Evidence for a doubly magic 24O

被引：171

作者：

Hoffman, C. R. ^{[1
]}

Baumann, T. ^{[2
]}

Bazin, D. ^{[2
]}

Brown, J. ^{[3
]}

Christian, G. ^{[2
,4
]}

Denby, D. H. ^{[5
]}

DeYoung, P. A. ^{[5
]}

Finck, J. E. ^{[6
]}

Frank, N. ^{[2
,4
]}

Hinnefeld, J. ^{[7
]}

Mosby, S. ^{[8
]}

Peters, W. A. ^{[2
,4
]}

Rogers, W. F. ^{[7
,8
]}

Schiller, A. ^{[2
]}

Spyrou, A. ^{[2
]}

Scott, M. J. ^{[6
]}

Tabor, S. L. ^{[1
]}

Thoennessen, M. ^{[2
,4
]}

Voss, P. ^{[6
]}

机构：

[1] Florida State Univ, Dept Phys, Tallahassee, FL 32303 USA

[2] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

[3] Wabash Coll, Dept Phys, Crawfordsville, IN 47933 USA

[4] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[5] Hope Coll, Dept Phys, Holland, MI 49423 USA

[6] Cent Michigan Univ, Dept Phys, Mt Pleasant, MI 48859 USA

[7] Indiana Univ, Dept Phys & Astron, South Bend, IN 46634 USA

[8] Westmont Coll, Dept Phys, Santa Barbara, CA 93108 USA

来源：

PHYSICS LETTERS B | 2009年 / 672卷 / 01期

基金：

美国国家科学基金会;

关键词：

Neutron spectroscopy; Exotic nuclei; Magic numbers; Shell gap; SHELL-MODEL; DRIP-LINE; NUCLEAR;

D O I：

10.1016/j.physletb.2008.12.066

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The decay energy spectrum for neutron unbound states in O-24 (Z = 8, N = 16) has been observed for the first time. The resonance energy of the lowest lying state, interpreted as the 2(+) level, has been observed at a decay energy above 600 keV. The resulting excitation energy of the 2(+) level above 4.7 MeV. supplies strong evidence that O-24 is a doubly magic nucleus. The data is also consistent with the presence of a second excited state around 5.33 MeV which can be interpreted as the 1(+) level. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：17 / 21

页数：5

共 23 条

[1] The NUBASE evaluation of nuclear and decay properties [J].

Audi, G ;

Bersillon, O ;

Blachot, J ;

Wapstra, AH .

NUCLEAR PHYSICS A, 2003, 729 (01) :3-128

[2] Construction of a modular large-area neutron detector for the NSCL [J].

Baumann, T ;

Boike, J ;

Brown, J ;

Bullinger, M ;

Bychoswki, JP ;

Clark, S ;

Daum, K ;

DeYoung, PA ;

Evans, JV ;

Finck, J ;

Frank, N ;

Grant, A ;

Hinnefeld, J ;

Hitt, GW ;

Howes, RH ;

Isselhardt, B ;

Kemper, KW ;

Longacre, J ;

Lu, Y ;

Luther, B ;

Marley, ST ;

McCollum, D ;

McDonald, E ;

Onwuemene, U ;

Pancella, PV ;

Peaslee, GF ;

Peters, WA ;

Rajabali, M ;

Robertson, J ;

Rogers, WF ;

Tabor, SL ;

Thoennessen, M ;

Tryggestad, E ;

Turner, RE ;

VanWylen, PJ ;

Walker, N .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2005, 543 (2-3) :517-527

[3] System testing and installation of the NHMFL/NSCL sweeper magnet [J].

Bird, MD ;

Kenney, SJ ;

Toth, J ;

Weijers, HW ;

DeKamp, JC ;

Thoennessen, M ;

Zeller, AF .

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 2005, 15 (02) :1252-1254

[4]

Bohr A., 1998, NUCL STRUCTURE, V1, P441

[5] New "USD" Hamiltonians for the sd shell [J].

Brown, B. Alex ;

Richter, W. A. .

PHYSICAL REVIEW C, 2006, 74 (03)

[6] Magic numbers in the neutron-rich oxygen isotopes [J].

Brown, BA ;

Richter, WA .

PHYSICAL REVIEW C, 2005, 72 (05)

[7]

BROWN BA, 1988, ANNU REV NUCL PART S, V38, P29

[8] Determination of the n=16 shell closure at the oxygen drip line [J].

Hoffman, C. R. ;

Baumann, T. ;

Bazin, D. ;

Brown, J. ;

Christian, G. ;

DeYoung, P. A. ;

Finck, J. E. ;

Frank, N. ;

Hinnefeld, J. ;

Howes, R. ;

Mears, P. ;

Mosby, E. ;

Mosby, S. ;

Reith, J. ;

Rizzo, B. ;

Rogers, W. F. ;

Peaslee, G. ;

Peters, W. A. ;

Schiller, A. ;

Scott, M. J. ;

Tabor, S. L. ;

Thoennessen, M. ;

Voss, P. J. ;

Williams, T. .

PHYSICAL REVIEW LETTERS, 2008, 100 (15)

[9] Mass measurements of neutron-rich nuclei near the N=20 and 28 shell closures [J].

Jurado, B. ;

Savajols, H. ;

Mittig, W. ;

Orr, N. A. ;

Roussel-Chomaz, P. ;

Baiborodin, D. ;

Catford, W. N. ;

Chartier, M. ;

Demonchy, C. E. ;

Dlouhy, Z. ;

Gillibert, A. ;

Giot, L. ;

Khouaja, A. ;

Lepine-Szily, A. ;

Lukyanov, S. ;

Mrazek, J. ;

Penionzhkevich, Y. E. ;

Pita, S. ;

Rousseau, M. ;

Villari, A. C. .

PHYSICS LETTERS B, 2007, 649 (01) :43-48

[10] Continuum quasiparticle random phase approximation and the time-dependent Hartree-Fock-Bogoliubov approach [J].

Khan, E ;

Sandulescu, N ;

Grasso, M ;

Van Giai, N .

PHYSICAL REVIEW C, 2002, 66 (02) :243091-243099

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