New subshell closure at N=58 emerging in neutron-rich nuclei beyond 78Ni

被引：60

作者：

Winger, J. A. ^{[1
]}

Rykaczewski, K. P. ^{[2
]}

Gross, C. J. ^{[2
]}

Grzywacz, R. ^{[2
,3
]}

Batchelder, J. C. ^{[4
]}

Goodin, C. ^{[5
]}

Hamilton, J. H. ^{[5
]}

Ilyushkin, S. V. ^{[1
]}

Korgul, A. ^{[3
,5
,6
,7
]}

Krolas, W. ^{[7
,8
]}

Liddick, S. N. ^{[3
,4
]}

Mazzocchi, C. ^{[3
,9
,10
]}

Padgett, S. ^{[3
]}

Piechaczek, A. ^{[11
]}

Rajabali, M. M. ^{[3
]}

Shapira, D. ^{[2
]}

Zganjar, E. F. ^{[11
]}

Dobaczewski, J. ^{[12
,13
]}

机构：

[1] Mississippi State Univ, Dept Phys & Astron, Mississippi State, MS 39762 USA

[2] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA

[3] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[4] Oak Ridge Associated Univ, UNIRIB, Oak Ridge, TN 37831 USA

[5] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[6] Warsaw Univ, Inst Expt Phys, PL-00681 Warsaw, Poland

[7] Joint Inst Heavy Ion React, Oak Ridge, TN 37831 USA

[8] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland

[9] Univ Milan, I-20133 Milan, Italy

[10] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

[11] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[12] Warsaw Univ, Inst Theoret Phys, PL-00681 Warsaw, Poland

[13] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland

来源：

PHYSICAL REVIEW C | 2010年 / 81卷 / 04期

基金：

芬兰科学院;

关键词：

DECAY SPECTROSCOPY; SHELL STRUCTURE; ISOTOPES;

D O I：

10.1103/PhysRevC.81.044303

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The structure of neutron-rich nuclei beyond Ni-78 was studied using postaccelerated radioactive beams of Ga-83,Ga-84,Ga-85 utilizing beta gamma and beta-n gamma spectroscopy. Our data, when combined with energy level systematics, suggests a possible new spherical subshell closure at N = 58 is created by the nearly degenerated nu 3s(1/2) and nu 2d(5/2) orbitals being well separated from other orbitals above N = 50. The near degeneracy of these states could be evidenced by isomerism in this region. The energies of the 2(1)(+) and proposed 4(1)(+) states observed in N = 52 Ge-84 are interpreted as an indication of a possible weakening of the doubly magic Ni-78 core for nuclei beyond N = 50. The experimental evidence is supported by spherical HFB calculations using the SkO(T) functional involving the tensor term in the nucleon-nucleon interaction.

引用

页数：7

共 30 条

[1] Al-Khalili J, 2004, LECT NOTES PHYS, P77
[2] DARBY IG, 2010, ENAM 2008 C RYN POL
[3] Shell structure of exotic nuclei
Dobaczewski, J.
Michel, N.
Nazarewicz, W.
Ploszajczak, M.
Rotureau, J.
[J]. PROGRESS IN PARTICLE AND NUCLEAR PHYSICS VOL 59, NO 1, 2007, 59 (01): : 432 - 445
[4] Gross CJ, 2009, ACTA PHYS POL B, V40, P447
[5] A novel way of doing decay spectroscopy at a radioactive ion beam facility
Gross, CJ
Rykaczewski, KP
Shapira, D
Winger, JA
Batchelder, JC
Bingham, CR
Grzywacz, RK
Hausladen, PA
Krolas, W
Mazzocchi, C
Piechaczek, A
Zganjar, EF
[J]. EUROPEAN PHYSICAL JOURNAL A, 2005, 25 : 115 - 116
[6] Applications of digital pulse processing in nuclear spectroscopy
Grzywacz, R
[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 2003, 204 : 649 - 659
[7] HILL JC, 1988, AIP C P, V164, P375
[8] Study of the N=50 shell closure close to 78Ni
Ibrahim, F
Perru, O
Bajeat, O
Bourgeois, C
Clapier, F
Cottereau, E
Donzaud, C
Du, S
Ducourtieux, M
Essabaa, S
Galès, S
Gaudefroy, L
Guillemaud-Mueller, D
Hammache, F
Hosni, F
Lau, C
Lefort, H
Le Blanc, F
Mueller, AC
Pauwels, N
Potier, JC
Pougheon, F
Proust, J
Roussière, B
Sauvage, J
Sorlin, O
[J]. BRAZILIAN JOURNAL OF PHYSICS, 2004, 34 (3A) : 979 - 982
[9] β decay of the πf5/2 ground state of 77Cu studied with 225 MeV and 0.2 MeV purified radioactive beams
Ilyushkin, S. V.
Winger, J. A.
Gross, C. J.
Rykaczewski, K. P.
Batchelder, J. C.
Cartegni, L.
Darby, I. G.
Goodin, C.
Grzywacz, R.
Hamilton, J. H.
Korgul, A.
Krolas, W.
Liddick, S. N.
Mazzocchi, C.
Padgett, S.
Piechaczek, A.
Rajabali, M. M.
Shapira, D.
Zganjar, E. F.
[J]. PHYSICAL REVIEW C, 2009, 80 (05):
[10] Shell structure beyond the proton drip line studied via proton emission from deformed 141Ho
Karny, M.
Rykaczewski, K. P.
Grzywacz, R. K.
Batchelder, J. C.
Bingham, C. R.
Goodin, C.
Gross, C. J.
Hamilton, J. H.
Korgul, A.
Krolas, W.
Liddick, S. N.
Li, K.
Maier, K. H.
Mazzocchi, C.
Piechaczek, A.
Rykaczewski, K.
Schapira, D.
Simpson, D.
Tantawy, M. N.
Winger, J. A.
Yu, C. H.
Zganjar, E. F.
Nikolov, N.
Dobaczewski, J.
Kruppa, A. T.
Nazarewicz, W.
Stoitsov, M. V.
[J]. PHYSICS LETTERS B, 2008, 664 (1-2) : 52 - 56

← 1 2 3 →