Commissioning of the ALPI post-accelerator

Dainelli, A.; Bassato, G.; Battistella, A.; Bellato, M.; Beltramin, A.; Bertazzo, L.; Bezzon, G.; Bisoffi, G.; Boscagli, L.; Canella, S.; Carlucci, Donald E.; Cervellera, F.; Chiurlotto, F.; Contran, T.; Lazzari, M. De; Facco, A.; Favaron, P.; Fortuna, G.; Gustafsson, S.; Lollo, M.; Lombardi, A.; Marigo, S.; Moisio, M.F.; Palmieri, V.; Pengo, R.; Pisent, A.; Poggi, M.; Poletto, Fabio; Porcellato, A.M.; Ziomi, L.

doi:10.1016/s0168-9002(96)00456-1

Cited by 14 publications

(8 citation statements)

References 4 publications

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“…Two experiments were performed, using different fusionevaporation reactions, to populate the excited states in 188 Hg. In the first one, a 34 S beam at 185 MeV energy impinged on a 600 μg/cm 2 thick target of 160 Gd, evaporated onto a 2.5 mg/cm 2 thick 181 Ta foil. The second one used a 34 S beam at the energy of 165 MeV and a 600 μg/cm 2 thick target of 158 Gd evaporated on an identical foil.…”

Section: Methodsmentioning

confidence: 99%

“…In the first one, a 34 S beam at 185 MeV energy impinged on a 600 μg/cm 2 thick target of 160 Gd, evaporated onto a 2.5 mg/cm 2 thick 181 Ta foil. The second one used a 34 S beam at the energy of 165 MeV and a 600 μg/cm 2 thick target of 158 Gd evaporated on an identical foil. In both experiments, the targets were oriented such that the beams first passed through the Ta foils before striking the target material.…”

Section: Methodsmentioning

confidence: 99%

“…2, this approach provided a better control of possible contamination of the 188 Hg data by other reaction channels. The 34 beam was provided by the Tandem-ALPI accelerator complex [33,34] of the Laboratori Nazionali di Legnaro (Italy). The γ rays resulting from the reactions were detected by the GALILEO spectrometer, an array of 25 Compton-shielded HPGe detectors, arranged into three rings at backward angles (152 • , 129 • , 119 • ) and one ring at 90 • [35] with respect to the beam direction.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Shape coexistence in neutron-deficient Hg188 investigated via lifetime measurements

Siciliano¹,

Zanon²,

Goasduff³

et al. 2020

Phys. Rev. C

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Shape coexistence in neutron-deficient Hg188 investigated via lifetime measurements

Siciliano¹,

Zanon²,

Goasduff³

et al. 2020

Phys. Rev. C

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“…As the cross sections for individual reaction channels were different for Exp.1 and Exp.2, this approach provided a better control of possible contamination of the 188 Hg data by other reaction channels. The 34 S beam was provided by the Tandem-ALPI accelerator complex [33,34] of the Laboratori Nazionali di Legnaro (Italy). The γ rays resulting from the reactions were detected by the GALILEO spectrometer, an array of 25 Compton-shielded HPGe detectors, arranged into 3 rings at backward angles (152 • , 129 • , 119 • ) and one ring at 90 • [35] with respect to the beam direction.…”

Section: Methodsmentioning

confidence: 99%

Shape coexistence in the neutron-deficient $^{188}$Hg investigated via lifetime measurements

Siciliano,

Zanon,

Goasduff

et al. 2020

Preprint

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Background: Shape coexistence in the Z ≈ 82 region has been established in mercury, lead and polonium isotopes. For even-even mercury isotopes with 100 ≤ N ≤ 106 multiple fingerprints of this phenomenon are observed, which seems to be no longer present for N ≥ 110. According to a number of theoretical calculations, shape coexistence is predicted in the 188 Hg isotope. Purpose: The aim of this work was to measure lifetimes of excited states in 188 Hg to infer their collective properties, such as the deformation. Extending the investigation to higher-spin states, which are expected to be less affected by band-mixing effects, can provide additional information on the coexisting structures. Methods: The 188 Hg nucleus was populated using two different fusion-evaporation reactions with two targets, 158 Gd and 160 Gd, and a beam of 34 S provided by the Tandem-ALPI accelerator complex at the Laboratori Nazionali di Legnaro. The channels of interest were selected using the information from the Neutron Wall array, while the γ rays were detected using the GALILEO γ-ray spectrometer. Lifetimes of excited states were determined using the Recoil Distance Doppler-Shift method, employing the dedicated GALILEO plunger device. Results: Lifetimes of the states up to spin 16 were measured and the corresponding reduced transition probabilities were calculated. Assuming two-band mixing and adopting, as done commonly, the rotational model, the mixing strengths and the deformation parameters of the unperturbed structures were obtained from the experimental results. In order to shed light on the nature of the observed configurations in the 188 Hg nucleus, the extracted transition strengths were compared with those resulting from state-of-the-art beyond-mean-field calculations using the symmetry-conserving configuration-mixing approach, limited to axial shapes, and the 5-dimensional collective Hamiltonian, including the triaxial degree of freedom. Conclusions: The first lifetime measurement for states with spin ≥ 6 suggested the presence of an almost spherical structure above the 12 + 1 isomer and allowed elucidating the structure of the intruder band. The comparison of the extracted B(E2) strengths with the two-band mixing model allowed the determination of the ground-state band deformation. Both beyond-mean-field calculations predict coexistence of a weakly-deformed band with a strongly prolate-deformed one, characterized by elongation parameters similar to those obtained experimentally, but the calculated relative position of the bands and their mixing strongly differ.

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“…The ALPI post-accelerator [14] increases the energy of the heavy ion beams produced by the Tandem by a factor 3-4, allowing SEE studies of devices with thick superficial layers of metallization and back-side irradiation. Post-accelerated beams will be available at SIRAD from 2012.…”

Section: The Lnl Existing Facilitiesmentioning

confidence: 99%

A new irradiation facility for neutron-induced Single Event Effect studies at LNL

Bisello

Candelori

Dzysiuk

et al. 2011

2011 12th European Conference on Radiation and Its Effects on Components and Systems

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This paper describes the project of a new neutron irradiation facility for studying neutron-induced Single Event Effects in electronic devices and systems. The facility will be installed at the next future high-current (500 μA) variable-energy (35-70 MeV) cyclotron of the INFN National Laboratory of Legnaro (LNL), Padova, Italy, and it will offer an atmosphericlike and monochromatic neutron beams, beyond of the straightforward proton beam. These beams will integrate the proton and heavy ions facilities presently operating at the LNL for radiation damage studies on semiconductor detectors and electronic devices.

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Commissioning of the ALPI post-accelerator

Cited by 14 publications

References 4 publications

Shape coexistence in neutron-deficient Hg188 investigated via lifetime measurements

Shape coexistence in neutron-deficient Hg188 investigated via lifetime measurements

Shape coexistence in the neutron-deficient $^{188}$Hg investigated via lifetime measurements

A new irradiation facility for neutron-induced Single Event Effect studies at LNL

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