Cross-section measurements and thermonuclear reaction rates for 49Ti(p, γ)50V and 49Ti(p, n)49V

doi:10.1016/0375-9474(80)90683-1

Nuclear Physics A

Volume 344, Issue 2, 4 August 1980, Pages 351-360

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Abstract

The yield of γ-rays from the reaction ⁴⁹Ti(p, γ)⁵⁰V has been measured as a function of bombarding energy over the range 0.74–2.27 MeV and the yield of neutrons from the reaction ⁴⁹Ti(p, n)⁴⁹V has been measured from threshold to a bombarding energy of 3.25 MeV. Strong competition effects were observed in the γ-ray yield at the opening of the neutron channel. The energy dependence of these cross sections is compared with statistical-model calculations, and good agreement is achieved. Thermonuclear reaction rates are calculated for the temperature range 5 × 10⁸–5 × 10⁹ K which includes the range of temperatures of interest in nucleosysnthesis calculations. The effect of a strong isobaric analogue resonance on the (p, γ) thermonuclear reaction rate is identified and its importance is discussed.

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Cited by (16)

Nuclear Data Sheets for A = 50
2011, Nuclear Data Sheets
The experimental nuclear spectroscopic data for known nuclides of mass number 50 (Cl,Ar,K,Ca,Sc,Ti,V, Cr,Mn,Fe,Co,Ni) have been evaluated and presented together with Adopted properties for levels and γ rays. This evaluation has been carried out about 15 years after the previous one by Thomas Burrows (1995Bu29). Except for ⁵⁰Sc and ⁵⁰V, extensive new data have become available for all the other nuclides in the intervening years. The data for ⁵⁰Sc and ⁵⁰V have also been checked again in detail and several changes made. No data are yet available for excited states in ⁵⁰Cl, ⁵⁰Ar and ⁵⁰Ni. This work supersedes earlier evaluations (1995Bu29, 1990Bu18, 1984Al29, 1976Au07) of A=50 nuclides.
Nuclear Data Sheets update for A=50
1990, Nuclear Data Sheets
Nuclear Data Sheets for A=49
1986, Nuclear Data Sheets
The 1978 evaluation of A=49 (78Ha15) has been revised using experimental decay and reaction data received by the cutoff date noted below. See also 75Be56 and 76Ha07 for mass excess and deformation calculations relevant to the unobserved nuclides of ⁴⁹Co and ⁴⁹Ni.
Thermonuclear reaction rates: see 79Wo07 for calculations on the production of A=49 nuclei via α- and p-induced reactions and 83Sa30 for a study on the effects of excited states on the reaction rates.
Neutron-induced reaction data: see the bibliography CINDA-A, CINDA-B, and supplements.
Charged particle reaction cross sections and nucleosynthesis
1982, Physics Reports
The role of proton and α-particle induced reactions in carbon, neon, oxygen and silicon burning in massive stars is surveyed. The problems associated with determining thermonuclear reaction rates for reactions with widely spaced resonances and with closely spaced or overlapping resonances are discussed and the associated experimental approaches are reviewed. Experimental techniques which have been used in the measurement of reaction cross sections are discussed and their strengths and weaknesses are identified. Recent developments in attempts to establish reliable statistical-model codes for calculation of reaction cross sections are presented and discussed. Finally, the results of experimental tests of statistical model codes are summarised and evaluated.
Cross sections and thermonuclear reaction rates for 42Ca(p, γ)43Sc, 44Ca(p, γ) 45Sc, 44Ca(p, n) 44Sc and 45Sc(p, n)45Ti
1982, Nuclear Physics, Section A
The yield of γ-rays from the reaction ⁴²Ca(p, γ)⁴³Sc has been measured as a function of bombarding energy over the range 0.63–3.01 MeV, from ⁴⁴Ca(p, γ)⁴⁵Sc over the range 0.775–4.00 MeV, from ⁴²Ca(p, p'γ)⁴²Ca over the range 2.24–3.01 MeV, and from ⁴⁴Ca(p, p'γ)⁴⁴Ca over the range 1.90–5.03 MeV. The cross section of the reaction ⁴⁴Ca(p, n)⁴⁴Sc has been measured from threshold to a bombarding energy of 5.05 MeV by observation of the 1157 keV γ-ray associated with the residual ⁴⁴Sc activity, and the cross section of the reaction ⁴⁵Sc(p, n)⁴⁵Ti has been measured from threshold to a bombarding energy of 4.00 MeV both by observation of the annihilation radiation associated with the residual ⁴⁵Ti activity and by measurement of the total neutron yield with a wide-angle BF₃ tube and paraffin detector. All these data are compared with statisticalmodel calculations and satisfactory agreement is achieved. Thermonuclear reaction rates for the (p, γ) and (p, n) reactions are calculated for the temperature range 5 × 10⁸-10¹⁰K and the significance of these results for explosive nucleosynthesis in stars is discussed.
Thermonuclear reaction rates for proton induced reactions on 41K and neutron induced reactions on 41Ca
1982, Nuclear Physics, Section A
The yield of γ-rays from the reaction ⁴¹K(p, γ)⁴²Ca has been measured as a function of bombarding energy over the range 0.68–2.48 MeV and from the reaction ⁴¹K(p, αγ)³⁸Ar over the range 1.20–2.48 MeV, and the yield of neutrons from the reaction ⁴¹K(p, n)⁴¹Ca has been measured from threshold to a bombarding energy of 2.48 MeV. The energy dependence of the cross sections is compared with statistical-model calculations with global optical-model parameters in all particle channels. The calculations seriously overestimate the cross section for the neutron channel and underestimate those for the other channels. A reduction in the imaginary well depth in the neutron channel leads to good agreement with all the data. Statistical-model calculations with this modified set of parameters are then carried out to provide cross sections for the astrophysically interesting reactions ⁴¹Ca(n, p)⁴¹K, ⁴¹Ca(n, α)³⁸Ar, and ⁴¹Ca(n, γ)⁴²Ca. Thermonuclear reaction rates are calculated for all six reactions over the temperature range 5 × 10⁸–10¹⁰K which includes the range of temperatures of interest in nucleosynthesis calculations.

