Charmonium suppression in a baryon-rich quark-gluon plasma

Bhaduri, Partha Pratim; Chaudhuri, A. K.; Chattopadhyay, Subhasis

doi:10.1103/physrevc.88.061902

Cited by 10 publications

(17 citation statements)

References 43 publications

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“…This can be explained by the fact that the inversion of the standard sd-shell configuration and pf-shell intruder configuration as it has been proved in Refs. [18,48] in the case of 32 Mg. On the other hand, the microscopic theories show that N = 20 is a magic number. It seems rather that these theories are failing in this respect.…”

Section: Neutron Pairing Gapmentioning

confidence: 99%

Neutron shell closure at N = 32 and N = 40 in Ar and Ca isotopes

Adri

Oulne

2020

Eur. Phys. J. Plus

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In this paper, we investigate features of the ground state of some nuclei far from the stability for isotope chains with proton numbers Z=18 and 20. Our aim is to predict the eventual existence of magic numbers in these exotic nuclei. For this purpose, we use two methods: the non relativistic Hartree-Fock-Bogoliubov (HFB) approach based on SLy4 Skyrme functional and the relativistic (so-called covariant) density functional theory (CDFT) by using the DD-ME2 force parametrization. We compare our results with the available experimental data and with the predictions of other models such as Finite Range Droplet Model (FRDM). Our present investigation predicts that N=32 and N=40 are magic numbers for Ar and Ca isotopes.

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Section: Neutron Pairing Gapmentioning

confidence: 99%

Neutron shell closure at N = 32 and N = 40 in Ar and Ca isotopes

Adri

Oulne

2020

Eur. Phys. J. Plus

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“…The situation is less clear for N=82 but, still, one can assume that magicity quenching can, in principle, occur here as well. Recent experimental data [33,34] corresponding to N = 20 magic number show that magicity quenching in neutron rich nuclei is to be expected. Indeed, while a huge gap is obtained for decreasing proton number up to 34 Si, no gap is found for the even-even isotope 32 Mg.…”

Section: Pos(mpcs2015)005mentioning

confidence: 99%

“…Recent experimental data [33,34] corresponding to N = 20 magic number show that magicity quenching in neutron rich nuclei is to be expected. Indeed, while a huge gap is obtained for decreasing proton number up to 34 Si, no gap is found for the even-even isotope 32 Mg. This effect is due to both modification of single-particle energies far from stability and, more importantly, correlations which go beyond the single-particle shell model picture.…”

Section: Pos(mpcs2015)005mentioning

confidence: 99%

Magicity quenching in neutron-rich nuclei and its consequences on electron-capture rates during core collapse

Raduta¹,

Gulminelli²,

Oertel³

2016

Proceedings of the Modern Physics of Compact Stars 2015 — PoS(MPCS2015)

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We study the impact of masses of very neutron-rich nuclei on matter composition and average electron capture rates during the late stages of pre-bounce evolution of core-collapsing massive stars. Inspired by experimental data which show magicity quenching in nuclei far from stability, we test the consequences of a possible quenching of shell closure in nuclei with N=50 and 82. By using parametrized equations for electron-capture rates and empirical modifications of the DufloZucker mass formula, we show that magicity quenching in neutron-rich nuclei may increase the electron-capture rates by up to 30%. Our results show the importance of new experimental data on nuclear masses and electron capture rates for neutron-rich nuclei in the vicinity of N = 50 and N = 82.

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“…The feasibility of measuring the charmonium production at the energy SIS300 of the FAIR project was previously studied in di-electron decay [45] and in di-muon decay [46]. For Au-Au central collisions the multiplicity of the J/ψ production per event calculated in HadronString-Dynamics (HSD) transport model [47] at 35 A GeV energy.…”

Section: Charmonium Production At the Nica Mpdmentioning

confidence: 99%

Solving the problem of anomalous J/ $\psi$ suppression by the MPD experiment on the NICA collider

Kurepin

Topilskaya

2016

Eur. Phys. J. A

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Abstract. The meassurements of charmonium states production via their decay on lepton pairs by the MPD experiment on the NICA collider at the energies √ sNN = 4-11 GeV per nucleon could provide important data for solving the problem of anomalous J/ψ suppression first observed in central Pb-Pb collisions by the NA50 Collaboration at 158 GeV/nucleon. The anomalous J/ψ suppression could be due to the formation of the QGP in the central heavy-ion collisions. However, this effect could be also interpreted as the result of the comover interactions in nuclear matter. The recent experiments at the SPS, at the RHIC, and the LHC reviewed in this article indicate a more complicated picture of the J/ψ production including the recombination, medium effects, parton shadowing, and the coherent energy loss mechanism. A more simple production mechanism could be expected at low colliding energies. However, no data were obtained at energies below √ sNN = 17 GeV for heavy-ion collisions. After the short review of the whole set of the data of charmonium states observation the estimation of the production rate for the MPD/NICA is made. Charmonium production at the CERN SPSThe measurement of charmonium states production via their decay on lepton pairs is a useful tool for the investigation of the properties of hot and dense matter created in heavy-ion collisions. The existence of the QuarkGluon Plasma (QGP) is predicted by lattice QCD at high temperature and large energy density. The dissociation of heavy-quark resonances by color screening in a deconfined medium was suggested by Matsui and Satz as a possible signal of the Quark-Gluon Plasma formation in ultrarelativistic heavy-ion collisions [1].Charmonium production has been previously studied at the CERN SPS by NA3 The NA60 results in p-A collisions at 400 GeV confirm the NA50 values of absorption cross section at the same energy. On the other hand, the NA60 158 GeV p-A data give higher values of absorption. The energy dependence of the absorption cross section was observed. However, the older NA3 J/ψ results at 200 GeV [2] give the values of absorption cross section similar to those obtained at the higher energy. This difference has not yet been satisfactorily explained. Therefore, it is important to measure the charmonium production cross sections in different energy domains in p-p and p-A collisions to investigate the energy dependence of cold nuclear matter effects. The cold nuclear matter effect (CNM) in the suppression of the J/ψ production includes not only nuclear absorption, but also the shadowing effect, i.e. the modification of the parton distribution function in nuclear matter compared to the free nucleon. If shadowing is taken into account, the amount of the anomalous J/ψ suppression is reduced. Also, it is necessary to consider the energy loss of partons in nuclear matter. The charmonium can also interact with surrounding comovers and lose energy or even break up.For In-In collisions at 158 GeV per nucleon after accounting for the effects of cold nuclear matter the ad...

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Charmonium suppression in a baryon-rich quark-gluon plasma

Cited by 10 publications

References 43 publications

Neutron shell closure at N = 32 and N = 40 in Ar and Ca isotopes

Neutron shell closure at N = 32 and N = 40 in Ar and Ca isotopes

Magicity quenching in neutron-rich nuclei and its consequences on electron-capture rates during core collapse

Solving the problem of anomalous J/ $\psi$ suppression by the MPD experiment on the NICA collider

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