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Measurement of the breakup channels in nuclear muon capture by3He and4He

Authors :: Maev, E.
Ackerbauer, P.
Balin, D.
Baturin, V.
Beer, G.
Breunlich, W.
Case, T.
Crowe, K.
Daniel, H.
Deutsch, J.
von Egidy, T.
Govaerts, J.
Grigoriev, Yu.
Hartmann, F.
Kammel, P.
Lauss, B.
Marton, J.
Mühlbauer, M.
Petitjean, C.
Petitjean, Th.
Petrov, G.
Prieels, R.
Prymas, W.
Schott, W.
Semenchuk, G.
Smirenin, Yu.
Vorobyov, A.
Voropaev, N.
Wojciechowski, P.
Source :: Hyperfine Interactions; December 1996, Vol. 101 Issue: 1 p423-427, 5p
Publication Year :: 1996
Abstract: Abstract: The rates of the breakup reactions lambda<subscript>B</subscript>(<superscript>3</superscript>He) and lambda<subscript>B</subscript>(<superscript>4</superscript>He) in nuclear muon capture by<superscript>3</superscript>He and<superscript>4</superscript>He have been measured. The measurements were performed on the muon beam of PSI with a multi-anode high-pressure ionization chamber filled with isotopically pure<superscript>3</superscript>He or<superscript>4</superscript>He at 120 bar. The chamber was used as a target and detector for both the incoming muons and for the charged reaction products (tritons, deuterons and protons) of the breakup reactions Lambda<subscript>B</subscript>(<superscript>3</superscript>He) and Lambda<subscript>B</subscript>(<superscript>4</superscript>He). Our statistics, about 5 × 10<superscript>5</superscript> of breakup events, provides a possibility to improve the precision of evaluated rates. The preliminary results: lambda<subscript>B</subscript>(<superscript>3</superscript>He)=720 ± 70 s<superscript>–1</superscript>, lambda<subscript>B</subscript>(<superscript>4</superscript>He)=415 ± 40 s<superscript>–1</superscript> are compared to theoretical predictions and to previous experiments.