Evolution of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>50</mml:mn></mml:math>Shell Gap Energy towards<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Ni</mml:mi><mml:mprescripts /><mml:none /><mml:mn>78</mml:mn></mml:mmultiscripts></mml:math>

Hakala, J.; Rahaman, S.; Elomaa, V.‐V.; Eronen, T.; Hager, U.; Jokinen, A.; Kankainen, A.; Moore, I. D.; Penttilä, H.; Rinta‐Antila, S.; Rissanen, J.; Saastamoinen, A.; Sonoda, T.; Weber, C.; Äystö, J.

doi:10.1103/physrevlett.101.052502

Cited by 152 publications

(58 citation statements)

References 34 publications

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“…The scalability is a result of the truncation of the model. The results of the calculations for the decay of 82 Ga are very consistent with the initial shell-gap energy of 3.88 MeV, which is compatible with the experimental results from mass measurement by J. Hakala et al [40]. The 83 Zn decay data could point to a somewhat higher gap energy of about 4.2 MeV, but both results could be strongly affected by the choice of the pn interactions between particles in active orbitals and should be a subject for further theoretical work.…”

Section: Gamow-teller Decays Of Zinc and Gallium Isotopessupporting

confidence: 80%

Reexamining Gamow-Teller decays nearNi78

Alshudifat¹,

Grzywacz²,

Madurga³

et al. 2016

Phys. Rev. C

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Decays of neutron-rich nuclei 82,83 Zn and 82,83 Ga produced in proton-induced fission of 238 U were studied at the Holifield Radioactive Ion Beam Facility (HRIBF) using on-line mass separation and β-γ spectroscopy techniques. New γ-ray transitions were identified and level schemes, which include states at high excitation energies in the range between 3 to 7 MeV were constructed. These high energy levels were identified to be populated through allowed Gamow-Teller β-transitions, and their structure was interpreted with new shell model calculations. A β-delayed neutron branching ratio of 69±7% was deduced for 82 Zn and revised β-decay half-life values of 82 Zn (155(17)(20) ms) and 83 Zn (122(28) ms) were determined.

show abstract

Section: Gamow-teller Decays Of Zinc and Gallium Isotopessupporting

confidence: 80%

Reexamining Gamow-Teller decays nearNi78

Alshudifat¹,

Grzywacz²,

Madurga³

et al. 2016

Phys. Rev. C

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“…Conversely, the evolution of the neutron N ¼ 50 shell closure has been established down to Z ¼ 30 by nuclear mass measurements. The corresponding two-neutron separation energies show a decreasing N ¼ 50 shell gap from Z ¼ 40 to Z ¼ 32 and a subsequent increase in Z ¼ 30; 31 [16,17]. If the increasing trend observed below Z ¼ 32 was retained, an enhanced N ¼ 50 shell-gap energy relative to neighboring isotopic chains is expected at Z ¼ 28, forming a robust neutron shell closure in 78 Ni [16,18].…”

mentioning

confidence: 91%

“…The corresponding two-neutron separation energies show a decreasing N ¼ 50 shell gap from Z ¼ 40 to Z ¼ 32 and a subsequent increase in Z ¼ 30; 31 [16,17]. If the increasing trend observed below Z ¼ 32 was retained, an enhanced N ¼ 50 shell-gap energy relative to neighboring isotopic chains is expected at Z ¼ 28, forming a robust neutron shell closure in 78 Ni [16,18]. Despite these extensive studies, the doubly magic character of 78 Ni has not been verified experimentally, especially for the proton shell magicity in 78 Ni.…”

