AN EXPERIMENTAL-STUDY OF ANTIPROTON - HE-4 ANNIHILATION AT REST RID A-1606-2012 RID C-9883-2009

A ADAMO; M AGNELLO; F BALESTRA; G BELLI; G BENDISCIOLI; A BERTIN; P BOCCACCIO; GC BONAZZOLA; T BRESSANI; M BRUSCHI; MP BUSSA; L BUSSO; D CALVO; M CAPPONI; P CERELLO; C CICALO; S COSTA; S DECASTRO; F DISEP; A DONZELLA; L FAVA; A FELICIELLO; L FERRERO; A FILIPPI; V FILIPPINI; D GALLI; R GARFAGNINI; U GASTALDI; A LANARO; EL RIZZINI; M LOMBARDI; V LUCHERINI; A MAGGIORA; S MARCELLO; U MARCONI; GV MARGAGLIOTTI; G MARON; A MASONI; I MASSA; B MINETTI; P MONTAGNA; M MORANDO; F NICHITIU; Daniele PANZIERI; P PAULI; M PICCININI; G PIRAGINO; M POLI; G PUDDU; RA RICCI; E ROSSETTO; A ROTONDI; AM ROZHDENSTVENSKY; A SAINO; P SALVINI; L SANTI; MG SAPOZHNIKOV; NS CESARI; S SERCI; R SPIGHI; PP TEMNIKOV; S TESSARO; F TOSELLO; VI TRETYAK; GL USAI; L VANNUCCI; S VECCHI; G VEDOVATO; L VENTURELLI; M VILLA; A VITALE; A ZENONI; A ZOCCOLI; G. ZOSI

doi:10.1016/0375-9474(94)90384-0

AN EXPERIMENTAL-STUDY OF ANTIPROTON - HE-4 ANNIHILATION AT REST RID A-1606-2012 RID C-9883-2009

A ADAMO, M AGNELLO, F BALESTRA, G BELLI, G BENDISCIOLI, A BERTIN, P BOCCACCIO, GC BONAZZOLA, T BRESSANI, M BRUSCHI, MP BUSSA, L BUSSO, D CALVO, M CAPPONI, P CERELLO, C CICALO, S COSTA, S DECASTRO, F DISEP, A DONZELLAL FAVA, A FELICIELLO, L FERRERO, A FILIPPI, V FILIPPINI, D GALLI, R GARFAGNINI, U GASTALDI, A LANARO, EL RIZZINI, M LOMBARDI, V LUCHERINI, A MAGGIORA, S MARCELLO, U MARCONI, GV MARGAGLIOTTI, G MARON, A MASONI, I MASSA, B MINETTI, P MONTAGNA, M MORANDO, F NICHITIU, Daniele PANZIERI, P PAULI, M PICCININI, G PIRAGINO, M POLI, G PUDDU, RA RICCI, E ROSSETTO, A ROTONDI, AM ROZHDENSTVENSKY, A SAINO, P SALVINI, L SANTI, MG SAPOZHNIKOV, NS CESARI, S SERCI, R SPIGHI, PP TEMNIKOV, S TESSARO, F TOSELLO, VI TRETYAK, GL USAI, L VANNUCCI, S VECCHI, G VEDOVATO, L VENTURELLI, M VILLA, A VITALE, A ZENONI, A ZOCCOLI, G. ZOSI

Dipartimento di Scienze e Innovazione Tecnologica

Risultato della ricerca: Contributo su rivista › Articolo in rivista

Abstract

This paper reports new experimental results on the annihilation of antiprotons stopped in a⁴He 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 2π⁺2π^- 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) 2π angular correlations are very close to those found for hydrogen. The nuclear structure does not modify remarkably the pion production and emission, (iii) πp and pp angular correlations are strongly peaked close to 180°, in qualitative agreement with INC model predictions, (iv) The pp invariant mass distribution reveals events which may be due to η(ω) absorption; the estimated upper limit for probability of π and ω absorption is about 3 × 10^-3. (v) Events having features compatible with two-nucleon annihilations with production of heavy mesonic systems are detected both in the 2π⁺ 2π^- and the 2π^-π⁺ channels. The production rate of the 2π⁺ 2π^- channel is of the order of 5 × 10^-3.

