Electromagnetic fission of238U at 600 and 1000 MeV per nucleon

Rubehn, Th.; Müller, W. F. J.; Bassini, R.; Begemann-Blaich, M.; Blaich, Th.; Ferrero, A.; Gross, C. J.; Immé, G.; Iori, I.; Kunde, G. J.; Kunze, Wolfgang; Lindenstruth, V.; Lynen, U.; Möhlenkamp, T.; Moretto, L. G.; Ocker, B.; Pochodzalla, J.; Raciti, G.; Reito, S.; Sann, H.; Schüttauf, A.; Seidel, W.; Serfling, V.; Trautmann, W.; Trzciński, A.; Verde, G.; Wörner, Antje; Zude, E.; Zwiȩgliński, B.

doi:10.1007/bf01295898

Cited by 31 publications

(8 citation statements)

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“…Since ∼1995, βDF studies by the Berkeley group with stable beams in direct kinematics allowed to perform investigations of the neutron-deficient isotopes 242,244,246,248 Es [230,107,231]. In particular, the FFMD measurements for the neutron-deficient nuclides 242,244 Es could be achieved, confirming their asymmetric mass split, as for most of the nuclei in this region. The discovery of βDF of 186,188 Bi [232] and 192,194 At [233] was reported in experiments at the velocity filter SHIP (GSI).…”

Section: Accepted Manuscriptmentioning

confidence: 91%

“…At the Lujan Center, moderated spallation is used to generate neutrons from subthermal energies up to a few hundreds of keV [195]. Several fission experiments have been performed at LANSCE, including for example fission-cross-section measurements for the reactions n+ 240,242 Pu [195], using parallel-plate ionization chambers. An another example of fission measurements is an ongoing study of total kinetic energy (TKE) in the fission of actinides and its dependence on incident-neutron energy.…”

Section: Lansce At Lanl(los Alamos) the Los Alamosmentioning

confidence: 99%

“…The figure is taken from [395]. Figure 66 shows a recent example of promptneutron-multiplicity measurements in the reaction p+ 242 Pu → 243 Am * at three beam energies, leading to appreciably higher excitation energies.…”

Section: 52mentioning

confidence: 99%

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Nuclear fission: a review of experimental advances and phenomenology

2017

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In the last two decades, through technological, experimental and theoretical advances, the situation in experimental fission studies has changed dramatically. With the use of advanced production and detection techniques both much more detailed and precise information can now be obtained for the traditional regions of fission research and, crucially, new regions of nuclei have become routinely accessible for fission studies. This work first of all reviews the recent developments in experimental fission techniques, in particular the resurgence of transfer-induced fission reactions with light and heavy ions, the emerging use of inverse-kinematic approaches, both at Coulomb and relativistic energies, and of fission studies with radioactive beams. The emphasis on the fission-fragment mass and charge distributions will be made in this work, though some of the other fission observables, such as prompt neutron and γ-ray emission will also be reviewed. A particular attention will be given to the low-energy fission in the so far scarcely explored nuclei in the very neutron-deficient lead region. They recently became the focus for several complementary experimental studies, such as β-delayed fission with radioactive beams at ISOLDE(CERN), Coulex-induced fission of relativistic secondary beams at FRS(GSI), and several prompt fusion-fission studies. The synergy of these approaches allows a unique insight in the new region of asymmetric fission around [Formula: see text]Hg, recently discovered at ISOLDE. Recent extensive theoretical efforts in this region will also be outlined. The unprecedented high-quality data for fission fragments, completely identified in Z and A, by means of reactions in inverse kinematics at FRS(GSI) and VAMOS(GANIL) will be also reviewed. These experiments explored an extended range of mercury-to-californium elements, spanning from the neutron-deficient to neutron-rich nuclides, and covering both asymmetric, symmetric and transitional fission regions. Some aspects of heavy-ion induced fusion-fission and quasifission reactions will be also discussed, which reveal their dynamical features, such as the fission time scale. The crucial role of the multi-chance fission, probed by means of multinucleon-transfer induced fission reactions, will be highlighted. The review will conclude with the discussion of the new experimental fission facilities which are presently being brought into operation, along with promising 'next-generation' fission approaches, which might become available within the next decade.

