Nuclear Stopping in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">A</mml:mi><mml:mi mathvariant="normal">u</mml:mi><mml:mo>+</mml:mo><mml:mi mathvariant="normal">A</mml:mi><mml:mi mathvariant="normal">u</mml:mi></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:msub></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi mathvariant="normal">G</mml:mi><mml:mi mathvariant="normal">e</mml:mi><mml:mi mathvariant="normal">V</mml:mi></mml:math>
I. G. BeardenNiels Bohr Institute, Blegdamsvej 17, University of Copenhagen, Copenhagen 2100, DenmarkD. BeavisBrookhaven National Laboratory, Upton, New York 11973C. BeşliuUniversity of Bucharest, RomaniaB. BudickNew York University, New York 10003H. BøggildNiels Bohr Institute, Blegdamsvej 17,C. ChasmanBrookhaven National Laboratory, Upton, New York 11973C. H. ChristensenUniversity of Copenhagen, Copenhagen 2100, DenmarkP. ChristiansenNiels Bohr Institute, Blegdamsvej 17,J. CiborInstitute of Nuclear Physics, Krakow, PolandR. DebbeBrookhaven National Laboratory, Upton, New York 11973E. EngerUniversity of Oslo, Department of Physics, Oslo, NorwayJ. J. GaardhøjeUniversity of Copenhagen, Copenhagen 2100, DenmarkM. GerminarioNiels Bohr Institute, Blegdamsvej 17,K. HagelTexas A&M University, College Station, Texas, 17843O. HansenNiels Bohr Institute, Blegdamsvej 17,Anders HolmNiels Bohr Institute, Blegdamsvej 17,A.K. HolmeUniversity of Oslo, Department of Physics, Oslo, NorwayH. ItoUniversity of Kansas, Lawerence, Kansas 66045A. JipaUniversity of Bucharest, RomaniaF. JundtJ. I. JørdreUniversity of Bergen, Department of Physics, Bergen, NorwayC.E. JørgensenUniversity of Copenhagen, Copenhagen 2100, DenmarkR. KarabowiczSmoluchkowski Inst. of Physics, Jagiellonian University, Krakow, PolandE. J. KimUniversity of Kansas, Lawerence, Kansas 66045T. KozikSmoluchkowski Inst. of Physics, Jagiellonian University, Krakow, PolandThomas Meinert LarsenUniversity of Oslo, Department of Physics, Oslo, NorwayJ. H. LeeBrookhaven National Laboratory, Upton, New York 11973Y. K. LeeJohns Hopkins University, Baltimore 21218G. LøvhøidenUniversity of Oslo, Department of Physics, Oslo, NorwayZ. MajkaSmoluchkowski Inst. of Physics, Jagiellonian University, Krakow, PolandA. MakeevTexas A&M University, College Station, Texas, 17843M. MikelsenUniversity of Oslo, Department of Physics, Oslo, NorwayM. MurrayTexas A&M University, College Station, Texas, 17843J. B. NatowitzTexas A&M University, College Station, Texas, 17843B. S. NielsenUniversity of Copenhagen, Copenhagen 2100, DenmarkJ. P. NorrisUniversity of Kansas, Lawerence, Kansas 66045K. OlchanskiBrookhaven National Laboratory, Upton, New York 11973D. OuerdaneNiels Bohr Institute, Blegdamsvej 17,R. PłanetaSmoluchkowski Inst. of Physics, Jagiellonian University, Krakow, PolandF. RamiC. RisteaUniversity of Bucharest, RomaniaD. RöhrichUniversity of Bergen, Department of Physics, Bergen, NorwayB. H. SamsetUniversity of Oslo, Department of Physics, Oslo, NorwayD. SandbergUniversity of Copenhagen, Copenhagen 2100, DenmarkS. J. SandersUniversity of Kansas, Lawerence, Kansas 66045R.A. ScheetzBrookhaven National Laboratory, Upton, New York 11973P. StaszelNiels Bohr Institute, Blegdamsvej 17,T. S. TveterUniversity of Oslo, Department of Physics, Oslo, NorwayF. VidebækBrookhaven National Laboratory, Upton, New York 11973R. WadaTexas A&M University, College Station, Texas, 17843Zhongbao YinUniversity of Bergen, Department of Physics, Bergen, NorwayI. S. ZgurăUniversity of Bucharest, Romania
2004lv
ABI
Abstract
Transverse momentum spectra and rapidity densities, $dN/dy$, of protons, antiprotons, and net protons ($p\ensuremath{-}\overline{p}$) from central (0%--5%) $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$ were measured with the BRAHMS experiment within the rapidity range $0\ensuremath{\le}y\ensuremath{\le}3$. The proton and antiproton $dN/dy$ decrease from midrapidity to $y=3$. The net-proton yield is roughly constant for $y<1$ at $dN/dy\ensuremath{\sim}7$, and increases to $dN/dy\ensuremath{\sim}12$ at $y\ensuremath{\sim}3$. The data show that collisions at this energy exhibit a high degree of transparency and that the linear scaling of rapidity loss with rapidity observed at lower energies is broken. The energy loss per participant nucleon is estimated to be $73\ifmmode\pm\else\textpm\fi{}6\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$.
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