Lingua originale	Inglese
pagine (da-a)	761-790
Numero di pagine	30
Rivista	NUCLEAR PHYSICS. A
Volume	569
Numero di pubblicazione	4
DOI	https://doi.org/10.1016/0375-9474(94)90384-0
Stato di pubblicazione	Pubblicato - 1 gen 1994

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10.1016/0375-9474(94)90384-0

http://hdl.handle.net/11579/5689

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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., ... ZOSI, G. (1994). AN EXPERIMENTAL-STUDY OF ANTIPROTON - HE-4 ANNIHILATION AT REST RID A-1606-2012 RID C-9883-2009. NUCLEAR PHYSICS. A, 569(4), 761-790. https://doi.org/10.1016/0375-9474(94)90384-0

@article{ffee6faf1afb4321a2334590c5c6e354,

title = "AN EXPERIMENTAL-STUDY OF ANTIPROTON - HE-4 ANNIHILATION AT REST RID A-1606-2012 RID C-9883-2009",

abstract = "This paper reports new experimental results on the annihilation of antiprotons stopped in a4He 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 2π+2π- 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) 2π angular correlations are very close to those found for hydrogen. The nuclear structure does not modify remarkably the pion production and emission, (iii) πp and pp angular correlations are strongly peaked close to 180°, in qualitative agreement with INC model predictions, (iv) The pp invariant mass distribution reveals events which may be due to η(ω) absorption; the estimated upper limit for probability of π and ω absorption is about 3 × 10-3. (v) Events having features compatible with two-nucleon annihilations with production of heavy mesonic systems are detected both in the 2π+ 2π- and the 2π-π+ channels. The production rate of the 2π+ 2π- channel is of the order of 5 × 10-3.",

author = "A ADAMO and M AGNELLO and F BALESTRA and G BELLI and G BENDISCIOLI and A BERTIN and P BOCCACCIO and GC BONAZZOLA and T BRESSANI and M BRUSCHI and MP BUSSA and L BUSSO and D CALVO and M CAPPONI and P CERELLO and C CICALO and S COSTA and S DECASTRO and F DISEP and A DONZELLA and L FAVA and A FELICIELLO and L FERRERO and A FILIPPI and V FILIPPINI and D GALLI and R GARFAGNINI and U GASTALDI and A LANARO and EL RIZZINI and M LOMBARDI and V LUCHERINI and A MAGGIORA and S MARCELLO and U MARCONI and GV MARGAGLIOTTI and G MARON and A MASONI and I MASSA and B MINETTI and P MONTAGNA and M MORANDO and F NICHITIU and Daniele PANZIERI and P PAULI and M PICCININI and G PIRAGINO and M POLI and G PUDDU and RA RICCI and E ROSSETTO and A ROTONDI and AM ROZHDENSTVENSKY and A SAINO and P SALVINI and L SANTI and MG SAPOZHNIKOV and NS CESARI and S SERCI and R SPIGHI and PP TEMNIKOV and S TESSARO and F TOSELLO and VI TRETYAK and GL USAI and L VANNUCCI and S VECCHI and G VEDOVATO and L VENTURELLI and M VILLA and A VITALE and A ZENONI and A ZOCCOLI and G. ZOSI",

year = "1994",

month = jan,

day = "1",

doi = "10.1016/0375-9474(94)90384-0",

language = "English",

volume = "569",

pages = "761--790",

journal = "NUCLEAR PHYSICS. A",

issn = "0375-9474",

number = "4",

}

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, LANARO, A, RIZZINI, EL, 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, PICCININI, M, PIRAGINO, G, POLI, M, PUDDU, G, RICCI, RA, ROSSETTO, E, ROTONDI, A, ROZHDENSTVENSKY, AM, SAINO, A, SALVINI, P, SANTI, L, SAPOZHNIKOV, MG, CESARI, NS, SERCI, S, SPIGHI, R, TEMNIKOV, PP, TESSARO, S, TOSELLO, F, TRETYAK, VI, USAI, GL, VANNUCCI, L, VECCHI, S, VEDOVATO, G, VENTURELLI, L, VILLA, M, VITALE, A, ZENONI, A, ZOCCOLI, A & ZOSI, G 1994, 'AN EXPERIMENTAL-STUDY OF ANTIPROTON - HE-4 ANNIHILATION AT REST RID A-1606-2012 RID C-9883-2009', NUCLEAR PHYSICS. A, vol. 569, n. 4, pagg. 761-790. https://doi.org/10.1016/0375-9474(94)90384-0

