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20 Haziran 2024

Analysis of astrophysical 26Mg(n,γ)27Mg reaction via the asymptotic normalization coefficient method

The 26Mg(n,γ)27Mg reaction plays a crucial role in the process of nucleosynthesis in stars. It occurs primarily in massive stars during their late evolutionary stages or during explosive events like supernovae. This paper focuses on investigating discrepancies in the ANC values of the 26Mg(n,γ)27Mg reaction by analyzing experimental angular distributions of 26Mg(d,p)27Mg using the DWBA, ADWA and CDCC methods for both ground and first excited states. We then use a mirror nucleus procedure to extract information on the ANCs of the ground state 26Si(p,γ)27P reaction. The Hauser–Feshbach formalism of the statistical Compound Nucleus (CN) model was applied in this study to perform a compound-nucleus analysis of the 26Mg(d,p)27Mg reaction. The 26Mg(d,p)27Mg reaction has almost fulfilled the condition of peripherality, which is necessary for understanding the magnitude of the direct reaction contribution. ANCs for the 27Mg→26Mg+n virtual decay system were obtained. Moreover, according to charge symmetry of mirror nuclei, the square of proton ANC for a 27P→26Si+p is determined and comparison between the values of the presented ANCs.

https://doi.org/10.1142/s0217732323501882

A. i. Kiliç

4 Aralık 2023

The Investigation of the 8Li(α, n)11B Cross Section at Low Energy by a Distorted Wave Born Approximation Model

The investigation of the cross section of the 8Li(α, n)11B reaction has vital importance for both primordial nucleosynthesis in inhomogeneous models and constraining the physical conditions characterizing the r-process. In order to understand the reaction mechanism at low energies, we have applied the Distorted Wave Born Approximation (DWBA) theory below 2 MeV to determine direct reaction contribution. The total cross section has been calculated for the transitions of excited states to 8Li(α, n)11B. Spectroscopic factor strengths for 8Li(α, n)11B have been calculated within the framework of the shell model. Furthermore, the existing experimental measurements concerning the reaction in question at Big Bang zone and r-process region were analyzed using Wentzel, Kramers and Brilloin method (WKB) and distorted wave born approximation methods respectively. However, both resonance-like structures of 12B at low energies and unclear nuclear structure of 8 Li strongly influence total cross section in the Big Bang and r-process zones. It is apparent that reaction mechanism of 8 Li(α, n)11B is out of the scope DWBA and WKB. Furthermore, in order to understand reaction mechanisms at low energies, a new experimental setup is proposed for measuring the angular distributions and total cross-section for 8 Li(α, n)11B.

https://doi.org/10.1134/S1547477123060183

K. Czerski, D. Weissbach, A. i. Kiliç, G. Ruprecht, M. Kaczmarski, N. Targosz-Ślȩczka, K. Maass

28 Ağustos 2023

NUCLEAR ASYMPTOTIC NORMALIZATION COEFFICIENT FOR 27Al → 26Mg+p REACTION

The 26Mg(p,ɣ)27Al reaction is important in nuclear astrophysics as it play a crucial role in understanding the nucleosynthesis processes in red giants and Wolf-Rayet stars. The 26Mg(p,ɣ)27Al reaction is responsible for the production of 27Al in these stars, while the 26Mg(3He,d)27Al reaction provides information on the asymptotic normalization coefficient for the ground state of 27Al.The asymptotic normalization coefficient (ANC) method is an indirect method that provides information on the normalization of the overlap functions for a given reaction. This information is crucial for nuclear astrophysics as it allows for the calculation of the direct component of the reaction rate at astrophysical relevant energies.In this work, the angular distribution of the 26Mg(3He,d)27Al reaction have been analyzed using separate sets of optical potentials via the Distorted Wave Born Approximation which allows for a better understanding of the reaction mechanism and the determination of the ANC. Consequently,thecross section and Astrophysical S factor for 27Al→26Mg + p have been calculated for the direct capture.

https://doi.org/10.20290/estubtdb.1269417

A. i. Kiliç

22 Mart 2023

Study of the 12C + 16O fusion reaction in carbon burning via the Trojan Horse Method

