Mass and charge identification of fragments detected with the Chimera Silicon–CsI(Tl) telescopes

Neindre, N. Le; Alderighi, M.; Anzalone, A.; Barná, R.; Bartolucci, M.; Berceanu, I.; Borderie, B.; Bougault, R.; Bruno, M.; Cardella, G.; Cavallaro, S.; D’Agostino, M.; Dayras, R.; Filippo, E. De; Pasquale, D. De; Geraci, E.; Giustolisi, F.; Grzeszczuk, A.; Guazzoni, P.; Guinet, D.; Iacono-Manno, M.; Italiano, A.; Kowalski, S.; Lanchais, A.; Lanzanó, G.; Lanzalone, G.; Li, S; Nigro, S. Ló; Maiolino, C.; Manfredi, G.; Moisă, D.; Pagano, A.; Papa, M.; Paduszyński, T.; Petrovici, M.; Piasecki, E.; Pirrone, S.; Politi, G.; Pop, A.; Porto, F.; Rivet, M. F.; Rosato, E.; Russo, Simone; Sambataro, S.; Sechi, G.R.; Simion, V.; Sperduto, M. L.; Steckmeyer, J.C.; Sutera, C.; Trifiró, A.; Tassan‐Got, L.; Trimarchi, M.; Vannini, G.; Vigilante, M.; Wilczyńskí, J.; Wu, Huiqin; Zhang, Xiao; Zetta, L.; Zipper, W.

doi:10.1016/s0168-9002(02)01008-2

Cited by 59 publications

(24 citation statements)

References 24 publications

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“…The excitation energy spectrum for 24 Mg shows no resonances in any determinable channel (6-α, 12 C(0 + 2 ) + 12 C(0 + 2 ), 8 Be + 8 Be + 8 Be) with the primary decay mode being sequential α-particle emission from 28 Si to the continuum. Taking multiplicity 6 events and reconstructing for a missing α-particle, the Q-value can be formulated, the results of which are seen in Fig.…”

Section: E Origins Of Magnesium-24mentioning

confidence: 94%

“…For particles which have sufficient energy to penetrate the 300 µm nominal thickness of silicon, the energy deposited in the silicon (∆E) was plotted against that left in the scintillator (E). This then allowed for PID via the observation of different loci according to the expected energy loss δE, through a small distance δx, given by the Bethe-Bloch formula δE δx ∝ mZ 2 /E [28]. This is the ∆E-E PID method.…”

Section: A Chimeramentioning

confidence: 99%

“…This calculation omits any modification to the Coulomb barrier by the mechanisms discussed in Section II, but, however, demonstrates this state cannot be observed in the 4-α decay channel in the current experiment. Instead, this state was investigated by looking for the decay of the compound nucleus 28 Si into 12 C(0 + 2 )+ 16 O(0 + 6 ) by measurement of the Hoyle state and reconstructing the 16 O where the decay mode is no longer inhibitive. Figure 27 showed no such state populated in connection to the Hoyle state.…”

Section: Measurement Of Near-threshold Statesmentioning

confidence: 99%

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Experimental investigation of α condensation in light nuclei

Bishop¹,

Kokalova²,

Freer³

et al. 2019

Phys. Rev. C

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Background: Near-threshold α-clustered states in light nuclei have been postulated to have a structure consisting of a diffuse gas of α-particles which condense into the 0s orbital. Experimental evidence for such a dramatic phase change in the structure of the nucleus has not yet been observed. Method:To examine signatures of this α-condensation, a compound nucleus reaction using 160, 280, and 400 MeV 16 O beams impinging on a carbon target was used to investigate the 12 C( 16 O, 7α) reaction. This permits a search for near-threshold states in the α-conjugate nuclei up to 24 Mg.Results: Events up to an α-particle multiplicity of 7 were measured and the results were compared to both an Extended Hauser-Feshbach calculation and the Fermi break-up model. The measured multiplicity distribution exceeded that predicted from a sequential decay mechanism and had a better agreement with the multi-particle Fermi break-up model. Examination of how these 7α final states could be reconstructed to form 8 Be and 12 C(0 + 2 ) showed a quantitative difference in which decay modes were dominant compared to the Fermi break-up model. No new states were observed in 16 O, 20 Ne, and 24 Mg due to the effect of the N-α penetrability suppressing the total α-particle dissociation decay mode. Conclusion:The reaction mechanism for a high energy compound nucleus reaction can only be described by a hybrid of sequential decay and multi-particle breakup. Highly α-clustered states were seen which did not originate from simple binary reaction processes. Direct investigations of near-threshold states in N-α systems are inherently impeded by the Coulomb barrier prohibiting the observation of states in the N-α decay channel. No evidence of a highly clustered 15.1 MeV state in 16 O was observed from ( 28 Si , 12 C(0 + 2 )) 16 O(0 + 6 ) when reconstructing the Hoyle state from 3 α-particles. Therefore, no experimental signatures for α-condensation were observed. arXiv:1907.05471v2 [nucl-ex]

