大學課件psd殼層滴線核性質的殼模型研究豐質子核的結構

1、psd殼層滴線核性質的殼模型研究 -豐質子核的結構輕核的組態(tài)問題 (17ne為例)唯象計算可能的微觀研究11be, 14b, 17c, 19c etc.11be, 14b, 17c, 19c etc.exotic phenomena in psd shell nuclei6he, 11li, 14be, 17b etc.6he, 11li, 14be, 17b etc.common features:loosely bounds or p wave valence nucleonsh. simon et al, prl 83, 496 (1999)11 11li liproton halo?

2、8b (1p8b (1p1/21/2, , =138kev) : probably not=138kev) : probably not 17f17f* * (2s (2s1/2,1/2, , =105kev ): yes=105kev ): yes 17ne(17ne( 2p2p=940kev ) : unknown=940kev ) : unknownconfiguration : unknownconfiguration : unknownm. chromik et al, prc66, 024313(2002)17ne: dependent on the configuration o

3、f the valence proton pairl.v. grigorenko, prc71 71, 051604(r) (2005) shell model calculations may be helpfulshell-model description: heff=php+phqp : model space (psd shell)q : excluded space (1s+fp+) : wave operatorrealistic hamiltonianmk, wbtmicroscopic hamiltoniancd-bonn. +unitary transformationpr

4、oblems of the microscopic approach:model space with a core model space with a core (with core polarization effect):numerically not feasible for non-degenerate systemsno core shell model no core shell model (no hole state):dependent on h dependent on h and the space;convergence problemproblems of the

5、 realistic hamiltonian:problems of the realistic hamiltonian:1) constructed from stable nucleistill valid for drip line nuclei?2) truncations (0+1 h h for mk)effect of intruder states becoming important at drip lines. shimoura et al, plb 654, 87 (2007)intruderh. simon et al, prl 83, 496 (1999)11li11

6、li3) sensitive to effective operators 4) shell gap?5)charge breaking effectisospin symmetry (mirror symmetry)breaking effect2s1/2one bodytwo bodyimproved realistic hamlitonian (wb*) wbt (wbt (for ppp-sd) + usdb () + usdb (for sd); ); reduced shell gap to fit low-lying states of reduced shell gap to

7、fit low-lying states of 13c-13n13c-13n ; ; charge breaking effect;charge breaking effect;coulomb + csb strong force (from cd-bonn) +thomas-ehrman shift renormalization effect of h renormalization effect of h -nonconserving interaction interactione.g., pp-sd com correction (the method of lawson)13cco

8、nstruction of the many-body hamiltion;lanczos diagonalization - further applications? calculation (1) wb* in 0-3h psd spacewbt and mk in 0+1 h psd spaceparallel shell-model code + pku clustermk:wbt:calculations (2)improved performance for em propertiescalculations (3)17 17nene15ospectral description

9、 not so good (effect of h effect of h -nonconserving interaction ? interaction ?)experimentcalculations (4)configurations of the valence proton pair in 17ne: sensitive to the thomas-ehrman shift !3/2-g.s.g.s.beta-decay analysis : the state should have 50% more 1s1/2 component than that of 17n.d.j. m

10、illener, prc,55, r1633 (1997).calculations (5)further charge-breaking effect?understoodunderstoodk.i. hahn et al, prc54, 1999(1996)3+?3+wbwb* *critical role played by the csb effecttts kuo,prl 78 (2708)1997k ogawa, plb 464(157)1999origins?summary psd shell model calculations on 17ne; the thomas-ehrm

11、an shift can enhance the 1s2 component of the valence proton pair; an example with strong coulomb effect on the configuration; microscopic origin of the thomas-ehrman shift and the csb effect? tts kuo,prl 78 (2708)1997k ogawa, plb 464(157)1999知其所以然？ no-core shell model lee-suzukilee-suzuki transform

12、ation to the shell model basis (no hole state) (no hole state)t. dytrych et al, prl, 98, 162503 (2007)0h +2h correction2h two step unitary transformation?core nucleons+ valence nucleons + 2h core nucleons+ valence nucleons + 2h corection core : no hole state + mean field potential for the single particle energy? 0+2 2h 2h : to heavier nuclei?step: 1) unitary transformation in