Effective interaction of protons and neutrons in the subshells

Gross, Ruth T.; Frenkel, A.

doi:10.1016/0375-9474(76)90645-x

Cited by 188 publications

(124 citation statements)

References 24 publications

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“…4). This result should not be affected by Coulomb effects as, for I Þ 0, Coulomb shifts are essentially constant in this model space [31]. However, this g ÿ2 9=2 interpretation of the 2 ÿ 8 energy difference could be altered when extended model spaces are considered.…”

mentioning

confidence: 90%

Observation of Isomeric Decays in ther-Process Waiting-Point NucleusCd82130

Jungclaus¹,

Cáceres²,

Górska³

et al. 2007

Phys. Rev. Lett.

148

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The decay of excited states in the waiting-point nucleus 130 Cd 82 has been observed for the first time. An 8 two-quasiparticle isomer has been populated both in the fragmentation of a 136 Xe beam as well as in projectile fission of 238 U, making 130 Cd the most neutron-rich N 82 isotone for which information about excited states is available. The results, interpreted using state-of-the-art nuclear shell-model calculations, show no evidence of an N 82 shell quenching at Z 48. They allow us to follow nuclear isomerism throughout a full major neutron shell from 98 Cd 50 to 130 Cd 82 and reveal, in comparison with 76 Ni 48 one major proton shell below, an apparently abnormal scaling of nuclear two-body interactions. DOI: 10.1103/PhysRevLett.99.132501 PACS numbers: 21.60.Cs, 23.20.Lv, 26.30.+k, 27.60.+j The pioneering work of Goeppert-Mayer [1] and Haxel, Jensen, and Suess [2] in realizing that the experimental evidence for nuclear magic numbers could be explained by assuming a strong spin-orbit interaction constituted a major milestone in our understanding of the internal structure of the atomic nucleus. However, it has been recognized for more than 20 years that the single-particle ordering which underlies the shell structure (and with it the magic numbers) may change for nuclei approaching the neutron dripline. It has been argued that the neutron excess causes the central potential to become diffuse, leading to a modification of the single-particle spectrum of neutron-dripline nuclei [3,4]. In addition, a strong interaction between the energetically bound orbitals and the continuum also affects the level ordering. The consequence of these modifications can be a shell quenching; i.e., the shell gaps at magic neutron numbers are less pronounced in very neutronrich nuclei than in nuclei closer to stability. At the extreme, these gaps may even disappear. Alternatively, the tensor part of the nuclear force has been shown to cause shell reordering for very asymmetric proton and neutron numbers [5,6].The N 82 isotones below the doubly magic nucleus 132 Sn are crucial for stellar nucleosynthesis due to the close relation between the N 82 shell closure and the A 130 peak of the solar r-process abundance distribution. Based on the mass models available at that time, it was shown in the 1990s that the assumption of a quenching of the N 82 neutron shell closure leads to a considerable improvement in the global abundance fit in r-process calculations [7,8], in particular, a filling of the troughs around A 120 and 140. On the other hand, recently, alternative descriptions of the phenomenon have been given without invoking shell quenching at all [9,10]. Unfortunately, the very PRL 99,

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mentioning

confidence: 90%

Observation of Isomeric Decays in ther-Process Waiting-Point NucleusCd82130

Jungclaus¹,

Cáceres²,

Górska³

et al. 2007

Phys. Rev. Lett.

148

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“…The results of a shell-model calculation using the GrossFrenkel interaction [56] in a 1g 9/2 -2p 1/2 model space are shown to the right of Fig. 16.…”

Section: 43 Tc 43mentioning

confidence: 99%

“…It has been suggested that in x-ray emitting binary systems, nuclei are synthesized via the rapid proton capture process (rp-process) [7] in which a sequence of proton captures and β decays is responsible for the burning of hydrogen into heavier elements. The rp-process proceeds through the exotic mass region with N ∼ Z above 56 Ni close to the proton dripline. Modern reaction network calculations [8] have suggested that the rp-process can extend up to the heavy Sn-Te mass region, involving nuclei of interest in the current study.…”

mentioning

confidence: 99%

Isomeric states in neutron-deficientA~80–90nuclei populated in the fragmentation ofAg107
Garnsworthy¹,
Regan²,
Piétri³
et al. 2009
Phys. Rev. C
31
1
6
1
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The relativistic projectile fragmentation of a 750 MeV per nucleon beam of 107 Ag was used to populate isomeric states in neutron-deficient nuclei around A = 80-90. Reaction products were separated and unambiguously identified using the GSI FRagment Separator (FRS) and its ancillary detectors. At the final focal plane, the fragments were slowed from relativistic energies by means of an aluminium degrader and implanted in a passive stopper in the center of the high-efficiency, high-granularity Stopped Rare Isotope Spectroscopic INvestigation at GSI (RISING) germanium array. This allowed the identification of excited states in the N = Z nuclei 86 43 Tc and, for the first time, 82 41 Nb. Isomeric states have also been identified for the first time in 87,88 Tc, and a previously unreported isomer was observed in 84 Nb. Experimental results are presented along with a discussion on the structure of these nuclei based on interpretations provided by several theoretical models.

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“…The effect of particle excitation from p 3/2 and f 5/2 orbitals were ignored. However, it was found that the calculated energies as reported by Gross and Frenkel [22] significantly differ from the experimental level energies at low spin. In the present work, the measured levels of 88 Zr have been compared with large scale shell model calculations based on the full unrestricted f 5/2 pg 9/2 model space with newly developed JUN45 [15] and jj44b [16] interactions.…”

mentioning

confidence: 70%

“…This suggests significant contribution from two neutron holes at g 9/2 orbitals in the excited states of both nuclei. Previous shell model calculations reported for this nucleus were mostly carried out using 88 Sr core having only p 1/2 and g 9/2 orbitals available for excitation with two neutron holes and two proton particles [22,23]. The effect of particle excitation from p 3/2 and f 5/2 orbitals were ignored.…”

mentioning

confidence: 99%

Nuclear structure studies with INGA coupled to a fast DDAQ

Palit

2014

AIP Conference Proceedings

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Effective interaction of protons and neutrons in the subshells

Cited by 188 publications

References 24 publications

Observation of Isomeric Decays in ther-Process Waiting-Point NucleusCd82130

Observation of Isomeric Decays in ther-Process Waiting-Point NucleusCd82130

Isomeric states in neutron-deficientA~80–90nuclei populated in the fragmentation ofAg107
Garnsworthy¹,
Regan²,
Piétri³
et al. 2009
Phys. Rev. C
31
1
6
1
View full text Add to dashboard Cite

Nuclear structure studies with INGA coupled to a fast DDAQ

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Effective interaction of protons and neutrons in the subshells

Cited by 188 publications

References 24 publications

Observation of Isomeric Decays in ther-Process Waiting-Point NucleusCd82130

Observation of Isomeric Decays in ther-Process Waiting-Point NucleusCd82130

Isomeric states in neutron-deficientA~80–90nuclei populated in the fragmentation ofAg107Garnsworthy1, Regan2, Piétri3 et al. 2009Phys. Rev. C31161View full textAdd to dashboardCite

Nuclear structure studies with INGA coupled to a fast DDAQ

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Isomeric states in neutron-deficientA~80–90nuclei populated in the fragmentation ofAg107
Garnsworthy¹,
Regan²,
Piétri³
et al. 2009
Phys. Rev. C
31
1
6
1
View full text Add to dashboard Cite