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R-process experiments at the National Superconducting Cyclotron Laboratory Giuseppe Lorusso NSCL at Michigan State university.

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Presentation on theme: "R-process experiments at the National Superconducting Cyclotron Laboratory Giuseppe Lorusso NSCL at Michigan State university."— Presentation transcript:

1 R-process experiments at the National Superconducting Cyclotron Laboratory Giuseppe Lorusso NSCL at Michigan State university

2 Models aimed to reproduce the observed r-process abundances are sensitive to: astrophysical conditions the nuclear properties of the neutron-rich nuclei involved in the process Masses of nuclei near the drip line  -decay-properties »  -decay-half lives »  -delayed neutron emission probabilities

3 Effect of shell quenching

4 Effect of  -delayed neutron emission probabilities before  -decayafter  -decay Calculated r-process production of elements (Kratz et al. ApJ 403 (1993) 216):

5 Implantation set up BCS+NEROSEGA Si PIN detector

6 Particle Identification Transmitted species are identified according to their position in the particle-ID matrix with respect of nuclei of reference

7 Beta Counting System  Si 4 cm x 4 cm active area 1 mm thick 40-strip pitch in x and y dimensions ->1600 pixels

8 Neutron Emission Ratio Observer Specifications: 60 counters total (16 3He, 44 BF3) 60 cm x 60 cm x 80 cm polyethylene block Extensive exterior shielding 45% total neutron efficiency

9 BCS + NERO

10 Half-lives

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