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SUMMARY:Halo – like structure of unbound 7He
DTSTART;VALUE=DATE-TIME:20181026T123500Z
DTEND;VALUE=DATE-TIME:20181026T125000Z
DTSTAMP;VALUE=DATE-TIME:20260308T170808Z
UID:indico-contribution-1109@cern.ch
DESCRIPTION:Speakers: Alla Demyanova (NRC Kurchatov Institute)\n$^{7}$He\,
  a particle unstable nucleus is lying in the line of neutron – rich Heli
 um isotopes between $^6$He with a neutron halo and $^{8}$He having a neutr
 on skin [1]. Normally it is taken for granted that the notion “halo” c
 ould not be applied to unstable nuclei. However\, if the time of life T of
  a particular nucleus is much larger than the characteristic time τ of fl
 ight of the escaping neutron\, there is no difference between stable and u
 nstable nuclei. As for $^{7}$He the ratio T/τ ≈ 7 we looked for data wh
 ich could provide some information on the halo – like structure of $^{7}
 $He. We applied the Modified diffraction model MDM [2-4] to the charge –
  exchange reactions $^{6}$Li(t\,$^{3}$He)$^{6}$He [5] and $^{7}$Li(t\,$^3$
 He)$^{7}$He [6]. According to MDM the difference of the RMS of the states 
 under study is determined by the difference of the corresponding diffracti
 on radii taken from the differential cross-sections under study. We found 
 that the radius of $^{7}$He is R$_{rms}$ = 2.37±0.38 fm. This value is cl
 ose to those of $^{6}$He and $^{8}$He 2.48±0.03 fm and 2.52±0.03 fm [1].
  The result supports suggestion that neutrons outside $^{4}$He occupy the 
 same orbitals and indicates to smooth transition between halo and skin. Th
 e phase distributions of the fragments emitted in the reactions with stopp
 ed pions on $^{9}$Be and $^{11}$B [7\, 8] showed that the main $^{7}$He de
 cay configurations are $^{6}$He$_{gr.st}$ + n and $^{6}$He* + n confirming
  the complicated halo – like of $^{7}$He. \n\n1. I. Tanihata\, H. Savajo
 ls\, R. Kanungo\, Progress in Particle and Nuclear Physics 68\, 215 (2013)
 .\n2. A.S. Demyanova et al.\, Int. J. Mod. Phys. E 17\, 2118 (2008).\n3. A
 . N. Danilov\, T. L. Belyaeva\, A. S. Demyanova\, S. A. Goncharov\, and A.
  A Ogloblin. Phys. Rev. C 80\, 054603 (2009).\n4. A.S. Demyanova\, A.A. Og
 loblin\, S.A. Goncharov\, A.N. Danilov\, T.L. Belyaeva\, W. Trzaska\, Phys
 . Atom. Nucl.\, 80\, 831 (2017).\n5. R. H. Stokes and P. G. Young\, Phys. 
 Rev. 178 2024 (1969).\n6. J. D. Sherman et al.\, Phys. Rev. C 13\, 2122 (1
 976).\n7. M. G. Gornov et al.\, Nucl. Instrum. Meth. Phys. Res. A 446\, 46
 1 (2000).\n8. Yu. B. Gurov et al.\, Phys. Part. Nucl. 40\, 558 (2009).\n\n
 https://indico.particle.mephi.ru/event/22/contributions/1109/
LOCATION:Hotel Intourist Kolomenskoye 4* Moskvorechye 2 hall
URL:https://indico.particle.mephi.ru/event/22/contributions/1109/
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