study of 7 be relativistic fragmentation in nuclear track emulsion
DESCRIPTION
Study of 7 Be relativistic fragmentation in nuclear track emulsion. Denis Artemenkov, VBLHE, JINR ( for the BECQUEREL collaboration ). BECQUEREL at the JINR Nuclotron is devoted systematic exploration of clustering features of light stable and radioactive nuclei. - PowerPoint PPT PresentationTRANSCRIPT
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Study of 7Be relativistic fragmentation in
nuclear track emulsion
Denis Artemenkov,
VBLHE, JINR (for the BECQUEREL collaboration)
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BECQUEREL at the JINR Nuclotron is devoted systematic exploration of clustering features of light stable and radioactive nuclei.
The fragmentation of a large variety of light nuclei was investigated using the emulsions exposed to few A GeV nuclear beams at JINR Nuclotron. A nuclear track emulsion is used to explore the fragmentation of the relativistic nuclei.
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Study of relativistic 7Be fragmentation in nuclear track emulsion in JINR
7Li7Be (charge exchange, at 1.2 A GeV)
2004
Relativistic fragments
Target fragments
Event number
2He nb=0
nb>0
95
79
He+2H nb=0
nb>0
52
78
4H nb=0
nb>0
14
16
Li+H nb=0
nb>0
3
38
Total nb=0
nb>0
164
211
12C7Be (in mixed beam of 12N+10C+7Be at 1.2 A GeV)
2006
Table 1. Charge composition of the fragments in events with Q=4
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Ion Physics Electromagnetic Dissociation
• Electromagnetic dissociation is liberation of nucleons or nuclear fragments as a result of electromagnetic field by exchange of virtual photons, rather than the strong nuclear force
• It is important for relativistic nuclear-nuclear interaction, especially where the proton number of the nucleus is large
• G4EMDissociation model and cross section are an implementation of the NUCFRG2 (NASA TP 3533) physics and treats this electromagnetic dissociation (ED).
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G4EMDissociationG4EMDissociationCrossSection
Started: 3000 of 7Be nuclei at 1.2 A GeVProduced: 7 events of 7Be6Be+n;
Data modeling of 7Be EM dissociation at 1.2 A GeV
6BeAtomic Mass: 6.0197258 0.0000059 amuExcess Mass: 18374.465 5.468 keVBinding Energy: 26924.058 5.468 keVSpin: 0+Half life: 92 keV (5.010-6 fs)Mode of decay: 2 Proton to He-4Decay energy: 1.372 MeV
http://atom.kaeri.re.kr
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7Be
He
H
H
7BeHe+2H
7Be6Be+n4He+21H+n
?7Be
6Be
n
4He
p
p
n
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pHepHepHemmMQ 2444 22
pHepHepHe
mmMQ 444
ppHepLiBeBe 4567
6Ве 5Li
12C7Be (in mixed beam of 12N+10C+7Be at 1.2 A GeV), 2006
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7Be2He
7Li7Be (charge exchange, at 1.2 A GeV) 2004
7BeHe
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MeVmmMQHeHeHeHeHeHe
59,1343434
12C7Be (in mixed beam of 12N+10C+7Be at 1.2 A GeV)
2006
7Li7Be (charge exchange, at 1.2 A GeV)
2004
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2
3
1
3
120 17.1
itti AARW
λexp=14,2 ± 0,2 cm(our experiment)
Mean free path λinel
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Summary
• The possibilities of nuclear track emulsion for study of fragmentation of relativistic light nuclei is shown.
• The production of unstable 6Be in electromagnetic interactions of 7Be with emulsions nuclei is discussed.
• The most probable channels for 7Be fragmentation are overviewed.
Thank you for your attention!
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http://becquerel.jinr.ru/http://becquerel.jinr.ru/