$\gamma$-ray linear polarization measurements and $(g_{9/2})^{-3}$ neutron alignment in $^{91}$Ru - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review C Year : 2013

$\gamma$-ray linear polarization measurements and $(g_{9/2})^{-3}$ neutron alignment in $^{91}$Ru

B. Cederwall
  • Function : Author
R. Wadsworth
  • Function : Author
T. Bäck
  • Function : Author
F. Ghazi Moradi
  • Function : Author
G. Jaworski
  • Function : Author
B. M. Nyakó
  • Function : Author
J. Nyberg
  • Function : Author
M. Palacz
  • Function : Author
H. Al-Azri
  • Function : Author
G. de Angelis
  • Function : Author
A. Atac
  • Function : Author
Ö. Aktaş
  • Function : Author
T. Brock
  • Function : Author
P. J. Davies
  • Function : Author
A. Di Nitto
  • Function : Author
Zs. Dombradi
  • Function : Author
A. Gadea
  • Function : Author
J. Gal
  • Function : Author
P. Joshi
  • Function : Author
K. Juhasz
  • Function : Author
R. Julin
  • Function : Author
A. Jungclaus
  • Function : Author
G. Kalinka
  • Function : Author
J. Kownacki
  • Function : Author
G. La Rana
  • Function : Author
S. M. Lenzi
  • Function : Author
J. Molnar
  • Function : Author
R. Moro
  • Function : Author
D. R. Napoli
  • Function : Author
B. S. Nara Singh
  • Function : Author
A. Persson
  • Function : Author
F. Recchia
  • Function : Author
M. Sandzelius
  • Function : Author
J. -N. Scheurer
  • Function : Author
G. Sletten
  • Function : Author
D. Sohler
P. -A. Söderström
  • Function : Author
M. J. Taylor
  • Function : Author
J. Timar
  • Function : Author
J. J. Valiente-Dobon
  • Function : Author
E. Vardaci
  • Function : Author

Abstract

Linear polarization measurements have been performed for $\gamma$-rays in $^{91}$Ru produced with the $^{58}$Ni($^{36}$Ar, $2p1n$$\gamma$)$^{91}$Ru reaction at a beam energy of 111 MeV. The EXOGAM Ge clover array has been used to measure the $\gamma$-$\gamma$ coincidences, $\gamma$-ray linear polarization and $\gamma$-ray angular distributions. The polarization sensitivity of the EXOGAM clover detectors acting as Compton polarimeters has been determined in the energy range 0.3$-$1.3 MeV. Several transitions have been observed for the first time. Measurements of linear polarization and angular distribution have led to the firm assignments of spin differences and parity of high-spin states in $^{91}$Ru. More specifically, calculations using a semi-empirical shell model were performed to understand the structures of the first and second (21/2$^{+}$) and (17/2$^{+}$) levels. The results are in good agreement with the experimental data, supporting the interpretation of the non yrast (21/2$^{+}$) and (17/2$^{+}$) states in terms of the $J_{\rm max}$ and $J_{\rm max}-2$ members of the seniority-three $\nu(g_{9/2})^{-3}$ multiplet.

Dates and versions

in2p3-00812347 , version 1 (12-04-2013)

Identifiers

Cite

Y. Zheng, G. de France, E. Clément, A. Dijon, B. Cederwall, et al.. $\gamma$-ray linear polarization measurements and $(g_{9/2})^{-3}$ neutron alignment in $^{91}$Ru. Physical Review C, 2013, 87, pp.044328. ⟨10.1103/PhysRevC.87.044328⟩. ⟨in2p3-00812347⟩
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