* On leave from FLNR / JINR, Dubna
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1 * On leave from FLNR / JINR, Dubna 1
2 Introduction: Keywords of this experimental program Search for new isotopes The limits of nuclear stability provide a key benchmark of nuclear models The context of astrophysics Production mechanism Understanding the r-process abundance patterns of elements Production cross sections, Momentum distributions, Reaction choice Secondary beam intensities. Planning new experiments, set-ups (FRIB, RIBF, FAIR) Nuclear structure Changes in the structure of neutron-rich nuclei Region around 31 Na is now known as the island of inversion Deformation around neutron number N = 40 in Fe and Cr nuclei Shell closures at N=32 and N=34 Masses of exotic calcium isotopes pin down nuclear forces ( 53,54 Ca) F. Wienholtz et al., Nature 498 (2013) 346 Evidence for a new nuclear magic number from the level structure of 54 Ca D. Steppenbeck et al., Nature 502 (2013) 207 These measurements of the Ex(2 + 1) in 54 Ca at RIKEN found that the experimental value is 0.5 MeV smaller than the prediction of the full pf shell-model space with the GXPF1B effective interaction. GXPF1B: Y. Utsuno, T. Otsuka, B. A. Brown, M. Honma, T. Mizusaki, and N. Shimizu, PRC 86, (R) (2012) ; GXPF1B5 modified GXPF1B for 0.5 MeV shift O.Tarasov@exon2014.ru 2
3 EXON 2009 : Production of new isotopes Two stage separation Production cross sections Q g - systematics O.T. et al., Phys.Rev. C 75, (2007) 44 Si T.Baumann et al.,nature (London) 449, 1022 (2007) 40 Mg, 42 Al, 43 Al 48 Ca(140MeV/u) + W,Be O.T. et al., Phys.Rev. C 75, (2007) O.Tarasov@exon2014.ru 3
4 EXON 2009 : 76 Ge (130 MeV/u) new isotopes, CS, momentum distributions Q g systematics Possible new island of inversion? 50 Cl, 53 Ar, 55,56 K, 57,58 Ca, 59,60,61 Sc, 62,63 Ti, 65,66 V, 68 Cr, 70 Mn Enhanced cross sections might be the result of increased binding This region (around 62 Ti) was previously predicted to be a new island of inversion B. A. Brown Prog. Part. Nucl. Phys. 47 (2001) 517 Phys.Rev.Lett. 102, (2009) : New isotopes, Evidence for a Change in the Nuclear Mass Surface Phys.Rev.C. 80, (2009) : Set-up, cross sections, momentum distributions NIM A 620, (2010) : A new approach to measure momentum distributions O.Tarasov@exon2014.ru 4
5 EXON 2012 : 82 Se (139 MeV/u) new isotopes, CS, momentum distributions Q g systematics Confirmation of Calcium anomaly So, what is Calcium anomaly? Reaction property or Nuclear structure feature? It should be checked with another beam 64 Ti, 67 V, 69 Cr, 72 Mn 70 Cr 1event & 75 Fe 1event N( W ) =90 N( Be )=330 N(d /dp)=126 Beam E (MeV/u) I (pna) N/Z 82 Se Ge DN / DZ=2 Confirmation of the Calcium anomaly. Without explanation O.Tarasov@exon2014.ru 5
6 2013 : Calcium anomaly as shell effects close to drip line The measured cross sections were best reproduced by using masses derived from the full pf shell-model space with the GXPF1B5 [1] effective interaction modified to a recent 54 Ca E x ( 2+ 1 ) measurement [2]. The Calcium anomaly can be explained with a shell model that predicts a subshell closure at N = 34 around Z = 20. [1] M. Honma, T. Otsuka, B. A. Brown, and T. Mizusaki, Eur. Phys. J. A 25, Suppl. 1, 499 (2005) [2] D. Steppenbeck et al., Nature 502, 207 (2013) O.Tarasov@exon2014.ru 6
7 Q g systematics, Two-neutron separation energy Experimental masses: A.T. Gallant et al., Phys. Rev. Lett. 109, (2012) F. Wienholtz et al., Nature 498 (2013) 346 O.Tarasov@exon2014.ru 7
8 Global trends of cross sections No such dump with other theoretical models 8