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^☆: Supported in part by the Australian Research Grants Committee (B77/15413).

^††: Queen Elizabeth II Fellow. Present address: Kodak Research Laboratories. Coburg, Victoria 3058, Australia.

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Nuclear Physics A

Abstract

References (11)

Nucl. Data Sheets

Nucl. Data Sheets

Atomic Data and Nucl. Data Tables

Atomic Data and Nucl. Data Tables

Astrophys. J.

Cited by (16)

Nuclear Data Sheets for A = 50

Nuclear Data Sheets update for A=50

Nuclear Data Sheets for A=49

Charged particle reaction cross sections and nucleosynthesis

Cross sections and thermonuclear reaction rates for <sup>42</sup>Ca(p, γ)<sup>43</sup>Sc, <sup>44</sup>Ca(p, γ) <sup>45</sup>Sc, <sup>44</sup>Ca(p, n) <sup>44</sup>Sc and <sup>45</sup>Sc(p, n)<sup>45</sup>Ti

Thermonuclear reaction rates for proton induced reactions on <sup>41</sup>K and neutron induced reactions on <sup>41</sup>Ca

Cross-section measurements and thermonuclear reaction rates for 49Ti(p, γ)50V and 49Ti(p, n)49V☆

Abstract

Nucl. Data Sheets

Nucl. Data Sheets

Atomic Data and Nucl. Data Tables

Atomic Data and Nucl. Data Tables

Astrophys. J.

Cross-section measurements and thermonuclear reaction rates for ⁴⁹Ti(p, γ)⁵⁰V and ⁴⁹Ti(p, n)⁴⁹V☆