Decay of neutron deficient Eu, Sm and Pm isotopes near the proton drip line

K. S. Vierinen, J. M. Nitschke, Phillip Wilmarth, R. B. Firestone, J. Gilat

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The β-delayed proton and γ-ray decays of the two new isotopes 134,135Eu and of 136Eu, 134,135,136Sm, 134,135,136Pm and 135Nd were studied This is the flrst observation of β-delayed proton decay in europium isotopes. On-line mass separation and X-ray coincidences were used for isotope identification. Half-lives of 0.5 ±0.2 s and 1.5 ±0.2 s were measured for 134Eu and 135Eu respectively. For 136Eu evidence for two isomers with half-lives of 3.7 ±0.3 s and ~3.0 s was obtained. Betadelayed proton emission was assigned to the decays of 134Eu, 135Sm and 136Eu based on proton K X-ray coincidences and mass separation. Proton branching ratios of (9±3) × 10-4 for 136Eu and (2±1) × 10-4 for 135Sm were measured. Beta-delayed proton emission to the 0+ ground and to the 2+ excited states in 134Nd was observed following the 135Sm decay. The 135Eu activity was identified by Sm Kα X-rays from its electron-capture decay, and one γ-ray was assigned to this decay. Fast allowed Gamow-Teller 0+ → 1+ β-transitions to the 118.9keV level in 134Pm and 114.4keV level in 136Pm were identified. The low-spin β-decays of 136Pm and 135Nd were studied without significant interference from the high-spin decays, and decay schemes were constructed for 134,135,136Sm, 134,135,136pm and 136Eu.

Original languageEnglish (US)
Pages (from-to)1-28
Number of pages28
JournalNuclear Physics, Section A
Volume499
Issue number1
DOIs
StatePublished - Jul 17 1989
Externally publishedYes

Fingerprint

isotopes
neutrons
protons
decay
half life
europium isotopes
rays
x rays
electron capture
isomers
interference
excitation

Keywords

  • RADIOACTIVITY

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Decay of neutron deficient Eu, Sm and Pm isotopes near the proton drip line. / Vierinen, K. S.; Nitschke, J. M.; Wilmarth, Phillip; Firestone, R. B.; Gilat, J.

In: Nuclear Physics, Section A, Vol. 499, No. 1, 17.07.1989, p. 1-28.

Research output: Contribution to journalArticle

Vierinen, K. S. ; Nitschke, J. M. ; Wilmarth, Phillip ; Firestone, R. B. ; Gilat, J. / Decay of neutron deficient Eu, Sm and Pm isotopes near the proton drip line. In: Nuclear Physics, Section A. 1989 ; Vol. 499, No. 1. pp. 1-28.
@article{011b11cb54ab4f7dbc21985b048d74ac,
title = "Decay of neutron deficient Eu, Sm and Pm isotopes near the proton drip line",
abstract = "The β-delayed proton and γ-ray decays of the two new isotopes 134,135Eu and of 136Eu, 134,135,136Sm, 134,135,136Pm and 135Nd were studied This is the flrst observation of β-delayed proton decay in europium isotopes. On-line mass separation and X-ray coincidences were used for isotope identification. Half-lives of 0.5 ±0.2 s and 1.5 ±0.2 s were measured for 134Eu and 135Eu respectively. For 136Eu evidence for two isomers with half-lives of 3.7 ±0.3 s and ~3.0 s was obtained. Betadelayed proton emission was assigned to the decays of 134Eu, 135Sm and 136Eu based on proton K X-ray coincidences and mass separation. Proton branching ratios of (9±3) × 10-4 for 136Eu and (2±1) × 10-4 for 135Sm were measured. Beta-delayed proton emission to the 0+ ground and to the 2+ excited states in 134Nd was observed following the 135Sm decay. The 135Eu activity was identified by Sm Kα X-rays from its electron-capture decay, and one γ-ray was assigned to this decay. Fast allowed Gamow-Teller 0+ → 1+ β-transitions to the 118.9keV level in 134Pm and 114.4keV level in 136Pm were identified. The low-spin β-decays of 136Pm and 135Nd were studied without significant interference from the high-spin decays, and decay schemes were constructed for 134,135,136Sm, 134,135,136pm and 136Eu.",
keywords = "RADIOACTIVITY",
author = "Vierinen, {K. S.} and Nitschke, {J. M.} and Phillip Wilmarth and Firestone, {R. B.} and J. Gilat",
year = "1989",
month = "7",
day = "17",
doi = "10.1016/0375-9474(89)90266-2",
language = "English (US)",
volume = "499",
pages = "1--28",
journal = "Nuclear Physics A",
issn = "0375-9474",
publisher = "Elsevier",
number = "1",

