High-energy gamma-rays accompanying the spontaneous fission of 252Cf

Hotzel, A.; Thirolf, P. G.; Ender, C.; Schwalm, D.; Mutterer, M.; Singer, Péter; Klemens, M.; Theobald, J.P.; Hesse, Manfred; Gönnenwein, F.; Ploeg, H. van der

doi:10.1007/s002180050183

Cited by 13 publications

(21 citation statements)

References 11 publications

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“…1 from this work and from Ref. [18] for the region E γ = 0.1 -1.5 MeV exhibits some difference, since we obtain {A 2 /A 0 } = 0.134 and {A 4 /A 0 } = 0.002, while corresponding values of 0.0683(1) and -0.0308 (2), respectively, are reported in Ref. [18].…”

Section: Discussion and Outlookcontrasting

confidence: 65%

“…These γ rays may be divided into two categories, commonly called statistical and discrete γ rays, respectively. The first ones originate mainly from electric dipole transitions and carry away most of the remaining excitation energy of the fragments, while the latter stem mainly from electric quadrupole transitions along the Yrast line and carry away most of the angular momentum of the fragments [2]. This so-called prompt γ-ray emission is a fast process, which basically takes place within the first few nanoseconds after scission [3] and is followed by β decay(s) and thereafter by delayed emission of neutrons and γ rays towards the valley of β stability.…”

Section: Introductionmentioning

confidence: 99%

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Systematic measurements of prompt fission γ rays – and what they tell us about fission fragment de-excitation

2019

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In a recent measurement of prompt γ rays from the spontaneous fission of 252Cf an experimental setup was chosen that allowed the study of angular correlations between γ rays and the nuclei from which they were emitted. The observed angular distribution of prompt fission γ rays was then analyzed to estimate the relative contributions from radiation of different multipolarity. Preliminary results are presented and compared to previous angular correlationmeasurements from different fission processes and recent results from calculations with the Monte Carlo Hauser-Feshbach code FIFRELIN.

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Section: Discussion and Outlookcontrasting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Systematic measurements of prompt fission γ rays – and what they tell us about fission fragment de-excitation

2019

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“…Therefore, an important conclusion on the survival of the mass asymmetry in 180,182,190 Hg * even up to E * ∼66-70 MeV (E * Eff,B f (l) ∼40 MeV) can be drawn, which also proves the survival of the underlying microscopic effects even at such high excitation energies. This inference is quite different from what is known in the fission in the transuranium region, where the shell effects are quickly washed out as a function of the excitation energy.…”

Section: 12mentioning

confidence: 79%

“…Prompt fission γ-rays and neutrons can be distinguished via the time-of-flight measurements with a start signal from the fission detectors. For the latter, Frisch-gridded 4π twin ionization chambers were used [181,182] for correlation measurement between fission fragments and γ-rays.…”

Section: 12mentioning

confidence: 99%

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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“…Prompt fission γ rays may be divided into statistical and discrete γ rays, with a typical dipole and quadrupole character, respectively. dipole transitions and carry away most of the remaining excitation energy of the fragments, while the latter stem mainly from electric quadrupole transitions along the Yrast line and carry away most of the angular momentum of the fragments [11]. This so-called prompt γ-ray emission is a fast process, which basically takes place within the first few nanoseconds after scission [12] and is followed by β decay(s) and thereafter by delayed emission of neutrons and γ rays towards the valley of β stability.…”

Section: Introductionmentioning

confidence: 99%

Prompt fission gamma rays and their angular distributions

et al. 2018

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In a recent measurement of prompt γ rays from the spontaneous fission of 252Cf an experimental setup was chosen that allowed the study of angular correlations between γ rays and the nuclei from which they were emitted. The observed angular distribution of the prompt fission γ rays was then analyzed to estimate the relative contributions from radiation of different multipolarity. From that we hope to obtain more detailed information about the early stage of the de-excitation process of fission fragments, right after prompt neutron emission. First preliminary results are presented below.

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High-energy gamma-rays accompanying the spontaneous fission of 252Cf

Cited by 13 publications

References 11 publications

Systematic measurements of prompt fission γ rays – and what they tell us about fission fragment de-excitation

Systematic measurements of prompt fission γ rays – and what they tell us about fission fragment de-excitation

Nuclear fission: a review of experimental advances and phenomenology

Prompt fission gamma rays and their angular distributions

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