9 LISE ++ Abrasion-Ablation model The Abrasion-Ablation model is very sensitive to the input mass values for the most exotic nuclei. Different mass models as HFB9, HBF17, KTYU TUYY AME2003 AME2012 GXPF1B, GXPF1B5 were used in LISE ++ Abrasion-Ablation excitation energy minimization procedures to compare with the experimental data 9
10 Abrasion-Ablation: Excitation energy E The best result to describe the experimental data of isotopes of elements 16<Z<24 has been obtained with GXPF1B5 (+ LDM0) at E*=15.0 ( =9.15) MeV GSI: 40 Ar beam: <E>= 13.3 MeV NPA 531,709 (1991) 238 U beam: <E>= 27 MeV (K.H.S.) O.Tarasov@exon2014.ru 10
11 Varying masses for Abrasion-Ablation benchmarks Let s increase (decrease) 60 Ca and heavier isotopes mass excesses by 2 MeV (or decreased [increased] neutron separation energies ) O.Tarasov@exon2014.ru 11
12 Influence of de-excitation chain precedent isotopes masses on daughters production cross sections 1. Separation energy changes influence drastically of cross section close to the drip-line (this 60 Ca example ) 2. Residue cross section depends how much bound are preceding isotopes The separation energies of these isotopes have not been changed 3. Deviations in cross sections are not just indicators for local low separation energies (as 31 Ne, 37 Mg), but also might provide information about shell effects close to the neutron drip-line Expected Cross section changes O.Tarasov@exon2014.ru 12
13 Oxygen anomaly NSCL/MSU 48 Ca (140 MeV/u) + Ta O.T. et al., Phys.Rev. C 75, (2007) GANIL 36 S (75 MeV/u) + Be O.T., Thesis 1999, Phys.Lett. B 409, (1997) Oxygen isotopes are more particle bound Oxygen isotopes are less produced ? O.Tarasov@exon2014.ru 13
14 Oxygen anomaly : no particle-bound isotopes above 24 O Oxygen isotopes are more particle bound, but less produced!? No particle bound preceding isotopes of the same element, So excitation energy train cannot be slow down O.Tarasov@exon2014.ru Absence of excited bound states? 14
15 Details on Abrasion-Ablation abrasion ablation Projectile 82 Se Target 9 Be Initial prefragment 68 Ti* Final fragment 54 Ca The LISE ++ AA model is initially based on the version of J.-J.Gaimard and K.H.Schmidt, NPA531 (1991) 709 The LISE ++ AA model is analytical, that allows to calculate low cross sections of very exotic nuclei The Abrasion-Ablation approach meets three principal difficulties a. Determination of Excitation energy parameters (models) for each reaction b. Plenty of other parameters c. Suggesting negligible contribution of dissipation processes during abrasion (it can be true at high energies with light targets) Four excitation energy models are implanted in the code The Ablation step (Evaporation cascade) uses a mass table to obtain separation energies O.Tarasov@exon2014.ru 15
16 LISE ++ Abrasion-Ablation: Input channels 82 Se + Be 74 Ga * a p d t n Residual cross section is integration of the excitation function from 0 to the minimum of separation energy 1. Largest incoming contribution to the Total excitation function is 1n-channel 2. Largest incoming contribution to the Residue cross section is 1n-channel O.Tarasov@exon2014.ru 16
17 LISE ++ Abrasion-Ablation: Decay Analysis Region of interest 17
18 Output one evaporation channel / total (sum of all channels) (one scale for all plots) O.Tarasov@exon2014.ru 18
19 abrasion LISE ++ AA: Initial prefragments plot for final residue 54 Ca 82 Se + Be 76 Ge + Be ablation ablation More probable prefragments are Ti-isotopes (dz=2) O.Tarasov@exon2014.ru 19
20 Initial prefragments to produce Calcium isotopes Region of interest Calcium anomaly 20
21 68 Ti* 54 Ca First, it s Charge particle emission, Then neutron cascade Probability for 68 Ti*(Ex=180MeV) t = 2.6e-2 a = 3.6e-3 p =9.3e-3 55 Ca 54 Ca Main channel to residue Probability (dz=2) t^2 = 6.8e-4 a = 3.6e-3 p^2 =8.7e-5 It is necessary to create the MC version to gate for 54 Ca residual in order to answer where ( ** Ti **-4 Ca) de-excitation by charge particles is more probable O.Tarasov@exon2014.ru 21
