Fusion–fission is a new reaction mechanism to produce exotic radioactive beams

Tarasov, O.; Villari, A. C. C.

doi:10.1016/j.nimb.2008.05.114

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…The beam energy at the center of the target was estimated to be 193 MeV and the effective irradiation time was 24 hours. The energy loss in the degrader foils and targets was calculated using the program LISE++ [6]. Four silicon avalanche photodiodes mounted at ± °30 and ± °45 with respect to the incident beam direction were used to monitor the beam intensity via measuring the scattered projectiles.…”

Section: Methodsmentioning

confidence: 99%

Experiment for synthesis of neutron-deficient protactinium isotopes

Yang¹,

Ma²,

Zhang³

et al. 2014

J. Phys. G: Nucl. Part. Phys.

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The complete fusion reaction 40 Ca+ 175 Lu was studied at a beam energy of 5.1 MeV u −1 . Evaporation residues recoiled from the target were separated from the primary beam by the gas-filled recoil separator SHANS and then implanted into the focal plane detection system. Based on the energy-positiontime correlation measurement, neutron-deficient nuclei − 208 213 Ac, 212 Pa and 211 Th produced in this reaction were identified. Previously reported decay properties of the ground state in 212 Pa were confirmed and improved values of − + 5.1 1.75.1 ms and 8.250(20) MeV for the half-life and α-particle energy of 212 Pa were obtained. No correlated decay chain arising from 211 Pa was observed and an upper limit for the cross section of 211 Pa was estimated.

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Section: Methodsmentioning

confidence: 99%

Experiment for synthesis of neutron-deficient protactinium isotopes

Yang¹,

Ma²,

Zhang³

et al. 2014

J. Phys. G: Nucl. Part. Phys.

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“…However, this does not represent a real limitation for clinical applications where, often, dedicated ripple filters (RiFi) are used to broaden momentum spread, and therefore the Bragg peak, in order to be able to irradiate the tumor with a uniform dose distribution and a reasonable number of energy steps [ 44 ]. Secondary beam energies were estimated with LISE++ (version 13.4.5 beta) [ 45 ], based on the measured path length in water and directly in FLUKA by matching the exact peak position. Estimated energies are reported together with the ranges, the achieved intensities and beam purity in Table 1 .…”

Section: Resultsmentioning

confidence: 99%

Depth dose measurements in water for 11C and 10C beams with therapy relevant energies

Boscolo

Kostyleva²,

Schuy³

et al. 2022

Nuclear Instruments and Methods in Physics Research Section A:

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“…High-energy fusion-fission reactions in inverse kinematics may be an interesting technique to produce exotic-ion beams, as higher energy induces larger fusion cross section, the possibility to use thicker targets, and consequently higher yields of exotic nuclei, which can compensate the larger number of evaporated neutrons. In addition, high-energy fission allows to produce nuclei in the valley region, as well as on a broader range of elements [27,28]. GANIL offers the possibility to accelerate 238 U beam up to 24 A MeV.…”

Section: Fission Experiments Using Inverse Kinematics At Higher Bombarmentioning

confidence: 99%

Isotopic fission fragment distributions as a deep probe to fusion-fission dynamics

Farget

Caamaño

Delaune

et al. 2013

J. Phys.: Conf. Ser.

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Abstract. During the fission process, the atomic nucleus deforms and elongates up to the two fragments inception and their final separation at the scission deformation. The evolution of the nucleus energy with deformation defines a potential energy landscape in the multidimensional deformation space. It is determined by the macroscopic properties of the nucleus, and is also strongly influenced by the single-particle structure of the nucleus, which modifies the macroscopic energy minima. The fission fragment distribution is a direct consequence of the deformation path the nucleus has encountered, and therefore is the most genuine experimental observation of the potential energy landscape of the deforming nucleus. Very asymmetric fusionfission reactions at energy close to the Coulomb barrier, produce well-defined conditions of the compound nucleus formation, where processes such as quasi-fission, pre-equilibrium emission and incomplete fusion are negligible. In the same time, the excitation energy is sufficient to reduce significantly structural effects, and mostly the macroscopic part of the potential is responsible for the formation of the fission fragments. We use inverse kinematics combined with a spectrometer to select and identify the fission fragments produced in 238 U+ 12 C at a bombarding energy close to and well-above the Coulomb barrier. For the first time, the isotopic yields are measured over the complete atomic-number distribution, between Z=30 and Z=63. In the experimental set-up, it is also possible to identify transfer-induced reactions, which lead to low-energy fission where the nuclear shell structure shows a strong influence on the fission-fragment distributions. The resulting set of data gives the possibility to observe the fission fragment properties over a wide range of excitation energy, and they reveal the vanishing of the shell effects in the potential energy of the fissioning nucleus, as well as the influence of fission dynamics. IntroductionFragment mass distributions produced in low excitation-energy fission of trans-uranium actinides are known for a long time to present in general a double-humped structure, the fragments being divided in two distinct groups, a heavy-fragment group and a light-fragment one [1]. With increasing mass of the fissioning nucleus, the heavy-fragment group shows a constant average mass, close to the value A=140, whereas the average mass of the light-fragment group increases. This double-humped structure has been understood as a signature for shell-structure influence in the potential energy describing the deforming nucleus from the ground state to the scission point deformation. The constant position of the heavy fragment distribution lead to the comprehension that the shell influence is in fact the single-particle structure inside the nascent fragments, and not in the fissioning nucleus. The most spread model for the description of the fission fragment distribution is based on the macro-microscopic description of the fissioning nucleus potential energy [2, 3...

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Fusion–fission is a new reaction mechanism to produce exotic radioactive beams

Cited by 10 publications

References 14 publications

Experiment for synthesis of neutron-deficient protactinium isotopes

Experiment for synthesis of neutron-deficient protactinium isotopes

Depth dose measurements in water for 11C and 10C beams with therapy relevant energies

Isotopic fission fragment distributions as a deep probe to fusion-fission dynamics

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