TY - JOUR

T1 - AN EXPERIMENTAL-STUDY OF ANTIPROTON - HE-4 ANNIHILATION AT REST RID A-1606-2012 RID C-9883-2009

AU - ADAMO, A

AU - AGNELLO, M

AU - BALESTRA, F

AU - BELLI, G

AU - BENDISCIOLI, G

AU - BERTIN, A

AU - BOCCACCIO, P

AU - BONAZZOLA, GC

AU - BRESSANI, T

AU - BRUSCHI, M

AU - BUSSA, MP

AU - BUSSO, L

AU - CALVO, D

AU - CAPPONI, M

AU - CERELLO, P

AU - CICALO, C

AU - COSTA, S

AU - DECASTRO, S

AU - DISEP, F

AU - DONZELLA, A

AU - FAVA, L

AU - FELICIELLO, A

AU - FERRERO, L

AU - FILIPPI, A

AU - FILIPPINI, V

AU - GALLI, D

AU - GARFAGNINI, R

AU - GASTALDI, U

AU - LANARO, A

AU - RIZZINI, EL

AU - LOMBARDI, M

AU - LUCHERINI, V

AU - MAGGIORA, A

AU - MARCELLO, S

AU - MARCONI, U

AU - MARGAGLIOTTI, GV

AU - MARON, G

AU - MASONI, A

AU - MASSA, I

AU - MINETTI, B

AU - MONTAGNA, P

AU - MORANDO, M

AU - NICHITIU, F

AU - PANZIERI, Daniele

AU - PAULI, P

AU - PICCININI, M

AU - PIRAGINO, G

AU - POLI, M

AU - PUDDU, G

AU - RICCI, RA

AU - ROSSETTO, E

AU - ROTONDI, A

AU - ROZHDENSTVENSKY, AM

AU - SAINO, A

AU - SALVINI, P

AU - SANTI, L

AU - SAPOZHNIKOV, MG

AU - CESARI, NS

AU - SERCI, S

AU - SPIGHI, R

AU - TEMNIKOV, PP

AU - TESSARO, S

AU - TOSELLO, F

AU - TRETYAK, VI

AU - USAI, GL

AU - VANNUCCI, L

AU - VECCHI, S

AU - VEDOVATO, G

AU - VENTURELLI, L

AU - VILLA, M

AU - VITALE, A

AU - ZENONI, A

AU - ZOCCOLI, A

AU - ZOSI, G.

PY - 1994/1/1

Y1 - 1994/1/1

N2 - This paper reports new experimental results on the annihilation of antiprotons stopped in a4He 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 2π+2π- 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) 2π angular correlations are very close to those found for hydrogen. The nuclear structure does not modify remarkably the pion production and emission, (iii) πp and pp angular correlations are strongly peaked close to 180°, in qualitative agreement with INC model predictions, (iv) The pp invariant mass distribution reveals events which may be due to η(ω) absorption; the estimated upper limit for probability of π and ω absorption is about 3 × 10-3. (v) Events having features compatible with two-nucleon annihilations with production of heavy mesonic systems are detected both in the 2π+ 2π- and the 2π-π+ channels. The production rate of the 2π+ 2π- channel is of the order of 5 × 10-3.

AB - This paper reports new experimental results on the annihilation of antiprotons stopped in a4He 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 2π+2π- 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) 2π angular correlations are very close to those found for hydrogen. The nuclear structure does not modify remarkably the pion production and emission, (iii) πp and pp angular correlations are strongly peaked close to 180°, in qualitative agreement with INC model predictions, (iv) The pp invariant mass distribution reveals events which may be due to η(ω) absorption; the estimated upper limit for probability of π and ω absorption is about 3 × 10-3. (v) Events having features compatible with two-nucleon annihilations with production of heavy mesonic systems are detected both in the 2π+ 2π- and the 2π-π+ channels. The production rate of the 2π+ 2π- channel is of the order of 5 × 10-3.

UR - https://iris.uniupo.it/handle/11579/5689

U2 - 10.1016/0375-9474(94)90384-0

DO - 10.1016/0375-9474(94)90384-0

M3 - Article

SN - 0375-9474

VL - 569

SP - 761

EP - 790

JO - NUCLEAR PHYSICS. A

JF - NUCLEAR PHYSICS. A

IS - 4

ER -

AN EXPERIMENTAL-STUDY OF ANTIPROTON - HE-4 ANNIHILATION AT REST RID A-1606-2012 RID C-9883-2009

Abstract

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