Benefits of extended capabilities of the driver accelerator for EURISOL

Schmidt, K.‐H.; Kelić, A.; Lukić, S.; Ricciardi, M. V.; Veselský, M.

doi:10.1103/physrevstab.10.014701

Cited by 7 publications

(5 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In parallel, fission offers an important mechanism to produce a variety of isotopes for medical and industrial use [6]. It is also one of the main approaches to produce exotic neutron-rich nuclei in Rare Isotope Beam (RIB) facilities [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Microscopic dynamical description of proton-induced fission with the constrained molecular dynamics model

et al. 2015

Self Cite

View full text Add to dashboard Cite

The microscopic description of nuclear fission still remains a topic of intense basic research. Understanding nuclear fission, apart from a theoretical point of view, is of practical importance for energy production and the transmutation of nuclear waste. In nuclear astrophysics, fission sets the upper limit to the nucleosynthesis of heavy elements via the r-process. In this work we initiated a systematic study of intermediate energy proton-induced fission using the Constrained Molecular Dynamics (CoMD) code. The CoMD code implements an effective interaction with a nuclear matter compressibility of K=200 (soft EOS) with several forms of the density dependence of the nucleon-nucleon symmetry potential. Moreover, a constraint is imposed in the phase-space occupation for each nucleon restoring the Pauli principle at each time step of the collision. A proper choice of the surface parameter of the effective interaction has been made to describe fission. In this work, we present results of fission calculations for proton-induced reactions on : a) 232 Th at 27 and 63 MeV, b) 235 U at 10, 30, 60 and 100 MeV, and c) 238 U at 100 and 660 MeV. The calculated observables include fission-fragment mass distributions, total fission energies, neutron multiplicities and fission times. These observables are compared to available experimental data. We show that the microscopic CoMD code is able to describe the complicated many-body dynamics of the fission process at intermediate and high energy and give a reasonable estimate of the fission time scale. Sensitivity of the results to the density dependence of the nucleon symmetry potential (and, thus, the nuclear symmetry energy) is found. Further improvements of the code are necessary to achieve a satisfactory description of low energy fission in which shell effects play a dominant role.Understanding the mechanism of nuclear fission, that is the transformation of a single heavy nucleus into two receeding fragments, has been a long journey of fruitful research and debate and, still today, is far from being complete. Upon its discovery, fission was interpreted by Meitner and Frisch [22] as the division of a charged liquid drop due to the interplay of the repulsive Coulomb force between the protons and the surface tension due to the attractive nucleon-nucleon interaction. In the seminal paper of Bohr and Wheeler [23], fission was described with a liquid-drop model and the first estimates of fission probalilities were obtained based on statistical arguments. The first detailed calculations of potential energies of deformed nuclear drops were performed by Frankel and Metropolis in 1947 [24] employing the ENIAC, one of the first digital computers. Despite the success in the interpretation of fission based on the liquid-drop model, the prevailing asymmetry in the mass distribution of the minor actinides could not be deciphered until shell corrections to the macroscopic liquid drop were taken into account (see below). A detailed statistical model that could describe asymmetric fission was...

show abstract

Section: Introductionmentioning

confidence: 99%

Microscopic dynamical description of proton-induced fission with the constrained molecular dynamics model

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…An ISOL-type radioactive ion beam facility could be the source of the exotic nuclei. ISOL-beams combine high intensity and good quality [31]. For this particular application, the charge state of the revolving ions is not important, except for the constraints concerning the difference in trajectory with charged particles in the exit channel.…”

Section: Neutron Capture Measurements In Inverse Kinematicsmentioning

confidence: 99%

Measurements of neutron-induced reactions in inverse kinematics and applications to nuclear astrophysics

Reifarth

Litvinov

Endres

et al. 2015

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. Neutron capture cross sections of unstable isotopes are important for neutron-induced nucleosynthesis as well as for technological applications. A combination of a radioactive beam facility, an ion storage ring and a high flux reactor would allow a direct measurement of neutron induced reactions over a wide energy range on isotopes with half lives down to minutes. The idea is to measure neutron-induced reactions on radioactive ions in inverse kinematics. This means, the radioactive ions will pass through a neutron target. In order to efficiently use the rare nuclides as well as to enhance the luminosity, the exotic nuclides can be stored in an ion storage ring. The neutron target can be the core of a research reactor, where one of the central fuel elements is replaced by the evacuated beam pipe of the storage ring. Using particle detectors and Schottky spectroscopy, most of the important neutron-induced reactions, such as (n,γ), (n,p), (n,α), (n,2n), or (n,f), could be investigated.

show abstract

“…The study of the nuclear landscape toward the astrophysical r-process path and the neutron drip-line is presently of special importance to the nuclear physics and astrophysics community (see, e.g., [1][2][3] and references therein). Closely related to this study is the efficient production of very neutron-rich nuclides which is a central issue in current and future rare isotope beam facilities (see, e.g., [4][5][6][7][8][9][10][11][12][13][14][15]).…”

Section: Introductionmentioning

confidence: 99%

Neutron-rich rare-isotope production from projectile fission of heavy nuclei near 20 MeV/nucleon beam energy

et al. 2016

Self Cite

View full text Add to dashboard Cite

We investigate the possibilities of producing neutron-rich nuclides in projectile fission of heavy beams in the energy range of 20 MeV/nucleon expected from low-energy facilities. We report our efforts to theoretically describe the reaction mechanism of projectile fission following a multinucleon transfer collision at this energy range. Our calculations are mainly based on a two-step approach: the dynamical stage of the collision is described with either the phenomenological Deep-Inelastic Transfer model (DIT), or with the microscopic Constrained Molecular Dynamics model (CoMD). The deexcitation/fission of the hot heavy projectile fragments is performed with the Statistical Multifragmentation Model (SMM). We compared our model calculations with our previous experimental projectile-fission data of 238 U (20 MeV/nucleon)+ 208 Pb and 197 Au (20 MeV/nucleon)+ 197 Au and found an overall reasonable agreement. Our study suggests that projectile fission following peripheral heavy-ion collisions at this energy range offers an effective route to access very neutron-rich rare isotopes toward and beyond the astrophysical r-process path.

show abstract

Benefits of extended capabilities of the driver accelerator for EURISOL

Cited by 7 publications

References 44 publications

Microscopic dynamical description of proton-induced fission with the constrained molecular dynamics model

Microscopic dynamical description of proton-induced fission with the constrained molecular dynamics model

Measurements of neutron-induced reactions in inverse kinematics and applications to nuclear astrophysics

Neutron-rich rare-isotope production from projectile fission of heavy nuclei near 20 MeV/nucleon beam energy

Contact Info

Product

Resources

About