Primary<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>-ray spectra in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>44</mml:mn></mml:msup></mml:math>Ti of astrophysical interest

Larsen, A. C.; Goriely, Stéphane; Bürger, A.; Guttormsen, M.; Görgen, A.; Harissopulos, S.; Kmiecik, M.; Konstantinopoulos, T.; 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.85.014320

Cited by 15 publications

(2 citation statements)

References 40 publications

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“…Therefore, it could well be that our phenomenological model fit in the region E γ ≈ 7 − 12 MeV underestimates the true strength for 51 Ti. An upbend of the γSF is observed at low γ-ray energies similar to previous investigations in nearby Ti and Fe isotopes [76][77][78]. To describe the γSF below E γ = 4 MeV an exponential form f M 1 upbend = C exp (−ηE γ ) is used and is assumed to be M1 in character based on shell model studies of the Ti isotopes [79] and the shell model calculations presented later.…”

Section: Data Analysis and Extraction Of Level Density And γ-Raysupporting

confidence: 61%

Benchmarking the extraction of statistical neutron capture cross sections on short-lived nuclei for applications using the β -Oslo method

Liddick¹,

Larsen²,

Guttormsen³

et al. 2019

Phys. Rev. C

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Numerous scientific fields including astrophysics, nuclear power, and nuclear forensics require a knowledge of basic nuclear properties for large numbers of short-lived, radioactive isotopes far removed from stable nuclei. Neutron-capture cross sections are one such piece of nuclear data where direct measurements are not possible and theoretical predictions can vary by orders of magnitude. A recently developed indirect technique for inferring neutron capture rates, the β-Oslo method, has been introduced but not compared against a known, directly measured neutron capture cross section. To provide this benchmark, two indirect methods based on β decay and charged-particle reactions were used to extract the nuclear level density and γ-ray strength function of 51 Ti. The nuclear level density and γ-ray strength function from the two data sets were found to be equivalent and were used to extract the neutron capture cross section of 50 Ti which agrees with previous direct measurements at high neutron energies. The results demonstrate the validity of the β-Oslo method for extracting neutron capture cross sections of short-lived nuclei and provide a sufficiently small uncertainty to be used in various applications.

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Section: Data Analysis and Extraction Of Level Density And γ-Raysupporting

confidence: 61%

Benchmarking the extraction of statistical neutron capture cross sections on short-lived nuclei for applications using the β -Oslo method

Liddick¹,

Larsen²,

Guttormsen³

et al. 2019

Phys. Rev. C

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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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Excited Nuclear States for Ti-44 (Titanium)

Sukhoruchkin¹,

Soroko²

2015

Supplement to I/25 a-E

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Primaryγ-ray spectra in44Ti of astrophysical interest

Cited by 15 publications

References 40 publications

Benchmarking the extraction of statistical neutron capture cross sections on short-lived nuclei for applications using the β -Oslo method

Benchmarking the extraction of statistical neutron capture cross sections on short-lived nuclei for applications using the β -Oslo method

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

Excited Nuclear States for Ti-44 (Titanium)

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