Production of neutron-rich nuclei at the limits of particles stability by fragmentation of projectiles

Langevin, M.; Quiniou, É.; Bernas, M.; Galin, J.; Jacmart, J.C.; Naulin, F.; Pougheon, F.; Anne, R.; Détraz, C.; Guerreau, D.; Guillemaud‐Mueller, D.; Mueller, A. C.

doi:10.1016/0370-2693(85)90140-6

Cited by 109 publications

(37 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…22 C was first observed to be bound in 1986 [12]. It is a Borromean nucleus because the two-body sub-system 21 C had been shown to be unbound [13], contradicting an earlier measurement which had claimed that 21 C was bound [14]. It took nearly 25 years before first properties of 22 C were measured.…”

Section: Introductionmentioning

confidence: 93%

Search for 21C and constraints on 22C

et al. 2013

View full text Add to dashboard Cite

A search for the neutron-unbound nucleus 21 C was performed via the single proton removal reaction from a beam of 22 N at 68 MeV/u. Neutrons were detected with the Modular Neutron Array (MoNA) in coincidence with 20 C fragments. No evidence for a low-lying state was found, and the reconstructed 20 C+n decay energy spectrum could be described with an s-wave line shape with a scattering length limit of |a s | < 2.8 fm, consistent with shell model predictions. A comparison with a renormalized zero-range three-body model suggests that 22 C is bound by less than 70 keV.

show abstract

Section: Introductionmentioning

confidence: 93%

Search for 21C and constraints on 22C

et al. 2013

View full text Add to dashboard Cite

show abstract

“…It would be interesting to further explore this mass region to see if this trend continues. Extension of the present technique to lighter N = 19 isotones (Z ≤ 8) would be very difficult, if not impossible, since they are all unbound by three or more neutrons [36][37][38][39][40]. However, a similar technique could potentially be used in the N = 20 isotonic chain by performing a direct mass measurement of bound 29 F. For this purpose, the precision obtainable with time-of-flight techniques at current in-flight radioactive beam facilities would likely be sufficient.…”

Section: Discussionmentioning

confidence: 99%

Spectroscopy of neutron-unbound27,28F

et al. 2012

View full text Add to dashboard Cite

“…The measured 28 F ground state energy is in good agreement with USDA/USDB shell model predictions, indicating that p f shell intruder configurations play only a small role in the ground state structure of 28 F and establishing a low-Z boundary of the island of inversion for N = 19 isotones. A hallmark of the nuclear shell model is its reproduction of large energy gaps at nucleon numbers 2,8,20,28,50,82, and 126. Although well established in stable nuclei, these magic numbers begin to disappear for nuclei far from stability.…”

mentioning

confidence: 99%

“…as outlined in [17]. The fluorine isotopic chain is also the only area in which the intruder structure of Z < 10, N ≥ 19 nuclei can be examined in any detail since the neutron dripline for all lighter elements is located at N ≤ 16 [18][19][20][21][22]. This means that the N = 19 isotones of oxygen and below are unbound with respect to three or more neutrons, making their study extremely difficult, if not impossible.…”

mentioning

confidence: 99%

Exploring the Low-ZShore of the Island of Inversion atN=19

Christian¹,

Frank²,

Ash³

et al. 2012

Phys. Rev. Lett.

View full text Add to dashboard Cite

The technique of invariant mass spectroscopy has been used to measure, for the first time, the ground state energy of neutron-unbound 28 F, determined to be a resonance in the 27 F + n continuum at 220(50) keV. States in 28 F were populated by the reactions of a 62 MeV/u 29 Ne beam impinging on a 288 mg/cm 2 beryllium target. The measured 28 F ground state energy is in good agreement with USDA/USDB shell model predictions, indicating that p f shell intruder configurations play only a small role in the ground state structure of 28 F and establishing a low-Z boundary of the island of inversion for N = 19 isotones.PACS numbers: 21.10.Dr, 21.10.Pc A hallmark of the nuclear shell model is its reproduction of large energy gaps at nucleon numbers 2, 8, 20, 28, 50, 82, and 126. Although well established in stable nuclei, these magic numbers begin to disappear for nuclei far from stability. For example, it has been known for over 30 years that the large shell gap at N = 20 diminishes for neutron-rich nuclei [1][2][3][4]. The change in shell structure around N = 20 is now known to be a result of the tensor force, which is strongly attractive for the spin flip pairs πd 5/2 -νd 3/2 and strongly repulsive for the pairs πd 5/2 -ν f 7/2 [5][6][7]. For nuclei in the region of N ∼ 20 and Z 13, the reduced N = 20 gap allows p f shell intruder configurations, in the form of multi-particle, multi-hole (npnh or nℏω) cross shell excitations, to compete with standard sd only configurations if the gain in correlation energy is on the same order as the size of the shell gap [8][9][10]. This has led to the establishment of the "island of inversion"-a region of nuclei near N = 20 for which the intruder configuration is dominant in the ground state.

show abstract

Production of neutron-rich nuclei at the limits of particles stability by fragmentation of projectiles

Cited by 109 publications

References 7 publications

Search for 21C and constraints on 22C

Search for 21C and constraints on 22C

Spectroscopy of neutron-unbound27,28F

Exploring the Low-ZShore of the Island of Inversion atN=19

Contact Info

Product

Resources

About