First results from the INDRA-FAZIA apparatus on isospin diffusion in 58,64 Ni+58,64 Ni systems at Fermi energies

An investigation of the isospin equilibration process in the reactions 58;64Ni+58;64Ni at two bombarding energies in the Fermi regime (32 MeV/nucleon and 52 MeV/nucleon) is presented. Data have been acquired during the first experimental campaign of the coupled INDRA-FAZIA apparatus in GANIL. Selecting from peripheral to semi-central collisions, both the neutron content of the quasiprojectile residue and that of the light ejectiles coming from the quasiprojectile evaporation have been used as probes of the dynamical process of isospin diffusion between projectile and target for the asymmetric systems. The isospin transport ratio technique has been employed. The relaxation of the initial isospin imbalance with increasing centrality has been clearly evidenced. The isospin equilibration appears stronger for the reactions at 32 MeV/nucleon, as expected due to the longer projectile-target interaction time than at 52 MeV/nucleon. Coherent indications of isospin equilibration come from the quasiprojectile residue characteristics and from particles ascribed to the quasiprojectile decay.This work was partially supported by the National Research Foundation of Korea (NRF; Grant No. 2018R1A5A1025563) and by the Spanish Ministerio de Econom a y Empresa (PGC2018-096994-B-C22). We acknowledge support from R egion Normandie under R eseau d'Int er^et Normand FIDNEOS (RIN/FIDNEOS). Many thanks are due to the accelerator sta of GANIL for delivering a very good quality beam and to the technical sta for the continuous support

Nuclear symmetry energy at work in heavy ion reactions: new results from the INDRA-FAZIA apparatus

The recently coupled INDRA-FAZIA apparatus offers unique opportunities to investigate heavy ion collisions at Fermi energies by combining the optimal identification capabilities of FAZIA and the large angular coverage of INDRA. We present a selection of the results of the analysis of the first experimental campaign performed with INDRA-FAZIA, in which the four reactions Ni-58,Ni-64+Ni-58,Ni-64 have been studied at two different beam energies (32 and 52 MeV/nucleon) in the intermediate energy regime. The present work is focused on the isospin diffusion effects in semiperipheral and peripheral collisions. A stronger isospin equilibration is found at 32 MeV/nucleon than at 52 MeV/nucleon, as expected due to a shorter projectile-target interaction time in the latter cas

GALTRACE: A highly segmented silicon detector array for charged particle spectroscopy and discrimination

GALTRACE is an array of segmented silicon detectors specifically built to work as an ancillary of the GALILEO γ-ray spectrometer at Legnaro National Laboratory of INFN. GALTRACE consists of four telescopic ΔE-E detectors which allow discriminating light charged particles also via pulse-shape analysis techniques. The good angular and energy resolutions, together with particle discrimination capabilities, make GALTRACE suitable for experiments where coincidences with specific emitted particles allow for the selection of reaction channels with very low cross section. The first in-beam experiment is reported here, aiming at identifying a narrow resonance, near-proton-threshold state in 11B, currently under discussion