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Section: Accepted Manuscriptmentioning

confidence: 91%

Section: Lansce At Lanl(los Alamos) the Los Alamosmentioning

confidence: 99%

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Nuclear fission: a review of experimental advances and phenomenology

2017

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“…The data obtained in Ref. [272] with Au-targets were scaled to the data obtained with Pb targets. The curves show theoretical calculations using two sets of experimental GDR parameters as an input.…”

Section: Coulomb Excitationmentioning

confidence: 99%

“…whereas the fission cross sections, as well as the xn cross sections are obtained in inverse kinematics with238 U beams[271]. The data obtained in Ref [272]. with Au-targets were scaled to the data obtained with Pb targets.…”

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confidence: 99%

Indirect methods in nuclear astrophysics with relativistic radioactive beams

Aumann,

Bertulani

2019

Preprint

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Reactions with radioactive nuclear beams at relativistic energies have opened new doors to clarify the mechanisms of stellar evolution and cataclysmic events involving stars and during the big bang epoch. Numerous nuclear reactions of astrophysical interest cannot be assessed directly in laboratory experiments. Ironically, some of the information needed to describe such reactions, at extremely low energies (e.g., keVs), can only be studied on Earth by using relativistic collisions between heavy ions at GeV energies. In this contribution, we make a short review of experiments with relativistic radioactive beams and of the theoretical methods needed to understand the physics of stars, adding to the knowledge inferred from astronomical observations. We continue by introducing a more detailed description of how the use of relativistic radioactive beams can help to solve astrophysical puzzles and several successful experimental methods. State-of-the-art theories are discussed at some length with the purpose of helping us understand the experimental results reported. The review is not complete and we have focused most of it to traditional methods aiming at the determination of the equation of state of symmetric and asymmetric nuclear matter and the role of the symmetry energy. Whenever possible, under the limitations of our present understanding of experimental data and theory, we try to pinpoint the information still missing to further understand how stars evolve, explode, and how their internal structure might be. We try to convey the idea that in order to improve microscopic theories for many-body calculations, nuclear structure, nuclear reactions, and astrophysics, and in order to constrain and allow for convergence of our understanding of stars, we still need considerable improvements in terms of accuracy of experiments and the development of new and dedicated nuclear facilities to study relativistic reactions with radioactive beams.

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Systematic experimental survey on projectile fragmentation and fission induced in collisions of238U at 1A GeV with lead

et al. 1998

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Projectile fragmentation and fission, induced in collisions of 238 U at 1 AGeV with lead, have systematically been studied. A complete survey on the isotopic production cross-sections of all elements between vanadium (Z = 23) and rhenium (Z = 75) is given. About 900 reaction products were identified in the GSI fragment separator FRS from magnetic rigidities, time-of-flight values, and the energy loss in a ionisation chamber. In addition, the momentum distributions of all these reaction products have been mapped, and the products are unambiguously attributed to the different reaction mechanisms due to their kinematical properties. The results are compared with empirical systematics and previous data. PACS 24.30.Cz -Giant resonances. PACS 24.75 -General properties of fission. PACS 25.70.Mn -Projectile and target fragmentation. PACS 01.30.Cc -Conference proceedings.

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Electromagnetic fission of238U at 600 and 1000 MeV per nucleon

Cited by 31 publications

References 50 publications

Nuclear fission: a review of experimental advances and phenomenology

Nuclear fission: a review of experimental advances and phenomenology

Indirect methods in nuclear astrophysics with relativistic radioactive beams

Systematic experimental survey on projectile fragmentation and fission induced in collisions of238U at 1A GeV with lead

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