22 Excitation functions A=48-68 (E * 0 = 15 MeV ) LISE ++ AA O.Tarasov@exon2014.ru 22
23 Zoom Excitation functions A=48-68 (E * 0 = 15 MeV ) Excitation energy shift O.Tarasov@exon2014.ru 23
24 De-excitation process & excitation energy of daughter nucleus: Excitation energy shift 58 Ca (0) = A 58 Ca (3.2) = B Excitation energy train : it is necessary to slow down beforehand in order to stop it on your station 1. S 1n ( 58 Ca)=3.2 MeV : (S 1n )=B is moving to E * =0 for 57 Ca excitation function 57 Ca (0) = B B 2. Let s assume S 1n ( 58 Ca)=0 MeV, then in the first rough approach : A res (0)=A is the same E * =0 for 57 Ca 57 Ca (0) ~ A 57 Ca (2.6) ~ B O.Tarasov@exon2014.ru 24
25 dbe (A=50,Z=20) Excitation energy k shifts S n (A,Z) = BE max (Z) BE (A,Z) Lets call dbe as dbe (A,Z) = BE max (Z) BE (A,Z) BE max (Z=20) BE (A=50, Z=20) O.Tarasov@exon2014.ru 25
26 Residue Cross Section of neutron-rich isotopes res dbe(z,n) dbe(z,n+1) (Z,N) = f [ dbe(z,n), S n (Z,N)] 1. (Z,N) ~ [dbe(z,n)+a 1 )] a2 * S n (Z,N) S n (Z,N) dbe(z,n) minimum separation energy difference between the maximum biding energy for isotopes (Z) and binding energy of the nucleus (Z,N) If S n (Z,N) 0, Then (Z,N) = 0, whereas Q g or BE/A systematics show unbound nuclei Or Using dbe(z,n-1) = dbe(z,n) + S n (Z,N), 2. (Z,N) ~ dbe(z,n+1) O.Tarasov@exon2014.ru 26
27 dbe Cross Section Systematic vs. Experiment 27
28 dbe Cross Section Systematic with different Mass Models vs. 82 Se Experimental Data * 10 6 * 10 5 * 10 4 * 10 3 * 10 2 * 10 1 Where d000 is GXPF1B, And d050 is GXPF1B5 O.Tarasov@exon2014.ru 28
29 Calcium anomaly observation 76 Ge 82 Se 29
30 Another representation of Anomalies 82 Se (139 MeV/u) + Be Phys. Rev. C 87, (2013) Log10 (Experimental Cross Sections / EPAX 3.15)? 74 Co lower cross section has been observed in other experiments with a 82 Se beam O.Tarasov@exon2014.ru 30
31 What is Qg systematics? Just tendency indicator 82 Se In Q gg systematics this neutron is compensated by conjugated products O.Tarasov@exon2014.ru 31
32 Production cross sections as a nucleus structure study tool 1. Even one registered event (non-zero production cross section) provides information for nucleus structure : particle bound or not 2. There are very low statistics, and spectroscopy experiments are difficult (or impossible) to perform, Systematic production cross sections can provide some indications about structure of observed isotopes, and even provide hints about structures of preceding non-observed isotopes 3. Even it is difficult to evaluate masses from AA analysis (one particular cross section kink, or depression for several isotopes), though production cross section analysis is powerful test of theoretical mass models 4. dbe-systematics advantages: a. deduced, not assumed b. start energy point c. unbound nuclei are out of the systematics d. can be used for other reaction mechanisms, where neutron rich nuclei are produced after emission large number of neutrons e. no parameters, the same slope? f. no any odd-even corrections and so on. O.Tarasov@exon2014.ru 32
33 Open questions 1. What is proper expression (parameterization) for dbe-systematics? 2. Why slopes are similar for all elements? 3. Why is turnover point is always in the dbe-place (stability line?)? 4. What is contribution of dissipation at low energies or with heavy targets 5. Can Monte Carlo study of prefragment distribution and channels preceding to final residue explain the data? New experiments will be useful as well. Discussions with Prof. D.J.Morrissey are very appreciated. 33
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