A HIGH RESOLUTION PAIR SPECTROMETER FOR MEDIUM-ENERGY PHOTONS - INSPIRE

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A HIGH RESOLUTION PAIR SPECTROMETER FOR MEDIUM-ENERGY PHOTONS

1979

22 pages

Published in:

Nucl.Instrum.Meth. 160 (1979) 93-114

DOI:

10.1016/0029-554X(79)90170-8

reference search26 citations

Citations per year

Abstract: (Elsevier)

The construction, performance and associated on- and off-line analysis procedures of a pair spectrometer for medium energy photons (50–150 MeV) is described. In a large aperture window frame magnet electrons and positrons from photons converting in thin gold foils are bent by 180°. The trajectories are observed with large multiwire proportional chambers. The performance of the system was tested with stopped π − and a liquid hydrogen target. The resolution is 840 keV (fwhm) at 129.4 MeV; the overall acceptance which includes solid angle probability, conversion efficiency, e + e − pattern recognition efficiency and trigger detector efficiency, is 2.5 × 10 −5 (or 1.030 MeV and 4.5 × 10 −5 respectively). With special care, the position of a photon line in the vicinity of the H line can be determined to an accuracy of a few keV, while the known absolute energy of the 129.4 MeV H line has been determined to an accuracy of about 0.1 MeV.

PHOTON: PARTICLE IDENTIFICATION
BENDING MAGNET
MAGNETIC SPECTROMETER: EFFICIENCY
MAGNETIC SPECTROMETER: ENERGY RESOLUTION
ELECTRON POSITRON: PARTICLE IDENTIFICATION
PROPORTIONAL CHAMBER: READOUT
SCINTILLATION COUNTER
MEASUREMENT: TIME-OF-FLIGHT
FAST LOGIC: COINCIDENCE
COMPUTER: ON-LINE

References(23)

Figures(0)

[1]

Radiative Pion Capture in Nuclei

H.W. Baer
(
- Case Western Reserve U.
)
,
K.M. Crowe
(
- LBL, Berkeley
)
,
Peter Truoel
(
- Zurich U.
)

- Adv.Nucl.Phys. 9 (1977) 177-260,
- In *M Baranger, Advances In Nuclear Physics, Vol.9*, New York 1977, 177-260

[2]

Measurement of pi- p --> pi0 n Differential Cross-Sections Using a Nai(TL) Photon Spectrometer

W. Bayer
(
- Munich U. and
- CERN
)
,
H. Hilscher
(
- Munich U. and
- CERN
)
,
W. O'Connell
(
- Munich U. and
- CERN
)
,
H. Schmitt
(
- Munich U. and
- CERN
)
,
C. Zupancic
(
- Munich U. and
- CERN
)

et al.

- Nucl.Instrum.Meth. 134 (1976) 449
•
DOI:
- 10.1016/0029-554X(76)90089-6

[3]

Photon spectra from radiative absorption of pions in nuclei

- Phys.Rev.C 5 (1972) 1867-1883
•
DOI:
- 10.1103/PhysRevC.5.1867

[4]

Radiative pion capture in li-6

et al.

- Phys.Rev.C 8 (1973) 2029-2038
•
DOI:
- 10.1103/PhysRevC.8.2029

[5]

For details see

H. von Fellenberg

[6]

SIN - Technical Report, SIN-TM-14-10

R. Balsiger

[7]

Thesis

E. Winkelmann

[8]

Thesis

N. Morel

[9]

A circuit for processing signals from multiwire proportional chambers constructed in thick film hybrid form

J.C. Tarle
(
- CERN
)
,
H. Verweij
(
- CERN
)

- Nucl.Instrum.Meth. 102 (1972) 131-140
•
DOI:
- 10.1016/0029-554X(72)90532-0

[10]

A system for separating amplifiers from wire proportional chambers

D.F. Jones
(
- Los Alamos
)
,
E.R. Martin
(
- Los Alamos
)

- Nucl.Instrum.Meth. 98 (1972) 535-540
•
DOI:
- 10.1016/0029-554X(72)90239-X

[11]

Thesis

H. Kaspar

[12]

For details see: Diploma-Thesis (University of Zürich)

A. Frischknecht

[13]

For details see: Thesis (University of Lausanne)

B. Gabioud

[14]

For details see: Thesis (University of Lausanne)

A. Perrenoud

[15]

Function parametrisation, in Proc.CERN computing and data processing School, CERN Report 72-21

H. Wind

[16]

CERN NP-Report 72-8

H. Wind

[17]

J.C. Alder

[18]

A Remeasurement of the Panofsky Ratio

J. Spuller
(
- British Columbia U.
)
,
D. Berghofer
(
- British Columbia U.
)
,
M.D. Hasinoff
(
- British Columbia U.
)
,
R. Macdonald
(
- British Columbia U.
)
,
David F. Measday
(
- British Columbia U.
)

et al.

- Phys.Lett.B 67 (1977) 479-482
•
DOI:
- 10.1016/0370-2693(77)90449-X

[19]

Theory of Bremsstrahlung and Pair Production. 2. Integral Cross Section for Pair Production

- Phys.Rev. 93 (1954) 788-795
•
DOI:
- 10.1103/PhysRev.93.788

[20]

Nat.Acad.Sci.

M. Berger
,
S. Seltzer

[21]

W. Börsch-Supan

- J.Res.NBS B 65 (1961) 245

[22]

G. Molière

- Z.Naturforsch. 3 (1948) 78

[23]

Bremsstrahlung Cross-Section Formulas and Related Data

H.W. Koch
(
- NIST, Wash., D.C.
)
,
J.W. Motz
(
- NIST, Wash., D.C.
)

- Rev.Mod.Phys. 31 (1959) 920-955
•
DOI:
- 10.1103/RevModPhys.31.920