# Multi-quasiparticle excitations of 91Ru

• The level structure in neutron-deficient nucleus 91Ru was investigated via the 58Ni (36Ar, 2p1n$\gamma$) 91Ru reaction at a beam energy of 111 MeV. Charged particles, neutrons, and $\gamma$-rays were emitted in this reaction and detected by the DIAMANT CsI ball, Neutron Wall, and the EXOGAM Ge clover array, respectively. In addition to the previously reported levels in 91Ru, new low-to-medium spin states were observed. Angular correlation and linear polarization measurements were performed to unambiguously determine spins and parities of the excited states in 91Ru. The low-spin states of 91Ru exhibit a scheme of multi-quasiparticle excitations, which is very similar to that of the neighboring $N=47$ isotone. These excitations have been interpreted in terms of the shell model. The calculations performed in the configuration space $(p_{3/2},f_{5/2},p_{1/2},g_{9/2})$ reproduce the experimental excitation energies reasonably well, supporting the interpretation of the newly assigned positive-parity states in terms of the three quasiparticle configurations $\pi(g_{9/2})^{-2} \nu(g_{9/2})^{-1}$ and $\nu (g_{9/2})^{-3}$.
•  [1] S. E. Arnell, S. Sjöberg, Ö. Skeppstedt et al, Nucl. Phys. A, 280: 72 (1977) [2] L. Lühmann, K. P. Lieb, A. Moussavi-Zarandi et al, Z. Phys. A, 313: 297 (1983) [3] M. Weiszflog, D. Rudolph, C. J. Gross et al, Z. Phys. A, 344: 395 (1993) [4] M. Weiszflog, A. Jungclaus, D. Kast et al, Z. Phys. A, 353: 7 (1995) doi: 10.1007/BF01297717 [5] A. L. Goodman , Adv. Nucl. Phys., 11: 263 (1979) [6] J. E. Kitching, P. A. Batay-Csorba, C. A. Fields et al, Nucl. Phys. A, 302: 159 (1978) [7] S. E. Arnell, D. Foltescu, H. A. Roth et al, Phys. Scr., 47: 355 (1993) doi: 10.1088/0031-8949/47/3/005 [8] J. Heese, H. Grawe, K. H. Maier et al, Phys. Rev C, 49: 1896 (1994) doi: 10.1103/PhysRevC.49.1896 [9] S. Dean, M. Górska, F. Aksouh et al, Eur. Phys. J. A, 21: 243 (2004) doi: 10.1140/epja/i2003-10204-2 [10] M. Górska, S. Dean, V. Prasad et al, Proceedings of the International Workshop “Selected Topics on N=Z nuclei”, Eds. Rudolph D and Hellström M. Lund, Sweden, 2000. 46 [11] Y. Zheng, G. France, E. Clément et al, Phys. Rev. C, 87: 044328 (2013) doi: 10.1103/PhysRevC.87.044328 [12] J. N. Scheurer, M. Aiche, M. M. Aleonard et al, Nucl. Instrum. Methods Phys. Res. A, 385: 501 (1997) doi: 10.1016/S0168-9002(96)01038-8 [13] J. Gál, G. Hegyesi, J. Molnár et al , Nucl. Instrum. Methods Phys. Res. A, 516: 502 (2004) doi: 10.1016/j.nima.2003.08.158 [14] Ö. Skeppstedt, H. A. Roth, L. Lindström et al, Nucl. Instrum. Methods Phys. Res. A, 421: 531 (1999) doi: 10.1016/S0168-9002(98)01208-X [15] J. Simpson, F. Azaiez, G. France et al, Acta Physica Hungarica, New Series, Heavy Ion Physics, 11: 159 (2000) [16] K. S. Krane, R. M. Steffen, and R. M. Wheeler, Nucl. Data Tables, 11: 351 (1973) doi: 10.1016/S0092-640X(73)80016-6 [17] B. Schlitt, U. Maier, H. Friedrichs et al, Nucl. Instrum. Methods Phys. Res. A, 337: 416 (1994) doi: 10.1016/0168-9002(94)91111-8 [18] B. Cederwall, F. Ghazi Moradi, T. Back et al, Nature, 469: 68 (2011) doi: 10.1038/nature09644 [19] M. Hasegawa and K. Kaneko , Phys. Rev. C, 59: 1449 (1999) [20] M. Hasegawa, K. Kaneko, and S. Tazaki, Nucl. Phys. A, 674: 411 (2000) [21] M. Hasegawa, K. Kaneko, T. Mizusaki et al, Nucl. Phys. A, 688: 765 (2001) [22] M. Hasegawa, K. Kaneko, and S. Tazaki, Prog. Theor. Phys., 107: 731 (2002) [23] M. Hasegawa, K. Kaneko, T. Mizusaki et al, Phys. Rev. C, 69: 034324 (2004) doi: 10.1103/PhysRevC.69.034324 [24] W. Rae, the article and the NuShellX code on the Web Site http://knollhouse.org., released in 2008

Figures(3) / Tables(3)

Get Citation
Yong Zheng, G. de France, Xiao-Hong Zhou, Shan Huang and Min-Liang Liu. Multi-quasiparticle excitations of 91Ru[J]. Chinese Physics C, 2020, 44(2): 024002. doi: 10.1088/1674-1137/44/2/024002
Yong Zheng, G. de France, Xiao-Hong Zhou, Shan Huang and Min-Liang Liu. Multi-quasiparticle excitations of 91Ru[J]. Chinese Physics C, 2020, 44(2): 024002.
Milestone
Article Metric

Article Views(329)
Cited by(0)
Policy on re-use
To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.
###### 通讯作者: 陈斌, bchen63@163.com
• 1.

沈阳化工大学材料科学与工程学院 沈阳 110142

Title:
Email:

## Multi-quasiparticle excitations of 91Ru

###### Corresponding author: Yong Zheng, zhengyong@impcas.ac.cn
• 1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
• 2. Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM - CNRS/IN2P3, Bd Henri Becquerel, BP 55027, F-14076 Caen Cedex 5, France

Abstract: The level structure in neutron-deficient nucleus 91Ru was investigated via the 58Ni (36Ar, 2p1n$\gamma$) 91Ru reaction at a beam energy of 111 MeV. Charged particles, neutrons, and $\gamma$-rays were emitted in this reaction and detected by the DIAMANT CsI ball, Neutron Wall, and the EXOGAM Ge clover array, respectively. In addition to the previously reported levels in 91Ru, new low-to-medium spin states were observed. Angular correlation and linear polarization measurements were performed to unambiguously determine spins and parities of the excited states in 91Ru. The low-spin states of 91Ru exhibit a scheme of multi-quasiparticle excitations, which is very similar to that of the neighboring $N=47$ isotone. These excitations have been interpreted in terms of the shell model. The calculations performed in the configuration space $(p_{3/2},f_{5/2},p_{1/2},g_{9/2})$ reproduce the experimental excitation energies reasonably well, supporting the interpretation of the newly assigned positive-parity states in terms of the three quasiparticle configurations $\pi(g_{9/2})^{-2} \nu(g_{9/2})^{-1}$ and $\nu (g_{9/2})^{-3}$.

Reference (24)

/