Cross sections for proton-induced reactions on Pd isotopes at energies relevant for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>process

Dillmann, I.; Coquard, L.; Domingo‐Pardo, C.; Käppeler, F.; Marganiec, J.; Uberseder, E.; Giesen, U.; Heiske, A.; Feinberg, G.; Hentschel, D.; Hilpp, S.; Leiste, H.; Rauscher, T.; Thielemann, Friedrich‐Karl

doi:10.1103/physrevc.84.015802

Cited by 32 publications

(16 citation statements)

References 43 publications

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“…Our new values agree with the earlier experimental results of (Khandaker et al, 2010) above 35 MeV, and agree well with the TENDL predictions. Also the agreement with the data of (Ditrói et al, 2007) is good while the few low energy point of (Dillmann et al, 2011) are compatible with the data of (Khandaker et al, 2010).…”

Section: Radioisotopes Of Silversupporting

confidence: 86%

Activation cross sections of proton induced nuclear reactions on palladium up to 80 MeV

Tárkányi

Ditrói

Takács

et al. 2016

Applied Radiation and Isotopes

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Activation cross sections of proton induced nuclear reactions on palladium were measured up to 80 MeV by using the stacked foil irradiation technique and gamma ray spectrometry. The beam intensity, the incident energy and the energy degradation were controlled by a method based on flux constancy via normalization to the excitation functions of monitor reactions measured in parallel. Excitation functions for direct and cumulative cross-sections were measured for the production of 104m,104g,105g,106m,110m Ag, 100,101 Pd, 99m,99g,100,101m,101g,102m,102g,105 Rh and 103,97 Ru radioisotopes. The cross section data were compared with the theoretical predictions of TENDL-2014 and -2015 libraries. For practical applications thick target yields were derived from the measured excitation functions. Application in the field of medical radionuclide production is shortly discussed.

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Section: Radioisotopes Of Silversupporting

confidence: 86%

Activation cross sections of proton induced nuclear reactions on palladium up to 80 MeV

Tárkányi

Ditrói

Takács

et al. 2016

Applied Radiation and Isotopes

View full text Add to dashboard Cite

show abstract

“…This method makes it possible to investigate besides the total cross section the partial cross section for the direct population of several states in 75 As. This is an advantage compared to the widely used activation technique [28][29][30][31][32][33], which was not applicable anyway since the reaction product 75 As is stable.…”

Section: The Reactionmentioning

confidence: 99%

Investigation of the reaction74Ge(p,γ)75
Sauerwein
¹
,
Endres
²
,
Netterdon
³

et al. 2012
Phys. Rev. C
Self Cite
36
4
40
0
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Background: Astrophysical models studying the origin of the neutron-deficient p nuclides require the knowledge of proton capture cross sections at low energy. The production site of the p nuclei is still under discussion but a firm basis of nuclear reaction rates is required to address the astrophysical uncertainties. Data at astrophysically relevant interaction energies are scarce. Problems with the prediction of charged particle capture cross sections at low energy were found in the comparisons between previous data and calculations in the Hauser-Feshbach statistical model of compound reactions.Purpose: A measurement of 74 Ge(p,γ) 75 As at low proton energies, inside the astrophysically relevant energy region, is important in several respects. The reaction is directly important as it is a bottleneck in the reaction flow which produces the lightest p nucleus 74 Se. It is also an important addition to the data set required to test reaction-rate predictions and to allow an improvement in the global p+nucleus optical potential required in such calculations.Method: An in-beam experiment was performed, making it possible to measure in the range 2.1 ≤ Ep ≤ 3.7 MeV, which is for the most part inside the astrophysically relevant energy window. Angular distributions of the γ-ray transitions were measured with high-purity germanium detectors at eight angles relative to the beam axis. In addition to the total cross sections, partial cross sections for the direct population of twelve levels were determined. Results:The resulting cross sections were compared to Hauser-Feshbach calculations using the code SMARAGD. Only a constant renormalization factor of the calculated proton widths allowed a good reproduction of both total and partial cross sections. The accuracy of the calculation made it possible to check the spin assignment of some states in 75 As. In the case of the 1075 keV state, a double state with spins and parities of 3/2 − and 5/2 − is needed to explain the experimental partial cross sections. A change in parity from 5/2 + to 5/2 − is required for the state at 401 keV. Furthermore, in the case of 74 Ge, studying the combination of total and partial cross sections made it possible to test the γ width, which is essential in the calculation of the astrophysical 74 As(n,γ) 75 As rate. Conclusions:Between data and statistical model prediction a factor of about two was found. Nevertheless, the improved astrophysical reaction rate of 74 Ge(p,γ) (and its reverse reaction) is only 28% larger than the previous standard rate. The prediction of the 74 As(n,γ) 75 As rate (and its reverse) was confirmed, the newly calculated rate differs only by a few percent from the previous prediction. The in-beam method with high efficiency detectors proved to be a powerful tool for studies in nuclear astrophysics and nuclear structure.

