Penning trap mass spectrometry of neutron-rich Fe and Co isotopes around N=40 with the LEBIT mass spectrometer

被引：35

作者：

Ferrer, R. ^{[1
]}

Block, M. ^{[1
]}

Bachelet, C. ^{[1
]}

Barquest, B. R. ^{[1
,2
]}

Bollen, G. ^{[1
,2
]}

Campbell, C. M. ^{[1
]}

Facina, M. ^{[1
]}

Folden, C. M., III ^{[1
]}

Guenaut, C. ^{[1
]}

Kwiatkowski, A. A. ^{[1
,2
]}

Lincoln, D. L. ^{[1
,2
]}

Morrissey, D. J. ^{[1
,3
]}

Pang, G. K. ^{[1
,3
]}

Prinke, A. M. ^{[1
,2
]}

Ringle, R. ^{[1
,2
]}

Savory, J. ^{[1
,2
]}

Schury, P. ^{[1
,2
]}

Schwarz, S. ^{[1
]}

机构：

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

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

[3] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA

来源：

PHYSICAL REVIEW C | 2010年 / 81卷 / 04期

基金：

美国国家科学基金会;

关键词：

NUCLEAR; ION; DEFORMATION; QUADRUPOLE; ELECTRON; CLOSURE; PHYSICS; ISLAND; DECAY;

D O I：

10.1103/PhysRevC.81.044318

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：

Penning trap mass spectrometry is presented as a complementary tool to nuclear spectroscopy experiments for the study of nuclear structure in the vicinity of N = 40, Z = 28. High-precision mass measurements of the Fe63-66 and Co64-67 isotopes have been carried out with the Low Energy Beam and Ion Trap (LEBIT) Penning trap mass spectrometer. The newly obtained mass values for Fe-66 and Co-67 are presented, together with the previously reported LEBIT mass measurements in this region. In the case of Fe-65 the existence of a new isomer is reported, and an isomer recently discovered by decay spectroscopy in Co-67 is confirmed. Relative mass uncertainties as low as 4 x 10(-8) are obtained. All mass values are found to be in good agreement with previous experimental results with the exception of Co-64, where a 5 sigma deviation is observed. Using these data the two neutron separation energies S-2n are calculated. However, the large error bars in the mass values of the neighbor Fe and Co isotopes with N > 40 complicate the validation of a weak subshell closure at N = 40 for the Co isotopes or the possible reduction in the neutron shell gap in the case of the Fe isotopes, in accordance with the theoretical predictions of an onset of deformation in the region.

引用

页数：9

共 61 条

[1] NUCLEAR-MASS FORMULA VIA AN APPROXIMATION TO THE HARTREE-FOCK METHOD [J].

ABOUSSIR, Y ;

PEARSON, JM ;

DUTTA, AK ;

TONDEUR, F .

ATOMIC DATA AND NUCLEAR DATA TABLES, 1995, 61 (01) :127-176

[2] In-beam γ-ray spectroscopy and inclusive two-proton knockout cross section measurements at N ≈ 40 [J].

Adrich, P. ;

Amthor, A. M. ;

Bazin, D. ;

Bowen, M. D. ;

Brown, B. A. ;

Campbell, C. M. ;

Cook, J. M. ;

Gade, A. ;

Galaviz, D. ;

Glasmacher, T. ;

McDaniel, S. ;

Miller, D. ;

Obertelli, A. ;

Shimbara, Y. ;

Siwek, K. P. ;

Tostevin, J. A. ;

Weisshaar, D. .

PHYSICAL REVIEW C, 2008, 77 (05)

[3] Shape transition observed in neutron-rich pf-shell isotopes studied via proton inelastic scattering [J].

Aoi, N. ;

Suzuki, H. ;

Takeshita, E. ;

Takeuchi, S. ;

Ota, S. ;

Baba, H. ;

Bishop, S. ;

Fukui, T. ;

Hashimoto, Y. ;

Ong, H. J. ;

Ideguchi, E. ;

Ieki, K. ;

Imai, N. ;

Iwasaki, H. ;

Kanno, S. ;

Kondo, Y. ;

Kubo, T. ;

Kurita, K. ;

Kusaka, K. ;

Minemura, T. ;

Motobayashi, T. ;

Nakabayashi, T. ;

Nakamura, T. ;

Nakao, T. ;

Niikura, M. ;

Okumura, T. ;

Ohnishi, T. K. ;

Sakurai, H. ;

Shimoura, S. ;

Sugo, R. ;

Suzuki, D. ;

Suzuki, M. K. ;

Tamaki, M. ;

Tanaka, K. ;

Togano, Y. ;

Yamada, K. .

NUCLEAR PHYSICS A, 2008, 805 :400C-407C

[4] The AME2003 atomic mass evaluation (II). Tables, graphs and references [J].

Audi, G ;

Wapstra, AH ;

Thibault, C .

NUCLEAR PHYSICS A, 2003, 729 (01) :337-676

[5] 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

[6]

AUDI G, 2009, COMMUNICATION

[7] Mass measurement in the fp-shell using the TOFI spectrometer [J].

Bai, Y ;

Vieira, DJ ;

Seifert, HL ;

Wouters, JM .

ENAM 98: EXOTIC NUCLEI AND ATOMIC MASSES, 1998, 455 :90-93

[8] MAGIC FEATURES OF NI-68 [J].

BERNAS, M ;

DESSAGNE, P ;

LANGEVIN, M ;

PAYET, J ;

POUGHEON, F ;

ROUSSEL, P .

PHYSICS LETTERS B, 1982, 113 (04) :279-282

[9] The calculation of errors by the method of least squares [J].

Birge, RT .

PHYSICAL REVIEW, 1932, 40 (02) :207-227

[10] High-accuracy mass spectrometry with stored ions [J].

Blaum, K .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2006, 425 (01) :1-78

← 1 2 3 4 5 6 7 →