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Adler, Jeffrey S.; Rogers, William Warren; Denham, John

doi:10.2307/30039998

Cited by 3 publications

(3 citation statements)

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“…The four RHIC experiments have mid-rapidity spectrometers with different characteristics but all share identical Zero Degree Calorimeters (ZDC's) located at ±18 m. The ZDC's cover ±5 cm (in x and y) about the forward beam direction and have an energy resolution of σ E /E < 21% for 100 GeV neutrons within x,y≤ 4.5 cm [3,4]. Essentially, all non-interaction ("spectator") neutrons are detected in the ZDC's, while charged particles are mostly swept out of the ZDC region by strong ( 16T · m) accelerator dipoles at z= ±11m.…”

Section: Instrumentationmentioning

confidence: 99%

Diffraction Dissociation — 50 Years later

White¹

2005

AIP Conference Proceedings

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The field of Diffraction Dissociation, which is the subject of this workshop, began 50 years ago with the analysis of deuteron stripping in low energy collisions with nuclei. We return to the subject in a modern context-deuteron dissociation in √ s NN = 200 GeV d-Au collisions recorded during the 2003 RHIC run in the PHENIX experiment. At RHIC energy, d→n+p proceeds predominantly (90%) through Electromagnetic Dissociation and the remaining fraction via the hadronic shadowing described by Glauber. Since the dissociation cross section has a small theoretical error we adopt this process to normalize other cross sections measured in RHIC.

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Section: Instrumentationmentioning

confidence: 99%

Diffraction Dissociation — 50 Years later

White¹

2005

AIP Conference Proceedings

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“…In neutron rich ion species stored at RHIC (Au) and LHC (Pb) most of the information is carried by neutrons which are detected in the RHIC Zero Degree Calorimeters (ZDC's) [2] that were installed in each experiment. Protons are also measured in the PHENIX experiment using a large area hadron calorimeter recycled from AGS experiment E865.…”

Section: Heavy Ion Goalsmentioning

confidence: 99%

Inelastic Diffraction at Heavy Ion Colliders

White

2005

Nuclear Physics B - Proceedings Supplements

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The heavy ion physics approach to global event characterization has led us to instrument the forward region in the PHENIX experiment at RHIC. In heavy ion collisions this coverage yields a measurement of the "spectator" energy and its distribution about the beam direction. This energy flow is the basis of event-by-event determination of the centrality and reaction plane which are key to analyzing particle production in heavy ion collisions. These same tools have also enabled a unique set of measurements on inelastic diffraction with proton, deuteron and gold ion beams in the PHENIX experiment. We present first new results on this topic and discuss briefly the opportunity for diffractive physics with Heavy Ion beams at the LHC.Comment: RHIC overview talk presented at "Diffraction 2004" in Dorgali, Sardegna, Ital

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“…In the PHOBOS experiment [10] at the Relativistic Heavy-Ion Collider (RHIC), completely-freed neutrons can be measured using the Zero-Degree Calorimeters (ZDC) [11], which are specifically designed for this purpose. Charged fragments are not observed in these detectors as they are swept away from the ZDCs by the RHIC accelerator magnets.…”

Section: Introductionmentioning

confidence: 99%

Participant and spectator scaling of spectator fragments in Au + Au and Cu + Cu collisions atsNN=19.6and 22.4 GeV

Alver¹,

Back²,

Baker³

et al. 2016

Phys. Rev. C

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Spectator fragments resulting from relativistic heavy ion collisions, consisting of single protons and neutrons along with groups of stable nuclear fragments up to Nitrogen (Z = 7), are measured in PHOBOS. These fragments are observed in Au+Au ( √ s N N = 19.6 GeV) and Cu+Cu (22.4 GeV) collisions at high pseudorapidity (η). The dominant multiply-charged fragment is the tightly bound Helium (α), with Lithium, Beryllium, and Boron all clearly seen as a function of collision centrality and pseudorapidity. We observe that in Cu+Cu collisions, it becomes much more favorable for the α fragments to be released than Lithium. The yields of fragments approximately scale with the number of spectator nucleons, independent of the colliding ion. The shapes of the pseudorapidity distributions of fragments indicate that the average deflection of the fragments away from the beam direction increases for more central collisions. A detailed comparison of the shapes for α and Lithium fragments indicates that the centrality dependence of the deflections favors a scaling with the number of participants in the collision.

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Untitled

Cited by 3 publications

References 0 publications

Diffraction Dissociation — 50 Years later

Diffraction Dissociation — 50 Years later

Inelastic Diffraction at Heavy Ion Colliders

Participant and spectator scaling of spectator fragments in Au + Au and Cu + Cu collisions atsNN=19.6and 22.4 GeV

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