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SUMMARY:SEARCH FOR STATES WITH ENHANCED RADII IN TRIPLET 12B-12C-12N
DTSTART;VALUE=DATE-TIME:20181022T124000Z
DTEND;VALUE=DATE-TIME:20181022T151000Z
DTSTAMP;VALUE=DATE-TIME:20260308T171933Z
UID:indico-contribution-1128@cern.ch
DESCRIPTION:Speakers: Andrey Danilov ()\nTwo independent methods: ANC (Asy
 mptotic normalization coefficients) [1\,2] and MDM (Modified diffraction m
 odel) [3\,4] were applied to new and existing experimental data. The purpo
 se of this analysis is search for states with enhanced radii in isobar-ana
 log excited states of triplet A=12: $^{12}$B – $^{12}$C – $^{12}$N.\n\
 nThere is experimental work [1] where halo was observed for 2 states of $^
 {12}$B: 2¯\, 1.67 MeV and 1¯\, 2.62 MeV. To check this result new experi
 mental data $^{11}$B(d\,p)$^{12}$B was obtained at E$_{d}$ = 21.5 MeV [5\,
 6]. On base of ANC analysis of this new data [5\,6]\, neutron halo existen
 ce was confirmed for the 2¯\, 1.67 MeV and 1¯\, 2.62 MeV states in $^{12
 }$B. An unexpected result was obtained for the unbound 3¯\, 3.39 MeV stat
 e\, which is 19 keV above the neutron emission threshold. Its halo radius 
 was also found to be increased and equal to ~ 6.5 fm [5\,6]. This result c
 an be considered as an evidence of the halo-like structure in this $^{12}$
 B state.\n\nWhat can we expect in isobar-analog states in $^{12}$C and $^{
 12}$N? Are these states also characterized by enhanced radii? To check thi
 s prediction\, preliminary analysis of existing $^{12}$C($^{3}$He\,t)$^{12
 }$N and $^{12}$C($^{3}$He\,$^{3}$He’)$^{12}$C experimental data using Mo
 dified diffraction model (MDM\, [3\,4]) was done. \n\n1.	Z. H. Liu\, Phys.
  Rev. C 64\, 034312 (2001).\n2.	T. L. Belyaeva et al.\, Phys. Rev. C 90\, 
 064610 (2014).\n3.	A.N. Danilov et al.\, Phys. Rev. C 80\, 054603 (2009)\n
 4.	A.S. Demyanova et al.\, Phys. Atom. Nucl.\, 80\, 831 (2017)\n5.	T.L. Be
 lyaeva et al.\, EPJ Web Conf.\, 165\, 01004 (2017)\n6.	T.L. Belyaeva et al
 .\, Phys. Rev. C 98\, 034602 (2018)\n\nhttps://indico.particle.mephi.ru/ev
 ent/22/contributions/1128/
LOCATION:Hotel Intourist Kolomenskoye 4* Petrovskiy hall
URL:https://indico.particle.mephi.ru/event/22/contributions/1128/
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