Quantum tunnel effect and alpha-decay of nuclei Zhongzhou REN Department of Physics, Nanjing University, Nanjing, China Center of Theoretical Nuclear Physics National Laboratory of Heavy -lon Accelerator, Lanzhou, china
1 Quantum tunnel effect and alpha-decay of nuclei Zhongzhou REN • Department of Physics, Nanjing University, Nanjing, China • Center of Theoretical Nuclear Physics, National Laboratory of Heavy-Ion Accelerator, Lanzhou, China
Outline Introduction Microscopic calculations on superheavy nuclei Spherical generalized density-dependent cluster model Deformed generalized density-dependent cluster model Summary
2 Outline • Introduction • Microscopic calculations on superheavy nuclei • Spherical generalized density-dependent cluster model • Deformed generalized density-dependent cluster model • Summary
Alpha of nuclear physics: 1896-1930 Discovery of radioactivity: Becquere Identify Po and Ra by Curies.1903年。 Alpha, Beta, gamma rays: Rutherford Existence of nucleus by alpha scattering The size of nucleus by alpha scattering Quantum mechanics for alpha decay Gamow,前苏联一丹麦-美国
3 Alpha of nuclear physics: 1896-1930 • Discovery of radioactivity: Becquere. • Identify Po and Ra by Curies. 1903…年。 • Alpha, Beta, gamma rays: Rutherford. • Existence of nucleus by alpha scattering • The size of nucleus by alpha scattering • Quantum mechanics for alpha decay: Gamow, 前苏联—丹麦---美国
Introduction Proton radioactivity(2251) The study on a decay dates back to the early Alpha decay(2252 days of nuclear physics. It although one of the oldest Cluster radioactivity (2287) objects of study in nuclear Spontaneous fission(Z 290) p hysics, remains an attractive decay mode 238 90
4 Introduction Proton radioactivity (Z≥51) Alpha decay (Z≥52) Cluster radioactivity (Z≥87) Spontaneous fission (Z ≥90) The study on α decay dates back to the early days of nuclear physics. It, although one of the oldest objects of study in nuclear physics, remains an attractive decay mode
There are more than 400 nuclei in the periodic table that exhibit the alpha-decay phenomenon ■ 102030405060708090100110120130140150160170 NE∪ TRONS 100 R DECAY MODES T □βEC+et) β Internal Transition S □ Spontaneous Fission Stable nuclide □ Unknown decay
5 There are more than 400 nuclei in the periodic table that exhibit the alpha-decay phenomenon
It has been used as a reliable way to identify new synthesized elements and isomeric states ■ CHART OF THE NUCLIDES 8Ca+238U. 249Cf Z=114 99t 108 176178180182184 164166168170172174 112285 9151
6 neutron number 111 112 113 114 117 115 118 116 160 162 164 166 168 170 172 174 176 178 180 182 184 152 154 156 158 Mt 266 Db 262 Db 263 Sg 266 Db 256 Db 257 Db 258 Db 260 Rf 255 Rf 256 Rf 258 Rf 259 Rf 260 Rf 261 Rf 262 Rf 263 Bh 261 Bh 262 Rf 257 Db 261 Sg 259 Sg 260 Sg 261 Sg 263 Bh 264 B h H s D s Sg 258 Lr 259 No 258 Lr 260 No 259 Lr 261 Lr 262 No 260 No 262 Lr 258 No 257 Lr 255 No 254 Lr 254 No 253 Lr 257 No 256 Lr 256 No 255 Md 257 Fm 256 Md 258 Fm 257 Md 259 Md 260 Fm 258 Fm 259 Md 256 Fm 