1 / 14

Beta strength measurements near to the 3rd r-process peak

Beta strength measurements near to the 3rd r-process peak. (South-west of 208 Pb). Darmstadt-Gatchina-Madrid-Santiago-Surrey- Valencia …. DESPEC TAS. +. AIDA. Jose L. Tain @ IFIC-Valencia. PRESPEC Decay Workshop, Brighton, January 12-13, 2011.

sahara
Download Presentation

Beta strength measurements near to the 3rd r-process peak

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Beta strength measurements near to the 3rd r-process peak (South-west of 208Pb) Darmstadt-Gatchina-Madrid-Santiago-Surrey-Valencia… DESPEC TAS + AIDA Jose L. Tain @ IFIC-Valencia PRESPEC Decay Workshop, Brighton, January 12-13, 2011

  2. Beta strength calculations are needed in order to obtain T1/2 and Pn values for most of the nuclei involved in r-process calculations : 0+ Fermi : 1+ Gamow-Teller : 0-,1- Non-unique first forbidden : 2- Unique first forbidden … • The quality of the model calculations is judged by comparison with experimental T1/2 and eventually Pn values in particular for the most neutron rich accessible nuclei, which are however integral quantities • Direct comparison of calculated and measured S provides a more stringent test of the nuclear structure models

  3. Total Absorption Gamma-ray Spectroscopy: • Uses large 4 scintillation detectors,aimingto detect the full -ray cascade rather than individual -rays -decay real TAS spectrum (deconvolution) strength ideal TAS (=100%) Inverse problem MC simulations + know level sch. + statistical model

  4. FF GT “South-west” of 208Pb • “Close” to r-process 3rd abundance peak • Decay dominated by FF transitions • Largely unexplored but accessible at GSI r-process

  5. 200Os (Z=76, N=124) • Borzov, Phys.At.Nucl. (2011) • DF+QRPA • both GT and FF microscopic • no deformation Q = 2.6 MeV (SY) Expected number of levels: Nlev=800 Goriely et al. PRC78(08) 064307

  6. 202Ir (Z=77, N=125) Expected number of levels: Nlev=4.1104 Q = 5.4 MeV (SY)

  7. |2| deformation • Further into the play: deformation Moeller et al., ADNDT59(95)185 (Exp: NuDat)

  8. PRC67(03)055802 : GT+FF ADNDT66(97)131 : GT • Moeller et al. • FRDM+QRPA • FF from Gr.Th. • deformation • exper. Q, Sn T1/2 Pn

  9. DF3: Borzov, Phys.At.Nucl. (2011), FRDM: Moeller et al., PRC67(03)055802 Z=76 Z=77 Z=78 Z=79

  10. J. Benlliure et al., NIC XI, Heidelberg, 2011 • Region accessible with enough statistics (204Au,204,203Pt, 201Ir,…) 208Pb (1GeV/u) + Be (2.5g/cm2) • T. Kurtukian et al., NPA827 (2009) 687c • A.I. Morales, PhD Thesis, U. Santiago, 2011

  11. A.I. Morales, PhD Thesis, U. Santiago, 2011  Q = 2.3 MeV (SY) Q = 5.4 MeV (SY) Nlev=2.7103 Nlev=4.1104

  12. J. Benlliure et al., NIC XI, Heidelberg, 2011 C. Domingo-Pardo et al., Experiment S410

  13. 16 + 1 modules: 151525 cm3 NaI(Tl) + 5” PMT (50% light col.) V= 95 L, M= 351 kg PROTOTYPE RE= 6.8% @662keV t(FWHM) = 4.5 ns Light collection MC simulation Exp. • Half detector will be ordered this year • The rest in 2012

More Related