}

TY - JOUR

T1 - Decay of neutron deficient Eu, Sm and Pm isotopes near the proton drip line

AU - Vierinen, K. S.

AU - Nitschke, J. M.

AU - Wilmarth, Phillip

AU - Firestone, R. B.

AU - Gilat, J.

PY - 1989/7/17

Y1 - 1989/7/17

N2 - The β-delayed proton and γ-ray decays of the two new isotopes 134,135Eu and of 136Eu, 134,135,136Sm, 134,135,136Pm and 135Nd were studied This is the flrst observation of β-delayed proton decay in europium isotopes. On-line mass separation and X-ray coincidences were used for isotope identification. Half-lives of 0.5 ±0.2 s and 1.5 ±0.2 s were measured for 134Eu and 135Eu respectively. For 136Eu evidence for two isomers with half-lives of 3.7 ±0.3 s and ~3.0 s was obtained. Betadelayed proton emission was assigned to the decays of 134Eu, 135Sm and 136Eu based on proton K X-ray coincidences and mass separation. Proton branching ratios of (9±3) × 10-4 for 136Eu and (2±1) × 10-4 for 135Sm were measured. Beta-delayed proton emission to the 0+ ground and to the 2+ excited states in 134Nd was observed following the 135Sm decay. The 135Eu activity was identified by Sm Kα X-rays from its electron-capture decay, and one γ-ray was assigned to this decay. Fast allowed Gamow-Teller 0+ → 1+ β-transitions to the 118.9keV level in 134Pm and 114.4keV level in 136Pm were identified. The low-spin β-decays of 136Pm and 135Nd were studied without significant interference from the high-spin decays, and decay schemes were constructed for 134,135,136Sm, 134,135,136pm and 136Eu.

AB - The β-delayed proton and γ-ray decays of the two new isotopes 134,135Eu and of 136Eu, 134,135,136Sm, 134,135,136Pm and 135Nd were studied This is the flrst observation of β-delayed proton decay in europium isotopes. On-line mass separation and X-ray coincidences were used for isotope identification. Half-lives of 0.5 ±0.2 s and 1.5 ±0.2 s were measured for 134Eu and 135Eu respectively. For 136Eu evidence for two isomers with half-lives of 3.7 ±0.3 s and ~3.0 s was obtained. Betadelayed proton emission was assigned to the decays of 134Eu, 135Sm and 136Eu based on proton K X-ray coincidences and mass separation. Proton branching ratios of (9±3) × 10-4 for 136Eu and (2±1) × 10-4 for 135Sm were measured. Beta-delayed proton emission to the 0+ ground and to the 2+ excited states in 134Nd was observed following the 135Sm decay. The 135Eu activity was identified by Sm Kα X-rays from its electron-capture decay, and one γ-ray was assigned to this decay. Fast allowed Gamow-Teller 0+ → 1+ β-transitions to the 118.9keV level in 134Pm and 114.4keV level in 136Pm were identified. The low-spin β-decays of 136Pm and 135Nd were studied without significant interference from the high-spin decays, and decay schemes were constructed for 134,135,136Sm, 134,135,136pm and 136Eu.

KW - RADIOACTIVITY

UR - http://www.scopus.com/inward/record.url?scp=0002083420&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0002083420&partnerID=8YFLogxK

U2 - 10.1016/0375-9474(89)90266-2

DO - 10.1016/0375-9474(89)90266-2

M3 - Article

AN - SCOPUS:0002083420

VL - 499

SP - 1

EP - 28

JO - Nuclear Physics A

JF - Nuclear Physics A

SN - 0375-9474

IS - 1

ER -