Experimental identification of spin-parities and single-particle configurations in No257 and its α-decay daughter Fm253

M. Asai; K. Tsukada; M. Sakama; S. Ichikawa; T. Ishii; Y. Nagame; I. Nishinaka; K. Akiyama; A. Osa; Y. Oura; K. Sueki; M. Shibata

doi:10.1103/PhysRevLett.95.102502

Experimental identification of spin-parities and single-particle configurations in No257 and its α-decay daughter Fm253

M. Asai, K. Tsukada, M. Sakama, S. Ichikawa, T. Ishii, Y. Nagame, I. Nishinaka, K. Akiyama, A. Osa, Y. Oura, K. Sueki, M. Shibata

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Abstract

α-γ and α-electron coincidence spectroscopy for a short-lived heavy actinide nucleus No257 (T1/2=24.5s) has been performed using a gas-jet transport system and an on-line isotope separator. Spin-parities of excited states in Fm253 fed by the α decay of No257 have been identified on the basis of the measured internal conversion coefficients. The ν3/2+[622] configuration has been assigned to the ground state of No257 as well as to the 124.1 keV level in Fm253. It was found that the ground-state configuration of No257 is different from that of lighter N=155 isotones.

Original language	English
Article number	102502
Journal	Physical review letters
Volume	95
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.95.102502
Publication status	Published - Sept 2 2005
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.95.102502

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title = "Experimental identification of spin-parities and single-particle configurations in No257 and its α-decay daughter Fm253",

abstract = "α-γ and α-electron coincidence spectroscopy for a short-lived heavy actinide nucleus No257 (T1/2=24.5s) has been performed using a gas-jet transport system and an on-line isotope separator. Spin-parities of excited states in Fm253 fed by the α decay of No257 have been identified on the basis of the measured internal conversion coefficients. The ν3/2+[622] configuration has been assigned to the ground state of No257 as well as to the 124.1 keV level in Fm253. It was found that the ground-state configuration of No257 is different from that of lighter N=155 isotones.",

author = "M. Asai and K. Tsukada and M. Sakama and S. Ichikawa and T. Ishii and Y. Nagame and I. Nishinaka and K. Akiyama and A. Osa and Y. Oura and K. Sueki and M. Shibata",

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T1 - Experimental identification of spin-parities and single-particle configurations in No257 and its α-decay daughter Fm253

AU - Asai, M.

AU - Tsukada, K.

AU - Sakama, M.

AU - Ichikawa, S.

AU - Ishii, T.

AU - Nagame, Y.

AU - Nishinaka, I.

AU - Akiyama, K.

AU - Osa, A.

AU - Oura, Y.

AU - Sueki, K.

AU - Shibata, M.

PY - 2005/9/2

Y1 - 2005/9/2

N2 - α-γ and α-electron coincidence spectroscopy for a short-lived heavy actinide nucleus No257 (T1/2=24.5s) has been performed using a gas-jet transport system and an on-line isotope separator. Spin-parities of excited states in Fm253 fed by the α decay of No257 have been identified on the basis of the measured internal conversion coefficients. The ν3/2+[622] configuration has been assigned to the ground state of No257 as well as to the 124.1 keV level in Fm253. It was found that the ground-state configuration of No257 is different from that of lighter N=155 isotones.

AB - α-γ and α-electron coincidence spectroscopy for a short-lived heavy actinide nucleus No257 (T1/2=24.5s) has been performed using a gas-jet transport system and an on-line isotope separator. Spin-parities of excited states in Fm253 fed by the α decay of No257 have been identified on the basis of the measured internal conversion coefficients. The ν3/2+[622] configuration has been assigned to the ground state of No257 as well as to the 124.1 keV level in Fm253. It was found that the ground-state configuration of No257 is different from that of lighter N=155 isotones.

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Experimental identification of spin-parities and single-particle configurations in No257 and its α-decay daughter Fm253

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