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NUSTAR Newsletter 1 / 2018

Aug 3, 2018 Introduction This newsletter is a summary of recent events and information regarding the FAIR-NUSTAR project and activities of the various NUSTAR committees.

Note that any information on highlights or upcoming meetings can be found on the NUSTAR@FAIR web page (see http://nustar.fair-center.eu). You can send your material to NUSTAR@fair-center.eu. Suggestions are always welcome. Upcoming meetings (selection)

• September 17-18, 2018: FAIR Research Division Retreat, Jena, Germany • September 24-28, 2018: NUSTAR Week 2018 in Milan, Italy • October 9-10, 2018: 10th ECE meeting • November 8-9, 2018: FAIR/GSI Joint Scientific Council meeting • November 26-27, 2018: 8th FAIR-RRB meeting • December 5-6, 2018: 25th FAIR Council meeting

News from FAIR FAIR construction in progress The excavation of the SIS100 tunnel area is progressing as planned. This is very nicely documented in several drone videos posted on YouTube (February 2018, April 2018, and June 2018).

Screenshot of the April 2018 drone video as posted on YouTube.

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FAIR Phase-0 experimental program The GSI accelerators had started operation with almost no delay and the Super-heavy element (SHE) Collaboration had successfully taken first beam at UNILAC in June for their experiments. Further NUSTAR experiments were scheduled at SIS/FRS following the discussion and negotiations in the NUSTAR Beam Time Coordination Committee (together with all spokespersons of planned experiments - as accepted by GSI PAC - and the GSI beam time coordinator) in order to efficiently make use of the beams offered by GSI.

Unfortunately, some technical issues and, in particular, a fire in the UNILAC area stopped the normal operation. Presently, the accelerator division, together with the operations team, is looking into mitigating actions to bring the GSI accelerator system back in operation to continue with the experiment program as soon as possible. In case you plan to come for a beam time, please contact the spokesperson of your experiment and wait for an update of the beam time schedule. In general, further information on the GSI beam time can be found on the GSI web site. News from the Boards and Committees BR (NUSTAR Board of Representatives) The NUSTAR Board of Representatives (BR) discussed during its meeting at the NUSTAR Annual meeting:

• Election of new members:

The NUSTAR Council members decided by electronic vote on the two new members of the NUSTAR BR, replacing Allison Bruce and Nasser Kalantar-Nayestanaki who finished their second two-year term at the NUSTAR Annual meeting 2018. Out of the four candidates, Berta Rubio (left) and Iain Moore (right) received most of the votes by the NC members and were therefore elected as new BR members for the period 2018-2020.

• New Spokesperson and Deputy:

Subsequently, the newly formed BR decided on the new NUSTAR Spokesperson and Deputy Spokesperson. Finally, Wolfram Korten (left) and Haik Simon (right) were chosen to represent NUSTAR towards the FAIR management and committees.

Furthermore, the BR together with the NC will look into a new procedure to elect the NUSTAR Spokesperson, for example directly via the NUSTAR Council in an electronic vote, separated from the selection of new BR members.

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• Besides the usual interaction of the BR with the NUSTAR Experiments (e.g. in the Collaboration Committee), the other FAIR experiment Collaborations (via the BFC), and the FAIR management as well as its committees (e.g. the Joint Scientific Council), some additional tasks are on the agenda: The BR will work together with the NUSTAR Coordinators on the MoU of NUSTAR, which is required in order to establish a Common Fund for investment. Furthermore, the review of the FAIR project, which is planned in spring 2019, needs to be prepared and the BR is getting ready to discuss details with the FAIR management.

CC (NUSTAR Collaboration Committee) The NUSTAR Collaboration Committee also met during the NUSTAR Annual meeting and in June to discuss several issues, including:

• The “General conditions of Experiments”, a document that defines the rules and regulations for accepted experiments at FAIR, has been drafted and submitted to the FAIR management (together with the other FAIR experiment collaborations). Since this is part of the NUSTAR MoU, the feed-back from all NUSTAR experiments was required.

• For the coordination of the Phase-0 beam time, a NUSTAR Beam Time Coordination Committee was formed (chaired by C. Scheidenberger). Details of the NUSTAR beam time plan were discussed in close collaboration with the CC and monitored by the BR.

• The status of experiments was reviewed, with a focus on Phase-0 experiments as well as “Day one” configurations of all NUSTAR experiment expected for the start of FAIR operation. While a few TDRs for infrastructure are still pending, ILIMA has submitted three TDRs for its detector systems. Overall, the progress of the NUSTAR project and construction of components is monitored via a new status report, which will be used for the FAIR committees, e.g., the FAIR Council.

