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SUMMARY:Neutron-proton pairing in the self-conjugate nuclei of the  f-shel
 l through two-nucleon transfer reactions
DTSTART;VALUE=DATE-TIME:20231203T065500Z
DTEND;VALUE=DATE-TIME:20231203T072000Z
DTSTAMP;VALUE=DATE-TIME:20260811T114513Z
UID:indico-contribution-3337@indico.tlabs.ac.za
DESCRIPTION:Speakers: Marlène Assié (IJCLab)\nNeutron-proton pairing is 
 the only pairing that can occur in the T=0 and the T=1 isospin channels. T
 =1 particle-like pairing (n-n or p-p) has been extensively studied unlike 
 T=0 neutron-proton pairing. The over-binding of N=Z nuclei could be one of
  its manifestation.\n	Neutron-proton pairing can be studied by spectroscop
 y as in ref.[1].We have here studied it through transfer reactions in orde
 r to get more insight into the relative intensities of the two aforementio
 ned channels. Indeed\, the cross-section of np pair transfer is expected t
 o be enhanced if the number of pairs contributing to the populated channel
  is important. The observable of interest is the ratio of the two-nucleon 
 transfer cross-sections to the lowest 0+ and 1+ states. \n	Neutron-proton 
 pairing is predicted to be more important in N=Z nuclei with high J orbita
 ls so that the best nuclei would belong to the g9/2 shell [2]. However\, c
 onsidering the beam intensities in this region\, we have focussed on fp-sh
 ell nuclei.\n	Measurements of the two-nucleon transfer reaction (p\,3He) w
 ere performed at GANIL with three radioactive beams produced by fragmentat
 ion and purified by the LISE spectrometer: 56Ni\, 52Fe\, 48Cr. The set-ups
  were based on the coupling of the MUST2 Silicon array for charged particl
 e detection with the EXOGAM gamma-ray array and a zero-degree detection (Z
 DD) for the last experiment.\n	The two first measurements with 52Fe (N=Z=2
 6) beam\, which is a partially occupied 0f7/2 shell nucleus and 56Ni (N=Z=
 28) beam\, which has a fully occupied 0f7/2 shell allowed us to study np p
 airing according to shell occupancy [2]. The last measurement with 48Cr be
 am will allow to study the interplay between np pairing and deformation.\n
 	I will present the cross-sections measured in both channels (T=0 and T=1)
  and discuss the consequence for each pairing channel. The aforementioned 
 ratio of cross-sections and the angular distribution for the ground state 
 of 54Co will be compared with DWBA calculations. Preliminary results for 4
 8Cr(p\,3He) will also be presented.\n\n\n\n\n[1] B. Cederwall et al\, Natu
 re 469 (2011) 469.\n[2] B. Le Crom\, M. Assié et al\, Phys. Lett. B 829 (
 2022) 137057.\n\nhttps://indico.tlabs.ac.za/event/119/contributions/3337/
LOCATION:
URL:https://indico.tlabs.ac.za/event/119/contributions/3337/
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