Register to reply

Radio activity

by assassinsdoc
Tags: activity, radio
Share this thread:
assassinsdoc
#1
Oct31-13, 08:19 AM
P: 7
Why c - 14 is radio active though n/p ratio is less than 1.5?
Phys.Org News Partner Physics news on Phys.org
Step lightly: All-optical transistor triggered by single photon promises advances in quantum applications
The unifying framework of symmetry reveals properties of a broad range of physical systems
What time is it in the universe?
UltrafastPED
#2
Oct31-13, 09:26 AM
Sci Advisor
Thanks
PF Gold
UltrafastPED's Avatar
P: 1,908
There is no "magic rule"; see the article on "nuclear drip line": http://en.wikipedia.org/wiki/Nuclear_drip_line
dauto
#3
Oct31-13, 10:10 AM
Thanks
P: 1,948
That is not a rule. Most radioactive elements do not have n/p > 1.5. That's a myth

dauto
#4
Oct31-13, 10:17 AM
Thanks
P: 1,948
Radio activity

Do not confuse the statement "There are no stable nuclei with n/p > 1.5" with the statement "All unstable nuclei have n/p > 1.5". See the difference? The first one is true. The second one most definitely isn't.
mfb
#5
Oct31-13, 06:43 PM
Mentor
P: 11,900
Quote Quote by dauto View Post
Do not confuse the statement "There are no stable nuclei with n/p > 1.5" with the statement "All unstable nuclei have n/p > 1.5". See the difference? The first one is true. The second one most definitely isn't.
Lead-207 is (experimentally1) stable with 82 protons and 125 neutrons, 125/82=1.524.
There are a few other examples, see the linked list.
dauto
#6
Nov1-13, 09:23 AM
Thanks
P: 1,948
Quote Quote by mfb View Post
Lead-207 is (experimentally1) stable with 82 protons and 125 neutrons, 125/82=1.524.
There are a few other examples, see the linked list.
That's exactly my point. This rule is just an approximate rule of thumb...
assassinsdoc
#7
Nov6-13, 07:47 AM
P: 7
thank you!
I've studied in class about something called 'magic numbers' where nuclei having 2, 8, 20, 28, 50, 82 or 126 protons or neutrons or both (seperately) are exceptionally stable compared to their respective neighbouring nuclides. So, they too make an exception.
mfb
#8
Nov6-13, 08:21 AM
Mentor
P: 11,900
That's right.


Register to reply

Related Discussions
What has radio got to do with this activity? High Energy, Nuclear, Particle Physics 7
Radio activity Introductory Physics Homework 7
Nuclear physics and radio activity Introductory Physics Homework 1
Radio activity lab suggestions High Energy, Nuclear, Particle Physics 1
What is particle spin , and does it have anything to do with radio activity? General Physics 5