mentioning

confidence: 96%

β -Decay Half-Lives of Co76,77 ,
Xu¹,
Nishimura²,
Lorusso³
et al. 2014
Phys. Rev. Lett.
112
7
57
0
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The half-lives of 20 neutron-rich nuclei with Z ¼ 27-30 have been measured at the RIBF, Atomic nuclei are quantum many-body systems consisting of two distinct types of fermions-protons and neutrons. Analogous to atomic physics, the concept of nuclear shell structure was triggered by the discovery of particularly stable nuclei with specific numbers of proton and neutron, such as 2, 8,20,28, 50, 82, and 126 along the β-stability line [1]. By assuming a strong spin-orbit interaction within a mean field potential, these magic numbers were correctly interpreted and regarded to be immutable throughout the nuclear chart [2,3]. However, with the development of experimental techniques exploiting radioactive ion beams, many nuclei with extreme neutron-to-proton ratios (N=Z), so-called exotic nuclei, have been produced and studied in the last few decades. The results obtained heretofore have demonstrated that the shell structure established for nuclei near the β-stability line may change drastically in these exotic nuclei. For instance, classical magic numbers in 12 Be (N ¼ 8), 32 Mg (N ¼ 20), and 42 Si (N ¼ 28) were found to disappear [4-6], whereas new magic numbers emerged in 24 O (N ¼ 16) and 54 Ca (N ¼ 34) [7][8][9]. To address the origins of shell evolution in heavier mass regions, it is of particular interest to investigate the properties of nuclei in the vicinity of 78 Ni, which has the proton number Z ¼ 28 and the neutron number N ¼ 50 with a large neutron excess N=Z ≈ 1.8.To study the shell evolution around 78 Ni, many experimental efforts have been made. One of the interesting phenomena related to the proton Z ¼ 28 shell gap is the monopole migration in Cu isotopes. A sudden drop of the excited 5=2− state relative to the ground 3=2 − state was observed in 71;73 Cu [10,11]. These two states are characterized by a single-particle nature [12] and their order was

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“…On the other side of the nuclear chart, the most neutron-rich selenium and germanium isotopes accessible for experiments are around the magic neutron number N = 50. Considerable experimental and theoretical efforts have recently been focused in this region on the investigation of the shell structure approaching the doubly magic nucleus 78 Ni (see, e.g., [14][15][16][17][18]). The description of nuclei in this region poses a challenge for shell-model calculations since the full pf shell and the neutron g 9/2 intruder orbital would be needed with the corresponding effective interaction.…”

Section: Introductionmentioning

confidence: 99%

Collectivity atN=50:Ge82and
Gade
¹
,
Baugher
²
,
Bazin
³

et al. 2010
Phys. Rev. C
61
9
81
0
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Evolution of theN=50Shell Gap Energy towardsNi78

Cited by 152 publications

References 34 publications

Reexamining Gamow-Teller decays nearNi78

Reexamining Gamow-Teller decays nearNi78

β -Decay Half-Lives of Co76,77 ,
Xu¹,
Nishimura²,
Lorusso³
et al. 2014
Phys. Rev. Lett.
112
7
57
0
View full text Add to dashboard Cite

Collectivity atN=50:Ge82and
Gade
¹
,
Baugher
²
,
Bazin
³

et al. 2010
Phys. Rev. C
61
9
81
0
View full text Add to dashboard Cite

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Evolution of theN=50Shell Gap Energy towardsNi78

Cited by 152 publications

References 34 publications

Reexamining Gamow-Teller decays nearNi78

Reexamining Gamow-Teller decays nearNi78

β -Decay Half-Lives of Co76,77 , Xu1, Nishimura2, Lorusso3 et al. 2014Phys. Rev. Lett.1127570View full textAdd to dashboardCite

Collectivity atN=50:Ge82andGade1, Baugher2, Bazin3 et al. 2010Phys. Rev. C619810View full textAdd to dashboardCite

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β -Decay Half-Lives of Co76,77 ,
Xu¹,
Nishimura²,
Lorusso³
et al. 2014
Phys. Rev. Lett.
112
7
57
0
View full text Add to dashboard Cite

Collectivity atN=50:Ge82and
Gade
¹
,
Baugher
²
,
Bazin
³

et al. 2010
Phys. Rev. C
61
9
81
0
View full text Add to dashboard Cite