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“…Up to now, the activation technique has been the most widely used method to measure absolute reaction cross sections for charged-particle induced reactions [13][14][15][16][17][18][19]. In addition, the 4jr-summing technique is available for the in vestigation of certain a-and proton-capture reactions [20,21 ].…”

Section: Introductionmentioning

confidence: 99%

Total and partial cross sections of theSn112(α,γ)Te116
Netterdon
¹
,
Mayer
²
,
Scholz
³

et al. 2015
Phys. Rev. C
30
0
31
0
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Background:The nucleosynthesis of the neutron-deficient p nuclei remains an open question in nuclear astrophysics. Beside uncertainties on the astrophysical side, the nuclear-physics input parameters entering Hauser-Feshbach calculations for the nucleosynthesis of the p nuclei must be put on a firm basis. Purpose: An extended database of experimental data is needed to address uncertainties of the nuclear-physics input parameters for Hauser-Feshbach calculations. Especially a-(-nucleus optical model potentials at low energies are not well known. The in-beam technique with an array of high-purity germanium (HPGe) detectors was successfully applied to the measurement of absolute cross sections of an (a,y ) reaction on a heavy nucleus at sub-Coulomb energies. Method: The total and partial cross-section values were measured by means of in-beam y -ray spectroscopy. For this purpose, the absolute reaction yield was measured using the HPGe detector array HORUS at the FN tandem accelerator at the University of Cologne. Total and partial cross sections were measured at four different a-particle energies from Ea -10.5 MeV to Ea = 12 MeV. Results: The measured total cross-section values are in excellent agreement with previous results obtained with the activation technique, which proves the validity of the applied method. With the present measurement, the discrepancy between two older data sets is removed. The experimental data was compared to Hauser-Feshbach calculations using the nuclear reaction code TALYS. With a modification of the semi-microscopic a + nucleus optical model potential OMP 3, the measured cross-section values are reproduced well. Moreover, partial cross sections could be measured for the first time for an (a , y ) reaction. Conclusions: A modified version of the semimicroscopic a + nucleus optical model potential OMP3, as well as modified proton and y widths, are needed in order to obtain a good agreement between experimental data and theory. It is found that a model using a local modification of the nuclear-physics input parameters simultaneously reproduces total cross sections of the ll2Sn(a,y) and ll2Sn(a,p) reactions. The measurement of partial cross sections turns out to be very important in this case in order to apply the correct y-ray strength function in the Hauser-Feshbach calculations. The model also reproduces cross-section values of a-induced reactions on l06Cd, as well as of (a.n) reactions on 1 l5 ll6Sn, hinting at a more global character of the obtained nuclear-physics input.

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Cross sections for proton-induced reactions on Pd isotopes at energies relevant for theγprocess

Abstract: Proton-activation reactions on natural and enriched palladium samples were investigated via the activation technique in the energy range of Ep=2.75 MeV to 9 MeV, close to the upper end of the respective Gamow window of the γ process.

Cited by 32 publications

References 43 publications

Activation cross sections of proton induced nuclear reactions on palladium up to 80 MeV

Activation cross sections of proton induced nuclear reactions on palladium up to 80 MeV

Investigation of the reaction74Ge(p,γ)75
Sauerwein
¹
,
Endres
²
,
Netterdon
³

et al. 2012
Phys. Rev. C
Self Cite
36
4
40
0
View full text Add to dashboard Cite

Total and partial cross sections of theSn112(α,γ)Te116
Netterdon
¹
,
Mayer
²
,
Scholz
³

et al. 2015
Phys. Rev. C
30
0
31
0
View full text Add to dashboard Cite

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Cross sections for proton-induced reactions on Pd isotopes at energies relevant for theγprocess

Abstract: Proton-activation reactions on natural and enriched palladium samples were investigated via the activation technique in the energy range of Ep=2.75 MeV to 9 MeV, close to the upper end of the respective Gamow window of the γ process.

Cited by 32 publications

References 43 publications

Activation cross sections of proton induced nuclear reactions on palladium up to 80 MeV

Activation cross sections of proton induced nuclear reactions on palladium up to 80 MeV

Investigation of the reaction74Ge(p,γ)75Sauerwein1, Endres2, Netterdon3 et al. 2012Phys. Rev. CSelf Cite364400View full textAdd to dashboardCite

Total and partial cross sections of theSn112(α,γ)Te116Netterdon1, Mayer2, Scholz3 et al. 2015Phys. Rev. C300310View full textAdd to dashboardCite

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Investigation of the reaction74Ge(p,γ)75
Sauerwein
¹
,
Endres
²
,
Netterdon
³

et al. 2012
Phys. Rev. C
Self Cite
36
4
40
0
View full text Add to dashboard Cite

Total and partial cross sections of theSn112(α,γ)Te116
Netterdon
¹
,
Mayer
²
,
Scholz
³

et al. 2015
Phys. Rev. C
30
0
31
0
View full text Add to dashboard Cite