12C +12 C is the main reaction during core and shell carbon burning in massive stars, however, at temperatures higher than 109K when most of the carbon is depleted and its abundance is lower than 16O, the 12C +16 O fusion can also become relevant. Moreover, 12C +16 O reaction can ignite also in the scenario of explosive carbon burning. The astrophysical energy region of interest thus ranges from 3 to 7.2 MeV in the center-of-mass frame. There are various measurements of the cross-section available in the literature, however, they all stop around 4 MeV, making extrapolation necessary at lower energies. To try to solve this uncertainty and corroborate direct measurement the Trojan Horse Method was applied to three-body processes 16O(14N, α24Mg)2H and 16O(14N, p27Al)2H to study the 16O(12C, α)24Mg and 16O(12C, p)27Al reactions.

https://doi.org/10.1051/epjconf%2F202327911015

A. i. Kiliç, A. Oliva, A. Tumino, N. Soiċ, P. Prajapati, L. Acosta, R. Alba, F. Barba, S. Cherubini, G. D'Agata, D. Dell'Aquila, A. Di Pietro, J. Fernández, P. Figuera, D. Galaviz Redondo, L. Guardo, M. Gulino, F. Hammache, D. Jelavić-Malenica, M. La Cognata, M. La Commara, L. Lamia, D. Lattuada, C. Maiolino, G. Manicò, M. Mazzocco, M. Milin, Ma Nanru, A. Nurmukhanbetova, D. Nurkić, S. Palmerini, T. Parascandolo, D. Pierroutsakou, R. Pizzone, R. Popočovski, G. Rapisarda, S. Romano, D. Santonocito, M. Sergi, A. Shotter, R. Spartá, A. Spiridon, L. Trache, N. Vukman, H. Yamaguchi

3 Şubat 2023

The 12C+16O reaction in carbon burning: Study at energies of astrophysical interest using the Trojan Horse Method

The carbon-burning process in massive stars mainly occurs via the 12C +12 C. However, at temperatures higher than 109K and considering the increased abundance of 16O produced during the later stages of the heliumburning,the 12C+16O fusion can also become relevant. Moreover, 12C+16O also plays a role in the scenario of explosive carbon burning. Thus, the astrophysical energy region of interest ranges from 3 to 7.2 MeV in the center-of-mass frame. However, the various measurements of the cross-section available in the literature stop around 4 MeV, making extrapolation necessary. To solve this uncertainty and corroborate direct measurement we applied the Trojan Horse Method to three-body processes 16O(14N, α24Mg)2H and 16O(14N, p27Al)2H to study the 12C(16O, α)24Mg and 12C(16O, p)27Al reactions in their entire energy region of astrophysical interest. In this contribution, after briefly describing the method used, the experiment and the preliminary phases of the data analysis will be presented and discussed.

https://doi.org/10.1051/epjconf%2F202327502010

A. Oliva, A. Tumino, N. Soiċ, M. P. Prajapati, L. Acosta, R. Alba, F. Barba, S. Cherubini, G. D'Agata, D. Dell'Aquila, A. Di Pietro, P.J. Fernandez, P. Figuera, D. Galaviz Redondo, L. Guardo, M. Gulino, F. Hammache, D. Jelavić-Malenica, A. i. Kiliç, M. La Cognata, M. La Commara, L. Lamia, D. Lattuada, C. Maiolino, S. Palmerini, T. Parascandolo, D. Pierroutsakou, R. Pizzone, R. Popočovski, G. Rapisarda, S. Romano, D. Santonocito, M. Sergi, A. Shotter, R. Spartá, A. Spiridon, L. Trache, N. Vukman, H. Yamaguchi, G. Manicò, M. Mazzocco, M. Milin, Ma Nanru, A. Nurmukhanbetova, D. Nurkić

3 Ocak 2023

ANC method: Experimental approach and recent results

The Asymptotic Normalization Coefficient (ANC) method, has proven to be useful in retrieving the direct part of the radiative capture cross section for a number of reactions of astrophysical interest. In this work, some of the latest results obtained by the AsFin2 group of the LSN-INFN (Catania) and the OJR of the NPI (Řež) will be briefly discussed.