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Section: E Origins Of Magnesium-24mentioning

confidence: 94%

Section: A Chimeramentioning

confidence: 99%

Section: Measurement Of Near-threshold Statesmentioning

confidence: 99%

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Experimental investigation of α condensation in light nuclei

Bishop¹,

Kokalova²,

Freer³

et al. 2019

Phys. Rev. C

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“…Details about the array and its detection and identification capabilities are described in Refs. [5,6,7,8,9]. The obtained mass resolution is around 5% for nuclei having masses A ≈ 50, that are typical of evaporation residues detected in this type of reactions because of the partial momentum transfer, characterizing incomplete fusion mechanisms, and of the abundant evaporation of light particles [10].…”

Section: Experimental Apparatusmentioning

confidence: 85%

Untitled

Lombardo¹,

Agodi²,

Amorini³

et al. 2011

Acta Phys. Pol. B

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Isospin effects on dynamics of semi-central collisions involving 40 Ca+ 40 Ca, 40 Ca+ 48 Ca and 48 Ca+ 48 Ca reactions at 25 MeV/nucleon have been investigated. For the selected class of events, the balance between the emission of evaporation residues and the presence of binary-like phenomena seems to be influenced by the neutron to proton ratio (N/Z) of entrance channels. In particular, for neutron-rich systems, evaporation residue emission is enhanced. Experimental observations confirm the key role played by the N/Z degree of freedom on nuclear dynamics at 25 MeV/nucleon.

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“…4, where the non-calibrated silicon vs CsI signals are reported, the ∆E-E technique gives easily a charge identification up to Z=50, when using 124 Sn beams. The same plot obtained for the low energy loss region (High Gain of the silicon QDC) allows an isotopic identification for Z up to 9 [11], as shown in fig 5. Energetic light particles going through the first stage without a detectable signal are identified in mass and charge by using a pulse shape discrimination method (PSD) consisting of a simple two gate method applied on the photodiode signals. One of the two energy outputs of photodiode amplifier is stretched and then integrated (rapid component), the second energy output is directly integrated in the tail, providing information on the slow component of CsI light emission.…”

Section: The Detector Performancesmentioning

confidence: 70%

Particle Identification with the 4π Chimera Detector Array

Politi¹,

Amorini²,

Anzalone³

et al.

IEEE Nuclear Science Symposium Conference Record, 2005

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Intermediate energy heavy ion collisions are unique probes to study the properties of nuclei far away from the nuclear ground state. The CHIMERA detector is a powerful second generation 4π array conceived to study nuclear reactions at intermediate energies. The array has 1192 detection cells covering almost 95% of total solid angle. The CHIMERA device operated at the Laboratori Nazionali del Sud in Catania in four campaigns in 2000, 2003, 2004 and 2005, showing very good performances in the detection and identification capabilities. Experimental results are presented, together with the improvement in progress to extend further the detection and identification capabilities.

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Mass and charge identification of fragments detected with the Chimera Silicon–CsI(Tl) telescopes

Cited by 59 publications

References 24 publications

Experimental investigation of α condensation in light nuclei

Experimental investigation of α condensation in light nuclei

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Particle Identification with the 4π Chimera Detector Array

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Mass and charge identification of fragments detected with the Chimera Silicon–CsI(Tl) telescopes

Cited by 59 publications

References 24 publications

Experimental investigation of α condensation in light nuclei

Experimental investigation of α condensation in light nuclei

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Particle Identification with the 4&#x03C0; Chimera Detector Array

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Particle Identification with the 4π Chimera Detector Array