Publisher’s Note: Probing preformed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>α</mml:mi></mml:mrow></mml:math>particles in the ground state of nuclei [Phys. Rev. C<b>82</b>, 031301 (2010)]

Scarpaci, J. A.; Fallot, M.; Lacroix, Denis; Assié, M.; Lefebvre, L.; Frascaria, N.; Beaumel, D.; Bhar, C.; Blumenfeld, Y.; Chbihi, A.; Chomaz, Ph.; Désesquelles, P.; Frankland, J.D.; Idbarkach, H.; Khan, E.U.; Laville, J.L.; Plagnol, E.; Pollacco, E.; Roussel-Chomaz, P.; Roynette, J.C.; Shrivastava, A.; Zerguerras, T.

doi:10.1103/physrevc.82.039902

Cited by 6 publications

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“…The study of quantum systems composed of mixtures of bosons and fermions stimulates significant theoretical and experimental efforts in different fields of physics. For instance investigations on mixtures of bosonic and fermionic atomic quantum systems, with the outstanding example of 3 He- 4 He fluids, have led to the observation of Bose Einstein condensation (BEC) and Fermi quenching (FQ) [1,2]. Atomic nuclei are commonly described as systems of strongly interacting fermions, namely neutrons and protons.…”

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Signals of Bose Einstein condensation and Fermi quenching in the decay of hot nuclear systems

et al. 2016

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We report on first experimental observations of nuclear fermionic and bosonic components displaying different behaviours in the decay of hot Ca projectile-like sources produced in mid-peripheral collisions at sub-Fermi energies. The experimental setup, constituted by the coupling of the INDRA 4π detector array to the forward angle VAMOS magnetic spectrometer, allowed to reconstruct the mass, charge and excitation energy of the decaying hot projectile-like sources. By means of quantum-fluctuation analysis techniques, temperatures and local partial densities of bosons and fermions could be correlated to the excitation energy of the reconstructed system. The results are consistent with the production of dilute mixed systems of bosons and fermions, where bosons experience higher phase-space and energy density as compared to the surrounding fermionic gas. Our findings recall phenomena observed in the study of Bose condensates and Fermi gases in atomic traps despite the different scales

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Signals of Bose Einstein condensation and Fermi quenching in the decay of hot nuclear systems

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“…1) is difficult. However, using the previous work of the reference [12], the widths and the amplitudes of these calculations might indicate that the 6s wave function may be assigned to the 0 + ground state of the 36 Ar, 5d to the 2 + excited state and 4g to the 4 + state. However, the extraction of spectroscopic factors is very complicated due to the fact that several detectors were not functioning properly.…”

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confidence: 79%

“…This model shows that the angular and energy distributions depend on the initial quantum properties of the towed particle (angular momentum, extension of the wave function and binding energy). Thus, the Towing Mode is a powerful tool for inferring spectroscopic information of nucleons and clusters in nuclei [10,11,12]. In the TDSE model, the target and the projectile nucleus are represented by a mean-field nuclear potential part and a Coulomb repulsive part.…”

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confidence: 99%

Study of alpha clusters in 40Ca through nuclear break-up

Lefebvre¹

2013

Proceedings of 51st International Winter Meeting on Nuclear Physics — PoS(Bormio 2013)

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“…The experiment was performed at GANIL with the reaction 40 Ca+ 40 Ca at 50 MeV/A (Ref. [3]). The projectile was identified with the SPEG spectrometer and the emitted alpha with the INDRA array.…”

Section: -Probing Alpha Clusterization In Nucleimentioning

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Study of pairing and clusterisation in light nuclei through nuclear break-up

Assié

Scarpaci

Lacroix

2014

EPJ Web of Conferences

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Abstract. Nuclear break-up is a powerful tool to investigate nuclear structure as it is sensitive to the quantum properties of the emitted particles. This reaction mechanism has been used to investigate several aspects of correlations. First, the case of 11 Be was studied where the spectroscopic factors for the two configurations where extracted. Secondly, the spectroscopic factor for alpha clusterization in the ground state of 40 Ca was measured. Finally the correlation between the two neutrons in the halo of 6 He emitted through breakup reactions showed strong contribution for the di-neutron configuration. Nuclear break-upNuclear break-up occurs at few tens of MeV per nucleon. Among all other inelastic processes leading to the emission of one nucleon, the nuclear break-up, also called Towing Mode is characterized by the emission of a nucleon from the target on the same side as the projectile with an intermediate velocity and a large angle with respect to the beam axis. Knock-out reactions lead to a nucleon emitted around 90 deg. while pick-up break-up reactions lead to forward emission. The mechanism is understood the following way: when the projectile passes by the target, the nucleon inside the target feels its nuclear potential and is towed to be emitted to the continuum. This picture is confirmed by a theoretical model solving the time dependent Schrödinger equation (TDSE) for the wave function of a nucleon inside the potential of target when the projectile potential passes by.The nuclear break-up was brought out in the 40 Ar+ 58 Ni @ 44 MeV/A reaction where the neutron or proton knock-out was measured [1]. In addition to the statistical decay, a contribution was highlighted in the forward region. The angular distribution extracted for each excited state populated in the daughter nucleus showed very good agreement with the TDSE calculations (see Fig. 1). Therefore nuclear break-up is sensitive to the initial wave function (quantum numbers) of the nucleon inside the target and can be used as a tool to probe nuclear structure. Several other examples of the use of nuclear break-up will be shown below such as configuration mixing, pairing correlation and clusterization into alpha particles.

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Publisher’s Note: Probing preformedαparticles in the ground state of nuclei [Phys. Rev. C82, 031301 (2010)]

Cited by 6 publications

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Signals of Bose Einstein condensation and Fermi quenching in the decay of hot nuclear systems

Signals of Bose Einstein condensation and Fermi quenching in the decay of hot nuclear systems

Study of alpha clusters in 40Ca through nuclear break-up

Study of pairing and clusterisation in light nuclei through nuclear break-up

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