The 46Ar(3He, d)47K direct reaction as a probe of the 46Ar proton wavefunction

Journal of Physics: Conference Series PAPER • THE FOLLOWING ARTICLE ISOPEN ACCESS The 46Ar(3He, d)47K direct reaction as a probe of the 46Ar proton wavefunction D Brugnara1, A Gottardo1, M Assié2, D Mengoni3,4, A Lemasson5, E Clement5, F Flavigny6, D Ramos5, F Galtarossa2, A Matta6, V Girard-Alcindor2, M Babo2, D Bazzacco3, D Beaumel2, Y Blumenfeld2, S Bottoni7, U Datta8, G de Angelis1, G de France5, J Dudouet9, J Duenas10, A Goasduff1, E T Gregor1, F Hammache2, A Illana1, L Lalanne2, S Leblond11, I Lombardo12, N Marchini13, B Million7, F Recchia4, K Rezynkina3,4, M Rocchini13, J S Rojo14, M Siciliano11, J J Valiente-Dobón1, I Zanon1 and M Zielinska11 Hide full author list Published under licence by IOP Publishing Ltd Journal of Physics: Conference Series, Volume 2586, 28th International Nuclear Physics Conference (INPC 2022) 11/09/2022 - 16/09/2022 Cape Town, South Africa Citation D Brugnara et al 2023 J. Phys.: Conf. Ser. 2586 012073 DOI 10.1088/1742-6596/2586/1/012073 DownloadArticle PDF References Download PDF Article metrics 17 Total downloads MathJax Turn on MathJax Share this article Share this content via email Share on Facebook (opens new window) Share on Twitter (opens new window) Share on Mendeley (opens new window) Article and author information Abstract The discrepancy between shell-model calculations and intermediate-energy Coulomb excitation measurements in 46Ar still stands as an unsolved puzzle in understanding the N = 28 shell evolution. This phenomenon has significant relevance considering the remarkable achievements of the shell model and the SDPF-U interaction in the region which is able to predict the fading of the N = 28 shell gap in neutron-rich 44S. Recent measurements narrowed down this discrepancy to an overestimation of the proton amplitude to the quadrupole transition matrix element. The current work aims to propose a different perspective on the puzzle, by studying a direct proton-transfer reaction on 46Ar as a means to directly probe the proton wavefunction of the ground state this isotope. By measuring the amount of l = 0 transfer to the ground state (1/2+) of 47K with respect to the l = 2 to the first excited state (3/2+), we aim to gain insight into the ground state proton wavefunction of 46Ar. We will present a brief description of the experiment performed at the SPIRAL1 facility in GANIL (France). The experimental apparatus allowed a full reconstruction of the two-body reaction thanks to the combination of AGATA, VAMOS, MUGAST, CATS2, and HECTO

Octupole correlations near 110Te

The lifetime of the 2+ and 9-, 11-, 13-, 15- states in the neutron-deficient 110Te was measured for the first time using the recoil distance Doppler shift technique. The reported value of the reduced transition probability B(E2;0+g.s?2+)=4.3(8)×103e2fm4 supports the systematic for even-mass Te isotopes and was interpreted in the framework of the large-scale shell model and cranked shell model calculations. The measured reduced transition probabilities in the negative-parity yrast band revealed the upward trend towards the high spins. The enhanced collectivity is discussed in terms of the tilted axis cranking approach and the symmetry configuration mixing method with the Gogny D1S interaction.The authors would like to thank the technical staff of the LNL Legnaro facility for their assistance in providing excellent operation of the XTU-tandem accelerator. The authors wish to acknowledge the support of local engineers P. Cocconi and R. Isocrate. The work was partially supported by the DoE Grant No. DE-FG02-95ER4093 and Spanish MICINN Grant No. PGC2018-094583-B-I00

Deep excursion beyond the proton dripline. I. Argon and chlorine isotope chains

The proton-unbound argon and chlorine isotopes have been studied by measuring trajectories of their decay-in-flight products by using a tracking technique with micro-strip detectors. The proton (1p) and two-proton (2p) emission processes have been detected in the measured angular correlations “heavy-fragment”+p and “heavy-fragment”+p+p, respectively. The ground states of the previously unknown isotopes 30Cl and 28Cl have been observed for the first time, providing the 1p separation energies Sp of −0.48(2) and −1.60(8) MeV, respectively. The relevant systematics of 1p and 2p separation energies have been studied theoretically in the core+p and core+p+p cluster models. The first-time observed excited states of 31Ar allow to infer the 2p-separation energy S2p of 6(34) keV for its ground state. The first-time observed state in 29Ar with S2p = −5.50(18) MeV can be identified either as a ground or an excited state according to different systematics.This work was supported in part by the Helmholtz International Center for FAIR (HIC for FAIR); the Helmholtz Association (Grant No. IK-RU-002); the Russian Science Foundation (Grant No. 17-12-01367); the Polish National Science Center (Contract No. UMO-2015/17/B/ST2/00581); the Polish Ministry of Science and Higher Education (Grant No. 0079/DIA/2014/43, Grant Diamentowy); the Helmholtz-CAS Joint Research Group (Grant No. HCJRG-108); the Ministry of Education & Science, Spain (Contract No. FPA2016-77689-C2-1-R); the Hessian Ministry for Science and Art (HMWK) through the LOEWE funding scheme Helmholtz International Center for FAIR (HIC for FAIR); the Justus-Liebig-Universitat Giessen (JLU) and the GSI under the JLU-GSI strategic Helmholtz partnership agreement. This work was carried out in the framework of the Super-FRS Experiment collaboration. This article is a part of the Ph.D. thesis of D. Kostyleva

