MEASUREMENT OF THE PBARP ANNIHILATION CROSS-SECTIONS AT VERY LOW ENERGIES

被引：21

作者：

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

CORRADINI, M

COSTA, S

DECASTRO, S

DISEP, D

FALOMKIN, IV

FAVA, L

FELICIELLO, A

FERRERO, L

FILIPPINI, V

GARFAGNINI, R

GASTALDI, U

GIANOTTI, P

GRASSO, A

GUARALDO, C

IAZZI, F

LANARO, A

RIZZINI, EL

LOMBARDI, M

MACCIOTTA, MP

MAGGIORA, A

MARCELLO, S

MARCONI, U

MARGAGLIOTTI, GV

MARON, G

MASALA, M

MASONI, A

MASSA, I

MINETTI, B

MORANDO, M

MORGANTI, M

PANZIERI, D

PAULI, G

PICCININI, M

PIRAGINO, R

POLI, M

PONTECORVO, GB

PUDDU, G

机构：

[1] IST NAZL FIS NUCL, SEZ TORINO, TURIN, ITALY

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

[3] IST NAZL FIS NUCL, SEZ CAGLIARI, I-09100 CAGLIARI, ITALY

[4] UNIV BRESCIA, DIPARTIMENTO AUTOMAZ IND, BRESCIA, ITALY

[5] IST NAZL FIS NUCL, SEZ TORINO, I-25060 BRESCIA, ITALY

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

[7] IST NAZL FIS NUCL, I-27100 PAVIA, ITALY

[8] IST NAZL FIS NUCL, BOLOGNA, ITALY

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

[10] INST NAZL FIS NUCL, LAB NAZL LEGNARO, I-35100 PADUA, ITALY

[11] UNIV TURIN, INST FIS, I-10125 TURIN, ITALY

[12] IST NAZL FIS NUCL, TURIN, ITALY

[13] CERN, EP, CH-1211 GENEVA 23, SWITZERLAND

[14] JOINT INST NUCL RES, DUBNA 101000, USSR

[15] IST NAZL FIS NUCL, LAB NATL FRASCATI, I-00044 FRASCATI, ITALY

[16] UNIV TRIESTE, INST FIS, I-34127 TRIESTE, ITALY

[17] IST NAZL FIS NUCL, TRIESTE, ITALY

[18] UNIV PADUA, DIPARTMENTO FIS, I-35100 PADUA, ITALY

[19] IST NAZL FIS NUCL, PADUA, ITALY

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

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

[22] IST NAZL FIS NUCL, SEZ TRIESTE, I-33100 UDINE, ITALY

来源：

PHYSICS LETTERS B | 1991年 / 256卷 / 3-4期

关键词：

D O I：

10.1016/0370-2693(91)91774-P

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The pBARp annihilation cross-sections at 66.4-68.9-71.4 MeV/c have been measured using the presently instrumented part of the OBELIX spectrometer. The results have been obtained at pBAR energies (almost-equal-to 2.5 MeV) by one order of magnitude smaller than in any existing experiment concerning the in-flight antiproton-proton annihilation. The average value obtained over the total interval 65.1-72.5 MeV/c, beta-sigma-an(T) = 33.2 +/- 1.7 (stat.) +/- 1.8 (syst.) mb, in agreement with a specific calculation, would favour for the spin-averaged S-wave scattering length the value (-0.7 + i0.8) fm. The branching ratios for the annihilations in two, four and six charged mesons turn out to be quite similar to those for annihilation at rest in liquid hydrogen.

引用

页码：349 / 353

页数：5

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