Measurements of light nuclei production in 11.5-A-GeV/c Au + Pb heavy ion collisions

The E864 collaboration Armstrong, T.A. ; Barish, K.N. ; Batsouli, S. ; et al.
Phys.Rev. C61 (2000) 064908, 2000.
Inspire Record 525664 DOI 10.17182/hepdata.25465

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.

14 data tables

10 pct most central collisions.

10 to 38 pct most central collisions.

38 to 66 pct most central collisions.


Anti-deuteron yield and coalescence implications at the AGS

The E864 collaboration Van Buren, G. ;
Nucl.Phys. A661 (1999) 391-394, 1999.
Inspire Record 514769 DOI 10.17182/hepdata.36101
2 data tables

No description provided.


E864: Experimental results on exotic nuclei and rare probes

The E864 collaboration Nagle, J.L. ;
Nucl.Phys. A661 (1999) 185-190, 1999.
Inspire Record 503979 DOI 10.17182/hepdata.36100

Experiment 864 at the BNL-AGS was designed to search for exotic states of strange quark matter and other rare composite particles. The experiment was commissioned in 1994 and completed its final run in 1998. Here, we present an overview of the experimental results for the production of light nuclei up to A=7, antiprotons and antideuterons, hypernuclei and production limits on new states of quark matter.

1 data table

No description provided.

Measurements of neutrons in 11.5-A-GeV/c Au + Pb heavy ion collisions

The E864 collaboration Armstrong, T.A. ; Barish, K.N. ; Batsouli, S. ; et al.
Phys.Rev. C60 (1999) 064903, 1999.
Inspire Record 506495 DOI 10.17182/hepdata.31358

We present measurements from Brookhaven Experiment 864 of neutron invariant multiplicity in 11.5 A GeV/c Au+Pb collisions. The measurements span a rapidity range from center-of-mass to beam rapidity (y(beam)=3.2) and are presented as a function of event centrality. The results are compared with E864 measurements of proton invariant multiplicity and an average n/p ratio at hadronic freeze-out of 1.19+-.08 is determined for the rapidity range y=1.6 to y=2.4. We discuss briefly the implications of this ratio within a simple equilibrium model of the collision system.

1 data table

The errors are statistical and systematic errors added in quadrature. 10% most central events.

Anti-proton production and anti-deuteron production limits in relativistic heavy ion collisions from BNL experiment 864

The E864 collaboration Armstrong, T.A. ; Barish, K.N. ; Batsoulli, S. ; et al.
Phys.Rev. C59 (1999) 2699-2712, 1999.
Inspire Record 478873 DOI 10.17182/hepdata.31371

We present results from Experiment 864 for antiproton production and antideuteron limits in Au + Pb collisions at 11.5 GeV/c per nucleon. We have measured invariant multiplicities for antiprotons for rapidities 1.4&lt;y&lt;2.4 at low transverse momentum as a function of collision geometry. When compared with the results from Experiment 878 our measurements suggest a significant contribution to the measured antiproton yield from the decay of strange antibaryons. We have also searched for antideuterons and see no statistically significant signal. Thus, we set upper limits on the production at approximately 3 x 10^{-7} per 10% highest multiplicity Au + Pb interaction.

7 data tables





Search for exotic strange quark matter in high-energy nuclear reactions

The E864 collaboration Armstrong, T.A. ; Barish, K.N. ; Bennett, S.J. ; et al.
Nucl.Phys. A625 (1997) 494-512, 1997.
Inspire Record 446705 DOI 10.17182/hepdata.36251

We report on a search for metastable positively and negatively charged states of strange quark matter in Au+Pb reactions at 11.6 A GeV/c in experiment E864. We have sampled approximately six billion 10% most central Au+Pb interactions and have observed no strangelet states (baryon number A < 100 droplets of strange quark matter). We thus set upper limits on the production of these exotic states at the level of 1-6 x 10^{-8} per central collision. These limits are the best and most model independent for this colliding system. We discuss the implications of our results on strangelet production mechanisms, and also on the stability question of strange quark matter.

1 data table


Search for strange quark matter produced in relativistic heavy ion collisions

The E864 collaboration Armstrong, T.A. ; Barish, K.N. ; Batsouli, S. ; et al.
Phys.Rev. C63 (2001) 054903, 2001.
Inspire Record 535783 DOI 10.17182/hepdata.31785

We present the final results from Experiment 864 of a search for charged and neutral strange quark matter produced in interactions of 11.5 GeV/c per nucleon Au beams with Pt or Pb targets. Searches were made for strange quark matter with A&gt;4. Approximately 30 billion 10% most central collisions were sampled and no strangelet states with A&lt;100 were observed. We find 90% confidence level upper limits of approximately 10^{-8} per central collision for both charged and neutral strangelets. These limits are for strangelets with proper lifetimes greater than 50 ns. Also limits for H^{0}-d and pineut production are given. The above limits are compared with the predictions of various models. The yields of light nuclei from coalescence are measured and a penalty factor for the addition of one nucleon to the coalescing nucleus is determined. This is useful in gauging the significance of our upper limits and also in planning future searches for strange quark matter.

9 data tables

No description provided.

No description provided.

No description provided.