SAIP2026

Testing the vibrational nature of 100Ru.

9 Jul 2026, 09:50

20m

Lecture Hall GH2 (University of the Western Cape)

Oral Presentation Track B - Nuclear, Particle and Radiation Physics Nuclear, Particle and Radiation Physics -1

Speaker

Lwazikazi Maqungo (UWC)

Description

There is renewed interest in the exploration of the nature of low-lying collective excitations in nuclei, as several recent studies have posed serious ques tions regarding the veracity of multiphonon quadrupole vibrations [1, 2]. A recent survey of nuclei with previously assumed low-lying spherical vibrational structure showed that very few passed the criteria [3]. Of the few remaining candidates there is insufficient spectroscopic information to draw conclusions. As part of a larger strategy to address this issue, the structure of 100Ru was studied in this work, making use of the 103Rh(p, α)100Ru reaction. The experiment was performed using the high resolution Q3D magnetic spectrograph in Garching, Germany [4, 5]. The angular distributions of measured cross sections were compared with distorted wave Born approximation (DWBA) calculations. This spectroscopic analysis was used to probe the structure of 100Ru, and indicate that this particular case also does not convincingly demonstrate spherical vibrational behavior.

References
[1] P. E. Garrett, K. L. Green, and J. L. Wood. “Breakdown of vibrational
motion in the isotopes 110−116Cd”. Physical Review C—Nuclear Physics, 78
(4):044307, 2008.

[2] P. E. Garrett and J. L. Wood. “On the robustness of surface vibrational modes: case studies in the Cd region”. Journal of Physics G: Nuclear and Particle Physics, 37(6):064028, 2010.

[3] J. Kern, P. E. Garrett, J. Jolie, et al. “Search for nuclei exhibiting the U(5) dynamical symmetry”. Nuclear Physics A, 593(1):21–47, 1995.

[4] M. L¨offler, H. J. Scheerer, and H. Vonach. “The ion optical properties of the Munich Q3D-spectrograph investigated by means of a special experimental ray tracing method”. Nuclear Instruments and Methods, 111(1):1–12, 1973.

[5] H. F. Wirth, H. Angerer, T. Von Egidy, et al. “New Q3D focal plane
detector with cathode-strip readout became operational”. Maier-Leibnitz-
Laboratorium Jahresbericht, 71, 2000