K. Sonnabend

Splitting of the Pygmy Dipole Resonance

D. Savran, J. Endres, N. Pietralla, K. Sonnabend et autres

We report on experiments using the (α, α′ γ) method to investigate the structure of the Pygmy Dipole Resonance (PDR) in the nuclei ⁹⁴Mo, ¹²⁴Sn, ¹³⁸Ba and ¹⁴⁰Ce. The experiments were performed with the Big-Bite Spectrometer (BBS) at the KVI at an …

Measurement of total and partial cross sections of the $$^{90}$$Zr(p,$$\gamma $$)$$^{91}$$Nb reaction with in-beam $$\gamma $$-ray spectroscopy

Philipp Erbacher, T. Heftrich, A.W. Endres, J. Glorius et autres

Abstract The origin of many p-nuclei remains an unsolved problem in nuclear astrophysics. While photo-dissociation reactions in the $$\gamma $$ γ -process can explain the production of many p-nuclei, some, notably $$^{92,94}$$ 92 , 94 Mo and $$^{96,98}$$ 96 , 98 Ru …

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Structure of high-lying levels populated in the 96Y →96Zr β decay

K.R. Mashtakov, V. Yu. Ponomarev, M. Scheck, S. W. Finch et autres

The nature of the high-lying final levels of the 96Ygs β decay, one of the three most important contributors to the high-energy reactor antineutrino spectrum, has been investigated in high-resolution γ-ray spectroscopy following the β decay as well as in a campaign …

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Neutron activation of Ga69 and Ga71 at kBT≈25keV

K. Göbel, Clemens Beinrucker, Benjamin Brückner, Philipp Erbacher et autres

Background: About 50% of heavy elements are produced by the slow neutron capture process ($s$ process) in stars. The element gallium is mostly produced during the weak $s$ process in massive stars.Purpose: Our activation at ${k}_{\mathrm{B}}T\phantom{\rule{4pt}{0ex}}\ensuremath{\approx}25$ keV is the first experiment in …

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Dipole response of Rb87 and its impact on the Rb86(n,γ)Rb87 cross section

Julius Wilhelmy, M. Müscher, Gencho Y. Rusev, R. Schwengner et autres

Background: Detailed information on the low-lying dipole response in atomic nuclei along isotonic or isotopic chains is well suited to systematically investigate the structure and evolution of the pygmy dipole resonance (PDR). Moreover, the dipole strength below and around the neutron separation …

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Online tools for nucleosynthesis studies

K. Göbel, J. Glorius, Alexander Koloczek, M. Pignatari et autres

The nucleosynthesis of the elements between iron and uranium involves many different astrophysical scenarios covering wide ranges of temperatures and densities. Thousands of nuclei and ten thousands of reaction rates have to be included in the corresponding simulations. We investigate the impact …

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Didaktische Rekonstruktion der Nukleosynthese schwerer Elemente

Albert Teichrew, Roger Erb, K. Sonnabend

Die Entstehung schwerer Elemente von Eisen bis Uran bleibt eine der wichtigen physikalischen Fragen des neuen Jahrhunderts. Dass der Ursprung der Materie bislang nicht im vollen Umfang im Unterricht behandelt wird, ist daher naheliegend. Es bietet sich jedoch an, das oft bestatigte …

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Proton capture reaction cross section measurements on Er162 as a probe of statistical model calculations

N. Özkan, R. T. Güray, Caner Yalçın, Wanpeng Tan et autres

It is crucial to measure reaction cross sections relevant to the astrophysical $\ensuremath{\gamma}$ process so that theoretical reaction rates can be tested and validated with experimental data. The total cross sections for the $^{162}\mathrm{Er}(p,\ensuremath{\gamma})^{163}\mathrm{Tm}$ and the $^{162}\mathrm{Er}(p,n)^{162}\mathrm{Tm}$ reactions have been measured by …

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Alpha-induced reactions on selenium between 11 and 15 MeV

Stefan Fiebiger, Z. Slavkovská, U. Giesen, K. Göbel et autres

The production of 77,79,85,85 m Kr and 77 Br via the reaction Se( ) was investigated between and 15 MeV using the activation technique. The irradiation of natural selenium targets on aluminum backings was conducted at the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, …

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Cu63(n,γ) cross section measured via 25 keV activation and time of flight

Mario Weigand, Clemens Beinrucker, Aaron Joseph Couture, Stefan Fiebiger et autres

In the nuclear mass range $A\ensuremath{\approx}60$ to 90 of the solar abundance distribution the weak $s$-process component is the dominant contributor. In this scenario, which is related to massive stars, the overall neutron exposure is not sufficient for the $s$ process to …

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Neutron capture cross sections of 69Ga and 71Ga at 25 keV and Epeak = 90 keV

K. Göbel, Clemens Beinrucker, Philipp Erbacher, Stefan Fiebiger et autres

We measured the neutron capture cross sections of 69Ga and 71Ga for a quasi-stellar spectrum at kBT = 25 keV and a spectrum with a peak energy at 90 keV by the activation technique at the Joint Research Centre (JRC) in Geel, …

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Dipole response of the odd-proton nucleus 205 Tl up to the neutron-separation energy

N. Benouaret, J. Beller, H. Pai, N. Pietralla et autres

Abstract The low-lying electromagnetic dipole strength of the odd-proton nuclide 205 Tl has been investigated up to the neutron separation energy exploiting the method of nuclear resonance fluorescence. In total, 61 levels of 205 Tl have been identified. The measured strength distribution …

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