A New measurement of the Pontecorvo reaction anti-p + d ---> pi- + p with the OBELIX spectrometer at LEAR

The OBELIX collaboration Ableev, V.G. ; Adamo, A. ; Agnello, M. ; et al.
Nucl.Phys. A562 (1993) 617-643, 1993.
Inspire Record 364197 DOI 10.17182/hepdata.3849

Antinucleon-nucleus annihilations into two-body final states containing only one or no meson are unusual annihilations (Pontecorvo reactions), practically unexplored experimentally, with the exception of the channel p d → π − p , for which only two low-statistics measurements exist. Their physical interest lies in the possibility of exploring small-distance nuclear dynamics, in which an important role can be played by non-nucleonic degrees of freedom. A new measurement of the p d → π − p reaction rate at rest, performed with the OBELIX spectrometer at LEAR, with the best statistics up to now and a careful evaluation of systematic effects is reported, together with a critical analysis of the existing theoretical models. The measured branching ratio, which confirms the previous results, can represent a reference point for the studies in the field.

1 data table

No description provided.


Study of anti-n p --> phi pi+ and anti-n p --> omega pi+ annihilation reactions in flight

The OBELIX collaboration Filippi, A. ; Agnello, M. ; Balestra, F. ; et al.
Nucl.Phys. A655 (1999) 453-494, 1999.
Inspire Record 512679 DOI 10.17182/hepdata.36158
2 data tables

No description provided.

No description provided.


Antineutron proton total cross-section from 50-MeV/c to 400-MeV/c

The OBELIX collaboration Iazzi, F. ; Feliciello, A. ; Agnello, M. ; et al.
Phys.Lett. B475 (2000) 378-385, 2000.
Inspire Record 527242 DOI 10.17182/hepdata.28048
1 data table

Measured values of the total cross section.


Study of anti-neutron proton annihilation in two mesons in the momentum range between 50 to 400 MeV/c with OBELIX

The OBELIX collaboration Bertin, A. ; Bruschi, M. ; Capponi, M. ; et al.
Phys.Lett. B410 (1997) 344-352, 1997.
Inspire Record 459313 DOI 10.17182/hepdata.28243
1 data table

No description provided.


Study of Phi and f2'(1525) meson production in anti-p p annihilation at rest

The OBELIX collaboration Alberico, A. ; Bertin, A. ; Bruschi, M. ; et al.
Phys.Lett. B438 (1998) 430-440, 1998.
Inspire Record 481232 DOI 10.17182/hepdata.28160
4 data tables

Three densities (LH2, NTP, and LP) of the hydrogen target.

S- and P-wave in the initial PBAR P system.

S- and P-wave in the initial PBAR P system.

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anti-p p annihilation cross-section at very low-energy

The OBELIX collaboration Bertin, A. ; Bruschi, M. ; Capponi, M. ; et al.
Phys.Lett. B369 (1996) 77-85, 1996.
Inspire Record 428399 DOI 10.17182/hepdata.28410
1 data table

No description provided.


New data on OZI rule violation in anti-p p annihilation at rest

The OBELIX collaboration Bertin, A. ; Bruschi, M. ; De Castro, S. ; et al.
Phys.Lett. B388 (1996) 450-456, 1996.
Inspire Record 420512 DOI 10.17182/hepdata.41681
1 data table

(C=CORRECTED) the ratio with phase space correctio. The annihilation in liquid hydrogen (C=LIQUID) and in hydrogen at 3 atm (C=P).


Protonium annihilation into K(S) K(L) at three different target densities

The OBELIX collaboration Bertin, A. ; Bruschi, M. ; Capponi, M. ; et al.
Phys.Lett. B386 (1996) 486-494, 1996.
Inspire Record 431933 DOI 10.17182/hepdata.28347
1 data table

Three different target densities: liquid hydrogen (LH), gaseous hydrogen atstandard temperature and pressure conditions (NTP), and gaseous hydrogen at 5 m bar pressure (LP). The annihilation proceeds only from 3S1 initial state.


Annihilation cross-sections of anti-neutrons on C, Al, Cu, Sn and Pb at low momenta (180-MeV/c - 280-MeV/c) with the OBELIX spectrometer

The OBELIX collaboration Ableev, V.G. ; Adamo, A. ; Agnello, M. ; et al.
Nuovo Cim. A107 (1994) 943-953, 1994.
Inspire Record 384438 DOI 10.17182/hepdata.37841
3 data tables

No description provided.

No description provided.

No description provided.


Measurements of the anti-p d annihilation at rest

The OBELIX collaboration Ableev, V.G. ; Agnello, M. ; Balestra, F. ; et al.
Nucl.Phys. A585 (1995) 577-617, 1995.
Inspire Record 401145 DOI 10.17182/hepdata.36534
4 data tables

No description provided.

No description provided.

No description provided.

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Phi and omega meson production in anti-n p annihilation and the OZI rule

The OBELIX collaboration Ableev, V.G. ; Agnello, M. ; Balestra, F. ; et al.
Phys.Lett. B334 (1994) 237-243, 1994.
Inspire Record 383126 DOI 10.17182/hepdata.28740
1 data table

Assumes branching ratios of (49.1 +- 0.8)% for phi --> K+ K- and (88.8 +- 0.6)% for omega --> pi+ pi- pi0.