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October 1954 – the new CERN Council

When the CERN Convention was signed in 1953, it was assumed that the long-awaited European laboratory would soon become a reality. But ratification formalities took longer than expected. Meanwhile work on the ground was forging ahead, so it was a relief for the interim governors when the new CERN Council finally took office some 15 months later.


An important item at the first Council meeting on 7-8 October 1954 was the transfer of all assets and liabilities of the interim organization. Council officers and senior CERN staff were also appointed, various procedural, financial and staff questions settled, and a provisional organizational structure adopted. This structure was approved at the second meeting in February 1955 (shown in photo) along with the headquarters agreement with Switzerland. CERN was finally starting to take shape! If you’re interested to know more, the minutes of the first meeting are available here.

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September 1954 – CERN exists!

A telegram from Jean Mussard informed Edoardo Amaldi (Secretary-General of the provisional CERN) that the CERN Convention had finally come into force on 29 September, when France and Germany deposited their instruments of ratification at UNESCO House in Paris.


Three more member states were yet to ratify – this took another five months – but the necessary conditions had now been met. The provisional Council ceased to exist and, after a few days during which Amaldi was the sole owner of all CERN’s assets, the new organization held its first meeting in Geneva on the 7-8 October 1954.

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August 1983 – His Holiness the Dalai Lama visits CERN

CERN is a centre for scientific research, but also a place for exchanges between science and other fields of human culture and understanding. The visit of His Holiness the Dalai Lama on 30 August 1983 provided just such an opportunity.


In the morning he and his delegation of monks toured some of CERN’s facilities, including UA1, where the recent discovery of the W and Z bosons had taken place. After joining the visitors for lunch, some of CERN’s physicists gave short presentations on various aspects of CERN’s work, and a discussion explored the different viewpoints of Buddhists and physicists on a range of topics of mutual interest.

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Dear colleagues, Please find a message from the Particle Data Group: We appeal for you to help us by completing an extremely short survey about the future of the Particle Data Book and Booklet. It should take only a minute. Because of funding limitations and the size of these products, it has been asked whether the printed book and booklet should be downsized or discontinued, starting in 2016. We are completely open about this matter and would value hearing your opinions. The entire contents of the book are online. We are planning to make an app with the contents of the book. The survey is on the Web at: (link is external). Thank you for taking a minute to do the survey. Your reward for filling out the survey will be a PDG top ten list. The Particle Data Group
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July 1953 – Signing the CERN Convention

After long months of negotiation - success! The work of the provisional Council responsible for planning the new international laboratory for nuclear physics reached a successful conclusion on 1 July 1953 with the signature of the CERN Convention.

The drafting committee and the administrative and financial working group had worked at UNESCO House throughout the week leading up the Council’s sixth meeting in Paris (29-30 June) to finalize the document, and signature took place the next day at a conference held at the Ministry of Foreign Affairs. Delegates of nine countries signed, with the remaining three expressing their intention to do so shortly.

The convention was gradually ratified by the 12 founding member states (Belgium, Denmark, France, the Federal Republic of Germany, Greece, Italy, the Netherlands, Norway, Sweden, Switzerland, the United Kingdom, and Yugoslavia) and the European Organization for Nuclear Research officially came into being on 29 September 1954. The text of the Convention is available here.

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June 1955 – Laying the foundation stone of CERN

“On this tenth day of June, one thousand nine hundred and fifty five, on ground generously given by the Republic and Canton of Geneva, was laid the foundation stone of the buildings of the headquarters and the laboratories of the European Organization for Nuclear Research, the first European institution devoted to co-operative research for the advancement of pure science”

The stone was laid by the organization’s first Director-General, Felix Bloch, and speeches referred to the challenge of setting up the new laboratory, the cooperation and goodwill that had made it possible and a vision for the future.  The headquarters agreement with the Swiss Federation was signed the following morning, and in the afternoon the grounds of CERN were thrown open to the public. Construction had started long before the foundation stone, of course, so there was already plenty for visitors to see, and staff were on hand to act as guides. Want to know more? The commemorative booklet for the Foundation Stone Ceremony and the Open Day flyer are available here

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May 1963 – The lighter side of neutrino experiments

A buzz of excitement marked the start of neutrino experiments at CERN in 1963. As many years of hard work were about to be put to the test, this spoof advertisement appeared on the concrete shielding near the heavy liquid bubble chamber.

CERN inventions such as the fast ejection system, proposed in 1959 by Berend Kuiper and Günther Plass, and the magnetic horn, which earned Simon van der Meer his share of the Nobel prize for physics in 1984, had enabled CERN to produce the most intense beam of neutrinos in the world. The first run in June was anxiously awaited, but everything ran smoothly. During seven weeks a total of 4000 events were observed in the spark chamber and 360 in the bubble chamber, comparing very favourably with the 56 spark chamber events found in the previous neutrino experiment in Brookhaven

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April 1964 – CERN Open Day!

If you were one of the estimated 70,000 visitors to CERN during the 2013 Open Days – or one of the 2,000+ volunteers busily organizing visits, games and all manner of weird and wonderful activities – you might not recognize this photo! Fifty years ago CERN’s Open Days were conducted on a much more modest scale.

Limited to families and guests of staff, CERN’s third Open Day on 25 April 1964 welcomed 1,100 visitors. Various CERN departments displayed their laboratories and equipment, and a kindergarten looked after the youngest visitors while their parents toured the site. A technical press day was also arranged on 19 May, with 36 visiting journalists. CERN’s Public Information Office reported good coverage of CERN’s activities during the year, despite “the general disinterest of the daily press in basic science”.

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March 1959 – preparing CERN’s HBC30 bubble chamber for testing

The 30cm liquid hydrogen bubble chamber (HBC30) - here seen being inserted into its vacuum tank in March 1959 - was the first bubble chamber to be used for physics experiments at CERN. After testing with nitrogen and hydrogen it was placed in the Synchro-Cyclotron, and its first five days of operation in November yielded 100,000 photographs. In March 1960 it was moved to the proton Synchrotron, and by the time it ceased operations in spring 1962 it had consumed 150 km of film.


Bubble chambers were one of the main experimental tools used in high-energy physics during the 1950s and 1960s. They were filled with superheated liquid, and if a charged high-energy particle passed through the liquid started to boil along its path, producing a trail of tiny bubbles that could be photographed. CERN’s first bubble chamber was a small (10cm) trial model, developed to test this exciting new technique. Larger models soon followed, including the giantess Gargamelle and the Big European Bubble Chamber (BEBC).

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Due to budget cuts, the publication of the Pocket Diary for Physicists will be discontinued. It will not be produced this year or in the future.


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