Computational Challenges in Nuclear and Many-­Body Physics

Nuclear charge radii of exotic nuclei and superheavy nuclei from the experimental decay data

Not scheduled

1m

132:028 (Nordita, Stockholm)

Speaker

Prof. Zhongzhou REN (Nanjing University)

Description

One of fundamental properties of a nucleus is its radius [1,2]. Experimental information on nuclear charge radii can be obtained by different sources such as electron scattering, muonic atom spectra, isotope shifts, and so on [2,3]. These methods are successful for the nuclei near the beta-stability line. However, it is difficult for them to obtain charge radii of exotic nuclei and superheavy nuclei, because these nuclei are produced by experiments and exhibit short lifetimes so that they are not available as target nuclei. In view of this, we propose a method to determine nuclear charge radii from the decay data [4-8]. As we all know, alpha decay is the main decay mode of heavy and superheavy nuclei [4-6]. We extract their charge radii from the experimental alpha-decay data by the aid of the well-established alpha-decay model [8]. The charge distribution of daughter nuclei is determined in the double-folding model to reproduce the experimental $\alpha$-decay half-lives. The root-mean-square (rms) charge radius is then calculated using the resulting charge distribution. Nuclear radii of heavy and superheavy nuclei with Z=98-116 are extracted from the alpha-decay data [6-8], for which alpha decay is an unique tool to probe nuclear sizes at present. This is the first result on nuclear charge radii of superheavy nuclei based on the experimental alpha-decay data. Moreover, the rms charge radii of some medium-mass proton-rich nuclei and light neutron-rich nuclei are separately extracted from the experimental data of proton emission and cluster radioactivity in a similar manner [6-8]. References [1] R. Hofstadter, Rev. Mod. Phys. 28, 214 (1956). [2] I. Angeli and K. P. Marinova, At. Data Nucl. Data Tables 99, 69 (2013). [3] Z. Wang and Z. Ren, Phys. Rev. C 70, 034303 (2004). [4] Yu. Ts. Oganessian, J Phys. G: Nucl. Part. Phys. bf 34, R165 (2007). [5] R.G. Lovas, R.J. Liotta, A. Insolia, K. Varga, and D.S. Delion, Phys. Rep. 294, 265 (1998). [6] D. Ni, Z. Ren, T. Dong, and Y. Qian, Phys. Rev. C 87, 024310 (2013). [7] Y. Qian, Z. Ren, and D. Ni, Phys. Rev. C 87, 054323 (2013). [8] D. Ni and Z. Ren, Phys. Rev. C 80 051303(R) (2009); Phys. Rev. C 81, 024315 (2010).