Year: 2012
Type: article
Abstract: Excited states in $^{38,40,42}\mathrm{Si}$ nuclei have been studied via in-beam $\ensuremath{\gamma}$-ray spectroscopy with multinucleon removal reactions. Intense radioactive beams of $^{40}\mathrm{S}$ and $^{44}\mathrm{S}$ provided at the new facility of the RIKEN Radioactive Isotope Beam Factory enabled $\ensuremath{\gamma}\mathrm{\text{\ensuremath{-}}}\ensuremath{\gamma}$ coincidence measurements. A prominent $\ensuremath{\gamma}$ line observed with an energy of 742(8) keV in $^{42}\mathrm{Si}$ confirms the ${2}^{+}$ state reported in an earlier study. Among the $\ensuremath{\gamma}$ lines observed in coincidence with the ${2}^{+}\ensuremath{\rightarrow}{0}^{+}$ transition, the most probable candidate for the transition from the yrast ${4}^{+}$ state was identified, leading to a ${4}_{1}^{+}$ energy of 2173(14) keV. The energy ratio of 2.93(5) between the ${2}_{1}^{+}$ and ${4}_{1}^{+}$ states indicates well-developed deformation in $^{42}\mathrm{Si}$ at $N=28$ and $Z=14$. Also for $^{38,40}\mathrm{Si}$ energy ratios with values of 2.09(5) and 2.56(5) were obtained. Together with the ratio for $^{42}\mathrm{Si}$, the results show a rapid deformation development of Si isotopes from $N=24$ to $N=28$.
Source: Physical Review Letters
Authors: S. Takeuchi, M. Matsushita, N. Aoi, P. Doornenbal, K. Li, T. Motobayashi, H. Scheit, D. Steppenbeck, H. Wang, H. Baba, D. Bazin, L. Càceres, H. Crawford, P. Fallon, R. Gernhäuser, J. Gibelin, S. Go, S. Grévy, C. Hinke, C. R. Hoffman, R. Hughes, E. Ideguchi, D. Jenkins, N. Kobayashi, Y. Kondo, R. Krücken, T. Le Bleis, J. Lee, G. Lee, A. Matta, S. Michimasa, T. Nakamura, S. Ota, M. Petri, T. Sako, H. Sakurai, S. Shimoura, K. Steiger, K. Takahashi, M. Takechi, Y. Togano, R. Winkler, K. Yoneda
Institutions: RIKEN, RIKEN Nishina Center, Rikkyo University, The University of Tokyo, The University of Osaka, Peking University, Technische Universität Darmstadt, National Superconducting Cyclotron Laboratory, Michigan State University, Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Institut National de Physique Nucléaire et de Physique des Particules, Grand Accélérateur National d'Ions Lourds, Lawrence Berkeley National Laboratory, Technical University of Munich, École Nationale Supérieure d'Ingénieurs de Caen, Laboratoire de Physique Corpusculaire de Caen, Université de Caen Normandie, Argonne National Laboratory, University of Richmond, University of York, Tokyo Institute of Technology, TRIUMF, Goethe University Frankfurt, GSI Helmholtz Centre for Heavy Ion Research, Université Paris-Sud, Los Alamos National Laboratory
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G102163711, G1286236842, G1720871899, G2387522751, G262962599, G3083819904, Study of unbound nucleonic systems using breakup reactions of unstable nuclei, Formation mechanism of magic numbers in unstable nuclei, G3479632140, Determination of stellar reaction cross sections relevant to p-nuclei synthesis by using fast radioactive isotope beam, G3685081974, G42916606, mass measurements of neutron-rich oxygen isotopes, G6848031779, G7115012554, G969889393
OpenAlex ID: W1501927092