One- and two-neutron removal reactions from the most neutron-rich carbon isotopes

Kobayashi, N.; Nakamura, Takashi; Tostevin, J. A.; Kondo, Y.; Aoi, N.; Baba, H.; Deguchi, S.; Gibelin, J.; Ishihara, M.; Kawada, Y.; Kubo, T.; Motobayashi, T.; Ohnishi, T.; Orr, N. A.; Otsu, H.; Sakuraï, H.; Satou, Y.; Simpson, E. C.; Sumikama, T.; Takeda, Hiroyuki; Takechi, M.; Takeuchi, Satoshi; Tanaka, K.; Tanaka, Naoki; Togano, Y.; Yoneda, K.

doi:10.1103/physrevc.86.054604

Cited by 93 publications

(96 citation statements)

References 57 publications

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“…IV A). This observed level ordering is in agreement with the SDPF-M SM level scheme, which, however, places the lowest 27 Ne(3/2 − ) state at 170 keV in excitation. In contrast, the SM calculations predict the lowest 31 Ne(3/2 + ) state to be at 680 keV.…”

Section: Introductionsupporting

confidence: 76%

“…This excited 3/2 + level has not yet been observed experimentally. Hence, both experimentally and according to the SDPF-M, there is a spin-parity inversion of the ground states between 27 Ne and 31 Ne. For 29 Ne, of interest here, the ground-state spin parity has not been reported.…”

Section: Introductionmentioning

confidence: 99%

“…Recent 26 Ne(d, p) reaction studies have demonstrated that the lowest 3/2 − state is at 765 keV, while the 27 Ne ground state is 3/2 + [18][19][20][21] (see also Fig. 4 in Sec.…”

Section: Introductionmentioning

confidence: 99%

“…For the lighter neutron-rich neon isotopes, neutron removal from 28 Ne suggested that significant 2p 3/2 intruder configurations are present at low excitation energies in 27 Ne [18]. Recent 26 Ne(d, p) reaction studies have demonstrated that the lowest 3/2 − state is at 765 keV, while the 27 Ne ground state is 3/2 + [18][19][20][21] (see also Fig.…”

Section: Introductionmentioning

confidence: 99%

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One-neutron removal fromNe29: Defining the lower limits of the island of inversion

Kobayashi¹,

Nakamura²,

Kondo³

et al. 2016

Phys. Rev. C

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Background: Very neutron-rich isotopes, including 30−32 Ne, in the vicinity of N = 20 are known to exhibit ground states dominated by fp-shell intruder configurations: the "island of inversion." Systematics for the Ne-isotopic chain suggest that such configurations may be in strong competition with normal shell-model configurations in the ground state of 29 Ne. Purpose: A determination of the structure of 29 Ne is thus important to delineate the extent of the island of inversion and better understand structural evolution in neutron-rich Ne isotopes. This is accomplished here through a combined investigation of nuclear and Coulomb-induced one-neutron removal reactions. Method: Cross sections for one-neutron removal on carbon and lead targets and the parallel momentum distribution of the 28 Ne residues from the carbon target are measured at around 240 MeV/nucleon. The measurements are compared with reaction calculations combined with spectroscopic information from SDPF-M shell-model wave functions. Results: The deduced width of the inclusive parallel momentum distribution, 98(12) MeV/c (FWHM), suggests that the ground state of 29 Ne has a spin parity of 3/2 − . Detailed comparisons of the measured inclusive and partial cross sections of the two targets and the parallel momentum distribution of the carbon target with reaction calculations, combined with spectroscopic information from large-scale shell-model calculations, are all consistent with a 3/2 − spin-parity assignment. Conclusions

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Section: Introductionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

“…Recent 26 Ne(d, p) reaction studies have demonstrated that the lowest 3/2 − state is at 765 keV, while the 27 Ne ground state is 3/2 + [18][19][20][21] (see also Fig. 4 in Sec.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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One-neutron removal fromNe29: Defining the lower limits of the island of inversion

Kobayashi¹,

Nakamura²,

Kondo³

et al. 2016

Phys. Rev. C

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“…Separation energies, spin assignments for lowlying states, the energies of 2 + states, and transition rates in these isotopes all depend on the locations of shell gaps. [24][25][26][27][28][29][30][31]. 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.…”

mentioning

confidence: 65%

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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Transfer to the Continuum Calculations of Quasifree (p, pn) and (p, 2p) Reactions at Intermediate and High Energies

Gómez-Ramos

Moro

2016

Springer Proceedings in Physics

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One- and two-neutron removal reactions from the most neutron-rich carbon isotopes

Cited by 93 publications

References 57 publications

One-neutron removal fromNe29: Defining the lower limits of the island of inversion

One-neutron removal fromNe29: Defining the lower limits of the island of inversion

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

Transfer to the Continuum Calculations of Quasifree (p, pn) and (p, 2p) Reactions at Intermediate and High Energies

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