Shell effects in the evolution of the mass asymmetry in heavy-ion collisions leading to composite systems withZ=108

Gippner, P.; Schilling, K. D.; Seidel, W.; Stary, F.; Will, E.; Sodan, H.; Lukyanov, S. M.; Salamatin, V. S.; Penionzhkevich, Yu. É.; Chubarian, G.; Schmidt, R.

doi:10.1007/bf01294618

Cited by 8 publications

(8 citation statements)

References 20 publications

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“…For intermediate TKE values the mass distributions have wide bell-shaped forms. This result is similar to those obtained by other authors for slightly higher energies of the compound system [21,22]. Besides, the results of Cuninghame and Goodall [15] show that for the same nucleus 24~ an increase of excitation energy and angular momentum leads to an increase in TKE for symmetric fission.…”

Section: B Fission-fragment Mass Distributionssupporting

confidence: 90%

Fission accompanied by alpha particle emission in the12C(85MeV)+232Th reaction

Augustyniak

Borcea

Lewitowicz

et al. 1989

Z. Physik A - Atomic Nuclei

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Inclusive and coincident spectra of alpha particles and fission fragments were measured for the 232Th+~2C (85 MeV) reaction to study the influence of the excitation energy and the angular momentum on the fission of the compound nucleus and to separate different alpha particle emission mechanisms. At backward angles c~ emission can be accounted for by the evaporation processes. At forward angles the most important contribution is given by the break-up fusion process. Mass distributions for compound nuclei 24'~Cm (E* = 58 MeV, ff coincidences), and 24~ (E* = 37 MeV, ffc~ coincidences) were obtained. In the case of 24~ mass distribution has a shape different from those obtained in light ion reactions at the same excitation energy, indicating the strong influence of the entrance channel. The dependence of the mass distribution shape on the e particle energy is also examined.

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Section: B Fission-fragment Mass Distributionssupporting

confidence: 90%

Fission accompanied by alpha particle emission in the12C(85MeV)+232Th reaction

Augustyniak

Borcea

Lewitowicz

et al. 1989

Z. Physik A - Atomic Nuclei

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“…A similar experimental study of binary fragments of the composite systems 264,270,271,272 Hs * exited well above the Bass barrier was performed in Ref. [16] for the reactions 22 Ne+ 249 Cf, 32 S+ 238 U, 40 Ar+ 232 Th, and 56 Fe+ 208 Pb. The reaction 34 S+ 238 U was already studied in Ref.…”

Section: Introductionmentioning

confidence: 71%

Fission and quasifission modes in heavy-ion-induced reactions leading to the formation of Hs*

et al. 2011

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Mass and energy distributions of binary reaction products obtained in the reactions 22Ne+249Cf,26Mg+248Cm, 36S+238U, and 58Fe+208Pb have been measured. All reactions lead to Hs isotopes. At energies below the Coulomb barrier the bimodal fission of Hs*, formed in the reaction 26Mg+248Cm, is observed. In the reaction 36S+238U, leading to the formation of a similar compound nucleus, the main part of the symmetric fragments arises from the quasifission process. At energies above the Coulomb barrier fusion-fission is the main process leading to the formation of symmetric fragments for both reactions with Mg and S ions. In the case of the 58Fe+208Pb reaction the quasifission process dominates at all measured energies

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“…Figure 21 shows the cross-sections, which are predicted by the DNS model for neutron-rich isotopes of Md to Hs (Z = 101 − 108) in MNT reactions of 48 Ca projectiles on 244,246,248 Cm targets [22]. Note that in these MNT reactions one can also produce new neutron-rich projectile-like fragments such as 84,86 Zn and 90,92 Ge with neutron numbers Fig. 20 The so far heaviest observed multinucleon transfer products in reactions of a 16,18 O and 22 Ne beams on 254 Es targets [235], b 16,18 O and 20,22 Ne on 248 Cm [237], c 40,44,48 Ca on 248 Cm [86,238] and d 238 U beams on 238 U and 248 Cm [234].…”

Section: New Model Predictionsmentioning

confidence: 99%

“…Experiments on DIC, many of them performed in the 1980s, indicate that shell effects play an important role during the DNS evolution [62,[86][87][88][89][90][91][92] and influence the yield distributions of deep-inelastic reaction products. For example, in the symmetric reaction system 238 U + 238 U [93] one observes an unexpectedly intense diffusion of protons compared with other symmetric systems like 208 Pb + 208 Pb [94].…”

Section: Shell Effects In Mnt Reactionsmentioning

confidence: 99%

How to extend the chart of nuclides?

et al. 2020

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In the past 85 years the number of known nuclides increased by more than a factor of ten, resulting in 4000 presently known isotopes of 118 elements. This considerable progress we owe to the discovery of new reaction types along with the development of powerful accelerators and experimental techniques for separation and identification of reaction products. Model predictions indicate that still about 4000 further nuclides are waiting for their discovery. The vastest unexplored territory is located on the neutron-rich side in the upper half of the chart of nuclides and hides the answers to some of the most fundamental questions of nuclear physics like the limits of nuclear stability, element synthesis in the universe or stellar evolution. The access to these nuclei is presently limited by available beam intensities and/or the lack of appropriate methods for their production and identification. The latter concerns particularly new neutron-rich isotopes of transuranium and superheavy elements. To extend this area, the hope is presently based on multinucleon transfer reactions and on the application of fusion reactions with radioactive ion beams. But how promising are these approaches? Based on a survey of present-day knowledge, we will treat the questions where we currently are on our journey towards new territory on the chart of nuclides, how the chances are to gain new territory in the future and which challenges we will have to face.

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Shell effects in the evolution of the mass asymmetry in heavy-ion collisions leading to composite systems withZ=108

Cited by 8 publications

References 20 publications

Fission accompanied by alpha particle emission in the12C(85MeV)+232Th reaction

Fission accompanied by alpha particle emission in the12C(85MeV)+232Th reaction

Fission and quasifission modes in heavy-ion-induced reactions leading to the formation of Hs*

How to extend the chart of nuclides?

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