High multiplicity α-particle breakup measurements to study α-condensate states

11th International Conference on Clustering Aspects of Nuclear Structure and Dynamics

Bishop, J.^1 ; Kokalova, Tz^1 ; Freer, M.^1 ; Assie, M.^3 ; Acosta, L.^2,4 ; Bailey, S.^1 ; Cardella, G.^2 ; Curtis, N.^1 ; De Filippo, E.^2 ; Dell'Aquila, D.^6 ; De Luca, S.^5 ; Francalanza, L.^6 ; Gnoffo, B.^2 ; Lanzalone, G.^7,8 ; Lombardo, I.^6 ; Martorana, N.^7 ; Norella, S.^5 ; Pagano, A.^2 ; Pagano, E.V.^7,9 ; Papa, M.^2 ; Pirrone, S.^2 ; Politi, G.^2,9 ; Rizzo, F.^7,9 ; Russotto, P.^2 ; Quattrocchi, L.^5 ; Smith, R.^1 ; Stefan, I.^3 ; Trifirò, A.^5 ; Trimarchì, M.^5 ; Verde, G.^2,3 ; Vigilante, M.^6 ; Wheldon, C.^1

School of Physics and Astronomy, University of Birmingham, United Kingdom^1

INFN, Sezione di Catania, Italy^2

Institut de Physique Nuclaire, CNRS/IN2P3, Université Paris-Sud 11, France^3

Universidad Nacional Autónoma de México, Mexico City, Mexico^4

INFN - Gr. Coll/ Messina, Dipartimento di Fisica, Universitá Messina, Italy^5

INFN Sezione di Napoli, Dipartimento di Fisica, Universitá Federico II, Napoli, Italy^6

INFN LNS, Catania, Italy^7

Universitá Kore, Enna, Italy^8

Dipartimento di Fisica e Astronomia, Universitá di Catania, Italy^9

关键词: Beam energies;    Condensed state;    Excitation regime;    High multiplicity;    High-solids;    Particle breakup;    Particle identifications;    Particle multiplicity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/863/1/012070/pdf
DOI  :  10.1088/1742-6596/863/1/012070

来源: IOP

【 摘 要 】

An experiment was performed to investigate α-condensate states via high α-particle multiplicity breakup. The nucleus of interest was28Si therefore to measure multiplicity 7 particle breakup events, a highly granular detector with a high solid angle coverage was required. For this purpose, the CHIMERA and FARCOS detectors at INFN LNS were employed. Particle identification was achieved through ΔE-E energy loss. The α-particle multiplicity was measured at three beam energies to investigate different excitation regimes in28Si. At a beam energy where the energy is sufficient to provide the 7 α-particles with enough energy to be identified using the ΔE-E method, multiplicity 7 events can be seen. Given these high multiplicity events, the particles can be reconstructed to investigate the breakup of α-condensate states. Analysing the decay paths of these states can elucidate whether the state of interest corresponds to a non-cluster, clustered or condensed state.