Thermodynamical features of multifragmentation in peripheral Au + Au collisions at 35 A MeV

D’Agostino, M.; Botvina, A. S.; Bruno, M.; Bonasera, A.; Bondorf, J.P.; Bougault, R.; Désesquelles, P.; Geraci, E.; Gulminelli, F.; Iori, I.; Neindre, N. Le; Margagliotti, G. V.; Mishustin, I. N.; Moroni, A.; Pagano, A.; Vannini, G.

doi:10.1016/s0375-9474(99)00097-4

Cited by 144 publications

(148 citation statements)

References 77 publications

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“…The close similarity between statistical models [6] and data [4,5], together with the isotropy of fragment emission, already suggest that these sets of data are close to a statistical equilibrium. To progress on this point, we can also compare different data sets.…”

Section: Equilibrium Partitionsmentioning

confidence: 69%

“…In the following we present thermodynamical studies performed on quasi-projectile events from peripheral 35 A MeV Au+Au collisions [4] and central events from 25 A MeV Au + C, 25 and 35 A MeV Au + Cu and 35 A MeV Au + Au collisions [5], measured at the K1200-NSCL Cyclotron of the Michigan State University with the MULTICS-MINIBALL apparatus.…”

Section: Equilibrium Partitionsmentioning

confidence: 99%

“…Single source almost complete events have been selected with a constant value for the collected charge 1 in each energy bin [4,5]. The possible pollution from other sources has been minimized for central collisions through a shape analysis and in the case of Au quasi-projectile by substituting the backward light particle emission by the symmetric of the forward emission in the quasi-projectile reference frame.…”

Section: Equilibrium Partitionsmentioning

confidence: 99%

“…3) and a consistent set of critical exponents can also be extracted from the Au QP data samples, for which the heat capacity evaluation points to a first order phase transition [4,16], and the quality of the scaling does not depend the ansatz adopted for the T parameter. The same ansatz for the scaling function applied to central events [5] gives similar exponents and points to the same critical-like energy.…”

Section: Pseudo-critical Behaviour In Nucleimentioning

confidence: 99%

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Experimental signals of phase transition

D’Agostino¹,

Bruno²,

Gulminelli³

et al. 2004

Nuclear Physics A

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The connection between the thermodynamics of charged finite nuclear systems and the asymptotically measured partitions is presented. Some open questions, concerning in particular equilibrium partitions are discussed. We show a detailed comparison of the decay patterns in Au + C, Cu, Au central collisions and in Au quasi-projectile events. Observation of abnormally large fluctuations in carefully selected samples of data is reported as an indication of a first order phase transition (negative heat capacity) in the nuclear equation of state.

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Section: Equilibrium Partitionsmentioning

confidence: 69%

Section: Equilibrium Partitionsmentioning

confidence: 99%

Section: Equilibrium Partitionsmentioning

confidence: 99%

Section: Pseudo-critical Behaviour In Nucleimentioning

confidence: 99%

See 2 more Smart Citations

Experimental signals of phase transition

D’Agostino¹,

Bruno²,

Gulminelli³

et al. 2004

Nuclear Physics A

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“…For more detailed description of the SMM see Refs. [32][33][34][35][36].In the aftermath of the nuclear reaction, if the total mass of the final system is lower than the initial mass, the loss in mass which is called mass defect is converted into a large amount of energy given by (∆E = ∆mc 2 ). The difference of total binding energy before and after the reactions is defined as:…”

mentioning

confidence: 99%

Nuclear energy release from fragmentation

Souza

Tsang

et al. 2016

Nuclear Physics A

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Abstract. Nuclear energy released by splitting Uranium and Thorium isotopes into two, three, four, up to eight fragments with nearly equal size are studied. We found that the energy released from equally splitting the 235,238 U and 230,232 Th nuclei into to three fragments is largest. The statistical multifragmentation model is employed to calculate the probability of different breakup channels for the excited nuclei. Weighing the the probability distributions of fragments multiplicity at different excitation energies for the 238 U nucleus, we found that an excitation energy between 1.2 and 2 MeV/u is optimal for the 235 U, 238 U, 230 Th and 232 Th nuclei to release nuclear energy of about 0.7-0.75 MeV/u. ‡ Email: imqmd@qq.com § Corresponding author: fszhang@bnu.edu.cn Nuclear energy release from fragmentation 2 Nuclear energy is one of the most efficient sources of energy based on the Einstein's mass-energy equivalence formula (∆E = ∆mc 2 ). It originates in the strong force holding the protons and neutrons together. The release of nuclear energy happens when nucleons rearrange themselves to form more stable nuclei. In such nuclear reaction processes, a large amount of energy is released in the form of emitted kinetic energy of particles or fragments and electromagnetic radiation.There are three ways to release nuclear energy, known as radioactive decay [1][2][3][4], fusion [5][6][7][8][9][10] and fission [11][12][13][14][15]. The radioactive decay is the spontaneous process which occurs in radioactive materials by which the nuclei of unstable parent nuclei, gradually break up and are transformed into more stable isotopes or into nuclei of a different type. The daughter nuclei, consequently lose energy by emitting radiation in the form of particles (include α, β, photons, neutrons particle etc.) and/or electromagnetic waves. The continuous fusion reaction happens in the core of stars including our sun. However in order to harness it to produce power, the fusion process must be controlled. Nuclear energy from fusion is still far from commercially viable even though controllable fusion reaction has been studied for many years through the means of magnetic confinement [16][17][18] and inertial confinement [19][20][21][22]. The fission technology has been widely used to generate power by neutron-induced chain reactions. This fission process occurs when a heavy nucleus such as 235 U and 239 Pu absorbs a thermal neutron and the excited compound nucleus is excited to be near its fission barrier. At low excitation energy, quantum effects in the fission process are very significant to the dynamical evolution of the system. Nuclear structure effects, such as the shell corrections, directly influence the fission barrier height and the fission path. Most fission modes induced by thermal neutron are binary fissions in which one daughter nucleus has a mass of about 90 to 100 u and the remaining nucleus 130 to 140 u. Occasionally ternary fission and quaternary fission occur with relatively probability of 1/300 and 1/3000 per ...

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Phase Transitions in Finite Systems

Chomaz

Gulminelli

2002

Lecture Notes in Physics

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Thermodynamical features of multifragmentation in peripheral Au + Au collisions at 35 A MeV

Cited by 144 publications

References 77 publications

Experimental signals of phase transition

Experimental signals of phase transition

Nuclear energy release from fragmentation

Phase Transitions in Finite Systems

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