NC (NUSTAR Council) The NUSTAR Council discussed during the Annual meeting its new composition which should better reflect the representation of institutes that are active during the construction phase. A working group has been formed which shall formulate and refine new membership criteria. It is planned to have the approval of the present NUSTAR Council members by the NUSTAR Week 2018. Once established, the new composition of the NUSTAR Council shall be in place for the next election of NUSTAR BR members in January 2019. TB (NUSTAR Technical Board) The NUSTAR Technical Board discussed in depth during a retreat all topics related to cave infrastructure and installation planning. Presently, FAIR civil construction requests an update and, later in the year, a finalization of the information and plans from all experiments regarding their needs and the realization in the experiment caves (cable trays, cables, media supplies, power lines, etc.). All project managers of the NUSTAR sub-collaborations are asked to support the NUSTAR management team in keeping the NUSTAR project plans up-to-date.

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News on NUSTAR meetings NUSTAR Annual Meeting 2018 NUSTAR Collaboration meeting at GSI

The NUSTAR Annual Meeting 2018 was held at GSI from February 26 to March 2. More than 160 international participants discussed the substantial progress in the realization of FAIR and the NUSTAR experiments, especially the development and realization of detector setups and their associated infrastructure, both for Phase-0 and Phase-1. The upcoming Phase-0 experiments at GSI were discussed comprehensively and constructively. Furthermore, latest research highlights from successful experiments at GSI and other laboratories were broadly presented. During the full week many working groups used the opportunity to report on their developments, latest results and the next steps of their work.

For details see conference web page.

Participants of the NUSTAR Annual Meeting 2018 (photo: C. Völker).

Awards and prizes Lomonosov Gold Medal Russian Great Gold Medal to Björn Jonson

Björn Jonson, presently Chair of the NUSTAR Council, has been rewarded with the Russian Great Gold Medal, the highest award of the Russian Academy of Sciences (RAS), for his outstanding contributions to nuclear physics. The award ceremony was held in Moscow on March 30, 2018, at the General Meeting of the RAS. Since 1967, the Lomonosov Gold Medal is awarded each year to a Russian and a foreign scientist for their outstanding achievements in natural sciences and humanities. This year Yuri Oganessian was rewarded together with Björn Jonson.

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Björn Jonson (left) and Yuri Oganessian (right) received the Lomonosov Gold Medal in Moscow at the General Meeting of the Russian Academy of Sciences (Photo: Elena Puzynina, JINR).

For further information, see the news article on Chalmers web site. Knight of the Order of the Netherlands Lion Nasser Kalantar-Nayestanaki appointed Knight of the Order of the Netherlands Lion

On April 26, 2018, Nasser Kalantar-Nayestanaki, former NUSTAR Spokesperson (2014-2018), has been appointed Knight of the Order of the Netherlands Lion. Kalantar-Nayestanaki, professor of experimental nuclear physics at KVI-CART, received the award for his outstanding contributions to the field of nuclear physics on an international level as well as his great service to the Dutch Society on different issues. Especially, his leadership in the collaboration between KVI-CART and GSI, which also led to many contributions to FAIR, has been very much acknowledged.

For further information, see the news article on University of Groningen web site.

Nasser Kalantar-Nayestanaki (left) and the mayor of Groningen, Peter den Oudsten (right) during the

ceremony (Photo: Elmer Spaargaren).

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News from the NUSTAR experiments and Super-FRS SHE Probing nobelium isotopes with laser spectroscopy

S. Raeder, M. Block and M. Laatiaoui for the RADRIS collaboration

Laser spectroscopy is a well-established technique for investigating nuclear ground state properties of exotic isotopes and has recently been extended to the heavy element nobelium (No, Z=102). In a recent publication [1], the determination of nuclear properties of 252-254No was for the first time achieved using a tailored laser spectroscopic technique with highest sensitivity [2]. A prerequisite for these challenging experiments at the velocity filter SHIP at GSI was the identification of atomic transitions in the artificial element nobelium [3], whose atomic structure was until then experimentally unknown. Detailed studies of the atomic transitions allowed measuring the influence of the atomic nucleus on the atomic structure revealing the isotope shift for 252-254No and the hyperfine structure in the atomic spectrum of 253No. As no stable or long-lived reference isotope is available to calibrate the spectra, detailed atomic calculations were performed to finally deduce the nuclear properties from the experimental results independent of a particular nuclear model. The results confirmed an anticipated strong prolate deformation of the 253No nucleus while the determined changes in the differential charge radii agree well with density functional calculations that predict a strong central depression of the charge density in heavy and super heavy nuclei.

Left: Gas-filled optical cell for laser spectroscopy of nobelium isotopes: The cell is mounted behind the velocity filter SHIP (on left-hand side of photo). The glowing filament is used to evaporate nobelium atoms for laser spectroscopy (photo: G. Otto, GSI). Right: The experimental spectra from the laser spectroscopy of the three nobelium isotopes are shown in front of the calculated charge density distribution of No-254. (© S. Raeder, GSI).

