Prsentation PowerPoint

Alain Coc CSNSM(Centre de Sciences Nuclaires et de Sciences de la Matire, Orsay)+material from:F. Hammache, N. de Srville, F. de Oliveira, V. Tatischeff, J. Margueron Nuclear Astrophysics in France13 (IN2P3 & CEA) Laboratories: CENBG (Bordeaux), GANIL (Caen), LPC Caen, LPSC (Grenoble), Subatech (Nantes), LUPM (Montpellier), CSNSM (Orsay), IPNO (Orsay), LLR (Palaiseau), APC (Paris), Irfu/SPhN & Irfu/SAp (Saclay), IPHC (Strasbourg)

Collaboration with Institut National des Sciences de l'Univers (INSU) Laboratories: IAP (Paris), IRAP (Toulouse),....1Motivations:Source of stellar energy, stellar evolutionOrigin of the elements (elemental and isotopic abundances)Constraints on astrophysical models: Stellar surface abundances, nuclear gamma-ray emission, meteorites,Application in astroparticles, cosmological and fundamental physics: Cosmic rays, primordial nucleosynthesis, variation of constants,. An interdisciplinary domain by natureNuclear Astrophysics

Primordial nucleosynthesisHydrogen burningHelium burninge-process (iron peak)x-process (Li, Be, B): non- thermal nucleosynthesisr-process (rapid n-capture) s-process (slow n-capture)p-process (proton rich)Subsequent burning processes (12C+12C, 16O+12C, 16O+16O)Origin of the ElementsAlready a long history [B2FH], also in France (in the 60s) BBN, LiBeB3Direct measurements Very small cross sections

Indirect measurements

Transfert reactions 13C(7Li,t)17O [13C(, n)16O] Resonant elastic diffusion 12C(,)12C [12C(, )16O] Coulomb dissociation 6Li(*,)D [D(,)6Li] Trojan Horse Method D(7Li,)n [6Li(p,)4He]Model dependent Gamow windowDirect/indirect measurements12C(,)16O, 14C(, )18O, 18O(, )22Ne et 22Ne(,)26Mg NUPPEC Long Range PlanMost important reactions Required precision: 10 %

BBN calculation of of 4He, D, 3He, 7Li primordial abundances at Planck baryonic density compared with observations.Used to constrain new physics e.g. variation of constants, exotic particles,..., but...The Lithium Problem: a factor of 3 7Li overproductionObservations? New physics? orA nuclear solution ? New 7Be destruction channels (decays to 7Li) 7Be+3He10C*, 7Be+11C*Primordial Nucleosynthesis7Li from 7Be decay 5 He shell

No obvious additional state in 10C at ~ 15 MeV

natB(3He,t)11C No additional state in 11C at ~ 7.8 MeV If present total 590 keV (95% CL)Rules out a nuclear solution [Hammache+ 2013] (3He,t) reaction on 10,11B targetswith the Split-pole magnetic spectrometer at the Orsay TandemSearch for unknown states in 10C and 11C 10B(3He,t)10C 6(Explosive) Hydrogen burning: two examples

Spectroscopy of 19Ne for 18F(p,)15O reactionGanil experiment [Mountford+ 2012] / predictions [Dufour & Descouvemont 2007]19F(3He,t)19Ne experiment at Orsay [IPNO, York, Barcelona] in 2014

The 17O(p,)14N and 17O(p,)18F reactions (PAPAP, now at Democritos)on/off resonnance [Chaffa+ 2005; 2007]s-process nucleosynthesis half of the heavy elements 90