https://doi.org/10.1051/epjconf%2F202327501008

A. i. Kiliç, g.D'Agata, V. Burjan, A. Cassica, J. Mrázek, V. Glagolev

1 Ocak 2023

ANC experiments for nuclear astrophysics: The 26Si(p, γ)27P case

The Asymptotic Normalization Coefficient (ANC) method has proven to be useful in retrieving the direct part of the radiative capture cross section for a number of reactions of astrophysical interest. In this work, the study of the 26Si(p, γ)27P reaction, studied via the ANC in its extension for mirror nuclei will be discussed.

https://doi.org/10.1051/epjconf%2F202327902002

A. i. Kiliç, G. D'Agata, V. Burjan, J. Mrázek, V. Glagolev, V. Kroha, A. Cassica, G. Guardo, M. La Cognata, L. Lamia, S. Palmerini, R. Pizzone, G. Rapisarda, S. Romano, M. Sergi, R. Spartá, C. Spitaleri, A. Tumino

12 Mayıs 2022

Population of Excited States in 45Ti Nuclei in Charge Exchange Reactions in a 29-MeV 3He Beam

The charge exchange reaction (3He, t) is studied using target odd nuclei of 45Sc and 197Au at 29‑MeV 3He beam energy. The angular distributions of the emission of deuterons and tritium in the 45Sc(3He, t)45Ti and 197Au(3He, t)197Hg reactions are studied. Experiments have shown that the maximum values of the cross sections for tritium emission reactions are achieved at angles close to the grazing angle. This indicates that the charge exchange reactions are of peripheral nature. The angular differential cross sections for the triton emission upon the population of the ground and excited states in 45Ti nuclei are accurately measured for the 45Sc(3He, t) 45Ti reaction.

https://doi.org/10.1134/S1063779622020770

A. i. Kiliç, N. Skobelev, Y. Penionzhkevich, I.-Siváček, T. Issatayev, g.D'Agata, V. Burjan, J. Mrázek, V. Glagolev

12 Mayıs 2022

Population of Excited States in 45Ti Nuclei in Charge Exchange Reactions in a 29-MeV 3He Beam

The charge exchange reaction (3He, t) is studied using target odd nuclei of 45Sc and 197Au at 29‑MeV 3He beam energy. The angular distributions of the emission of deuterons and tritium in the 45Sc(3He, t)45Ti and 197Au(3He, t)197Hg reactions are studied. Experiments have shown that the maximum values of the cross sections for tritium emission reactions are achieved at angles close to the grazing angle. This indicates that the charge exchange reactions are of peripheral nature. The angular differential cross sections for the triton emission upon the population of the ground and excited states in 45Ti nuclei are accurately measured for the 45Sc(3He, t) 45Ti reaction.

https://doi.org/10.1134/S1063779622020770

N. Skobelev, Y. Penionzhkevich, I. Siváček, T. Issatayev, G. D'Agata, V. Burjan, A. i. Kiliç, J. Mrázek, V. Glagolev

4 Kasım 2021

Proton inelastic scattering reveals deformation in 8He

A measurement of proton inelastic scattering of 8He at 8.25A MeV at TRIUMF shows a resonance at 3.54(6) MeV with a width of 0.89(11) MeV. The energy of the state is in good agreement with coupled cluster and no-core shell model with continuum calculations, with the latter successfully describing the measured resonance width as well. Its differential cross section analyzed with phenomenological collective excitation form factor and microscopic coupled reaction channels framework consistently reveals a large deformation parameter β2 = 0.40(3), consistent with no-core shell model predictions of a large neutron deformation. This deformed double-closed shell at the neutron drip-line opens a new paradigm.

https://doi.org/10.1016/j.physletb.2021.136710

A. i. Kiliç, M. Holl, R. Kanungo, Z.H. Sun, G. Hagen, J. Lay, A. Moro, P. Navr'atil, Thomas Papenbrock, M. Alcorta, D. Connolly, B. Davids, A. Diaz Varela, M. Gennari, G. Hackman, J. Henderson, S. Ishimoto, R. Krücken, A. Lennarz, J. Liang, J. Measures, W. Mittig, O Paetkau, A. Psaltis, S. Quaglioni, J. Randhawa, J. Smallcombe, I. Thompson, M. Vorabbi, M. Williams

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