Results on the production of 4 He and He‾4 nuclei in Pb–Pb collisions at s NN =2.76TeV in the rapidity range |y|<1, using the ALICE detector, are presented in this paper. The rapidity densities corresponding to 0–10% central events are found to be dN/dy He4 =(0.8±0.4(stat)±0.3(syst))×10 −6 and dN/dy He‾4 =(1.1±0.4(stat)±0.2(syst))×10 −6 , respectively. This is in agreement with the statistical thermal model expectation assuming the same chemical freeze-out temperature (T chem =156MeV) as for light hadrons. The measured ratio of He‾4/ 4 He is 1.4±0.8(stat)±0.5(syst).
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics