Solar neutrinos: The Beginning at MPIK. W. Hampel
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1 Solar neutrinos: The Beginning at MPIK W. Hampel
2 : Geochemical Bromine-Krypton Experiment : Gallium Pilot experiment with 1.26 tons of Gallium : Transition phase from the pilot experiment to GALLEX
3 Geochemical Bromine Krypton Solar Neutrino Experiment Basic idea: Extract 81 Kr from about 10 tons of Bromine which has been produced over about 10 6 years in 10 tons of natural Bromine by solar 7 Be neutrinos log ft =? (4-6) threshold 490 kev Isotopic composition of Bromine: 79 Br 50.7% 81 Br 49.3%
4 Potassium salt deposits in Northern Germany Sylvite (KCl) Carnallite (KMgCl 3 *6 H 2 O) Kainite (KMg[Cl SO 4 ]*2.75 H 2 O) Langbeinite (K 2 Mg 2 (SO 4 ) 3 ) Kali- und Salz AG Mine at Bad Salzdetfurth (between Hannover and Kassel) Mining down to a depth of 900 m Daily output: ~ 5000 tons of potassium salt Bromine content 0,2% (corresponds to 10 tons of Br) Kassel Hannover Salzdetfurth Expected: about cc STP 81 Kr (for an assumed log ft value of 5) can in principle be measured by mass spectrometry)
5 Results (mainly from the PhD thesis K. Büchler 1980): Retention age for Krypton > 1 million years: ok We tried to measure the log ft value for the relevant transition: result >3.3 (expected 4-6) Muon-induced production at 900 m depth: about cc STP 81 Kr (same as solar-neutrino-produced 81 Kr) Mining not deep enough Dissolved stable Krypton in salt: 2x10-10 cc STP/g This leads to a ratio 81 Kr/ 82 Kr of not possible to be measured without isotopic separation Background by (α,p)(p,n) reactions through uranium and thorium: For a 10% bkg: 0.5 ppb U Measured 9 ppb in one case, mostly > 200 ppb much too high Kassel Hannover Salzdetfurth
6 Talk of T.Kirsten at the Informal Conference on Status and Future of Solar Neutrino Research (organized by Ray Davis and his collaborators in January 1978): Further consideration of the 81 Br- 81 Kr system At this time: it was clear that the Br-Kr experiment was not feasable with the potassium salt target of Salzdetfurth However: after the conference we were invited by R. Davis and his collaborators to discuss a possible participation in a Gallium solar neutrino experiment: this led to the Gallium Pilot experiment Collaboration
7 Visit of Ray Davis jr. at Heidelberg in 1978 Donald D. Clayton (Humboldt Research Awardee MPG) Oliver A. Schaeffer (External Scientific Member MPIK)
8 Thanks to an agreement between Raymond Davis and Till Kirsten: 1978/1979: Stay at the Chemistry Department, Brookhaven National Laboratory, Upton, New York, USA. Group of Raymond Davis Ge extraction from GaCl 3 solution Tritium-free GeCl 4 conversion to GeH 4 Counter construction and filling Raymond Davis jr. Physics Nobel Prize 2002 Data evaluation for the Chlorine experiment: Maximum Likelihood Method Monte Carlo Calculations Bruce T. Cleveland
9 March 1979 Meeting at BNL which led to the contract between BNL and MPIK to perform a pilot experiment with 1.26 tons of gallium
10 Pilot experiment with 1.26 tons of Gallium Collaboration Brookhaven National Laboratory, Upton, NY (Ga 2/3) Max-Planck-Institut für Kernphysik Heidelberg (Ga 1/3) Weizmann Institute Rehovot Institute for Advanced Studies Princeton University of Pennsylvania at Philadelphia
11 Four members of the pilot experiment collaboration Ray Davis jr. Israel Dostrovsky Keith Rowley John Bahcall (also GALLEX member) (also GALLEX member)
12 Pilot experiment installation in the basement of the Chemistry Department at Brookhaven National Laboratory 2.8 m 3 tank with Kynar and teflon lining 1.26 tons Gallium 4.65 tons of GaCl 3 solution
13 April 1980: Pilot tank is filled with 4.65 tons of GaCl 3 solution Very first Ge extraction from the pilot tank 99.6% of the germanium initially present in the GaCl 3 solution of the pilot tank (~200 mg) have been extracted in a 32-hour sweep
14 Low Level Proportional Counter Davis-type Similar to the counters used by Ray Davis in the Chlorine experiment Davis type Counter type used for counting GeH 4 samples from the pilot tank. Gerd Heusser has used this type of counter already a few years before the pilot experiment for the measurement of 37 Ar and 39 Ar in meteorite samples..
15 Run 7 of the pilot experiment Measurement of the 71 Ge production rate by cosmic rays in the pilot tank 110 ± Ge atoms /day (Shielding: a few meters of water equivalent) Here we used about 3 mg of Ge carrier this results in about 1 cm 3 of GeH 4 Counting gas is pure GeH 4 Non-linear energy scale
16 Outcome of the Pilot experiment: A full scale solar neutrino experiment with 30 tons of gallium is feasible!
17 After the end of the pilot experiment: Plans to perform a full scale experiment (share of gallium costs: ¾ BNL, ¼ MPIK) First step: perform a 51 Cr source experiment with 12.8 tons of gallium in the Asarco zinc mine in Tennessee (500m underground) Second step: full scale experiment with 50 tons of gallium in the Homestake mine BNL requested in several proposals to the Department of Energy and to the National Science Foundation to finance the US share of Gallium: they all failed BNL director: decided to stop working on the gallium experiment (January 1984) End of the pilot experiment collaboration
18 Reduction factor for 2ν vacuum maximal mixing as a function of m 2 for the chlorine and gallium solar neutrino detectors Vacuum neutrino oscillations: have in principle long been on the list of possible explanations for the low solar neutrino capture rate in the Cl experiment However: substantial reduction for the Cl signal needs very specific and rather low m 2 values (close to ev 2 )
19 The Mikheyev-Smirnov-Wolfenstein Effect 10th International Workshop on Weak Interactions (WIN 1985) June, 1985, Savonlinna, Finland Talk given by Alexei Smirnov (authors Stanislav Mikheyev and Alexei Smirnov) on a new effect concerning neutrino mixing in matter based on earlier work of Lincoln Wolfenstein (later called the Mikeyev-Smirnov-Wolfenstein effect) Bogdan Povh (former director of the MPIK) visited this conference. He recognized the importance of this work for the gallium experiment and reported this to us. This triggered extensive numerical calculations by the Saclay group and our group on the MSW effect, especially for the Gallium solar neutrino detector: J. Bouchez, M. Cribier, W. Hampel, J. Rich, M. Spiro and D. Vignaud: Matter effects for solar neutrino oscillations Z. Phys. C32, (1986). M. Cribier, W. Hampel, J. Rich and D. Vignaud: MSW Regeneration of Solar ν e in the Earth, Phys. Lett. B182, (1986).
20 Contour lines for possible gallium detector results as a function of the mixing angle Θ and the squared mass difference m 2 Final result: GALLEX/GNO: 69.3 ± 5.5 SNU WH 1986 Current Large mixing angle solution for 2ν mixing: { m 2 = 4.7 x 10-5 ev 2 sin 2 2Θ = 0.85
21 After the end of the Pilot Experiment Collaboration: Till Kirsten investigated the possibilities to perform the Gallium solar neutrino experiment in Europe. His efforts were successful in all aspects: The European GALLEX Collaboration was formed (1984) Funding for 30 tons of Gallium through the combined efforts of MPIK Heidelberg, Max Planck Society, Krupp Foundation and the German Federal Ministry of Research and Technology was assured (December 1985) The italian INFN assigned the required underground space in the newly constructed Laboratori Nazionali del Gran Sasso (1985)
22 Heidelberg Low Level Proportional Counter Development 1985: after the GALLEX collaboration was formed: tried to improve our low-level counters Intermediate step: HD-1 HD-1 Aluminum cathode evaporated onto the inside of the quartz body in order to minimize the dead volume. Stop cock close to the counting volume Final type: HD-2 (which was used in GALLEX) HD-2 First stage of the preamplifier close to the counting volume
23 1986: The Heidelberg GALLEX group with the counting shield still sitting in Heidelberg
24 First visit of the GALLEX Collaboration at the Laboratori Nazionali del Gran Sasso, April 1985 At this visit: (1) Hall B was already complete (2) excavation of hall A just had started (3) there was no hall C yet
25 Many thanks to Till Kirsten: Through his long-lasting efforts the GALLEX solar neutrino experiment became reality! this enabled many of us to take part in this fundamental and successful experiment of astrophysics!
26
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