AN EXPERIMENTAL-STUDY OF ANTIPROTON - HE-4 ANNIHILATION AT REST

被引：15

作者：

ADAMO, A

AGNELLO, M

BALESTRA, F

BELLI, G

BENDISCIOLI, G

BERTIN, A

BOCCACCIO, P

BONAZZOLA, GC

BRESSANI, T

BRUSCHI, M

BUSSA, MP

BUSSO, L

CALVO, D

CAPPONI, M

CERELLO, P

CICALO, C

COSTA, S

DECASTRO, S

DISEP, F

DONZELLA, A

FAVA, L

FELICIELLO, A

FERRERO, L

FILIPPI, A

FILIPPINI, V

GALLI, D

GARFAGNINI, R

GASTALDI, U

GIANOTTI, P

GRASSO, A

GUARALDO, C

IAZZI, F

KHARZEEV, DE

LANARO, A

LODI RIZZINI, E

LOMBARDI, M

LUCHERINI, V

MAGGIORA, A

MARCELLO, S

MARCONI, U

MARGAGLIOTTI, GV

MARON, G

MASONI, A

MASSA, I

MINETTI, B

MONTAGNA, P

MORANDO, M

NICHITIU, F

PANZIERI, D

PAULI, P

机构：

[1] INFN, SEZ CAGLIARI, I-09100 CAGLIARI, ITALY

[2] INFN, SEZ TORINO, I-1025 TURIN, ITALY

[3] POLITECN TORINO, I-1025 TURIN, ITALY

[4] UNIV BRESCIA, DIPARTIMENTO ELECTR AUTOMAZ, I-251060 BRESCIA, ITALY

[5] UNIV PAVIA, DIPARTIMENTO FIS NUCL & TEOR, I-27100 PAVIA, ITALY

[6] INFN, SEZ PAVIA, I-27100 PAVIA, ITALY

[7] UNIV BOLOGNA, DIPARTIMENTO FIS, I-40100 BOLOGNA, ITALY

[8] INFN, SEZ PAVIA, I-27100 PAVIA, ITALY

[9] INFN, LAB NAZL LEGNARO, I-30020 LEGNANO, ITALY

[10] UNIV TURIN, IST FIS, I-10125 TURIN, ITALY

[11] INFN, LAB NAZL FRASCATI, I-00044 FRASCATI, ITALY

[12] UNIV TRIESTE, IST FIS, I-34127 TRIESTE, ITALY

[13] INFN, SEZ TRIESTE, I-34127 TRIESTE, ITALY

[14] UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY

[15] INFN, SEZ PADOVA, I-35100 PADUA, ITALY

[16] JOINT NUCL RES INST, MOSCOW 101000, RUSSIA

[17] UNIV FLORENCE, DIPARTIMENTO ENERGET, I-50121 FLORENCE, ITALY

[18] UNIV UDINE, IST FIS, I-33100 UDINE, ITALY

[19] INFN, SEZ TRIESTE, I-33100 UDINE, ITALY

来源：

NUCLEAR PHYSICS A | 1994年 / 569卷 / 04期

关键词：

NUCLEAR REACTIONS HE-4 (P-BAR; X)E AT REST; MEASURED 2-PI(+) 2-PI(-) INVARIANT MASS DISTRIBUTION; PI-PI(THETA); PI-P(THETA); AND PP(THETA); PI; P-MOMENTUM DISTRIBUTIONS; DEDUCED UPPER LIMIT FOR THE PROBABILITY OF REACTION ETA(OMEGA)PP-]PP; BRANCHING RATIO FOR REACTION P-BAR HE-4-]MPFAST+ 2N SPECTATOR; M-]2-PI(+)2-PI(-);

D O I：

10.1016/0375-9474(94)90384-0

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

This paper reports new experimental results on the annihilation of antiprotons stopped in a He-4 gas target. The measurement was carried out with the Obelix spectrometer installed at the LEAR machine of CERN. Main results can be-summarized as follows. (i) The invariant mass distribution of 2pi+2pi- produced at rest is similar to those from hydrogen and deuterium targets: the peak seen in recent experiments around 1150 MeV/c2 is absent. (ii) 2pi angular correlations are very close to those found for hydrogen. The nuclear structure does not modify remarkably the pion production and emission. (iii) pip and pp angular correlations are strongly peaked close to 180-degrees, in qualitative agreement with INC model predictions. (iv) The pp invariant mass distribution reveals events which may be due to eta(omega) absorption; the estimated upper limit for probability of eta and omega absorption is about 3 x 10(-3). (v) Events having features compatible with two-nucleon annihilations with production of heavy mesonic systems are detected both in the 2pi+2pi- and the 2pi-pi+ channels. The production rate of the 2pi+2pi-channel is of the order of 5 x 10(-3).

引用

页码：761 / 790

页数：30

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