Ann-Cecilie Larsen

Image of Ann-Cecilie Larsen
Norwegian version of this page
Phone +47 22855486
Room V104
Visiting address Physics building Sem Sælandsvei 24 0371 Oslo
Postal address Postboks 1048 Blindern 0316 Oslo

Academic Interests

What happens if the atomic nucleus is heated to several billion degrees?

How were the elements that we know of in the Universe made?

The tiny atomic nucleus is one of the most interesting quantum systems to investigate. The nuclear physics group at the Oslo Cyclotron Laboratory (OCL) has developed a method to measure the properties of atomic nuclei at very high temperatures. At these temperatures, the most important properties are the level density, which is how many quantum states available for the nucleus at a given excitation energy, and the gamma-ray strength function, which is a measure of the probability of electromagnetic decay for a certain gamma energy. These two quantities are indispensable for estimating astrophysical reaction rates, which in turn are used for modeling the creation of the various elements in the Universe.


Spring 2023 -: FYS1100 - Mekanikk og modellering  

Spring 2021 and 2022: FYS-MEK1110 - Mechanics 

Spring 2019 -: Lecturer, FYS4515 - Nuclear Physics I 

Previous teaching


Higher education and employment history

Cand.mag. in Physics, Dec. 2002, Department of Physics, University of Oslo

Cand.scient. in Nuclear Physics, June 2004, Department of Physics, University of Oslo

Ph.D. in Nuclear Physics, May 2008, Department of Physics, University of Oslo

Research fellow, OCL nuclear physics group, June 2008 - Feb 2009, Department of Physics, University of Oslo

Post.doc., OCL nuclear physics group, Nov. 2009 - Feb 2011, Department of Physics, University of Oslo

Personal postdoc grant, Research Council of Norway, Nov 2011 - Oct 2014, Department of Physics, University of Oslo

Guest researcher, Université Libre de Bruxelles, spring 2013

Guest researcher, UC Berkeley/Lawrence Berkeley National Lab/Lawrence Livermore National Lab, fall 2013

Guest researcher, National Superconducting Cyclotron Laboratory/Michigan State University, summer 2014 

Fulbright fellow at the National Superconducting Cyclotron Laboratory/Michigan State University, fall 2016

Fulbright fellow at UC Berkeley/Lawrence Berkeley National Lab, spring 2017



Fulbright Scholarship, 2016-2017

Member of the Norwegian Academy for Science and Letters, 2017-

Prize for Young, Excellent Researchers, Research Council of Norway, fall 2016

Starting Grant (STG-ERC-2014), European Research Council, Grant Agreement No. 637686,  2015-2020

Personal postdoc grant from the Research Council of Norway, Project Grant No. 205528, 2011-2014

Best poster presentation award, Zakopane Conference on Nuclear Physics, 2006



Oslo Syklotronlaboratorium (OCL),

Université Libre de Bruxelles,

Lawrence Livermore National Laboratory,

Facility for Rare Isotope Beams, Michigan State University





Tags: nuclear physics, nuclear astrophysics, detectors, Instrumentation


View all works in Cristin

  • Sørbø, Solveig & Larsen, Ann-Cecilie (2022). Ann-Cecilie Larsen om kjerneastrofysikk, løping og musikk. [Radio]. radiOrakel og podcast.
  • Larsen, Ann-Cecilie (2021). Solveigs speisa musikk Ann-Cecilie Larsen Om Kjerneastrofysikk, Løping Og Musikk. [Radio]. Podkast og radio.
  • Larsen, Ann-Cecilie (2021). Abels tårn - om gull og protoner. [Radio]. NRK P2 Ekko.
  • Larsen, Ann-Cecilie (2021). Abels tårn - om fusjon. [Radio]. NRK P2 Ekko.
  • Larsen, Ann-Cecilie (2021). The quest for the origin of heavy elements.
  • Larsen, Ann-Cecilie (2020). A bright-matter mystery: the quest for the origin of the elements.
  • Larsen, Ann-Cecilie (2020). Experimentally constrained neutron-capture rates for the intermediate and rapid neutron-capture processes.
  • Larsen, Ann-Cecilie (2019). Indirect, experimental constraints of (n,γ) reaction rates for the i- and r-process.
  • Larsen, Ann-Cecilie (2019). Constraining neutron-capture rates relevant to r-process and i-process nucleosynthesis.
  • Larsen, Ann-Cecilie (2019). Leading an ERC StG research team - some experiences and thoughts.
  • Larsen, Ann-Cecilie (2019). Mysteriet i hjertet av atomet - hvor lenge overlever nøytroner på avveie?
  • Larsen, Ann-Cecilie (2018). Constraining neutron-capture rates for r-process scenarios.
  • Larsen, Ann-Cecilie (2018). The beta-Oslo method: experimentally constrained (n,gamma) reaction rates relevant to the r-process.
  • Midtbø, Jørgen E.; Larsen, Ann-Cecilie & Renstrøm, Therese (2018). Extracting γ-strength functions from shell model calculations.
  • Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Midtbø, Jørgen E.; Crespo Campo, Lucia; Görgen, Andreas & Ingeberg, Vetle Wegner [Show all 11 contributors for this article] (2017). Gamma-widths, lifetimes and fluctuations in the nuclear quasi-continuum.
  • Larsen, Ann-Cecilie (2017). Alkymisten. [Newspaper]. Magasinet, Dagbladet.
  • Larsen, Ann-Cecilie (2017). Stjernestøv, supernovaer og atomkjerner – hvordan ble grunnstoffene til?
  • Larsen, Ann-Cecilie (2016). Programdeltagelse, Abels tårn. [Radio]. Radio, nettradio (NRK P2).
  • Tveten, Gry Merete; Spyrou, Artemis; Schwengner, Ronald; Naqvi, Farheen; Larsen, Ann-Cecilie & Eriksen, Tomas Kvalheim [Show all 22 contributors for this article] (2016). The Statistical Properties Of 92Mo And Implications For The p-process.
  • Larsen, Ann-Cecilie (2016). Novel techniques for constraining neutron-capture rates relevant to heavy-element nucleosynthesis.
  • Guttormsen, Magne Sveen; Larsen, Ann-Cecilie; Görgen, Andreas; Renstrøm, Therese; Siem, Sunniva & Tornyi, Tamas Gabor [Show all 7 contributors for this article] (2016). Is the generalized Brink-Axel hypothesis valid?
  • Larsen, Ann-Cecilie (2016). Paneldeltager Abels tårn, Ekko P2. [Radio]. Realfagsbiblioteket, UiO.
  • Larsen, Ann-Cecilie (2016). Experimental level densities and gamma strength functions for nuclear astrophysics.
  • Larsen, Ann-Cecilie (2015). Workshop on the (beta-)Oslo method, NSCL/MSU.

View all works in Cristin

Published Nov. 4, 2010 12:22 PM - Last modified Sep. 5, 2022 6:51 PM