W. Udo Schröder, 2007 Applications Applications of Nuclear Instruments and Methods 1.

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Presentation transcript:

W. Udo Schröder, 2007 Applications Applications of Nuclear Instruments and Methods 1

W. Udo Schröder, 2007 Applications Nuclear Space Technology Sojourner Pathfinder Mars explorer Radiation detector Nuclear radiation detectors are used in explorations of the sun and its planets. Space vehicles use them to detect and identify directly emitted or back-scattered radiation. Surface materials on Mars have been analyzed with activation methods using radioactive sources. 2

W. Udo Schröder, 2007 Applications Group project: N* Detector for Application in Nuclear Forensics Activation Radiation from Planetary Surface 3

W. Udo Schröder, 2007 Applications Nucleosynthesis r-p process (rapid-proton capture) produces heavy elements. r process (rapid-neutron capture) Strong T dependence Details of nuclear structure and stability and the conditions at formation (star, Big Bang) account for the natural abundance of elements. Much of the information needed is not yet known  Task of future experiments. reaction path 4

W. Udo Schröder, 2007 Applications Too many heavy elements for production in solar burning processes. Temperature is too low in solar interior ( T 9 = K,  = 158 g/cm 3 ). Sun is result of evolution through several stellar life cycles (accretion of interstellar dust, ignition, burning, collapse and explosion) Abundance of Solar Elements 5

W. Udo Schröder, 2007 Applications Supernovae Large Magellanic Cloud Kamiokande II 0.85 MeV and 1.24 MeV  -rays from 56 Co synthesized in the SN. Time-of-flight spectrum of neutrinos, measured relative to  -rays. 6

W. Udo Schröder, 2007 Applications Supernova Explosion Imaged by Hubble Space Telescope Supernova 1994D in Galaxy NGC 4526 (108 M ly). It is brighter than the galaxy. (Hubble Space Telescope, NASA) 7

Supernova: Collapse and Explosion of a Star (Simulation:NASA) 8

W. Udo Schröder, 2007 Applications Binary X-Ray System: Neutron Star/Companion Star Neutron star and companion in a binary system. Accretion disk is created from matter pulled out of the companion. Matter impinging on the neutron star’s surface creates nuclear reactions. sp and rp processes proceed rapidly along drip lines and drive X-ray bursts that can be observed on earth. Image:NASA 9

W. Udo Schröder, 2007 Applications Structure of a Neutron Star NSCL-ISF Proposal,

W. Udo Schröder, 2007 Applications rp Reactions flow during X-Ray Burst rp reaction flow (red line) during X- ray burst. The series ends at the Sn-Sb-Te cycle. 11

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