1. NEUTRINO INTERACTION WITH NUCLEI
S.V. Semenov
National Research Centre "Kurchatov Institute“
II International Workshop
“SN 1987A, Quark Phase Transition in Compact Objects and Multimessenger Astronomy"
BNO and SAO

2. Neutral current interaction Astrophysical applications:
Charged current interaction
Neutral current interaction
Astrophysical applications:
R – processes during nucleosynthesis
Synthesis of number of elements ,11В, 19F during SN explosion
Detection of SN neutrino

3. ne interactions in LSD detector
ne + 12C 12Ngs + e CC
ne + 12C  12N* + e CC
ne + 12C  12C*(15.1 MeV) + ne’ NC
ne + 56Fe  56Co* + e CC
ne + 56Fe  56Fe* + ne’ NC

4. V.S. Imshennik and O.G. Ryazhskaya, Astron. Lett. V.30, P.14 (2004)
Reliable calculations of cross sections are of great significance

5. The problem of nuclear matrix elements calculation
Experimental data are necessary for the test of NME calculation methods
Till now two experiments have been performed, where direct measurements of neutrino-nuclei reaction cross section had been carried out.

6. KARMEN μ DAR B. Zenitz, Progr. Part. Nucl. Phys. , V. 32, P
KARMEN μ DAR B. Zenitz, Progr. Part. Nucl. Phys., V.32, P.351 (1994); Phys. Lett. B, v. 267, p. 321 (1991); v. 423, p.15 (1998) LSND μ DAR and DIF D.A. Krakauer et al, Phys. Rev. C v.45, p (1992) LSND Collab., Nucl. Phys. A, v. 629, p. 531c (1998) Experiments have been accomplished with 12C и 56Fe

7. +, + DAR, Decay At Rest:
+ + + , =26 нс, МэВ
=2.2мкс,

8. Spectra of and neutrino, + DAR

9. Interaction of ne, with 12C
KARMEN Collaboration, Phys. Lett. B 267, 321 (1991)
First observation of the neutral current nuclear excitation
12C(,’) 12C(1+,1;15.1 MeV)
KARMEN Collaboration, Phys. Lett. B 332, 251 (1994)

10. Interaction of n с 12C
KARMEN Collaboration, Phys. Lett. B 423, 15 (1998)
Measurement of the weak neutral current excitation
NC=(3.20.5)· см2

11. Interaction of ne with 56Fe
R. MASCHUW for the KARMEN Collaboration,
Progr. Part. Nucl. Phys., 40, 183 (1998)
Neutrino Spectroscopy with KARMEN
СС ne + 56Fe  56Co* + e-
<(56Fe(e,e-)56Co)>=[2.51 0.83(stat)0.42(syst)]·10-42 cм2
NC ne + 56Fe  56Fe* + ne’
<(56Fe(e,e’)56Fe*)>=?

12.  Charged channel Neutral channel
Yu.V. Gaponov, O.G. Ryazhsksya, S.V. Semenov,
Physics of Atomic Nuclei, 67,1969 (2004)
Neutral channel 
O.G. Ryazhskaya, S.V. Semenov, Int. Workshop, “Quark Phase Transitions in Compact Objects and Multimessenger Astronomy”, SAO and BNO, 2015, p.105

13. Charged channel
Neutral channel

14. Interaction cross section
Charged channel
Excitation of analog 0+ (АR ) и Gamov-Teller 1+ (GТR) gigantic resonances in 56Со

15. gA=1.27
- Energy difference between initial and final nuclear states
For the from ground state transitions

16. Determination of
from the experimental data on the strength distribution of the
dipole M1 transitions in 56Fe nucleus

18. Ex, кэВ J=1+ , мэВ B(M1) T.Shizuma, T. Hayakawa, H. Ohgaki et al,
Dipole strength distribution in 56Fe
Phys. Rev. C, 87, (2013)
Ex, кэВ J=1+
, мэВ
B(M1)
3448.6
7166
7211.1
7249.4
7467.6
7887.6
8119.6
8652.5
8879.3
8908.9
8963.6
8988.9
9107.8
9312.2
9402.0
9434.9
9554.8
9622.9
9664.7
9768.2 78
175
614
219
260
396
391
403
402
647
454
639
838
869
1305
313
680
473
429
336
0.49
0.124
0.425
0.149
0.162
0.210
0.190,
0.24,
0.164
0.229
0.288
0.280
0.408
0.097
0.203
0.138
0.123
0.094

19. T. Shizuma, T. Hayakawa, H. Ohgaki et al, Fine structure of the magnetic-dipole-strength distribution in 208Pb Phys. Rev. C 78, (R) (2008)
Ex, кэВ J=1+
, мэВ
B(M1)
7178.1
7209.5
7246.4
7280.6
7299.8
7322.3
7346.8
1500
1400
2200
3200
2800
1000
2500
510 2
0.97
1.5
2.2
1.9
0.68
1.6
0.38

20. Kohler R., Wartena J.A., Weigmann H. et al. // Phys. Rev. C. 1987. V. 35. P. 1646.
By the examination of resonance structure of 207Pb + n system the total magnetic dipole strength in the energy domain beyond the neutron separation energy up to 8.7 MeV have been determined, which equals

22. + DAR neutrino spectrum
12C KARMEN experiment
56Fe
208Pb
S.V. Semenov, Bulletin of Russian Academy of Sciences, Physics, Vol. 81, p. 810

23. Conclusion
Cross section of neutrino-nuclei neutral current interaction comprises a noticeable part of total cross section. It is necessary totake into account these processes by the consideration of primary nucleosynthesis and for the theory of neutrino detectors development.
The investigation of nuclear resonance fluorescence gives the possibility to determine nuclear matrix elements, necessary for cross section calculations.
The use of neutron rich nuclei is an essential element of effective neutrino detectors construction

24. Работа поддержана грантами РФФИ
офи-м ,
Спасибо за внимание!