QEC Measurement of 124,125,127-130La

Yasuaki Kojima; Masato Asai; Akihiko Osa; Mitsuo Koizumi; Toshiaki Sekine; Michihiro Shibata; Hiroshi Yamamoto; Kiyoshi Kawade; Takahiro Tachibana

doi:10.1143/JPSJ.67.3405

Q_EC Measurement of ^{124,125,127-130}La

Yasuaki Kojima, Masato Asai, Akihiko Osa, Mitsuo Koizumi, Toshiaki Sekine, Michihiro Shibata, Hiroshi Yamamoto, Kiyoshi Kawade, Takahiro Tachibana

Waseda University Senior High School

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

For neutron-deficient ^{124,125,127-130}La, Q_EC measurement has been performed by determining β⁺-ray maximum energies. The radioactive sources were prepared by on-line mass-separation following the fusion-evaporation reactions ^92,natMo(³⁶Ar, 3pxn). The β⁺-rays were measured with an HPGe detector in β - γ coincidence mode in which γ-rays were detected with another HPGe detector for specifying an excited state in daughter nucleus. By unfolding the β⁺-ray spectra using experimental response functions, the Q_EC-values of ^{124,125,127,130}La were newly obtained, and those of ^128,129La were improved in their accuracy. The Q_EC-values obtained and the resulting atomic masses are compared with theoretical predictions. The results of half-life calculation and two-neutron separation energies using the experimental Q_EC-values are also discussed.

Original language	English
Pages (from-to)	3405-3413
Number of pages	9
Journal	journal of the physical society of japan
Volume	67
Issue number	10
DOIs	https://doi.org/10.1143/JPSJ.67.3405
Publication status	Published - 1998 Oct

Keywords

E = 5.4 MeV/u]
HPGe
La[from Mo(Ar, 3pxn)
La[from Mo(Ar, 3pxn)
Measured Q
Radioactivity
β - γ coincidence

ASJC Scopus subject areas

Physics and Astronomy(all)

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@article{685bfbfb59714441adb8f2efca8613bc,

title = "QEC Measurement of 124,125,127-130La",

abstract = "For neutron-deficient 124,125,127-130La, QEC measurement has been performed by determining β+-ray maximum energies. The radioactive sources were prepared by on-line mass-separation following the fusion-evaporation reactions 92,natMo(36Ar, 3pxn). The β+-rays were measured with an HPGe detector in β - γ coincidence mode in which γ-rays were detected with another HPGe detector for specifying an excited state in daughter nucleus. By unfolding the β+-ray spectra using experimental response functions, the QEC-values of 124,125,127,130La were newly obtained, and those of 128,129La were improved in their accuracy. The QEC-values obtained and the resulting atomic masses are compared with theoretical predictions. The results of half-life calculation and two-neutron separation energies using the experimental QEC-values are also discussed.",

keywords = "E = 5.4 MeV/u], HPGe, La[from Mo(Ar, 3pxn), La[from Mo(Ar, 3pxn), Measured Q, Radioactivity, β - γ coincidence",

author = "Yasuaki Kojima and Masato Asai and Akihiko Osa and Mitsuo Koizumi and Toshiaki Sekine and Michihiro Shibata and Hiroshi Yamamoto and Kiyoshi Kawade and Takahiro Tachibana",

year = "1998",

month = oct,

doi = "10.1143/JPSJ.67.3405",

language = "English",

volume = "67",

pages = "3405--3413",

journal = "Journal of the Physical Society of Japan",

issn = "0031-9015",

publisher = "Physical Society of Japan",

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TY - JOUR

T1 - QEC Measurement of 124,125,127-130La

AU - Kojima, Yasuaki

AU - Asai, Masato

AU - Osa, Akihiko

AU - Koizumi, Mitsuo

AU - Sekine, Toshiaki

AU - Shibata, Michihiro

AU - Yamamoto, Hiroshi

AU - Kawade, Kiyoshi

AU - Tachibana, Takahiro

PY - 1998/10

Y1 - 1998/10

N2 - For neutron-deficient 124,125,127-130La, QEC measurement has been performed by determining β+-ray maximum energies. The radioactive sources were prepared by on-line mass-separation following the fusion-evaporation reactions 92,natMo(36Ar, 3pxn). The β+-rays were measured with an HPGe detector in β - γ coincidence mode in which γ-rays were detected with another HPGe detector for specifying an excited state in daughter nucleus. By unfolding the β+-ray spectra using experimental response functions, the QEC-values of 124,125,127,130La were newly obtained, and those of 128,129La were improved in their accuracy. The QEC-values obtained and the resulting atomic masses are compared with theoretical predictions. The results of half-life calculation and two-neutron separation energies using the experimental QEC-values are also discussed.

AB - For neutron-deficient 124,125,127-130La, QEC measurement has been performed by determining β+-ray maximum energies. The radioactive sources were prepared by on-line mass-separation following the fusion-evaporation reactions 92,natMo(36Ar, 3pxn). The β+-rays were measured with an HPGe detector in β - γ coincidence mode in which γ-rays were detected with another HPGe detector for specifying an excited state in daughter nucleus. By unfolding the β+-ray spectra using experimental response functions, the QEC-values of 124,125,127,130La were newly obtained, and those of 128,129La were improved in their accuracy. The QEC-values obtained and the resulting atomic masses are compared with theoretical predictions. The results of half-life calculation and two-neutron separation energies using the experimental QEC-values are also discussed.

KW - E = 5.4 MeV/u]

KW - HPGe

KW - La[from Mo(Ar, 3pxn)

KW - Measured Q

KW - Radioactivity

KW - β - γ coincidence

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