$N=50$ core excited states studied in the ${}_{46}^{96}$Pd${}_{50}$ nucleus

$N = 50$ core excited states studied in the $_{46}^{96}$ Pd $_{50}$ nucleus

M. Palacz, J. Nyberg, H. Grawe, K. Sieja, G. de Angelis, P. Bednarczyk, A. Blazhev, D. Curien, Z. Dombradi, O. Dorvaux, J. Ekman, J. Gałkowski, M. Górska, J. Iwanicki, G. Jaworski, J. Kownacki, J. Ljungvall, M. Moszyński, F. Nowacki, D. Rudolph, D. Sohler, D. Wolski, and M. Ziębliński

Phys. Rev. C 86, 014318 – Published 17 July 2012

Abstract

The four-proton hole $^{96} Pd$ neighbor of the doubly-magic $^{100} Sn$ nucleus was studied in-beam, using a fusion-evaporation reaction of a $^{58} Ni$ beam on a $^{45} Sc$ target. States of $^{96} Pd$ were established up to an excitation energy of 9707 keV. A core-excited odd-parity isomer with $T_{1 / 2} = 37.7 (1.1)$ ns was identified. Shell model calculations were performed in four different model spaces. Even-parity states of $^{96} Pd$ are very well reproduced in large-scale shell model (LSSM) calculations in which excitations are allowed of up to five $g_{9 / 2}$ protons and neutrons across the $N = Z = 50$ gap, to the $g_{7 / 2}$ , $d_{5 / 2}$ , $d_{3 / 2}$ , and $s_{1 / 2}$ orbitals. The odd-parity isomer can be only qualitatively interpreted though, employing calculation in the full $f p g$ shell model space, with just one particle-hole core excitation.

Received 31 May 2012

DOI:https://doi.org/10.1103/PhysRevC.86.014318

Authors & Affiliations

M. Palacz¹, J. Nyberg², H. Grawe³, K. Sieja⁴, G. de Angelis⁵, P. Bednarczyk⁶, A. Blazhev^3,7,*, D. Curien⁴, Z. Dombradi⁸, O. Dorvaux⁴, J. Ekman⁹, J. Gałkowski^1,10, M. Górska³, J. Iwanicki¹, G. Jaworski^1,10, J. Kownacki¹, J. Ljungvall¹¹, M. Moszyński¹², F. Nowacki⁴, D. Rudolph⁹, D. Sohler⁸, D. Wolski¹², and M. Ziębliński⁶

¹Heavy Ion Laboratory, University of Warsaw, ul. Pasteura 5A, 02-093 Warszawa, Poland
²Department of Physics and Astronomy, Uppsala University, S-75120 Uppsala, Sweden
³GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
⁴Université de Strasbourg, IPHC, 23 rue du Loess 67037 Strasbourg, France, CNRS, UMR7178, 67037 Strasbourg, France
⁵INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
⁶The H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
⁷Faculty of Physics, University of Sofia, BG-1164 Sofia, Bulgaria
⁸Institute of Nuclear Research ATOMKI, Hungarian Academy of Sciences, H-4001 Debrecen, Hungary
⁹Department of Physics, University of Lund, S-22100 Lund, Sweden
¹⁰Faculty of Physics, Warsaw University of Technology, 00-661 Warszawa, Poland
¹¹CSNSM, Bâtiments 104 et 108, 91405 Orsay Cedex, France
¹²National Centre for Nuclear Research, 05-400 Otwock-Świerk, Poland

^*Present address: Institut für Kernphysik, Universität zu Köln, D-50937 Köln, Germany.

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Vol. 86, Iss. 1 — July 2012

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