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SUMMARY:Highlights from the  rst transfer experiment at GANIL with ACTAR
  TPC
DTSTART;VALUE=DATE-TIME:20240529T070000Z
DTEND;VALUE=DATE-TIME:20240529T073000Z
DTSTAMP;VALUE=DATE-TIME:20260716T015526Z
UID:indico-contribution-23778@indico.ific.uv.es
DESCRIPTION:Speakers: B. Fernández-Domínguez (IGFAE/Universidade de Sant
 iago de Compostela\,)\nDirect reactions are fundamental tools to investiga
 te the structure of exotic nuclei. Stud-\nies of nuclei far away from stab
 ility are usually performed with secondary radioactive beams\,\nthat su 
 er from low intensities and need to be compensated with thick targets and 
 high\ne cient detection systems to increase luminosity. Active targets a
 re invaluable devices that\,\namong other important features\, allow to re
 construct the reaction in three dimensions with-\nout loss of resolution.\
 nThe ACtive TArget and Time Projection Chamber (ACTAR TPC) detector [1\,3]
  has been\ndeveloped at GANIL to cover a broad physics programme. The devi
 ce was commissioned in\n2018 showing an excellent performance of the detec
 tor [4]. Since then\, several experiments\nhave been performed at GANIL. I
 n this talk\, I will present the results from the single-proton\nremoval r
 eaction 20O(d\,3He)19N which aimed at probing the Z=6 shell gap towards th
 e\nneutron dripline. From all the magic numbers that emerge as a consequen
 ce of the spin-\norbit splitting\, the gaps at 6 and 14\, were already con
 sidered by Goepper-Mayer and Jensen\nas very weak [5]. However\, experimen
 tal results published in Nature [6] showed evidence for\na Z=6 shell closu
 re. A (p\,2p) experiment [7] was performed later and supports a moderate\n
 reduction of the 1p1=2 and 1p3=2 splitting. Yet not direct measurement of 
 the gap has been\nobtained so far.\nThe goal of the 20O(d\,3He)19N [8] exp
 eriment at GANIL is twofold: First\, the experiment\nwill provide a unique
  way of determining the gap between the 1p1=2 and 1p3=2 single-particle\ns
 tates in 19N and will bring crucial information on the Z=6 shell gap. Seco
 nd\, this experiment\nis the  rst transfer experiment with the new gener
 ation of active targets. Originally\, these\ntransfer experiments required
  the use of complex arrays for particle and gamma detection\nsystems to im
 prove selectivity. The use of active targets overcomes the aforementioned\
 ndi culties and is specially well adapted to explore new regions of the 
 nuclear chart with\nunprecedented resolution using a much more compact det
 ection system.\nReferences\n[1] T. Roger et al. Nucl. Instrum. Meth. Phys.
  Res. A 895\, 126 (2018).\n[2] J. Pancin et al. Nucl. Instrum. Meth. Phys.
  Res. A 735\, 532 (2014).\n[3] P. Konczykowski et al.\, Nucl. Instrum. Met
 h. Phys. Res. A 927\, 125 (2019).\n[4] B. Mauss et al. Nucl. Instrum. Meth
 . Phys. Res. A 940\, 498 (2019).\n[5] M. Goeppert Mayer\, Nobel Lectures\,
  Physics\, 2037 (1963).\n[6] D. T. Tran\, H. J. Ong et al.\, Nature commun
 ications 9 (2018) 1594\n[7] I. Syndikus et al.\, Phys. Lett. B 809 (2020) 
 135748\n[8] J. Lois-Fuentes\, Ph. D. USC (2023)\n\nhttps://indico.ific.uv.
 es/event/7332/contributions/23778/
LOCATION:ADEIT - Valencia
URL:https://indico.ific.uv.es/event/7332/contributions/23778/
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