A 4 π dilepton spectrometer: PEPSI
A novel positron-electron pair spectroscopy instrument (PEPSI) was designed to measure transitions in the energy region 10–40 MeV. It consists of Nd 2Fe 14B permanent magnets forming a compact 4 π magnetic filter consisting of 12 positron and 20 electron mini-orange-like spectrometers. The response...
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Published in | Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 335; no. 3; pp. 479 - 486 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.11.1993
|
Online Access | Get full text |
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Summary: | A novel positron-electron pair spectroscopy instrument (PEPSI) was designed to measure transitions in the energy region 10–40 MeV. It consists of Nd
2Fe
14B permanent magnets forming a compact 4
π magnetic filter consisting of 12 positron and 20 electron mini-orange-like spectrometers. The response function of PEPSI has been measured with mono-energetic beams of electrons from 5 to 20 MeV. The PEPSI spectrometer was used for measuring the internal pair conversion coefficient (
α
π
) of the 15.1 MeV M1 transition from a
J
π
= 1
+ state to the ground state in
12C. Our experimental value of
α
π
= (3.3 ± 0.5) × 10
−3 is in good agreement with theoretical estimates. |
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ISSN: | 0168-9002 1872-9576 |
DOI: | 10.1016/0168-9002(93)91233-D |