Structures in high-energy fusion data

Esbensen, H.

doi:10.1103/physrevc.85.064611

Cited by 46 publications

(64 citation statements)

References 22 publications

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“…The calculations that include absorption do exhibit some structures at high energies. These structures can be associated with the individual centrifugal barriers that we discussed in previous works [12,14].…”

Section: Results Of Coupled-channels Calculationsmentioning

confidence: 71%

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Isotopic effects in sub-barrier fusion of Si + Si systems

et al. 2018

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Background: Recent measurements of fusion cross sections for the 28 Si + 28 Si system revealed a rather unsystematic behavior; i.e., they drop faster near the barrier than at lower energies. This was tentatively attributed to the large oblate deformation of 28 Si because coupled-channels (CC) calculations largely underestimate the 28 Si + 28 Si cross sections at low energies, unless a weak imaginary potential is applied, probably simulating the deformation. 30 Si has no permanent deformation and its low-energy excitations are of a vibrational nature. Previous measurements of this system reached only 4 mb, which is not sufficient to obtain information on effects that should show up at lower energies. Purpose: The aim of the present experiment was twofold: (i) to clarify the underlying fusion dynamics by measuring the symmetric case 30 Si + 30 Si in an energy range from around the Coulomb barrier to deep sub-barrier energies, and (ii) to compare the results with the behavior of 28 Si + 28 Si involving two deformed nuclei. Methods:30 Si beams from the XTU tandem accelerator of the Laboratori Nazionali di Legnaro of the Istituto Nazionale di Fisica Nucleare were used, bombarding thin metallic 30 Si targets (50 μg/cm 2 ) enriched to 99.64% in mass 30. An electrostatic beam deflector allowed the detection of fusion evaporation residues (ERs) at very forward angles, and angular distributions of ERs were measured. Results: The excitation function of 30 Si + 30 Si was measured down to the level of a few microbarns. It has a regular shape, at variance with the unusual trend of 28 Si + 28 Si. The extracted logarithmic derivative does not reach the L CS limit at low energies, so that no maximum of the S factor shows up. CC calculations were performed including the low-lying 2 + and 3 − excitations. Conclusions: Using a Woods-Saxon potential the experimental cross sections at low energies are overpredicted, and this is a clear sign of hindrance, while the calculations performed with a M3Y + repulsion potential nicely fit the data at low energies, without the need of an imaginary potential. The comparison with the results for 28 Si + 28 Si strengthens the explanation of the oblate shape of 28 Si being the reason for the irregular behavior of that system.

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Section: Results Of Coupled-channels Calculationsmentioning

confidence: 71%

“…11 of Ref. [14]) that we need a short-ranged imaginary potential to explain the data at high energies. The Ch-10w5 and Ch-15w5 calculations include such a weak imaginary potential, parametrized as a simple Woods-Saxon well with depth w 0 = −5 MeV, radius R w = 6.63 fm, and diffuseness a w = 0.2 fm.…”

Section: Results Of Coupled-channels Calculationsmentioning

confidence: 98%

Isotopic effects in sub-barrier fusion of Si + Si systems

et al. 2018

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“…The clear-cut difference between the sub-barrier behavior of the two systems can be seen in Fig. 4 [25,26] have been dedicated to this subject suggesting that they may be due to the penetration of successive centrifugal barriers. In Ref.…”

Section: Specific Influence Of Nuclear Structurementioning

confidence: 95%

From fusion hindrance to oscillations

Montagnoli

2015

EPJ Web of Conferences

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Abstract. This paper is devoted mainly to the fusion hindrance phenomenon, in its various aspects. Recent experimental results on medium-light systems where the fusion Q-value is positive are discussed. The application of the coupled-channels model using a shallow ion-ion potential is illustrated for 32,36 S + 48 Ca. The detailed influence of nuclear structure on the low-energy fusion cross sections is shown for the pair of systems 48

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“…Dalam makalah ini simulasi numerik untuk melakukan proses perhitungan tampang lintang reaksi fusi dilakukan dengan menggguakan formula Wong yang diturunkan secara analitik dengan menggunakan asumsi model serapan kuat gelombang berjalan (ingoing-wave strong-absorption) [3] . Beberapa studi telah dilakukan untuk menjelaskan data eksperimen tersebut [4][5][6][7][8][9] . Reaksi-reaksi fusi yang ditinjau adalah reaksi fusi yang melibatkan inti-inti ringan yaitu 12 C+ 12 C, 16 O+ 12 C dan 16 O + 16 O dimana data eksperimen tampang lintangnya telah diperoleh [10,11,12,13,14].…”

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Simulasi Numerik Reaksi Fusi Nuklir dengan menggunakan Metode Wong

Firihu¹,

Variani²,

Justina³

2016

Indonesian J Appl Phys

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ABSTRAKSimulasi numerik untuk menghitung tampang lintang reaksi fusi nuklir yang melibatkan intiinti ringan telah dilakukan dengan menggunakan formula Wong. Reaksi-reaksi ABSTRACTThe numerical simulation for calculating the cross section of fusion reaction is done by using Wong formula. We especially calculated the cross section for the fusion reaction of light systems, i.e.12 C+ 12 C, 16 O+ 12 C and 16 O+ 16 O reactions. We compared the obtained cross section with experimental data. In order to check the accuracy of the calculations, the chi-square analisys is then permormed. We found that the simulation results of the fusion cross section obtained using Wong Formula well explain the experimetal data of the fusion cross section for the 12 PENDAHULUANReaksi inti adalah proses perubahan yang terjadi dalam inti atom. Reaksi inti atau biasa disebut dengan reaksi nuklir merupakan interaksi antara dua buah inti atom atau partikel inti atom yang saling bertumbukan sehingga menghasilkan inti atom baru disertai pelepasan energi. Prosesnya terjadinya reaksi nuklir antara sebuah inti proyektil a dan inti target X dan menghasilkan sebuah inti Y dan sebuah partikel b dapat dijabarkan sebagai berikuta = inti atom proyektil, b = partikel hasil, X = inti atom target, Y = inti hasil reaksi . Jika proses reaksi inti menghasilkan inti hasil reaksi memiliki nomor massa dan jumlah proton yang lebih besar maka reaksinya lebih dikenal sebagai reaksi fusi nuklir. Inti-inti berat yang terbentuk dapat stabil karena pengaruh gaya ikat nuklir atau yang dikenal sebagai gaya inti agar supaya memberikan gaya ikat nuklir lebih kuat dari gaya tolak menolak Coulomb [1] . Contoh reaksi fusi nuklir adalah:

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Structures in high-energy fusion data

Cited by 46 publications

References 22 publications

Isotopic effects in sub-barrier fusion of Si + Si systems

Isotopic effects in sub-barrier fusion of Si + Si systems

From fusion hindrance to oscillations

Simulasi Numerik Reaksi Fusi Nuklir dengan menggunakan Metode Wong

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