First Measurement of Several β-Delayed Neutron Emitting Isotopes Beyond N=126.

نویسندگان

  • R Caballero-Folch
  • C Domingo-Pardo
  • J Agramunt
  • A Algora
  • F Ameil
  • A Arcones
  • Y Ayyad
  • J Benlliure
  • I N Borzov
  • M Bowry
  • F Calviño
  • D Cano-Ott
  • G Cortés
  • T Davinson
  • I Dillmann
  • A Estrade
  • A Evdokimov
  • T Faestermann
  • F Farinon
  • D Galaviz
  • A R García
  • H Geissel
  • W Gelletly
  • R Gernhäuser
  • M B Gómez-Hornillos
  • C Guerrero
  • M Heil
  • C Hinke
  • R Knöbel
  • I Kojouharov
  • J Kurcewicz
  • N Kurz
  • Yu A Litvinov
  • L Maier
  • J Marganiec
  • T Marketin
  • M Marta
  • T Martínez
  • G Martínez-Pinedo
  • F Montes
  • I Mukha
  • D R Napoli
  • C Nociforo
  • C Paradela
  • S Pietri
  • Zs Podolyák
  • A Prochazka
  • S Rice
  • A Riego
  • B Rubio
  • H Schaffner
  • Ch Scheidenberger
  • K Smith
  • E Sokol
  • K Steiger
  • B Sun
  • J L Taín
  • M Takechi
  • D Testov
  • H Weick
  • E Wilson
  • J S Winfield
  • R Wood
  • P Woods
  • A Yeremin
چکیده

The β-delayed neutron emission probabilities of neutron rich Hg and Tl nuclei have been measured together with β-decay half-lives for 20 isotopes of Au, Hg, Tl, Pb, and Bi in the mass region N≳126. These are the heaviest species where neutron emission has been observed so far. These measurements provide key information to evaluate the performance of nuclear microscopic and phenomenological models in reproducing the high-energy part of the β-decay strength distribution. This provides important constraints on global theoretical models currently used in r-process nucleosynthesis.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Impact of the first - forbidden β decay on the production of A ∼ 195 r - process peak

Impact of the first-forbidden β decay on the production of A ∼ 195 r-process peak a r t i c l e i n f o a b s t r a c t First-forbidden transition Neutron emission QRPA We investigated the effects of first-forbidden transitions in β decays on the production of the r-process A ∼ 195 peak. The theoretical calculated β-decay rates with β-delayed neutron emission were examined using several astroph...

متن کامل

- th / 0 40 90 19 v 1 9 S ep 2 00 4 The β - delayed neutron emission in 78 Ni region

A systematic study of the total β-decay half-lives and β-delayed neutron emission probabilities is performed. The β-strength function is treated within the self-consistent density-functional + continuum-QRPA framework including the Gamow-Teller and first-forbidden transitions. The experimental total β-decay half-lives for the Ni isotopes with A ≤76 are described satisfactorily. The half-lives p...

متن کامل

MEASUREMENT OF D2O IN WATER USING 2H(?,n)1H REACTION

Utilization of Photodisintegration reaction of Deuterium, 2H(?,n)1H, is a precise technique for determining the percentage of 2H in tritiated and natural water. The 23Na(n,?)24Na reaction is a suitable ?-source for producing the 2H(?,n)1H reaction. Tehran Research Reactor was used as a neutron source for producing 24Na isotopes. The BF3 detectors were used to detect the neutron emission of H2 c...

متن کامل

Charge radius isotope shift across the N=126 shell gap.

We revisit the problem of the kink in the charge radius shift of neutron-rich even isotopes near the N=126 shell closure. We show that the ability of a Skyrme force to reproduce the isotope shift is determined by the occupation of the neutron 1i(11/2) orbital beyond N=126 and the corresponding change it causes to deeply-bound protons orbitals with a principal quantum number of 1. Given the obse...

متن کامل

Isomers in neutron - rich lead isotopes populated via the fragmentation of 238 U at 1 GeV A

Neutron-rich nuclei beyond N = 126 in the lead region were populated by fragmenting a U beam at 1 GeV A on a Be target and then separated by the Fragment Separator (FRS) at GSI. Their isomeric decays were observed, enabling study of the shell structure of neutron-rich nuclei around the Z=82 shell closure. Some preliminary results are reported in this paper.

متن کامل

ذخیره در منابع من

ذخیره در منابع من قبلا به منابع من ذحیره شده

{@ msg_add @}


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Physical review letters

دوره 117 1  شماره 

صفحات  -

تاریخ انتشار 2016