WFRF:(Emling H.)
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Coulomb breakup of neutron-rich Na-29,Na-30 isotopes near the island of inversion
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- Rahaman, A. (author)
- Saha Institute of Nuclear Physics
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- Datta, U. (author)
- Helmholtz Zentrum,Helmholtz Center,Saha Institute of Nuclear Physics
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- Aumann, T. (author)
- Technische Universität Darmstadt,Helmholtz Zentrum,Helmholtz Center
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- Kalantar-Nayestanaki, N. (author)
- Najafi, M. A. (author)
- Rigollet, C. (author)
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- (creator_code:org_t)
- 2017-02-21
- 2017
- English.
- In: Journal of Physics G: Nuclear and Particle Physics. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 44:4, s. 045101-
- Journal article (peer-reviewed)
Abstract
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- First results are reported on the ground state configurations of the neutron-rich Na-29,Na-30 isotopes, obtained via Coulomb dissociation (CD) measurements. The invariant mass spectra of these nuclei have been obtained through measurement of the four-momenta of all decay products after Coulomb excitation of those nuclei on a Pb-208 target at energies of 400-430 MeV/nucleon using the FRS-ALADIN-LAND setup at GSI, Darmstadt. Integrated inclusive CD cross-sections (CD) of 89 (7) mb and 167 (13) mb for one neutron removal from Na-29 and Na-30, respectively, have been extracted up to an excitation energy of 10 MeV. The major part of one neutron removal, CD cross-sections of those nuclei populate the core, in its ground state. A comparison with the direct breakup model, suggests the predominant occupation of the valence neutron in the ground state of Na-29 (3/2(+)) and Na-30 (2(+)) is the d-orbital with a small contribution from the s-orbital, which are coupled with the ground state of the core. One of the major components of the ground state configurations of these nuclei are Na-28(gs)(1(+)) circle times v(s,d) and Na-29(gs)(3/2(+)) circle times v(s,d), respectively. The ground state spin and parity of these nuclei obtained from this experiment are in agreement with earlier reported values. The spectroscopic factors for the valence neutron occupying the s and d orbitals for these nuclei in the ground state have been extracted and reported for the first time. A comparison of the experimental findings with shell model calculation using the MCSM suggests a lower limit of around 4.3 MeV of the sd-pf shell gap in Na-30.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- ground state configuration
- Coulomb breakup
- spectroscopic factor
- island of inversion
- RIB
- neutron-rich nulei
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- art (subject category)
- ref (subject category)
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- Rahaman, A.
- Datta, U.
- Aumann, T.
- Beceiro-Novo, S.
- Boretzky, K.
- Caesar, C.
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- Carlson, B. V.
- Catford, W. N.
- Chakraborty, S.
- Chartier, M.
- Cortina-Gil, D.
- de Angelis, G.
- Diaz Fernandez, ...
- Emling, H.
- Ershova, O.
- Fraile, L.M.
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- Leifels, Y.
- Marganiec, J.
- Munzenberg, G.
- Najafi, M. A.
- Nilsson, Thomas, ...
- Nociforo, C.
- Panin, V.
- Paschalis, S.
- Plag, R.
- Reifarth, R.
- Ricciardi, M. V.
- Rigollet, C.
- Rossi, D.
- Scheidenberger, ...
- Scheit, H.
- Simon, H.
- Taylor, J. T.
- Togano, Y.
- Typel, S.
- Volkov, V.
- Wagner, A.
- Wamers, F.
- Weick, H.
- Weigand, M.
- Winfield, J. S.
- Yakorev, D.
- Zoric, M.
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