only few Nilsson orbitals participate in building up the level density for these light nuclei.

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Section: Methodssupporting

confidence: 64%

“…[6][7][8]. The charged ejectiles are used to tag the excitation energies for each γ-ray spectrum from the ground state and up to the neutron separation energy.…”

Section: Methodsmentioning

confidence: 99%

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Do light nuclei display a universalγ-ray strength function?

Guttormsen

Larsen

Bürger

et al. 2012

EPJ Web of Conferences

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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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“…Recent measurements on the γ-strength function of several nuclei in the Fe-Mo mass region have revealed an unexpected enhancement for low γ energies (E γ ≤ 3 − 4 MeV) [1][2][3][4][5]. However, no such feature was seen in the heavier Sn isotopes [6,7] or in the rare-earth region [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Transitionalγstrength in Cd isotopes

et al. 2013

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The level densities and γ-ray strength functions of 105,106,111,112 Cd have been extracted from particle-γ coincidence data using the Oslo method. The level densities are in very good agreement with known levels at low excitation energy. The γ-ray strength functions display no strong enhancement for low γ energies. However, more low-energy strength is apparent for 105,106 Cd than for 111,112 Cd. For γ energies above ≈ 4 MeV, there is evidence for some extra strength, similar to what has been previously observed for the Sn isotopes. The origin of this extra strength is unclear; it might be due to E1 and M1 transitions originating from neutron skin oscillations or the spin-flip resonance, respectively.

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Fermi’s golden rule applied to theγdecay in the quasicontinuum ofTi46

Cited by 23 publications

References 21 publications

Do light nuclei display a universalγ-ray strength function?

Do light nuclei display a universalγ-ray strength function?

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

Transitionalγstrength in Cd isotopes

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