Observation of a Large Reaction Cross Section in the Drip-Line Nucleus<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="bold">C</mml:mi><mml:mprescripts /><mml:none /><mml:mn>22</mml:mn></mml:mmultiscripts></mml:math>

Tanaka, K.; Yamaguchi, Takayuki; Suzuki, Toshio; Ohtsubo, T.; Fukuda, M.; Nishimura, D.; Takechi, M.; Ogata, Kazuyuki; Ozawa, A.; Izumikawa, T.; Aiba, T.; Aoi, N.; Baba, H.; Hashizume, Yutaka; Inafuku, K.; Iwasa, N.; Kobayashi, K.; Komuro, M.; Kondo, Y.; Kubo, T.; Kurokawa, M.; Matsuyama, Tohey; Michimasa, S.; Motobayashi, T.; Nakabayashi, T.; Nakajima, S.; Nakamura, Takashi; Sakuraï, H.; Shinoda, R.; Shinohara, M.; Suzuki, Hiroshi; Takeshita, Eri; Takeuchi, Satoshi; Togano, Y.; Yamada, K.; Yasuno, T.; Yoshitake, Michiko

doi:10.1103/physrevlett.104.062701

Cited by 207 publications

(170 citation statements)

References 29 publications

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“…Neutron-rich nuclei far from the valley of stability became experimentally reachable in the past two decades. The neutron-rich carbon isotopes showing interesting phenomena like one- [1] and two-neutron halo [2,3], neutron decoupling [4,5], weakening of the neutronneutron effective interaction [6], development of the N = 16 subshell closure, and disappearance of the N = 14 one [7] was in focus for a long time.…”

Section: Introductionmentioning

confidence: 99%

γ-ray spectroscopy ofC19via the single-neutron knock-out reaction

et al. 2015

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Section: Introductionmentioning

confidence: 99%

γ-ray spectroscopy ofC19via the single-neutron knock-out reaction

et al. 2015

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“…For very loosely bound nucleons, which do not suffer the constraint of the centrifugal or Coulomb barrier, the wave functions develop long tails, extending well into the classically forbidden region. A primary signature of the halo phenomenon has been the sudden increase of the matter radius within a given isotopic chain [4]. In this respect, precision measurements of nuclear radii in traps open new possibilities [5,6].…”

Section: Introductionmentioning

confidence: 99%

The ratio method: A new tool to study one-neutron halo nuclei

2013

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Recently a new observable to study halo nuclei was introduced, based on the ratio between breakup and elastic angular cross sections. This new observable is shown by the analysis of specific reactions to be independent of the reaction mechanism and to provide nuclear structure information of the projectile. Here we explore the details of this ratio method, including the sensitivity to binding energy and angular momentum of the projectile. We also study the reliability of the method with breakup energy. Finally, we provide guidelines and specific examples for experimentalists who wish to apply this method.

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“…At present there is no evidence for a shell closure at the N = 14 nucleus 20 C [32], despite the N = 14 shell closure at 22 O. Furthermore, Efimov physics may be at play in 22 C [33,34]. This Letter takes the first steps towards an ab-initio shell-model description of the neutron-rich carbon isotopes, and addresses the role of 3NFs in these isotopes.…”

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Ab InitioCoupled-Cluster Effective Interactions for the Shell Model: Application to Neutron-Rich Oxygen and Carbon Isotopes

et al. 2014

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We derive and compute effective valence-space shell-model interactions from ab-initio coupledcluster theory and apply them to open-shell and neutron-rich oxygen and carbon isotopes. Our shell-model interactions are based on nucleon-nucleon and three-nucleon forces from chiral effectivefield theory. We compute the energies of ground and low-lying states, and find good agreement with experiment. In particular our calculations are consistent with the N = 14, 16 shell closures in 22,24 O, while for 20 C the corresponding N = 14 closure is weaker. We find good agreement between our coupled-cluster effective-interaction results with those obtained from standard single-reference coupled-cluster calculations for up to eight valence neutrons. Introduction. -The nuclear shell model is the foundation on which our understanding of nuclei is built. One of the most important problems in nuclear structure today is to understand how shell structure changes with neutron-to-proton ratio throughout the nuclear chart. Shell structure influences the locations of the neutron and proton drip lines and the stability of matter. Examples of changes in shell structure are the appearance of new magic numbers N = 14 and N = 16 in the neutron-rich oxygen isotopes [1,2], and the emergence of an N = 34 sub-shell closure in 54 Ca [3][4][5][6].Phenomenological shell-model Hamiltonians such as the sd Hamiltonian of Brown and Wildenthal [7,8] (abbreviated USD) and the p-sd Hamiltonian of Warturburton and Brown [9] (abbreviated WBP), have successfully described properties of nuclei with proton number Z and neutron number N less than about 20. To understand the origin of shell structure, however, researchers are now trying to derive the shell model from realistic nucleonnucleon (NN) and three-nucleon forces (3NFs), without further phenomenology [3,10,11]. Within the last few years, for example, Otsuka et al. [11] showed that 3NFs play a pivotal role in placing the drip line (correctly) in the oxygen isotopes at 24 O, and Holt et al. [3] showed that the inclusion of 3NFs are necessary to explain the high 2 + state in 48 Ca .Until recently, all work to compute effective shellmodel interactions was perturbative.Lately, however, nonperturbative calculations have become possible. Some have been based on the ab-initio no-core shell model [12,13], via a valence-cluster expansion [14][15][16], and others on the in-medium similarity renormalization group [17]. In this Letter we use a third approach, the ab-initio coupled-cluster method [18][19][20][21][22][23], to construct effective shell-model interactions for use in open-shell and neutron-rich nuclei. Starting from NN interactions and 3NFs generated by chiral effective-field-theory, we compute the ground-and excited-state energies of neutronrich carbon and oxygen isotopes with up to eight neu-

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Observation of a Large Reaction Cross Section in the Drip-Line NucleusC22

Cited by 207 publications

References 29 publications

γ-ray spectroscopy ofC19via the single-neutron knock-out reaction

γ-ray spectroscopy ofC19via the single-neutron knock-out reaction

The ratio method: A new tool to study one-neutron halo nuclei

Ab InitioCoupled-Cluster Effective Interactions for the Shell Model: Application to Neutron-Rich Oxygen and Carbon Isotopes

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