255 Md 253 Fm 252 Md 252 Fm 251 Md 255 Fm 254 Md 254 Fm 253 Es 250 Es 251 Es 252 Es 253 Es 254 Es 255 Es 256 Cf 249 Cf 250 Cf 251 Cf 252 Cf 253 Cf 254 Cf 255 Cf 256 110/271 110/273 111/272 CHART OF THE NUCLIDES No Md Fm Es C fproton number 150 D b Rf L r N o M d F m E s Cf Z = 114 10 8 Hs 264 Hs 265 Hs 267 a a a a a a 110/270 Hs 266 Sg 262 112/285 9.15 39 s Z/A T1/2 E (MeV) 110/269 Mt 268 EC - SF 112/277 110/267 M t Hs 269 Hs 270 Sg 265 S g a a a a a a a a a a a a a a a a a a a a a 108/275 110/279 106/271 112/282 112/284 114/286 114/287 10.01 114/288 9.95 116/290 115/287 115/288 113/283 113/284 111/280 109/276 107/272 111/279 109/2 57 116/291 10.85 10.74 112/285 110/281 114/289 9.82 9.54 9.16 9.30 8.53 10.00 10.59 10.46 10.12 9.75 9.71 9.02 10.37 10.33 105/268 15 ms 32 ms 87 m s 6.3 m s 0.1 s 0.15 s 0.17 s 0.72 s 9.8 s 16 h 9.7 m s 0.48 s 0.5 m s 0.1 s 3.6 s 0.18 s 2.4 m in 9.6 s 34 s 0.16 s 0.56 s 0.63 s 2.7 s 10.20 112/283 4.0 s a 116/292 10.66 16 ms 107/2 17 116/293 53 ms 1.8 ms 118/294 11.65 105/267 1.2 h 10.53 9.70 104/267 104/268 2.3 h 48 238 249 Ca + U.... Cf 208 50 70 Pb + Ti.... Zn It has been used as a reliable way to identify new synthesized elements and isomeric states
It provides new information on the variety of shapes(.e, shape coexistence) 15 20 10 阝,cos(Y+30)
7 It provides new information on the variety of shapes (i.e., shape coexistence)
Talk toady: 2 students Begin researches in 4th year (undergraduate) Then become graduate student in my group One: 3.5 year for Ph D. Then assoc Prof. in 2008(Chang XU Another: second year(Dongdong Ni)
8 Talk toady: 2 students. • Begin researches in 4th year (undergraduate) • Then become graduate student in my group • One: 3.5 year for Ph. D. Then assoc. Prof. in 2008 (Chang XU). • Another: second year (Dongdong Ni)
List of Publications(Second: 1+1) (D Ni,Z Ren et al. Phys. Rev. C,044310 2008 (2)D Ni and z Ren Eur. Phys. J.A 38, 251(2008 (3)D Ni, L Wei, Z Ren Commun. Theor. Phys. 51, 713 2009. (4)D Ni and z Ren Nucl. Phys. A 825, 145 2009. 5)D Ni and z Ren Nucl. Phys. A 828, 348 (2009). (6)D Ni and Z Ren Phys. Rev. C, 014314(2009). (7D. Ni and Z Ren Phys. Rev. C 80, 051303(R)(2009)
9 List of Publications (Second:1+1) (1) D. Ni, Z. Ren et al. Phys. Rev. C 78, 044310 (2008). (2) D. Ni and Z. Ren Eur. Phys. J. A 38, 251 (2008). (3) D. Ni, L. Wei, Z. Ren Commun. Theor. Phys. 51, 713 (2009). (4) D. Ni and Z. Ren Nucl. Phys. A 825, 145 (2009). (5) D. Ni and Z. Ren Nucl. Phys. A 828, 348 (2009). (6) D. Ni and Z. Ren Phys. Rev. C 80, 014314 (2009). (7) D. Ni and Z. Ren Phys. Rev. C 80, 051303(R) (2009)
Nuclear physics: bright future First student: strong with other field Second student: also strong Third:澳门科技大学,因我推荐核物理 assistant professor, high salary Tiekuang Dong All in Nanjing now( Texas, Macao,圣诞) 10
10 Nuclear physics: bright future • First student: strong with other field. • Second student: also strong • Third: 澳门科技大学, 因我推荐核物理. • assistant professor, high salary. • Tiekuang Dong • All in Nanjing now( Texas, Macao,圣诞)