These experiments paved the way for laser spectroscopy of even heavier nuclides in the future, enabling a systematic investigation of changes in size and shape of heavy nuclei in this region. Such experiments are presently only possible at GSI, Darmstadt and are crucial for a unique in-depth understanding of the atomic and nuclear structure of the heaviest elements.

References: [1] S. Raeder et al., Phys. Rev. Lett. 120, 232503 (2018) [2] F. Lautenschläger et al., Nucl. Instrum. Meth. Phys. Res. B 383, 115-122 (2016) [3] M. Laatiaoui et al., Nature 538, 495–498 (2016)

Contact: Sebastian Raeder (GSI)

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Super-FRS Contract award to manufacture Super-FRS SC-dipole magnets

The Facility for Antiproton and Ion Research in Europe GmbH (FAIR) located at Darmstadt (Germany) awarded on February 8, 2018 Elytt ENERGY S.L. in Madrid (Spain) to manufacture 21 standard SC-dipole units for the Super-FRS. In the preceding international tendering, Elytt competed successfully with several other European manufacturers. The contract amount is about 11.7 Million Euros, which is one of the largest purchases within the FAIR accelerator.

The application of superconducting magnets assures an efficient use of relativistic secondary beams characterized by a large phase-space. Large-acceptance dipole magnets will provide the required separation power. Each dipole unit has a deflection angle of 11° (pre-separator of Super-FRS) and 9.75° (main-separator of Super-FRS), respectively, a bending radius of 12.5 m and a weight of 50 to 60 ton. The magnets will consist of warm iron yokes which will define and guarantee the required magnetic field quality and superconducting coils which are embedded in a cryostat designed to withstand a required pressure of 20 bar.

The kick-off meeting took place on March 1, 2018 at Bilbao (Spain) where the construction site of Elytt is located. It is envisaged to develop a first-of-series dipole unit until mid of 2019. This will then be tested extensively at CERN, Geneva (Switzerland) prior to the series production of the remaining 20 dipole units.

3D model of the SC dipole unit (left panel) and members of the project kick-off meeting at the construction site of Elytt in Bilbao, Spain (right panel).

Contact: Martin Winkler (GSI) R3B – NeuLAND Installation in Cave C

Four double planes of NeuLAND returned at the end of September 2017 to GSI and will be used together with additional completed units during the Phase-0 program of R3B. The first tests of the NeuLAND detector and subsequent experiments at RIKEN have been very successful. The returned planes together with several newly produced ones are currently upgraded and prepared to work with the meanwhile evolved series version of the

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electronics and high voltage supply system. First tests of the final system configuration, which include about 1/3 of the full version, are currently ongoing in Cave C. The partial detector will be used for first commissioning runs and experiments during the last quarter of this year.

Left: NeuLAND double planes just before the installation in Cave C of GSI. Right: NeuLAND in Cave C with read-

out electronics installed.

Contact: Konstanze Boretzky and Haik Simon (GSI) R3B - GLAD GLAD cooling down

The large acceptance dipole GLAD has been cooled down to its nominal temperature. There will be further tests on the current supply system and sensors before ramping up the magnet for quench training and eventually the commissioning run in late autumn this year.

GLAD in Cave C cooling down for operation.

Contact: Haik Simon (GSI)

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NUSTAR in-kind contracts Progress with in-kind and collaboration contracts for NUSTAR experiment

The FAIR shareholders provide about one third of the experiment funding as in-kind contributions. The scope and conditions of these contributions is defined in in-kind contracts. Up to date, two such contracts have been signed, one for the high-voltage distribution system of NeuLAND and one for the Proton Arm Spectrometer (both Russian in-kind provided by PNPI Gatchina). Several other in-kind contracts are in preparation, for example for the GLAD magnet, for the CALIFA detector, as well as the active target ACTAF2. Similarly, for the MONSTER and DEGAS detectors of the HISPEC/DESPEC experiment, in-kind contracts are in the final stage and are expected to be signed in the next months.

Crystals for CALIFA stored at Lund University, ready to be shipped to GSI as Swedish in-kind contribution to

NUSTAR (photo: Joakim Cederkall).

Contact: Alexander Herlert (FAIR)

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Some acronyms AFC Administrative and Finance Committee of FAIR BFC Board of FAIR Collaborations BR NUSTAR Board of Representatives ECE Expert Committee Experiments MoU Memorandum of Understanding NC NUSTAR Council PAC Program Advisory Committee RB NUSTAR Resource Board TB NUSTAR Technical Board TDR Technical Design Report