N=14 and 16 shell gaps in neutron-rich oxygen isotopes -: art. no. 034312

被引：202

作者：

Stanoiu, M

Azaiez, F

Dombrádi, Z

Sorlin, O

Brown, BA

Belleguic, M

Sohler, D

Saint Laurent, MG

Lopez-Jimenez, MJ

Penionzhkevich, YE

Sletten, G

Achouri, NL

Angélique, JC

Becker, F

Borcea, C

Bourgeois, C

Bracco, A

Daugas, JM

Dlouhy, Z

Donzaud, C

Duprat, J

Fülöp, Z

Guillemaud-Mueller, D

Grévy, S

Ibrahim, F

Kerek, A

Krasznahorkay, A

Lewitowicz, M

Leenhardt, S

Lukyanov, S

Mayet, P

Mandal, S

van der Marel, H

Mittig, W

Mrázek, J

Negoita, F

De Oliveira-Santos, F

Podolyák, Z

Pougheon, F

Porquet, MG

Roussel-Chomaz, P

Savajols, H

Sobolev, Y

Stodel, C

Timár, J

Yamamoto, A

机构：

[1] GANIL, F-14076 Caen 5, France

[2] Inst Phys Nucl, IN2P3, CNRS, F-91406 Orsay, France

[3] Univ Paris 11, F-91406 Orsay, France

[4] Inst Nucl Res, H-4001 Debrecen, Hungary

[5] Michigan State Univ, NSCL, E Lansing, MI 48824 USA

[6] Joint Inst Nucl Res, FLNR, Dubna 141980, Moscow Region, Russia

[7] Inst Sci Mat & Rayonnement, LPC, IN2P3, CNRS, F-14050 Caen, France

[8] Univ Caen, F-14050 Caen, France

[9] IFIN HH, Bucharest 76900, Romania

[10] Univ Milan, Dipartimento Fis, I-20122 Milan, Italy

[11] Ist Nazl Fis Nucl, Sez Milano, Milan, Italy

[12] Acad Sci Czech Republ, Inst Nucl Phys, CZ-25068 Rez, Czech Republic

[13] AlbaNova Univ Ctr, Royal Inst Technol, S-10691 Stockholm, Sweden

[14] GSI Darmstadt, D-64220 Darmstadt, Germany

[15] Univ Surrey, Dept Phys, Guildford GU2 5XH, Surrey, England

[16] CNRS, IN2P3, CSNSM, F-91405 Orsay, France

[17] Univ Paris 11, F-91405 Orsay, France

[18] Niels Bohr Inst, DK-2100 Copenhagen, Denmark

来源：

PHYSICAL REVIEW C | 2004年 / 69卷 / 03期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevC.69.034312

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：

In-beam gamma-ray spectroscopy using fragmentation reactions of both stable and radioactive beams has been performed in order to study the structure of excited states in neutron-rich oxygen isotopes with masses ranging from A=20 to 24. For the produced fragments, gamma-ray energies, intensities, and gamma-gamma coincidences have been measured. Based on this information new level schemes are proposed for O-21,O-22 up to the neutron separation energy. The nonobservation of any gamma-decay branch from O-23 and O-24 suggests that their excited states lie above the neutron decay thresholds. From this, as well as from the level schemes proposed for O-21 and O-22, the size of the N=14 and 16 shell gaps in oxygen isotopes is discussed in the light of shell-model calculations.

引用

页码：034312 / 1

页数：10

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