β-decay studies of 135-137Sn using selective resonance laser ionization techniques -: art. no. 034313

被引：82

作者：

Shergur, J ^{[1
]}

Brown, BA

Fedoseyev, V

Köster, U

Kratz, KL

Sweryniak, D

Walters, WB

Wöhr, A

Fedorov, D

Hannawald, M

Hjorth-Jensen, M

Mishin, V

Pfeiffer, B

Ressler, JJ

Fynbo, HOU

Hoff, P

Mach, H

Nilsson, T

Wilhelmsen-Rolander, K

Simon, H

Bickley, A

机构：

[1] Univ Maryland, Dept Chem, College Pk, MD 20742 USA

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

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

[4] Russian Acad Sci, Inst Spect, RU-142092 Troitsk, Russia

[5] CERN, ISOLDE, Expt Phys Div, CH-1211 Geneva 23, Switzerland

[6] Johannes Gutenberg Univ Mainz, Inst Kernchem, D-55099 Mainz, Germany

[7] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA

[8] Russian Acad Sci, Petersburg Nucl Phys Inst, Gatchina 188350, Russia

[9] Univ Oslo, Dept Phys, NO-0316 Oslo, Norway

[10] Univ Oslo, Dept Chem, NO-1163 Oslo, Norway

[11] Uppsala Univ, Dept Neutron Res, S-61182 Nykoping, Sweden

[12] Univ Stockholm, Dept Phys, S-11385 Stockholm, Sweden

来源：

PHYSICAL REVIEW C | 2002年 / 65卷 / 03期

关键词：

D O I：

10.1103/PhysRevC.65.034313

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 decays of the very neutron rich Sn isotopes Sn135-137 were studied at CERN/ISOLDE using isotopic and isobaric selectivity achieved by the use of a resonance ionization laser ion source and mass spectroscopy, respectively. Neutron decay rates, gamma-ray singles, and gamma-gamma coincidence data were collected as a function of time. The half-life (T-1/2) and delayed neutron emission probability (P-n) values of 135 Sn were measured to be 530(20) ms and 21(3)%, respectively. For Sn-136, a T-1/2 of 250(30) ms was determined along with a P-n value of 30(5)%. For Sn-137, a T-1/2 of 190(60) ms and a P-n value of 58(15)% were deduced. Identification of low-energy transitions in Sb-135 was made possible by comparison of laser-on and laser-off gamma-ray spectra. Those data combined with gamma-gamma coincidence spectra were used to construct a level scheme for Sb-135 that includes an unexpectedly low first excited state at 282 keV. A ground state beta branch of 33.2% was measured by following the growth and decay of the Sb-135 daughter. Shell-model calculations are consistent with the observed Sb-135 level structure and can account for a lowered first excited state.

引用

页数：9

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