MEASUREMENT OF THE (P)OVER-BARP-]PI+PI- AND (P)OVER-BARP-]K+K- ANNIHILATION FREQUENCIES IN A 5 MB HYDROGEN GAS-TARGET

被引：426

作者：

ABLEEV, VG

ADAMO, A

AGNELLO, M

ANDRIGHETTO, A

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

CORRADINI, M

COSTA, S

DANTONE, I

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

LAI, A

LANARO, A

RIZZINI, EL

LOMBARDI, M

LUCHERINI, V

MAGGIORA, A

MANEVA, G

MARCELLO, S

MARCONI, U

MARGAGLIOTTI, G

MARON, G

MASONI, A

MASSA, I

MINETTI, B

机构：

[1] UNIV CAGLIARI, DIPARTIMENTO SCI FIS, I-09100 CAGLIARI, ITALY

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

[3] POLITECN TORINO, I-10125 TURIN, ITALY

[4] INF, SEZ TORINO, I-10125 TURIN, ITALY

[5] UNIV BRESCIA, DIPARTIMENTO AUTOM IND, I-25060 BARI, ITALY

[6] INFN, SEZ TORINO, I-25060 BRESCIA, ITALY

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

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

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

[10] INFN, SEZ BOLOGNA, I-40100 BOLGONA, ITALY

[11] INFN, LAB NAZL LEGNARO, I-35020 LEGNANO, ITALY

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

[13] CERRO TOLOLO INTERAMER OBSERV, PPE, LA SERENA, CHILE

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

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

[16] INFN, SEZ PADOVA, I-34127 TRIESTE, ITALY

[17] UNIV PADUA, DIPARTIMENTO FIS, I-35100 PADUA, ITALY

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

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

[20] UNIV UDINE, INST FIS, I-33100 UDINE, ITALY

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

来源：

PHYSICS LETTERS B | 1994年 / 329卷 / 2-3期

关键词：

D O I：

10.1016/0370-2693(94)90794-3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the first measurement of the K+K-, pi+pi- frequencies for pBAR annihilations at rest in a gaseous H-2 target at low pressure (5 mbar). We have obtained:f(pipi)=(4.26+/-0.11) X 10(-3), f(KK)=(0.46+/-0.03)X10(-3). The ratio R=f(KK)/f(pipi) has also been measured at a pressure of 2 mbar. Comparison with previous measurements shows that f(KK) decreases monotonically with the target density but its value at 5 mbar is still higher than the value with L X-rays in coincidence.

引用

页码：407 / 412

页数：6

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