Direct Mass Measurements of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">B</mml:mi><mml:mprescripts /><mml:none /><mml:mn>19</mml:mn></mml:mmultiscripts></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">C</mml:mi><mml:mprescripts /><mml:none /><mml:mn>22</mml:mn></mml:mmultiscripts></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"

Gaudefroy, L.; Mittig, W.; Orr, N. A.; Varet, S.; Chartier, M.; Roussel‐Chomaz, P.; Ebran, J.-P.; Fernández–Domínguez, B.; Frémont, G.; Gangnant, P.; Gillibert, A.; Grévy, S.; Libin, J. F.; Маслов, В. А.; Paschalis, S.; Pietras, B.; Penionzhkevich, Yu. É.; Spitaëls, C.; Villari, A. C. C.

doi:10.1103/physrevlett.109.202503

Cited by 140 publications

(138 citation statements)

References 35 publications

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“…By combining one-neutron (1n)-removal reactions on carbon and lead targets and exploiting their different sensitivities to the configurations of the removed neutron, the 31 Ne ground state has been demonstrated to have spin parity 3/2 − [10,11]. This result, consistent with the largescale SM calculations with the SDPF-M effective interaction [15], shows that the very weakly bound 31 Ne ground state [16] has a sizable 2p 3/2 halo component. The SM calculations indicate that the 31 Ne ground state is dominated by 3p-2h configurations and is suggestive of a large prolate deformation (β ≈ 0.6).…”

Section: Introductionsupporting

confidence: 75%

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: 75%

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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“…The experiment was carried out at the National Superconducting Cyclotron Laboratory (NSCL) where a 140 MeV/nucleon 48 Ca beam impinged upon a 9 Be target with a thickness of 1363 mg/cm 2 to produce an 24 O beam at 83.4 MeV/nucleon. The A1900 fragment separator was used to select 24 O from the other fragmentation products, and the remaining beam contaminants were removed by time-of-flight in the off-line analysis.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…At present, there are no reports of boundor unbound-excited states in the lighter isotones 23 N and 22 C. The measurement of these excited states can provide a better understanding of the changing shell structure in this region of the nuclear chart by extending our knowledge of the N=16 gap into the proton p-shell. In this article, we present first experimental information on neutron-unbound excited states in 23 N populated via proton-knockout from 24 O.…”

Section: Introductionmentioning

confidence: 99%

Neutron-unbound excited states of N23

et al. 2017

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Neutron unbound states in23 N were populated via proton knockout from an 83.4 MeV/nucleon 24 O beam on a liquid deuterium target. The two-body decay energy displays two peaks at E1 ∼ 100 keV and E2 ∼ 1 MeV with respect to the neutron separation energy. The data are consistent with shell model calculations predicting resonances at excitation energies of ∼ 3.6 MeV and ∼ 4.5 MeV. The selectivity of the reaction implies that these states correspond to the first and second 3/2 − states. The energy of the first state is about 1.3 MeV lower than the first excited 2 + in 24 O. This decrease is largely due to coupling with the πp −1 3/2 hole along with a small reduction of the N = 16 shell gap in 23 N.

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“…For instance, the masses of Borromean drip-line nuclei 19 B, 22 C, 29 F, and 34 Na have been measured only by TOF-Bρ-MS to date [62]. New results from GANIL [62,63] and NSCL [64,65] are summarized in Fig. 6.…”

Section: The Achievable Relative Precision Of Pmts With the Tof-icr Tmentioning

confidence: 99%

Toward precision mass measurements of neutron-rich nuclei relevant to r-process nucleosynthesis

et al. 2015

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The open question of where, when, and how the heavy elements beyond iron enrich our Universe has triggered a new era in nuclear physics studies. Of all the relevant nuclear physics inputs, the mass of very neutron-rich nuclides is a key quantity for revealing the origin of heavy elements beyond iron. Although the precise determination of this property is a great challenge, enormous progress has been made in recent decades, and it has contributed significantly to both nuclear structure and astrophysical nucleosynthesis studies. In this review, we first survey our present knowledge of the nuclear mass surface, emphasizing the importance of nuclear mass precision in r-process calculations. We then discuss recent progress in various methods of nuclear mass measurement with a few selected examples. For each method, we focus on recent breakthroughs and discuss possible ways of improving the weighing of r-process nuclides.

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Direct Mass Measurements ofB19,C22,

Cited by 140 publications

References 35 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

Neutron-unbound excited states of N23

Toward precision mass measurements of neutron-rich nuclei relevant to r-process nucleosynthesis

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