Dielectron cross section measurements in nucleus-nucleus reactions at 1.0A GeV

被引：175

作者：

Porter, RJ

Beedoe, S

Bossingham, R

Bougteb, M

Christie, WB

Carroll, J

Gong, WG

Hallman, T

Heilbronn, L

Huang, HZ

Igo, G

Kirk, P

Krebs, G

LetessierSelvon, A

Madansky, L

Manso, F

Matis, HS

Miller, J

Naudet, C

Prunet, M

Roche, G

Schroeder, LS

Seidl, P

Wang, ZF

Welsh, RC

Wilson, WK

Yegneswaran, A

机构：

[1] UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90095

[2] UNIV CLERMONT FERRAND,IN2P3,F-63177 AUBIERE,FRANCE

[3] JOHNS HOPKINS UNIV,BALTIMORE,MD 21218

[4] LOUISIANA STATE UNIV,BATON ROUGE,LA 70803

[5] WAYNE STATE UNIV,DETROIT,MI 48201

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.79.1229

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present measured dielectron production cross sections for Ca + Ca, C + C, He + Ca, and d + Ca reactions at 1.0 AGeV. Statistical uncertainties and systematic effects are smaller than in previous dilepton spectrometer (DLS) nucleus-nucleus data. For pair mass M less than or equal to 0.35 GeV/c(2) we obtain (1) the Ca + Ca cross section is larger than the previous DLS measurement and current model results, (2) the mass spectra suggest large contributions from pi(0) and eta Dalitz decays, and (3) d sigma/dM proportional to A(p)A(T). For M > 0.5 GeV/c(2) the Ca + Ca to C + C cross section ratio is significantly larger than the ratio of A(p)A(T) values.

引用

页码：1229 / 1232

页数：4

共 29 条

[1] EFFECTS OF PAIR CORRELATIONS IN STATISTICAL GAMMA-DECAY SPECTRA [J].

DOSSING, T ;

KHOO, TL ;

LAURITSEN, T ;

AHMAD, I ;

BLUMENTHAL, D ;

CARPENTER, MP ;

CROWELL, B ;

GASSMANN, D ;

HENRY, RG ;

JANSSENS, RVF ;

NISIUS, D .

PHYSICAL REVIEW LETTERS, 1995, 75 (07) :1276-1279

[2] MEASUREMENT OF DIELECTRON PRODUCTION IN NIOBIUM-NIOBIUM COLLISIONS AT 1.05 GEV/NUCLEON [J].

BEEDOE, S ;

CARROLL, J ;

FORCE, P ;

GORDON, J ;

HALLMAN, T ;

IGO, G ;

KIRK, PN ;

KREBS, G ;

LETESSIERSELVON, A ;

MADANSKY, L ;

MATIS, HS ;

MILLER, D ;

NAUDET, C ;

ROCHE, G ;

SCHROEDER, LS ;

SEIDL, P ;

WANG, ZF ;

WELSH, R ;

YEGNESWARAN, A .

PHYSICAL REVIEW C, 1993, 47 (06) :2840-2845

[3] TRANSVERSE-MOMENTUM DISTRIBUTIONS OF ETA-MESONS IN NEAR-THRESHOLD RELATIVISTIC HEAVY-ION REACTIONS [J].

BERG, FD ;

PFEIFFER, M ;

SCHWALB, O ;

FRANKE, M ;

KUHN, W ;

LOHNER, H ;

METAG, V ;

NOTHEISEN, M ;

NOVOTNY, R ;

RASCHKE, AE ;

RITMAN, J ;

ROBIGLANDAU, M ;

SIMON, RS ;

SUMBERA, M ;

VENEMA, L ;

WILSCHUT, H .

PHYSICAL REVIEW LETTERS, 1994, 72 (07) :977-980

[4]

BOUGTEB M, 1994, THESIS U BLAISE PASC

[5] Dilepton anisotropy from p+Be and Ca+Ca collisions at BEVALAC energies [J].

Bratkovskaya, EL ;

Cassing, W ;

Mosel, U .

PHYSICS LETTERS B, 1996, 376 (1-3) :12-18

[6] PION AND PROTON TEMPERATURES IN RELATIVISTIC HEAVY-ION REACTIONS [J].

BROCKMANN, R ;

HARRIS, JW ;

SANDOVAL, A ;

STOCK, R ;

STROBELE, H ;

ODYNIEC, G ;

PUGH, HG ;

SCHROEDER, LS ;

RENFORDT, RE ;

SCHALL, D ;

BANGERT, D ;

RAUCH, W ;

WOLF, KL .

PHYSICAL REVIEW LETTERS, 1984, 53 (21) :2012-2015

[7] THE RHO-MESON IN DENSE MATTER AND ITS INFLUENCE ON DILEPTON PRODUCTION-RATES [J].

CHANFRAY, G ;

SCHUCK, P .

NUCLEAR PHYSICS A, 1993, 555 (01) :329-353

[8] K+ emission in symmetric heavy ion reactions at subthreshold energies [J].

Elmer, R ;

Berg, M ;

Carlen, L ;

Jakobsson, B ;

Noren, B ;

Oskarsson, A ;

Ericsson, G ;

Julien, J ;

Thorsteinsen, TF ;

Guttormsen, M ;

Lovhoiden, G ;

Bellini, V ;

Grosse, E ;

Muntz, C ;

Senger, P ;

Westerberg, L .

PHYSICAL REVIEW LETTERS, 1996, 77 (24) :4884-4886

[9] DILEPTON RADIATION FROM HIGH-TEMPERATURE NUCLEAR-MATTER [J].

GALE, C ;

KAPUSTA, J .

PHYSICAL REVIEW C, 1987, 35 (06) :2107-2116

[10]

GUDIMA KK, 1992, SOV J NUCL PHYS+, V55, P1715

← 1 2 3 →