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The E864 Collaboration

Publications and source records attributed to The E864 Collaboration.

4 recordsLinked to original sources
arXiv2000

Measurements of Light Nuclei Production in 11.5 A GeV/c Au+Pb Heavy-Ion Collisions

We report on measurements by the E864 experiment at the BNL-AGS of the yields of light nuclei in collisions of Au(197) with beam momentum of 11.5 A GeV/c on targets of Pb(208) and Pt(197). The yields are reported for nuclei with baryon number A=1 up to A=7, and typically cover a rapidity range from y(cm) to y(cm)+1 and a transverse momentum range of approximately 0.1 < p(T)/A < 0.5 GeV/c. We calculate coalescence scale factors B(A) from which we extract model dependent source dimensions and collective flow velocities. We also examine the dependences of the yields on baryon number, spin, and isospin of the produced nuclei.

nucl-ex↗
arXiv1999

Mass dependence of light nucleus production in ultrarelativistic heavy ion collisions

Light nuclei can be produced in the central reaction zone via coalescence in relativistic heavy ion collisions. E864 at BNL has measured the production of ten light nuclei with nuclear number of A=1 to A=7 at rapidity $y\simeq1.9$ and $p_{T}/A\leq300MeV/c$. Data were taken with a Au beam of momentum of 11.5 A $GeV/c$ on a Pb or Pt target with different experimental settings. The invariant yields show a striking exponential dependence on nuclear number with a penalty factor of about 50 per additional nucleon. Detailed analysis reveals that the production may depend on the spin factor of the nucleus and the nuclear binding energy as well.

nucl-ex↗
arXiv1999

Production of Light (anti-)Nuclei with E864 at the AGS

Light nuclei can be produced in the central reaction zone via coalescence in relativistic heavy ion collisions. E864 at BNL has measured the production of ten stable light nuclei with nuclear number of A=1 to A=7 at rapidity $y\simeq1.9$ and $p_{T}/A\leq300MeV/c$. Data were taken with a Au beam of momentum of 11.5 A $GeV/c$ on a Pb or Pt target with different experimental settings. The invariant yields show a striking exponential dependence on nuclear number over ten orders of magnitudes with a penalty factor of about 50 per additional nucleon. This penalty factor is used to estimate the strange quark matter (strangelet) production in the baryon rich and strangeness enhanced environment. The measurements of the production of antiproton, antideuteron, hypernuclei ($^{3}_ΛH$,$^{4}_ΛH$), and strongly unstable nuclear states ($^{4}H$,$^{5}Li$, $^{5}Li^{*}$, $^{5}He$) are presented as well. A model of local thermal equilibrium with radial flow at the kinetic freeze-out with a temperature of $T=112\pm10MeV$, chemical potential of $μ_{B}=503\pm20MeV$ and flow velocity of about $\sqrt{V_{\perp}^{2}}\simeq0.5c$ seems to be able to describe the data in the gross scale with the exceptions of the production of antihyperons and hypernuclei. The large antihyperon production and the extra penalty for hypernuclei production are quite surprising.

nucl-ex↗