Deep excursion beyond the proton dripline. II. Towards the limits of nuclear structure existence

Prospects of experimental studies of argon and chlorine isotopes located far beyond the proton dripline are studied by using systematics and cluster models. The deviations from the widespread systematics observed in 28 , 29 Cl and 29 , 30 Ar have been theoretically substantiated, and analogous deviations have been predicted for the lighter chlorine and argon isotopes. The limits of nuclear structure existence are predicted for Ar and Cl isotopic chains, with 26 Ar and 25 Cl found to be the lightest sufficiently long-living nuclear systems. By simultaneous measurements of protons and γ rays following decays of such systems as well as their β -delayed emission, an interesting synergy effect may be achieved, which is demonstrated by the example of 30 Cl and 31 Ar ground-state studies. Such a synergy effect may be provided by the new EXPERT setup (EXotic Particle Emission and Radioactivity by Tracking) being operated inside the fragment separator and spectrometer facility at GSI, Darmstadt.This work was supported in part by the Hessian Ministry for Science and Art (HMWK) through the LOEWE funding scheme Helmholtz International Center for FAIR (HIC for FAIR); the Helmholtz Association (Grant No. IK-RU-002); the Russian Science Foundation (Grant No. 17-12-01367); the Polish National Science Center (Contract No. UMO-2015/17/B/ST2/00581); the Polish Ministry of Science and Higher Education (Grant No. 0079/DIA/2014/43, Grant Diamentowy); the Helmholtz-CAS Joint Research Group (Grant No. HCJRG-108); the Ministry of Education & Science, Spain (Contract No. FPA2016-77689-C2-1-R); the Ministry of Education, Youth and Sports, Czech Republic (Projects No. LTT17003 and No. LM2015049); and the Justus-Liebig-Universitat Giessen (JLU) and the GSI under the JLU-GSI strategic Helmholtz partnership agreement. This work was carried out in the framework of the Super-FRS Experiment collaboration. This article is a part of the Ph.D. thesis of D. Kostyleva

Magnetic influence on water evaporation rate: an empirical triadic model

Over the past decades researchers have described what happens to the water when a polarizing external field is applied to it and changes the bonding forces existing in it. Water evaporation, an essential process in nature, has been targeted in a great number of studies. In this paper, static magnetic fields ranging from 30-to-200 mT were applied to circulating purified water to study their effect on how the evaporation rate changed under different ambient conditions. A statistical approach was employed to verify the significance of the magnetically induced effect. Our results showed that by applying a static magnetic field to the water, the evaporation rate increased at lower temperatures, yielding an evaporation increase for magnetized water of up to at 6 °C. We found too that the circulation of the water did not contribute significantly to the evaporation rate. We used an empirical triadic model to correlate the applied magnetic field with the ambient parameters of temperature and humidity.This work was supported in part by the Ministerio de Ciencia, Innovación y Universidades (ID: PGC2018-096994-B-C22), the Ministerio de Economía y Competitividad -Infraestructura FEDER- (ID: EQC2018-004395-P), and by Funding for open access charge: Universidad de Huelva/ CBUA

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