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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>82</mml:mn></mml:math>Shell Quenching of the Classical<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>r</mml:mi></mml:math>-Process “Waiting-Point” Nucleus<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">d</mml:mi></mml:mrow><mml:mprescripts/><mml:none/><mml:mn>130</mml:mn></mml:mmultiscripts></mml:math>

I. DillmannInstitut für Kernchemie, Universität Mainz, Mainz, Germany and Departement für Physik und Astronomie, Universität Basel, Basel, SwitzerlandKarl KratzInstitut für Kernchemie, Universität Mainz, Mainz, GermanyA. WöhrDepartment of Chemistry, University of Maryland, College Park, Maryland, USAO. ArndtInstitut für Kernchemie, Universität Mainz, Mainz, GermanyB. A. BrownDepartment of Physics and Astronomy and NSCL, Michigan State University, East Lansing, Michigan, USAP. HoffDepartment of Chemistry, University of Oslo, Oslo, NorwayM. Hjorth‐JensenDepartment of Physics, University of Oslo, Oslo, NorwayU. KösterCERN, Geneva, SwitzerlandA. N. OstrowskiInstitut für Kernchemie, Universität Mainz, Mainz, GermanyB. PfeifferInstitut für Kernchemie, Universität Mainz, Mainz, GermanyD. SeweryniakPhysics Division, Argonne National Laboratory, Argonne, Illinois, USAJ. ShergurDepartment of Chemistry, University of Maryland, College Park, Maryland, USAW. B. WaltersDepartment of Chemistry, University of Maryland, College Park, Maryland, USA

2003lv

ABI

Annotatsiya

First $\ensuremath{\beta}$- and $\ensuremath{\gamma}$-spectroscopic decay studies of the $N=82$ $r$-process ``waiting-point'' nuclide $^{130}\mathrm{C}\mathrm{d}$ have been performed at CERN/ISOLDE using the highest achievable isotopic selectivity. Several nuclear-physics surprises have been discovered. The first one is the unanticipatedly high energy of 2.12 MeV for the [$\ensuremath{\pi}{g}_{9/2}\ensuremath{\bigotimes}\ensuremath{\nu}{g}_{7/2}]$ ${1}^{+}$ level in $^{130}\mathrm{I}\mathrm{n}$, which is fed by the main Gamow-Teller transition. The second surprise is the rather high ${Q}_{\ensuremath{\beta}}$ value of 8.34 MeV, which is in agreement only with recent mass models that include the phenomenon of $N=82$ shell quenching. Possible implications of these new results on the formation of the $A\ensuremath{\simeq}130$ $r$-process abundance peak are presented.

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DOI: 10.1103/physrevlett.91.162503

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